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Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Electrode material comprising graphene-composite materials in a graphite network  

DOE Patents (OSTI)

A durable electrode material suitable for use in Li ion batteries is provided. The material is comprised of a continuous network of graphite regions integrated with, and in good electrical contact with a composite comprising graphene sheets and an electrically active material, such as silicon, wherein the electrically active material is dispersed between, and supported by, the graphene sheets.

Kung, Harold H.; Lee, Jung K.

2014-07-15T23:59:59.000Z

2

XG Sciences, ORNL partner on titanium-graphene composite materials...  

NLE Websites -- All DOE Office Websites (Extended Search)

XG Sciences, ORNL partner on titaniumgraphene composite materials January 01, 2013 Titaniumgraphene composite specimens prepared for flash thermal diffusivity measurement....

3

In situ synthesis of SnO2 nanosheet/graphene composite as anode materials for lithium-ion batteries  

Science Journals Connector (OSTI)

A novel SnO2/graphene composite has been synthesized via an in...2 nanosheets are uniformly grown on graphene support. The as-prepared products were characterized ... used as an anode material for lithium ion batteries

Hongdong Liu; Jiamu Huang; Chengjie Xiang…

2013-10-01T23:59:59.000Z

4

Graphene-based composites as cathode materials for lithium ion batteries  

Science Journals Connector (OSTI)

Owing to the superior mechanical, thermal, and electrical properties, graphene was a perfect candidate to improve the performance of lithium ion batteries. Herein, we review the recent advances in graphene-based composites and their application as cathode ...

Libao Chen; Ming Zhang; Weifeng Wei

2013-01-01T23:59:59.000Z

5

A composite material of uniformly dispersed sulfur on reduced graphene oxide: Aqueous one-pot synthesis, characterization and excellent performance as the cathode in rechargeable lithium-sulfur batteries  

Science Journals Connector (OSTI)

Sulfur-reduced graphene oxide composite (SGC) materials with uniformly dispersed sulfur on reduced graphene oxide sheets have been prepared by a ... the simultaneous oxidation of sulfide and reduction of graphene

Hui Sun; Gui-Liang Xu; Yue-Feng Xu; Shi-Gang Sun; Xinfeng Zhang…

2012-10-01T23:59:59.000Z

6

Sn and SnO2-graphene composites as anode materials for lithium-ion batteries  

Science Journals Connector (OSTI)

Sn and SnO2-graphene composites were synthesized using hydrothermal process, followed by annealing in Ar/H2 atmosphere, and characterized using x-ray diffraction, scanning electron microscopy, and transition elec...

Qi-Hui Wu; Chundong Wang; Jian-Guo Ren

2013-12-01T23:59:59.000Z

7

One-Step Synthesis of Graphene/Polypyrrole Nanofiber Composites as Cathode Material for a Biocompatible Zinc/Polymer Battery  

Science Journals Connector (OSTI)

One-Step Synthesis of Graphene/Polypyrrole Nanofiber Composites as Cathode Material for a Biocompatible Zinc/Polymer Battery ... Miniature or flexible aqueous metal–air batteries are currently considered to be one of the most promising candidates for powering mIMDs, which mainly include the zinc–air battery system and the magnesium–air battery system. ...

Sha Li; Kewei Shu; Chen Zhao; Caiyun Wang; Zaiping Guo; Gordon Wallace; Hua Kun Liu

2014-09-08T23:59:59.000Z

8

Laterally confined graphene nanosheets and graphene/SnO2 composites as high-rate anode materials for lithium-ion batteries  

Science Journals Connector (OSTI)

High-rate anode materials for lithium-ion batteries are desirable for applications that require high ... demonstrate the advantageous rate capability of few-layered graphene nanosheets, with widths of 100–200 nm,...

Zhiyong Wang; Hao Zhang; Nan Li; Zujin Shi; Zhennan Gu; Gaoping Cao

2010-10-01T23:59:59.000Z

9

Graphene-Multilayer Graphene Nanocomposites as Highly Efficient Thermal Interface Materials  

E-Print Network (OSTI)

resistance at the graphene-matrix interface. KEYWORDS: Graphene, thermal interface materials, nanocompositesGraphene-Multilayer Graphene Nanocomposites as Highly Efficient Thermal Interface Materials Khan M suggest that graphene-multilayer graphene nanocomposite used as the thermal interface material outperforms

10

Graphene sheets decorated with ZnO nanoparticles as anode materials for lithium ion batteries  

Science Journals Connector (OSTI)

ZnO/graphene composites were synthesized using a facile solution- ... 4 nm were densely and homogeneously deposited on graphene sheets. As the anode material for the lithium ion batteries, the ZnO/graphene compos...

Ling-Li Xu; Shao-Wei Bian; Kang-Lin Song

2014-09-01T23:59:59.000Z

11

Tin oxide-titanium oxide/graphene composited as anode materials for lithium-ion batteries  

Science Journals Connector (OSTI)

A tin oxide-titanium oxide/graphene (SnO2-TiO2.../G) ternary nanocomposite as high-performance anode for Li-ion batteries was prepared via a simple reflux method. ... The graphite oxide (GO) was reduced to graphene

Shan-Shan Chen; Xue Qin

2014-10-01T23:59:59.000Z

12

Developing Functionalized Graphene Materials for Biomass Conversion...  

NLE Websites -- All DOE Office Websites (Extended Search)

Developing Functionalized Graphene Materials for Biomass Conversion The goal of this research is to develop low cost catalysts based on graphene-derived nanomaterials, and use them...

13

Processable Conducting Polyaniline, Carbon Nanotubes, Graphene and Their Composites  

E-Print Network (OSTI)

Polyaniline, Carbon Nanotubes, Graphene and Their CompositesPolyaniline, Carbon Nanotubes, Graphene and Their Compositespolyaniline (PANI), carbon nanotubes (CNTs) and graphene.

Wang, Kan

2014-01-01T23:59:59.000Z

14

Enhanced optical limiting effects of graphene materials in polyimide  

SciTech Connect

Three different graphene nanostructure suspensions of graphene oxide nanosheets (GONSs), graphene oxide nanoribbons (GONRs), and graphene oxide quantum dots (GOQDs) are prepared and characterized. Using a typical two-step method, the GONSs, GONRs, and GOQDs are incorporated into a polyimide (PI) matrix to synthesize graphene/PI composite films, whose nonlinear optical (NLO) and optical limiting (OL) properties are investigated at 532?nm in the nanosecond regime. The GONR suspension exhibits superior NLO and OL effects compared with those of GONSs and GOQDs because of its stronger nonlinear scattering and excited-state absorption. The graphene/PI composite films exhibit NLO and OL performance superior to that of their corresponding suspensions, which is attributed primarily to a combination of nonlinear mechanisms, charge transfer between graphene materials and PI, and the matrix effect.

Gan, Yao; Feng, Miao; Zhan, Hongbing, E-mail: hbzhan@fzu.edu.cn [College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108 (China)

2014-04-28T23:59:59.000Z

15

The effect of graphene nanosheets as an additive for anode materials in lithium ion batteries  

Science Journals Connector (OSTI)

A small amount of graphene nanosheets was added to commercial graphite as an anode active material in lithium ion batteries and its effects were examined through a ... composite electrode containing 1 or 5 wt% graphene

Jae Hun Jeong; Dong-Won Jung; Byung-Sun Kong…

2011-11-01T23:59:59.000Z

16

Effects of graphene on MoO2-MoS2 composite as anode material for lithium-ion batteries  

Science Journals Connector (OSTI)

The electrochemical properties of MoO2-MoS2/graphene electrode were compared with those of MoO2-MoS2, bulk MoS2, and graphene electrode. MoO2-MoS2 composite was prepared by a hydrothermal reaction of molybdenum (...

Moon-Jin Hwang; Kwang Man Kim; Kwang-Sun Ryu

2014-07-01T23:59:59.000Z

17

Synthesis of reduced graphene oxide/ZnO nanorods composites on graphene coated PET flexible substrates  

SciTech Connect

Graphical abstract: - Highlights: • ZnO nanorods synthesized on CVD-graphene and rGO surfaces, respectively. • ZnO/CVD-graphene and ZnO/rGO form a distinctive porous 3D structure. • rGO/ZnO nanostructures possibility in energy storage devices. - Abstract: In this work, reduced graphene oxide (rGO)/ZnO nanorods composites were synthesized on graphene coated PET flexible substrates. Both chemical vapor deposition (CVD) graphene and reduced graphene oxide (rGO) films were prepared following by hydrothermal growth of vertical aligned ZnO nanorods. Reduced graphene sheets were then spun coated on the ZnO materials to form a three dimensional (3D) porous nanostructure. The morphologies of the ZnO/CVD graphene and ZnO/rGO were investigated by SEM, which shows that the ZnO nanorods grown on rGO are larger in diameters and have lower density compared with those grown on CVD graphene substrate. As a result of fact, the rough surface of nano-scale ZnO on rGO film allows rGO droplets to seep into the large voids of ZnO nanorods, then to form the rGO/ZnO hierarchical structure. By comparison of the different results, we conclude that rGO/ZnO 3D nanostructure is more desirable for the application of energy storage devices.

Huang, Lei, E-mail: leihuang@shnu.edu.cn; Guo, Guilue; Liu, Yang; Chang, Quanhong; Shi, Wangzhou

2013-10-15T23:59:59.000Z

18

Poly(2,5-dimercapto-1,3,4-thiadiazole)/sulfonated graphene composite as cathode material for rechargeable lithium batteries  

Science Journals Connector (OSTI)

Poly(2,5-dimercapto-1,3,4-thiadiazole) (PDMcT)/sulfonated graphene conductive composite (PDMcT/SGS) was synthesized through in situ oxidative polymerization in the presence of the water-soluble sulfonated grap...

Lifeng Jin; Gengchao Wang; Xingwei Li; Liangbin Li

2011-04-01T23:59:59.000Z

19

Composites of Graphene and LiFePO4 as Cathode Materials for Lithium-Ion Battery: A Mini-review  

Science Journals Connector (OSTI)

This mini-review highlights selectively the recent research progress in the composites of LiFePO4 and graphene. In particularly, the different fabrication protocols, and the electrochemical performance of the com...

Haixia Wu; Qinjiao Liu; Shouwu Guo

2014-10-01T23:59:59.000Z

20

Nanocomposite of graphene and metal oxide materials  

SciTech Connect

Nanocomposite materials comprising a metal oxide bonded to at least one graphene material. The nanocomposite materials exhibit a specific capacity of at least twice that of the metal oxide material without the graphene at a charge/discharge rate greater than about 10C.

Liu, Jun; Aksay, Ilhan A.; Choi, Daiwon; Wang, Donghai; Yang, Zhenguo

2012-09-04T23:59:59.000Z

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

A Prototype for Graphene Material Simulation: Structures and...  

NLE Websites -- All DOE Office Websites (Extended Search)

Prototype for Graphene Material Simulation: Structures and Interaction Potentials ofCoronene Dimers. A Prototype for Graphene Material Simulation: Structures and Interaction...

22

Graphene modified Li2FeSiO4/C composite as a high performance cathode material for lithium-ion batteries  

Science Journals Connector (OSTI)

Graphene modified Li2FeSiO4/C composite (Li2FeSiO4/C/G) has been synthesized successfully by a chemical vapor deposition (CVD)-assisted two-step solid-state reactions. The Li2FeSiO4/C/G composite is characteristi...

Zheng Zhang; Xingquan Liu; Yue Wu; Hongyuan Zhao

2014-09-01T23:59:59.000Z

23

Materials: Graphene can desalinate water  

Science Journals Connector (OSTI)

... Graphene promises to be many times more permeable to water than conventional membranes used in desalination, the authors say. ...

2012-06-20T23:59:59.000Z

24

Graphene-based structure, method of suspending graphene membrane, and method of depositing material onto graphene membrane  

DOE Patents (OSTI)

An embodiment of a method of suspending a graphene membrane across a gap in a support structure includes attaching graphene to a substrate. A pre-fabricated support structure having the gap is attached to the graphene. The graphene and the pre-fabricated support structure are then separated from the substrate which leaves the graphene membrane suspended across the gap in the pre-fabricated support structure. An embodiment of a method of depositing material includes placing a support structure having a graphene membrane suspended across a gap under vacuum. A precursor is adsorbed to a surface of the graphene membrane. A portion of the graphene membrane is exposed to a focused electron beam which deposits a material from the precursor onto the graphene membrane. An embodiment of a graphene-based structure includes a support structure having a gap, a graphene membrane suspended across the gap, and a material deposited in a pattern on the graphene membrane.

Zettl, Alexander K.; Meyer, Jannik Christian

2013-04-02T23:59:59.000Z

25

Nanorod-like Fe2O3/graphene composite as a high-performance anode material for lithium ion batteries  

Science Journals Connector (OSTI)

In this study, a nanorod-like Fe2O3/graphene nanocomposite is synthesized by a facile template-free hydrothermal method and a following calcination in air at 300 °C for 2 h. The Fe2O3 nanorods with diameter of 15...

Bing Zhao; Ruizhe Liu; Xinhui Cai; Zheng Jiao…

2014-01-01T23:59:59.000Z

26

Graphene for reducing bubble defects and enhancing mechanical properties of graphene/cellulose acetate composite films  

Science Journals Connector (OSTI)

In this study, we have demonstrated a strategy by which graphene was used to reduce the bubble defects and enhance the mechanical properties in graphene/cellulose acetate (Gr/CA) composite films. Mono- and multil...

Lei Liu; Zhigang Shen; Shuaishuai Liang; Min Yi…

2014-01-01T23:59:59.000Z

27

Graphene Oxides Dispersing and Hosting Graphene Sheets for Unique Nanocomposite Materials  

Science Journals Connector (OSTI)

Graphene Oxides Dispersing and Hosting Graphene Sheets for Unique Nanocomposite Materials ... Graphene oxides (GOs), beyond their widely reported use as precursors for single-layer graphene sheets, are in fact excellent materials themselves (polymers in two-dimension, polyelectrolyte-like, aqueous solubility and biocompatibility, etc.). ... In this reported work we used aqueous GOs to effectively disperse few-layer graphene sheets (GNs) in suspension for facile wet-processing into nanocomposites of GNs embedded in GOs (as the polymeric matrix). ...

Leilei Tian; Parambath Anilkumar; Li Cao; Chang Yi Kong; Mohammed J. Meziani; Haijun Qian; L. Monica Veca; Tim J. Thorne; Kenneth N. Tackett; II; Travis Edwards; Ya-Ping Sun

2011-03-16T23:59:59.000Z

28

CuGeO3 nanowires covered with graphene as anode materials of lithium ion batteries with enhanced  

E-Print Network (OSTI)

CuGeO3 nanowires covered with graphene as anode materials of lithium ion batteries with enhanced one-step route was developed to synthesize crystalline CuGeO3 nanowire/graphene composites (CGCs). Crystalline CuGeO3 nanowires were tightly covered and anchored by graphene sheets, forming a layered structure

Lin, Zhiqun

29

Cobalt oxide–graphene nanocomposite as anode materials for lithium-ion batteries  

Science Journals Connector (OSTI)

Composites of Co3O4/graphene nanosheets are prepared and characterized by X- ... behavior as anode materials of lithium-ion rechargeable batteries is investigated by galvanostatic discharge/charge measurements...

Guiling Wang; Jincheng Liu; Sheng Tang…

2011-12-01T23:59:59.000Z

30

Hydrogen Bond Networks in Graphene Oxide Composite Paper: Structure and  

E-Print Network (OSTI)

a precur- sor for graphene, GO itself can be useful in flexible electronics,7 in battery electrodes,8Hydrogen Bond Networks in Graphene Oxide Composite Paper: Structure and Mechanical Properties Engineering, University of Texas, Austin, Texas 78712 I n recent years, grapheneOa single layer of carbon

31

Graphene: from materials science to particle physics  

E-Print Network (OSTI)

Since its discovery in 2004, graphene, a two-dimensional hexagonal carbon allotrope, has generated great interest and spurred research activity from materials science to particle physics and vice versa. In particular, graphene has been found to exhibit outstanding electronic and mechanical properties, as well as an unusual low-energy spectrum of Dirac quasiparticles giving rise to a fractional quantum Hall effect when freely suspended and immersed in a magnetic field. One of the most intriguing puzzles of graphene involves the low-temperature conductivity at zero density, a central issue in the design of graphene-based nanoelectronic components. While suspended graphene experiments have shown a trend reminiscent of semiconductors, with rising resistivity at low temperatures, most theories predict a constant or even decreasing resistivity. However, lattice field theory calculations have revealed that suspended graphene is at or near the critical coupling for excitonic gap formation due to strong Coulomb interactions, which suggests a simple and straightforward explanation for the experimental data. In this contribution we review the current status of the field with emphasis on the issue of gap formation, and outline recent progress and future points of contact between condensed matter physics and Lattice QCD.

Joaquín E. Drut; Timo A. Lähde; Eero Tölö

2010-11-02T23:59:59.000Z

32

Synthesis of graphene oxide nanosheet: A novel glucose sensor based on nickel-graphene oxide composite film  

Science Journals Connector (OSTI)

The graphene oxide (GO) nanosheets were produced by ... IR). An electrochemical sensor based on Ni/graphene (GR) composite film was developed by...2+ into the graphene oxide film modified glassy carbon electrode ...

Fereshteh Chekin; Samira Bagheri…

2014-11-01T23:59:59.000Z

33

SciTech Connect: Graphene-Au Nanoparticles Composite-Based Electrochem...  

Office of Scientific and Technical Information (OSTI)

Conference: Graphene-Au Nanoparticles Composite-Based Electrochemical Aptamer Biosensors Citation Details In-Document Search Title: Graphene-Au Nanoparticles Composite-Based...

34

Graphene oxide-based materials : synthesis, characterization and applications.  

E-Print Network (OSTI)

??In this study, the properties and applications of graphene oxide-based materials have been explored. Specifically, graphene oxide, i.e. a single layer of graphite oxide, reduced… (more)

Zhou, Xiaozhu.

2010-01-01T23:59:59.000Z

35

Vorbeck Materials Licenses Graphene-based Battery Technologies...  

NLE Websites -- All DOE Office Websites (Extended Search)

America Energy Storage Energy Storage Return to Search Vorbeck Materials Licenses Graphene-based Battery Technologies Pacific Northwest National Laboratory Testing materials in...

36

Graphene-Wrapped Sulfur Particles as a Rechargeable Lithium–Sulfur Battery Cathode Material with High Capacity and Cycling Stability  

Science Journals Connector (OSTI)

Graphene-Wrapped Sulfur Particles as a Rechargeable Lithium–Sulfur Battery Cathode Material with High Capacity and Cycling Stability ... The resulting graphene–sulfur composite showed high and stable specific capacities up to ?600 mAh/g over more than 100 cycles, representing a promising cathode material for rechargeable lithium batteries with high energy density. ...

Hailiang Wang; Yuan Yang; Yongye Liang; Joshua Tucker Robinson; Yanguang Li; Ariel Jackson; Yi Cui; Hongjie Dai

2011-06-24T23:59:59.000Z

37

Graphene materials having randomly distributed two-dimensional structural defects  

SciTech Connect

Graphene-based storage materials for high-power battery applications are provided. The storage materials are composed of vertical stacks of graphene sheets and have reduced resistance for Li ion transport. This reduced resistance is achieved by incorporating a random distribution of structural defects into the stacked graphene sheets, whereby the structural defects facilitate the diffusion of Li ions into the interior of the storage materials.

2013-10-08T23:59:59.000Z

38

Electrically conductive composite material  

DOE Patents (OSTI)

An electrically conductive composite material is disclosed which comprises a conductive open-celled, low density, microcellular carbon foam filled with a non-conductive polymer or resin. The composite material is prepared in a two-step process consisting of first preparing the microcellular carbon foam from a carbonizable polymer or copolymer using a phase separation process, then filling the carbon foam with the desired non-conductive polymer or resin. The electrically conductive composites of the present invention has a uniform and consistent pattern of filler distribution, and as a result is superior over prior art materials when used in battery components, electrodes, and the like. 2 figs.

Clough, R.L.; Sylwester, A.P.

1989-05-23T23:59:59.000Z

39

Short courses in Composite Materials  

E-Print Network (OSTI)

Short courses in Composite Materials Overview The ability to tailor the material properties used. Combining the adaptability of composites with clear weight savings, whilst tailoring materials properties Airbus and Glyndr University, the Advanced Composites Training and Development Centre educates current

Davies, John N.

40

New Composite Silicon-Defect Graphene Anode Architecture  

NLE Websites -- All DOE Office Websites (Extended Search)

A New Composite Silicon-Defect Graphene Anode Architecture for High Capacity, High-Rate Li-ion Batteries Xin Zhao, Cary Hayner, Mayfair Kung, and Harold Kung, Northwestern...

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Functionalized graphene aerogel composites for high-performance asymmetric supercapacitors  

Science Journals Connector (OSTI)

Abstract Asymmetric supercapacitors (ASCs) have played a leading role in realizing energy storage devices with high energy and power densities. While both anode and cathode materials are important for high performance ASCs, more research effort has been devoted to developing cathode materials because the energy source of an ASC is mostly attributed to the cathode. However, the development of anode materials is essential in order to achieve high power density as well as stable long-term cycle life of ASCs. In this study, functionalized graphene aerogel (GA) decorated with palladium (Pd) nanoparticles is used as an efficient ASC anode material. The high surface area (328 m2 g?1) and low electrical resistivity (50 times lower than one without Pd) of the GA composite grants a high specific capacitance (175.8 F g?1 at 5 mV s?1), excllent rate capability (48.3% retention after a 10 fold increase of scan rate), and remarkable reversibility. \\{ASCs\\} assembled from manganese dioxide (cathode) and GA composite (anode) show stable extended cell voltage, fast charge–discharge capability, excellent cycle stability (89.6% retention after 3000 cycles), and high energy and power densities (average of 13.9 W h kg?1 and 13.3 kW kg?1). These results demonstrate the great potential of the GA composite as an efficient anode material for high performance energy storage devices.

Zenan Yu; Matthew McInnis; Jean Calderon; Sudipta Seal; Lei Zhai; Jayan Thomas

2014-01-01T23:59:59.000Z

42

Sulfur/three-dimensional graphene composite for high performance lithium–sulfur batteries  

Science Journals Connector (OSTI)

Abstract A sulfur/graphene composite is prepared by loading elemental sulfur into three-dimensional graphene (3D graphene), which is assembled using a metal ions assisted hydrothermal method. When used as cathode materials for lithium–sulfur (Li–S) batteries, the sulfur/graphene composite (S@3D-graphene) with 73 wt % sulfur shows a significantly enhanced cycling performance (>700 mAh g?1 after 100 cycles at 0.1C rate with a Coulombic efficiency > 96%) as well as high rate capability with a capacity up to 500 mAh g?1 at 2C rate (3.35 A g?1). The superior electrochemical performance could be attributed to the highly porous structure of three-dimensional graphene that not only enables stable and continue pathway for rapid electron and ion transportation, but also restrain soluble polysulfides and suppress the “shuttle effect”. Moreover, the robust structure of 3D graphene can keep cathode integrity and accommodate the volume change during high-rate charge/discharge processes, making it a promising candidate as cathode for high performance Li–S batteries.

Chunmei Xu; Yishan Wu; Xuyang Zhao; Xiuli Wang; Gaohui Du; Jun Zhang; Jiangping Tu

2015-01-01T23:59:59.000Z

43

Vibrational Damping of Composite Materials  

E-Print Network (OSTI)

on the Damping of Composite Laminates”, SPIE Proceedings onpublication to Journal of Composite Materials Biggerstaff,submitted for publication to Composites, Part A Biggerstaff,

Biggerstaff, Janet M.

2006-01-01T23:59:59.000Z

44

TiO2/graphene composite from thermal reaction of graphene oxide and its photocatalytic activity in visible light  

Science Journals Connector (OSTI)

In this study, the P25 TiO2 nanoparticles and graphene sheets (GSs) composite were prepared from a facile thermal reaction of graphene oxide. Its microstructures and photocatalytic properties were ... nm in the a...

Yupeng Zhang; Chunxu Pan

2011-04-01T23:59:59.000Z

45

Nanostructured composite reinforced material  

DOE Patents (OSTI)

A family of materials wherein nanostructures and/or nanotubes are incorporated into a multi-component material arrangement, such as a metallic or ceramic alloy or composite/aggregate, producing a new material or metallic/ceramic alloy. The new material has significantly increased strength, up to several thousands of times normal and perhaps substantially more, as well as significantly decreased weight. The new materials may be manufactured into a component where the nanostructure or nanostructure reinforcement is incorporated into the bulk and/or matrix material, or as a coating where the nanostructure or nanostructure reinforcement is incorporated into the coating or surface of a "normal" substrate material. The nanostructures are incorporated into the material structure either randomly or aligned, within grains, or along or across grain boundaries.

Seals, Roland D. (Oak Ridge, TN); Ripley, Edward B. (Knoxville, TN); Ludtka, Gerard M. (Oak Ridge, TN)

2012-07-31T23:59:59.000Z

46

In situ fabrication and characterization of cobalt ferrite nanorods/graphene composites  

SciTech Connect

Cobalt ferrite nanorods/graphene composites were prepared by a one-step hydrothermal process using NaHSO{sub 3} as the reducing agent and 1-propyl-3-hexadecylimidazolium bromide as the structure growth-directing template. The reduction of graphene oxide and the in situ formation of cobalt ferrite nanorods were accomplished in a one-step reaction. The structure and morphology of as-obtained composites were characterized by field emission scanning electron microscopy, transmission electron microscopy, high resolution transmission electron microscopy, atomic force microscope, X-ray diffractometer, Fourier transform infrared spectra, X-ray photoelectron spectroscopy and Raman spectroscopy. Uniform rod-like cobalt ferrites with diameters of about 100 nm and length of about 800 nm were homogeneously distributed on the graphene sheets. The hybrid materials showed a saturation magnetization of 42.5 emu/g and coercivity of 495.1 Oe at room temperature. The electromagnetic parameters were measured using a vector network analyzer. A minimum reflection loss (RL) of ? 25.8 dB was observed at 16.1 GHz for the cobalt ferrite nanorods/graphene composites with a thickness of 2 mm, and the effective absorption frequency (RL < ? 10 dB) ranged from 13.5 to 18.0 GHz. The composites exhibited better absorbing properties than the cobalt ferrite nanorods and the mixture of cobalt ferrite nanorods and graphene. - Highlights: • Reduction of GO and formation of ferrites were accomplished in a one-step reaction. • Ionic liquid was used to control 1D growth of ferrite nanorods for the first time. • Cobalt ferrite nanorods/graphene composites showed dielectric and magnetic loss. • Cobalt ferrite nanorods/graphene composites exhibited better absorbing properties.

Fu, Min; Jiao, Qingze; Zhao, Yun, E-mail: zhaoyun@bit.edu.cn

2013-12-15T23:59:59.000Z

47

Fabrication of graphene-encapsulated CoO/CoFe2O4 composites derived from layered double hydroxides and their application as anode materials for lithium-ion batteries  

Science Journals Connector (OSTI)

Bicomponent CoO/CoFe2O4 composites with tunable particle sizes are prepared using Co–Fe layered double hydroxides (LDHs) or Co–Fe hydroxides as precursors. Moreover, graphene-encapsulated CoO/CoFe2O4 composites (...

Dejian Du; Wenbo Yue; Yu Ren; Xiaojing Yang

2014-12-01T23:59:59.000Z

48

Graphene-based Materials for Biosensing and Bioimaging  

SciTech Connect

Graphene, a free-standing two-dimensional crystal with one-atom thickness, exhibits distinct properties that are highly attractive for biosensing and bioimaging, such as a high electrical conductivity, a large planar area, and an excellent ability to quench fluorescence. This article selectively reviews recent advances in the field of graphene-based materials for biosensing and bioimaging. In particular, graphene-based enzyme biosensors, DNA biosensors, and immunosensors are summarized in detail. Graphene-based biotechnology for cell imaging is also described. Future perspectives and possible challenges in this rapidly developing area are also discussed.

Du, Dan; Yang, Yuqi; Lin, Yuehe

2012-12-01T23:59:59.000Z

49

Graphene-Based Composite Anodes for Lithium-Ion Batteries  

Science Journals Connector (OSTI)

Graphene has emerged as a novel, highly promising ... . As an anode material for lithium-ion batteries, it was shown that it cannot be ... cycling that leads to the failure of the batteries. To resolve this probl...

Nathalie Lavoie; Fabrice M. Courtel…

2013-01-01T23:59:59.000Z

50

SeZnSb alloy and its nano tubes, graphene composites properties  

SciTech Connect

Composite can alter the individual element physical property, could be useful to define the specific use of the material. Therefore, work demonstrates the synthesis of a new composition Se{sub 96}-Zn{sub 2}-Sb{sub 2} and its composites with 0.05% multi-walled carbon nano tubes and 0.05% bilayer graphene, in the glassy form. The diffused amorphous structure of the multi walled carbon nano tubes and bilayer gaphene in the Se{sub 96}-Zn{sub 2}-Sb{sub 2} alloy have been analyzed by using the Raman, X-ray photoluminescence spectroscopy, Furrier transmission infrared spectra, photoluminescence, UV/visible absorption spectroscopic measurements. The diffused prime Raman bands (G and D) have been appeared for the multi walled carbon nano tubes and graphene composites, while the X-ray photoluminescence core energy levels peak shifts have been observed for the composite materials. Subsequently the photoluminescence property at room temperature and a drastic enhancement (upto 80%) in infrared transmission percentage has been obtained for the bilayer graphene composite, along with optical energy band gaps for these materials have been evaluated 1.37, 1.39 and 1.41 eV.

Singh, Abhay Kumar [Department of Physics, Indian Institute of Physics, Bangalore-560012 (India)

2013-04-15T23:59:59.000Z

51

Graphene forms template for two-dimensional hybrid materials...  

NLE Websites -- All DOE Office Websites (Extended Search)

Graphene forms template for two-dimensional hybrid materials January 17, 2014 Researchers have developed a new technique for forming a two-dimensional, single-atom sheet of two...

52

Defects and impurities in graphene-like materials  

E-Print Network (OSTI)

Graphene-like materials could be used in the fabrication of electronic and optoelectronic devices, gas sensors, biosensors, and batteries for energy storage. Since it is almost impossible to work with defect-free or ...

Terrones, Mauricio

53

Graphene-based Material Systems for Nanoelectronics and Energy Storage Devices  

E-Print Network (OSTI)

Graphene photonics and optoelectronics" Nature PhotonicsFilm Electronics and Optoelectronics" Advanced MaterialsFilm Electronics and Optoelectronics" Advanced Materials

Guo, Shirui

2012-01-01T23:59:59.000Z

54

Graphene: Amazing Material Found Thanks to Scotch Tape and Persistent  

Office of Science (SC) Website

1 » Graphene: 1 » Graphene: Amazing Material Found Thanks to Scotch Tape and Persistent Science News Featured Articles 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 Science Headlines Presentations & Testimony News Archives Contact Information Office of Science U.S. Department of Energy 1000 Independence Ave., SW Washington, DC 20585 P: (202) 586-5430 03.25.11 Graphene: Amazing Material Found Thanks to Scotch Tape and Persistent Science What do you get when you combine pencil lead, scotch tape, and persistent science? A Nobel Prize . . . and a new world of potential applications. Print Text Size: A A A Subscribe FeedbackShare Page That's the developing story of graphene, an amazing material that can be found in pencil lead. Pencil "lead" is actually a mixture of clay and the

55

Enhancing electrochemical performance of LiFePO4 by in situ reducing flexible graphene  

Science Journals Connector (OSTI)

Well-dispersed graphene materials reduced by Ac under hydrothermal condition...4 battery materials, which was synthesized at surface of graphene sheets. The as-prepared LiFePO4/graphene composites were characteri...

Lianhong Zhang; Hongyu Liang

2013-10-01T23:59:59.000Z

56

Influence of Electrolyte Composition on Liquid-Gated Carbon Nanotube and Graphene Transistors  

E-Print Network (OSTI)

Influence of Electrolyte Composition on Liquid-Gated Carbon Nanotube and Graphene Transistors Iddo-walled carbon nanotubes (SWNTs) and graphene can function as highly sensitive nanoscale (bio)sensors in solution. Here, we compare experimentally how SWNT and graphene transistors respond to changes in the composition

Dekker, Cees

57

Reduced graphene oxide/porous Si composite as anode for high-performance lithium ion batteries  

Science Journals Connector (OSTI)

Reduced graphene oxide/porous Si composite was fabricated through ... subsequent dispersing porous Si in the suspension of graphene oxide followed by reduced process. The electrochemical performance of the obtain...

Hua-Chao Tao; Xue-Lin Yang; Lu-Lu Zhang; Shi-Bing Ni

2014-08-01T23:59:59.000Z

58

Three-dimensional graphene/LiFePO{sub 4} nanostructures as cathode materials for flexible lithium-ion batteries  

SciTech Connect

Graphical abstract: Graphene/LiFePO{sub 4} composites as a high-performance cathode material for flexible lithium-ion batteries have been prepared by using a co-precipitation method to synthesize graphene/LiFePO4 powders as precursors and then followed by a solvent evaporation process. - Highlights: • Flexible LiFePO{sub 4}/graphene films were prepared first time by a solvent evaporation process. • The flexible electrode exhibited a high discharge capacity without conductive additives. • Graphene network offers the electrode adequate strength to withstand repeated flexing. - Abstract: Three-dimensional graphene/LiFePO{sub 4} nanostructures for flexible lithium-ion batteries were successfully prepared by solvent evaporation method. Structural characteristics of flexible electrodes were investigated by X-ray diffraction (XRD), atomic force microscopy (AFM) and scanning electron microscopy (SEM). Electrochemical performance of graphene/LiFePO{sub 4} was examined by a variety of electrochemical testing techniques. The graphene/LiFePO{sub 4} nanostructures showed high electrochemical properties and significant flexibility. The composites with low graphene content exhibited a high capacity of 163.7 mAh g{sup ?1} at 0.1 C and 114 mAh g{sup ?1} at 5 C without further incorporation of conductive agents.

Ding, Y.H., E-mail: yhding@xtu.edu.cn [College of Chemical Engineering, Xiangtan University, Hunan 411105 (China); Institute of Rheology Mechanics, Xiangtan University, Hunan 411105 (China); Ren, H.M. [Institute of Rheology Mechanics, Xiangtan University, Hunan 411105 (China); Huang, Y.Y. [BTR New Energy Materials Inc., Shenzhen 518000 (China); Chang, F.H.; Zhang, P. [Institute of Rheology Mechanics, Xiangtan University, Hunan 411105 (China)

2013-10-15T23:59:59.000Z

59

Processable Conducting Polyaniline, Carbon Nanotubes, Graphene and Their Composites  

E-Print Network (OSTI)

Chapter 5 Solvothermal Reduced Graphene Oxide Dispersionsin Organic Solvents Graphene is a single-atom-thick sheet of5 Solvothermal Reduced Graphene Oxide Dispersions in Organic

Wang, Kan

2014-01-01T23:59:59.000Z

60

Graphene oxide/hydroxyapatite composite coatings fabricated by electrophoretic nanotechnology for  

E-Print Network (OSTI)

Graphene oxide/hydroxyapatite composite coatings fabricated by electrophoretic nanotechnology April 2013 Accepted 27 September 2013 Available online 8 October 2013 A B S T R A C T Graphene oxide (GO and uncoated Ti substrate. Ã? 2013 Elsevier Ltd. All rights reserved. 1. Introduction Graphene oxide (GO

Zheng, Yufeng

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Composite materials with integrated embedded sensing networks  

E-Print Network (OSTI)

Interlaminar Response of Composite Materials , ed. N. J.in fibre-reinforced composite structures with embedded fibreDutton, and D. Kelly. 2004. Composite Materials for Aircraft

Schaaf, Kristin Leigh

2008-01-01T23:59:59.000Z

62

Thermal Transformation of Carbon Hybrid Materials to Graphene Films  

Science Journals Connector (OSTI)

Thermal Transformation of Carbon Hybrid Materials to Graphene Films ... This study was supported in part by a grant of Support Program for Forming Strategic Research Infrastructure for Private Universities and KAKENHI (23651098) from Ministry of Education, Culture, Sport, Science and Technology, Japan (MEXT). ...

Rajanish N. Tiwari; M. Ishihara; Jitendra N. Tiwari; Masamichi Yoshimura

2013-06-18T23:59:59.000Z

63

Graphene-enhanced hybrid phase change materials for thermal management of Li-ion batteries  

E-Print Network (OSTI)

Graphene-enhanced hybrid phase change materials for thermal management of Li-ion batteries incorporation leads to significant decrease in the temperature rise in Li-ion batteries. Graphene leads September 2013 Keywords: Battery Thermal management Graphene Phase change material a b s t r a c t Li

64

Three-dimensionally macroporous graphene-supported Fe3O4 composite as anode material for Li-ion batteries with long cycling life and ultrahigh rate capability  

Science Journals Connector (OSTI)

Fe3O4 is an attractive conversion reaction-based anode material with high theoretical capacity (928 mA h g?1...). However, the poor cycling and rate performance hinder its applications in Li-ion batteries. In thi...

Delong Ma; Shuang Yuan; Zhanyi Cao

2014-06-01T23:59:59.000Z

65

On the material geometry of continuously defective corrugated graphene sheets  

E-Print Network (OSTI)

Geometrical objects describing the material geometry of continuously defective graphene sheets are introduced and their compatibility conditions are formulated. Effective edge dislocations embedded in the Riemann-Cartan material space and defined by their scalar density and by local Burgers vectors, are considered. The case of secondary curvature-type defects created by this distribution of dislocations is analysed in terms of the material space. The variational geometry of the material space closely related with the existence of a characteristic length parameter is proposed. The formula which describes, in a reference temperature, the influence of dislocations on the material Riemannian metric, is given.

Andrzej Trzesowski

2014-07-05T23:59:59.000Z

66

Materials - Recycling - Polymer Matrix Composites  

NLE Websites -- All DOE Office Websites (Extended Search)

Recycling of Polymer Matrix Composites Recycling of Polymer Matrix Composites Polymer matrix composites Carbon fibers recovered from a epoxy-based polymer matrix composite. Carbon fiber reinforced polymer matrix composites (PMCs) are materials with superior strength-to-weight ratios. Finding increased applications in the aerospace industry, PMCs are now being evaluated for possible use in automobile construction. The materialÂ’s high cost, however, along with concerns about whether the PMCs will be recyclable when the vehicles reach the end of their useful lives, are barriers to its widespread use. With funding provided by the U.S. Department of EnergyÂ’s Vehicle Technologies Program (formerly called the Office of Advanced Transportation Technologies), Argonne is developing an efficient and cost-effective

67

Multiscale Modeling and Homogenization of Composite Materials  

E-Print Network (OSTI)

Schematics of fiber composite . . . . . . . . . .of long fiber sic/ti composite materials. Comput. Methodsof Fibre-reinforced composites. Wiley, 4th edition, 2002. [

Mseis, George

2010-01-01T23:59:59.000Z

68

Stone-Wales defects in graphene and other planar sp2 -bonded materials  

E-Print Network (OSTI)

Stone-Wales defects in graphene and other planar sp2 -bonded materials Jie Ma,1,2,3 Dario Alfè,2 that the structure of the Stone-Wales SW defect in graphene is more complex than hitherto appreciated. Rather than of graphene and in so doing modify its chemical re- activity toward adsorbates, and likely impact upon its

Alfè, Dario

69

Graphene, a material for high temperature devices intrinsic carrier density, carrier  

E-Print Network (OSTI)

Graphene, a material for high temperature devices ­ intrinsic carrier density, carrier drift 3.87 3 106 cm22 K22 ?T2 ), carrier drift velocity, and G mode phonon energy of graphene devices and their temperature dependencies up to 2400 K. Our results show intrinsic carrier density of graphene is an order

Wang, Wei Hua

70

Graphene sheets fabricated from disposable paper cups as a catalyst support material for fuel cells  

E-Print Network (OSTI)

Graphene sheets fabricated from disposable paper cups as a catalyst support material for fuel cells Hong Zhao and T. S. Zhao* Disposable paper-cups are used for the formation of graphene sheets with Fe2+ as a catalyst. The proposed synthesis strategy not only enables graphene sheets to be produced in high yield

Zhao, Tianshou

71

Nanotube Composite Anode Materials | Argonne National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

Nanotube Composite Anode Materials Technology available for licensng: A composite material suitable for use in an anode for a lithium-ion battery Reduces manufacturing costs....

72

Cobalt Carbonate/ and Cobalt Oxide/Graphene Aerogel Composite Anodes for High Performance Li-Ion Batteries  

Science Journals Connector (OSTI)

Cobalt Carbonate/ and Cobalt Oxide/Graphene Aerogel Composite Anodes for High Performance Li-Ion Batteries ... (1, 2) Commercial LIBs use graphite as the anode material with a low theoretical specific capacity of 372 mAh g–1, necessitating extensive research to develop substitute anode materials with higher energy/power densities for high performance LIBs to satisfy demanding applications like electric vehicles. ...

Mohammad Akbari Garakani; Sara Abouali; Biao Zhang; Curtis Alton Takagi; Zheng-Long Xu; Jian-qiu Huang; Jiaqiang Huang; Jang-Kyo Kim

2014-10-15T23:59:59.000Z

73

Dense, finely, grained composite materials  

DOE Patents (OSTI)

Dense, finely grained composite materials comprising one or more ceramic phase or phase and one or more metallic and/or intermetallic phase or phases are produced by combustion synthesis. Spherical ceramic grains are homogeneously dispersed within the matrix. Methods are provided, which include the step of applying mechanical pressure during or immediately after ignition, by which the microstructures in the resulting composites can be controllably selected.

Dunmead, Stephen D. (Davis, CA); Holt, Joseph B. (San Jose, CA); Kingman, Donald D. (Danville, CA); Munir, Zuhair A. (Davis, CA)

1990-01-01T23:59:59.000Z

74

Graphene supported Li2SnO3 as anode material for lithium-ion batteries  

Science Journals Connector (OSTI)

The graphene supported Li2SnO3 composites were prepared via a deoxidation technique. The structure, morphology and electrochemical properties of the composites were detected by means of XRD, SEM, TEM, Raman, TGA ...

Yang Zhao; Ying Huang; Qiufen Wang; XiaoYa Wang; Meng Zong…

2013-09-01T23:59:59.000Z

75

Enhanced electrochemical performance by wrapping graphene on carbon nanotube/sulfur composites for rechargeable lithium–sulfur batteries  

Science Journals Connector (OSTI)

Abstract A novel graphene-wrapped carbon nanotube/sulfur structure was designed to improve the electrochemical performance of the lithium–sulfur (Li–S) batteries. Owing to the introduction of the reduced graphene oxide (rGO) with the aim to restrain the polysulfide anions diffusion phenomenon, increase the overall electronic conductivity of the electrode and accommodate volume expansion between the delithiated S and lithiated Li2S phases, the resulted graphene-wrapped carbon nanotube/sulfur (S/CNT@rGO) composite makes the cycling performance of the Li–S batteries better than that without rGO. The S/CNT@rGO composite showed an initial discharge capacity of ~1299 mA h g?1 at 0.2 C rate. After 100 cycles of charge/discharge, the S/CNT@rGO composite retained a high specific capacity of ~670 mA h g?1, much higher than that without rGO (graphene-wrapped carbon nanotube/sulfur composite could be a promising cathode material for high-rate performance Li–S batteries.

Yishan Wu; Chunmei Xu; Jinxin Guo; Qingmei Su; Gaohui Du; Jun Zhang

2014-01-01T23:59:59.000Z

76

The application of graphene in lithium ion battery electrode materials  

Science Journals Connector (OSTI)

Graphene is composed of a single atomic layer ... concept, structure, properties, preparation methods of graphene and its application in lithium ion batteries. A continuous 3D conductive network formed by graphene

Jiping Zhu; Rui Duan; Sheng Zhang; Nan Jiang; Yangyang Zhang; Jie Zhu

2014-10-01T23:59:59.000Z

77

A novel lithium/sulfur battery based on sulfur/graphene nanosheet composite cathode and gel polymer electrolyte  

Science Journals Connector (OSTI)

A novel sulfur/graphene nanosheet (S/GNS) composite was prepared ... ball milling of sulfur with commercial multi-layer graphene nanosheet, followed by a heat treatment. ... of irregularly interlaced nanosheet-li...

Yongguang Zhang; Yan Zhao; Zhumabay Bakenov

2014-03-01T23:59:59.000Z

78

A simple approach to synthesize nanosized sulfur/graphene oxide materials for high-performance lithium/sulfur batteries  

Science Journals Connector (OSTI)

We report on a simple and facile synthesis route for the sulfur/graphene oxide composite via ultrasonic mixing of the nano-sulfur and graphene oxide aqueous suspensions followed by a low-temperature heat treat...

Yongguang Zhang; Yan Zhao; Zhumabay Bakenov

2014-07-01T23:59:59.000Z

79

Heat insulation layer of polymer composite material  

Science Journals Connector (OSTI)

A new heat insulation layer polymer composite material is developed, within whose composition there is foam polyurethane and basaltoplastic. Results are provided for...

G. P. Ponomareva; A. A. Artemenko; O. M. Sladkov…

2010-05-01T23:59:59.000Z

80

Self assembled multi-layer nanocomposite of graphene and metal oxide materials  

DOE Patents (OSTI)

Nanocomposite materials having at least two layers, each layer consisting of one metal oxide bonded to at least one graphene layer were developed. The nanocomposite materials will typically have many alternating layers of metal oxides and graphene layers, bonded in a sandwich type construction and will be incorporated into an electrochemical or energy storage device.

Liu, Jun; Aksay, Ilhan A; Choi, Daiwon; Kou, Rong; Nie, Zimin; Wang, Donghai; Yang, Zhenguo

2013-10-22T23:59:59.000Z

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Self assembled multi-layer nanocomposite of graphene and metal oxide materials  

SciTech Connect

Nanocomposite materials having at least two layers, each layer consisting of one metal oxide bonded to at least one graphene layer were developed. The nanocomposite materials will typically have many alternating layers of metal oxides and graphene layers, bonded in a sandwich type construction and will be incorporated into an electrochemical or energy storage device.

Liu, Jun; Choi, Daiwon; Kou, Rong; Nie, Zimin; Wang, Donghai; Yang, Zhenguo

2014-09-16T23:59:59.000Z

82

Doped Graphene as a Material for Oxygen Reduction Reaction in Hydrogen Fuel Cells: A Computational Study  

E-Print Network (OSTI)

Doped Graphene as a Material for Oxygen Reduction Reaction in Hydrogen Fuel Cells: A Computational be used to make an efficient and relatively inexpensive graphene-based material for hydrogen fuel cells fuel cells for oxygen reduction at the cathode. In an attempt to find a cheap yet efficient catalyst

Krasheninnikov, Arkady V.

83

Paper-based ultracapacitors with carbon nanotubes-graphene composites  

SciTech Connect

In this paper, a paper-based ultracapacitors were fabricated by the rod-rolling method with the ink of carbon nanomaterials, which were synthesized by arc discharge under various magnetic conditions. Composites of carbon nanostructures, including high-purity single-walled carbon nanotubes (SWCNTs) and graphene flakes were synthesized simultaneously in a magnetically enhanced arc. These two nanostructures have promising electrical properties and synergistic effects in the application of ultracapacitors. Scanning electron microscope, transmission electron microscope, and Raman spectroscopy were employed to characterize the properties of carbon nanostructures and their thin films. The sheet resistance of the SWCNT and composite thin films was also evaluated by four-point probe from room temperature to the cryogenic temperature as low as 90?K. In addition, measurements of cyclic voltammetery and galvanostatic charging/discharging showed the ultracapacitor based on composites possessed a superior specific capacitance of up to 100?F/g, which is around three times higher than the ultracapacitor entirely fabricated with SWCNT.

Li, Jian, E-mail: lijian@gwu.edu, E-mail: keidar@gwu.edu; Cheng, Xiaoqian; Brand, Cameron; Shashurin, Alexey; Keidar, Michael, E-mail: lijian@gwu.edu, E-mail: keidar@gwu.edu [Department of Mechanical and Aerospace Engineering, The George Washington University, Washington, DC 20052 (United States); Sun, Jianwei; Reeves, Mark [Department of Physics, The George Washington University, Washington, DC 20052 (United States)

2014-04-28T23:59:59.000Z

84

Composite materials for fusion applications  

SciTech Connect

Ceramic matrix composites, CMCs, are being considered for advanced first-wall and blanket structural applications because of their high-temperature properties, low neutron activation, low density and low coefficient of expansion coupled with good thermal conductivity and corrosion behavior. This paper presents a review and analysis of the hermetic, thermal conductivity, corrosion, crack growth and radiation damage properties of CMCs. It was concluded that the leak rates of a gaseous coolant into the plasma chamber or tritium out of the blanket could exceed design criteria if matrix microcracking causes existing porosity to become interconnected. Thermal conductivities of unirradiated SiC/SiC and C/SiC materials are about 1/2 to 2/3 that of Type 316 SS whereas the thermal conductivity for C/C composites is seven times larger. The thermal stress figure-of-merit value for CMCs exceeds that of Type 316 SS for a single thermal cycle. SiC/SiC composites are very resistant to corrosion and are expected to be compatible with He or Li coolants if the O{sub 2} concentrations are maintained at the appropriate levels. CMCs exhibit subcritical crack growth at elevated temperatures and the crack velocity is a function of the corrosion conditions. The radiation stability of CMCs will depend on the stability of the fiber, microcracking of the matrix, and the effects of gaseous transmutation products on properties. 23 refs., 14 figs., 1 tab.

Jones, R.H.; Henager, C.H. Jr.; Hollenberg, G.W.

1991-10-01T23:59:59.000Z

85

VSe2/graphene nanocomposites as anode materials for lithium-ion batteries  

Science Journals Connector (OSTI)

Abstract Unprecedented VSe2/graphene nanocomposites are synthesized through a hydrothermal route. A large number of hexagonal \\{VSe2\\} sheets anchored on the graphene sheets can be observed. The thicknesses and lengths of \\{VSe2\\} sheets are controlled by graphene sheets. VSe2/graphene nanocomposite prepared with 15 mg graphite oxide (VSe2/G-15) exhibits the best electrochemical lithium storage properties such as charge/discharge capacities, cycle stability and rate capability when used as an anode material for lithium-ion batteries.

Yaping Wang; Binbin Qian; Huanhuan Li; Liang Liu; Long Chen; Haobin Jiang

2015-01-01T23:59:59.000Z

86

Mn3O4-Graphene Hybrid as a High-Capacity Anode Material for Lithium Ion Hailiang Wang,,  

E-Print Network (OSTI)

Mn3O4-Graphene Hybrid as a High-Capacity Anode Material for Lithium Ion Batteries Hailiang Wang hybrid materials of Mn3O4 nanoparticles on reduced graphene oxide (RGO) sheets for lithium ion battery-cost, and environ- mentally friendly anode for lithium ion batteries. Our growth-on- graphene approach should offer

Cui, Yi

87

Flower-like SnO2 nanoparticles grown on graphene as anode materials for lithium-ion batteries  

Science Journals Connector (OSTI)

Tin oxide (SnO2)/graphene composite was synthesized from SnCl2?·?2H2O and graphene oxide (GO) by a wet chemical-hydrothermal route. The GO was reduced to graphene nanosheet (GNS) and flower-like SnO2 nano-crystal...

Qi Guo; Xue Qin

2014-04-01T23:59:59.000Z

88

DOE Science Showcase - Graphene | OSTI, US Dept of Energy, Office...  

Office of Scientific and Technical Information (OSTI)

potential. Graphene has promising applications in many areas such as the development of solar cells, composite materials, lithium-ion batteries, biological and chemical sensors,...

89

Graphene Sheets Stabilized on Genetically Engineered M13 Viral Templates as Conducting Frameworks for Hybrid Energy-Storage Materials  

E-Print Network (OSTI)

Utilization of the material-specific peptide–substrate interactions of M13 virus broadens colloidal stability window of graphene. The homogeneous distribution of graphene is maintained in weak acids and increased ionic ...

Oh, Dahyun

90

http://jtc.sagepub.com Composite Materials  

E-Print Network (OSTI)

http://jtc.sagepub.com Composite Materials Journal of Thermoplastic DOI: 10.1177/0892705708089473 2008; 21; 209Journal of Thermoplastic Composite Materials Qinglin Wu Sun-Young Lee, In-Aeh Kang, Geum-Hyun Doh, Ho-Gyu Yoon, Byung-Dae Park and Acid Composites: Effect of Filler Content and Coupling Treatment

91

Sulfur nanocrystals anchored graphene composite with highly improved electrochemical performance for lithium–sulfur batteries  

Science Journals Connector (OSTI)

Abstract Two kinds of graphene–sulfur composites with 50 wt% of sulfur are prepared using hydrothermal method and thermal mixing, respectively. Transmission Electron Microscopy (TEM) and Energy Dispersive X-ray Spectra mapping show that sulfur nanocrystals with size of ?5 nm dispersed on graphene sheets homogeneously for the sample prepared by hydrothermal method (NanoS@G). While for the thermal mixed graphene–sulfur composite (S–G mixture), sulfur shows larger and uneven size (50–200 nm). X-ray Photoelectron Spectra (XPS) reveals the strong chemical bonding between the sulfur nanocrystals and graphene. Comparing with the S–G mixture, the NanoS@G composite shows highly improved electrochemical performance as cathode for lithium–sulfur (Li–S) battery. The NanoS@G composite delivers an initial capacity of 1400 mAh g?1 with the sulfur utilization of 83.7% at a current density of 335 mA g?1. The capacity keeps above 720 mAh g?1 over 100 cycles. The strong adherence of the sulfur nanocrystals on graphene immobilizes sulfur and polysulfides species and suppressed the “shuttle effect”, resulting higher coulombic efficiency and better capacity retention. Electrochemical impedance also suggests that the strong bonding enabled rapid electronic/ionic transport and improved electrochemical kinetics, therefore good rate capability is obtained. These results demonstrate that the NanoS@G composite is a very promising candidate for high-performance Li–S batteries.

Jun Zhang; Zimin Dong; Xiuli Wang; Xuyang Zhao; Jiangping Tu; Qingmei Su; Gaohui Du

2014-01-01T23:59:59.000Z

92

Nanoscale Graphene Disk: A Natural Functionally Graded Material --The Thermal Conductivity of Nanoscale Graphene Disk by Molecular Dynamics Simulation  

E-Print Network (OSTI)

In this letter, we investigate numerically (by non-equilibrium molecular dynamics) and analytically the thermal conductivity of nanoscale graphene disks (NGDs), and discussed the possibility to realize FGM with only one material, NGDs. We found that the NGD has a graded thermal conductivity and can be used as FGM in a large temperature range. Moreover, we show the dependent of NGDs' thermal conductivity on radius and temperature. Our study may inspire experimentalists to develop NGD based FGMs and help heat removal of hot spots on chips by graphene.

Yang, Nuo; Ma, Dengke; Lu, Tingyu; Li, Baowen

2014-01-01T23:59:59.000Z

93

Graphene-based functional materials for organic solar cells [Invited  

Science Journals Connector (OSTI)

Graphene is of great interest for future applications in organic photovoltaics (OPVs) due to its high three-dimensional aspect ratio, large specific surface area, remarkable optical...

Pan, Zhe; Gu, Huili; Wu, Meng-Ting; Li, Yongxi; Chen, Yu

2012-01-01T23:59:59.000Z

94

Graphene and Black Holes: novel materials to reach the unreachable  

E-Print Network (OSTI)

The case for a dedicated laboratory, to test hep-th models on analogue systems, is briefly made. The focus is on graphene.

Iorio, Alfredo

2014-01-01T23:59:59.000Z

95

Graphene and Black Holes: novel materials to reach the unreachable  

E-Print Network (OSTI)

The case for a dedicated laboratory, to test hep-th models on analogue systems, is briefly made. The focus is on graphene.

Alfredo Iorio

2014-12-15T23:59:59.000Z

96

TiO2/graphene nanocomposites as anode materials for high rate lithium-ion batteries  

Science Journals Connector (OSTI)

A simple strategy to prepare a hybrid of nanocomposites of anatase TiO2/graphene nanosheets (GNS) as anode materials for lithium-ion batteries was reported. The morphology and crystal structure...2/GNS electrode ...

Yi-ping Tang ???; Shi-ming Wang ???; Xiao-xu Tan ???…

2014-05-01T23:59:59.000Z

97

Composite materials in dynamic shipboard structural mounts  

E-Print Network (OSTI)

The purpose of this thesis is to investigate the viability of replacing traditional metal structural and machinery mounts with padding made of composite material. The two types of padding or isolation materials are represented ...

Faulk, Joanna (Joanna E.)

2011-01-01T23:59:59.000Z

98

Composite materials and method of making  

DOE Patents (OSTI)

A method for forming improved composite materials using a thermosetting polyester urethane hybrid resin, a closed cavity mold having an internal heat transfer mechanism used in this method, and the composite materials formed by this method having a hybrid of a carbon fiber layer and a fiberglass layer.

Simmons, Kevin L [Kennewick, WA; Wood, Geoffrey M [North Saanich, CA

2011-05-17T23:59:59.000Z

99

Micromechanical Damage Models for Continuous Fiber Reinforced Composite Materials  

E-Print Network (OSTI)

reinforced plastic matrix composite, Material and Design,1995). Failure of fiber composites: a lattice green functionreinforced titanium composites, Composites Science and

Wu, Yi

2013-01-01T23:59:59.000Z

100

Fabrication of Graphene Embedded LiFePO4 Using a Catalyst Assisted Self Assembly Method as a Cathode Material for High Power Lithium-Ion Batteries  

Science Journals Connector (OSTI)

Tailoring Crystal Structure and Morphology of LiFePO4/C Cathode Materials Synthesized by Heterogeneous Growth on Nanostructured LiFePO4 Seed Crystals ... Enhancement of Electrochemical Activity of LiFePO4 (olivine) by Amphiphilic Ru-bipyridine Complex Anchored to a Carbon Nanotube ... properties have also been investigated after assembling coin cells with the CA-graphene/LiFePO4 composite as a cathode active material. ...

WonKeun Kim; WonHee Ryu; DongWook Han; SungJin Lim; JiYong Eom; HyukSang Kwon

2014-03-12T23:59:59.000Z

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Combinatorial synthesis of inorganic or composite materials  

DOE Patents (OSTI)

Methods and apparatus for the preparation and use of a substrate having an array of diverse materials in predefined regions thereon. A substrate having an array of diverse materials thereon is generally prepared by delivering components of materials to predefined regions on a substrate, and simultaneously reacting the components to form at least two materials or, alternatively, allowing the components to interact to form at least two different materials. Materials which can be prepared using the methods and apparatus of the present invention include, for example, covalent network solids, ionic solids and molecular solids. More particularly, materials which can be prepared using the methods and apparatus of the present invention include, for example, inorganic materials, intermetallic materials, metal alloys, ceramic materials, organic materials, organometallic materials, nonbiological organic polymers, composite materials (e.g., inorganic composites, organic composites, or combinations thereof), etc. Once prepared, these materials can be screened for useful properties including, for example, electrical, thermal, mechanical, morphological, optical, magnetic, chemical, or other properties. Thus, the present invention provides methods for the parallel synthesis and analysis of novel materials having useful properties.

Goldwasser, Isy (Palo Alto, CA); Ross, Debra A. (Mountain Ranch, CA); Schultz, Peter G. (La Jolla, CA); Xiang, Xiao-Dong (Danville, CA); Briceno, Gabriel (Baldwin Park, CA); Sun, Xian-Dong (Fremont, CA); Wang, Kai-An (Cupertino, CA)

2010-08-03T23:59:59.000Z

102

SnO2-reduced graphene oxide nanoribbons as anodes for lithium ion batteries with enhanced cycling stability  

Science Journals Connector (OSTI)

A nanocomposite material of SnO2-reduced graphene oxide nanoribbons has been developed. In this composite, the reduced graphene oxide nanoribbons are uniformly coated by nanosized...2 that formed a thin layer of ...

Lei Li; Anton Kovalchuk; James M. Tour

2014-09-01T23:59:59.000Z

103

Pulsed laser deposited Si on multilayer graphene as anode material for lithium ion batteries  

Science Journals Connector (OSTI)

Pulsed laser deposition and chemical vapor deposition were used to deposit very thin silicon on multilayer graphene (MLG) on a nickel foam substrate for application as an anode material for lithium ion batteries. The as-grown material was directly fabricated into an anode without a binder and tested in a half-cell configuration. Even under stressful voltage limits that accelerate degradation the Si-MLG films displayed higher stability than Si-only electrodes. Post-cycling images of the anodes reveal the differences between the two material systems and emphasize the role of the graphene layers in improving adhesion and electrochemical stability of the Si.

Gouri Radhakrishnan; Brendan Foran; Michael V. Quinzio; Miles J. Brodie

2013-01-01T23:59:59.000Z

104

Dielectric and microwave attenuation properties of graphene nanoplatelet–epoxy composites  

SciTech Connect

Graphene nanoplatelet (GNP)–epoxy composites were fabricated for the investigation of the dielectric permittivity and microwave absorption in a frequency range from 8 to 20 GHz. The intrinsically conductive GNP particles and polarized interfacial centers in the composites contribute to the microwave absorption. A minimum reflection loss of ?14.5 dB at 18.9 GHz is observed for the GNP–epoxy composites with 15 wt. % GNP loading, which is mainly attributed to electric conductivity and the charge multipoles at the polarized interfaces in the GNP–epoxy composites.

Wang, Zhou; Luo, Jia; Zhao, Guang–Lin, E-mail: guang-lin-zhao@subr.edu [Department of Physics, Southern University and A and M college, Baton Rouge, LA 70813 (United States)] [Department of Physics, Southern University and A and M college, Baton Rouge, LA 70813 (United States)

2014-01-15T23:59:59.000Z

105

ENG 4793: Composite Materials and Processes 1 Compression Molding  

E-Print Network (OSTI)

1 ENG 4793: Composite Materials and Processes 1 Compression Molding ver 2 ENG 4793: Composite Materials and Processes 2 ENG 4793: Composite Materials and Processes 3 ENG 4793: Composite Materials and Processes 4 Schematic of a Compression Molding Press ENG 4793: Composite Materials and Processes 5 Matched

Colton, Jonathan S.

106

Polymer/Elastomer and Composite Material Science  

NLE Websites -- All DOE Office Websites (Extended Search)

/ Elastomer and / Elastomer and Composite Material Science KEVIN L. SIMMONS Pacific Northwest National Laboratory, Richland, WA DOE Headquarters, Forrestal Bldg. October 17-18, 2012 January 17, 2013 Kevin.simmons@pnnl.gov 1 Outline Hydrogen production, transmission, distribution, delivery system Common themes in the hydrogen system Automotive vs infrastructure Hydrogen use conditions Polymer/elastomer and composites compatibility? Common materials in BOP components, hoses, and liners Common materials in composite tank and piping Material issues Polymers/Elastomers Composites Questions 2 Main Points to Remember 1) Polymers are extensively used in hydrogen and fuel cell applications 2) Hydrogen impact on polymers is not well understood 3) Next steps 3 4 Hydrogen Production Systems

107

Polymer/Elastomer and Composite Material Science  

Energy.gov (U.S. Department of Energy (DOE))

Presentation by Kevin Simmons, Pacific Northwest National Laboratory, at the U.S. Department of Energy's Polymer and Composite Materials Meeting, held October 17-18, 2012, in Washington, D.C.

108

Mechanics Methodology for Textile Preform Composite Materials  

Science Journals Connector (OSTI)

NASA and its contractors have completed a program to develop a basic mechanics underpinning for textile composites. Three major deliverables were produced by the program: (1.) a set of test methods for measuring material properties and design allowables, ...

Jr Clarence C. Poe

1996-11-01T23:59:59.000Z

109

Materials compatibility issues for fabric composite radiators  

SciTech Connect

Short term materials compatibility tests have been completed on potential materials to be used in fabric composite radiators for space applications. Specific materials tested include copper, aluminum, titanium, FEP Teflon tubing, and three high strength fabric fibers: alumina-boria-silica, silicon carbide, and silicon dioxide. These materials have been exposed to pure water, methanol, and acetone for periods of time up to 5000 hours at variety of appropriate temperatures.

Marks, T.S.; Klein, A.C. (Department of Nuclear Engineering, Radiation Center, C116, Oregon State University, Corvallis, Oregon 97331-5902 (US))

1991-01-01T23:59:59.000Z

110

A silicon nanoparticle/reduced graphene oxide composite anode with excellent nanoparticle dispersion to improve lithium ion battery performance  

Science Journals Connector (OSTI)

Composite anodes of Si nanoparticles (SiNPs) and reduced graphene oxide (RGO) sheets with highly dispersed...+...electrochemistry by becoming highly involved in the charge–discharge reaction mechanisms as indicat...

Rhet C. de Guzman; Jinho Yang; Mark Ming-Cheng Cheng…

2013-07-01T23:59:59.000Z

111

ENG 4793: Composite Materials and Processes 1 Injection Molding  

E-Print Network (OSTI)

1 ENG 4793: Composite Materials and Processes 1 Injection Molding ver 1 ENG 4793: Composite · Ejection force · Design rules ENG 4793: Composite Materials and Processes 3 Equipment Clamp Mold Hopper Barrel ENG 4793: Composite Materials and Processes 4 Equipment ENG 4793: Composite Materials

Colton, Jonathan S.

112

Polymer Composites Research in the ALM Materials Program | Department...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

merit08warren2.pdf More Documents & Publications Polymer Composites Research in the LM Materials Program Overview Structural Automotive Components from Composite Materials...

113

Advanced Materials and Processing of Composites for High Volume...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Publications Advanced Materials and Processing of Composites for High Volume Applications Carbon Fiber SMC Advanced Materials and Processing of Composites for High Volume...

114

Graphene: A New Era of Technology  

E-Print Network (OSTI)

Abstract — The aim of this literature indicate that graphene composites are promising multifunctional materials with improved tensile strength and elastic modulus, mechanical strength, optical property, electrical and thermal conductivity. Its unique quality light weight, high strength, excellent electric conductivity makes it differ from any other material. It has ability to replace the silicon and change the scenario of semiconductor devices. It is a base of nano technology. Due to its unique properties, it will sets the new dimension in the nano techno world. Keywords — Molybdenum-disulphide (MoS 2), chemically reduced graphene oxide (CRGO), indium tin oxide (ITO), graphene oxide (GO), thermally reduce graphene oxide (TRGO) I.

Ankita Dixit; Divya Dixit; Vidhi Vart Ch; Ashok Kajla

115

Making better batteries with metal oxide & graphene composites  

ScienceCinema (OSTI)

Learn how PNNL and Princeton scientists create better materials for batteries, materials that assemble on their own into durable nanocomposites.

None

2012-12-31T23:59:59.000Z

116

Health monitoring method for composite materials  

DOE Patents (OSTI)

An in-situ method for monitoring the health of a composite component utilizes a condition sensor made of electrically conductive particles dispersed in a polymeric matrix. The sensor is bonded or otherwise formed on the matrix surface of the composite material. Age-related shrinkage of the sensor matrix results in a decrease in the resistivity of the condition sensor. Correlation of measured sensor resistivity with data from aged specimens allows indirect determination of mechanical damage and remaining age of the composite component.

Watkins, Jr., Kenneth S. (Dahlonega, GA); Morris, Shelby J. (Hampton, VA)

2011-04-12T23:59:59.000Z

117

Novel Composite Materials Demonstrate Ultra-sensitivity  

NLE Websites -- All DOE Office Websites (Extended Search)

2, Issue 25 2, Issue 25 Novel Composite Materials Demonstrate Ultra-sensitivity Gold nanowires on graphite templates used in gas sensing application page 2 Coronary Stent Wins Technology Transfer Award page 4 University of Oregon Team Wins Competition for Commercializing NETL Technology page 5 the ENERGY lab NATIONAL ENERGY TECHNOLOGY LABORATORY 2 Novel Composite Materials Demonstrate Ultra-sensitivity-Gold nanowires on graphite templates used in gas sensing applications ____________________2 Coronary Stent Wins Technology Transfer Award ________4 University of Oregon Team Wins Competition for Commercializing NETL Technology __________________5 NETL & WVU Researchers Design New Catalysts for CO 2 Management ___________________________________6 Structurally Dynamic MOF Sorbent Selectively Adsorbs

118

Cyclododecane as support material for clean and facile transfer of large-area few-layer graphene  

SciTech Connect

The transfer of chemical vapor deposited graphene is a crucial process, which can affect the quality of the transferred films and compromise their application in devices. Finding a robust and intrinsically clean material capable of easing the transfer of graphene without interfering with its properties remains a challenge. We here propose the use of an organic compound, cyclododecane, as a transfer material. This material can be easily spin coated on graphene and assist the transfer, leaving no residues and requiring no further removal processes. The effectiveness of this transfer method for few-layer graphene on a large area was evaluated and confirmed by microscopy, Raman spectroscopy, x-ray photoemission spectroscopy, and four-point probe measurements. Schottky-barrier solar cells with few-layer graphene were fabricated on silicon wafers by using the cyclododecane transfer method and outperformed reference cells made by standard methods.

Capasso, A.; Leoni, E.; Dikonimos, T.; Buonocore, F.; Lisi, N. [ENEA, Materials Technology Unit, Surface Technology Laboratory, Casaccia Research Centre, Via Anguillarese 301, 00060 Rome (Italy); De Francesco, M. [ENEA, Technical Unit for Renewable Energies Sources, Casaccia Research Center, Via Anguillarese 301, 00060 Rome (Italy); Lancellotti, L.; Bobeico, E. [ENEA, Portici Research Centre, P.le E. Fermi 1, 80055 Portici (Italy); Sarto, M. S.; Tamburrano, A.; De Bellis, G. [Research Center on Nanotechnology Applied to Engineering of Sapienza (CNIS), SSNLab, Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome (Italy)

2014-09-15T23:59:59.000Z

119

Method of making carbon nanotube composite materials  

DOE Patents (OSTI)

The present invention is a method of making a composite polymeric material by dissolving a vinyl thermoplastic polymer, un-functionalized carbon nanotubes and hydroxylated carbon nanotubes and optionally additives in a solvent to make a solution and removing at least a portion of the solvent after casting onto a substrate to make thin films. The material has enhanced conductivity properties due to the blending of the un-functionalized and hydroxylated carbon nanotubes.

O'Bryan, Gregory; Skinner, Jack L; Vance, Andrew; Yang, Elaine Lai; Zifer, Thomas

2014-05-20T23:59:59.000Z

120

Synthesis of cobalt oxide-reduced graphene nanocomposite and its enhanced electrochemical properties as negative material for alkaline secondary battery  

Science Journals Connector (OSTI)

Abstract A potential negative electrode material Co3O4@rGO is synthesized via a facile reflux condensation route. The electrochemical performances of Co3O4@rGO composite for alkaline rechargeable Ni/Co batteries have been systemically investigated for the first time. The reduced-graphene can remarkably enhance the electrochemical activity of Co3O4 materials, leading to a notable improvement of discharge capacity, cycle stability and rate capability. Interestingly, the maximum discharge capacity of Co3O4@rGO-20 (additive amount of GO is 20 mg) electrode can reach 511.4 mAh g?1 with the capacity retention of 89.1% after 100 cycles at a discharge current of 100 mA g?1. A properly electrochemical reaction mechanism of Co3O4@rGO electrode is also constructed in detail.

Yanan Xu; Xiaofeng Wang; Cuihua An; Yijing Wang; Lifang Jiao; Huatang Yuan

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Defective graphene as promising anode material for Na-ion battery and Ca-ion battery  

E-Print Network (OSTI)

We have investigated adsorption of Na and Ca on graphene with divacancy (DV) and Stone-Wales (SW) defect. Our results show that adsorption is not possible on pristine graphene. However, their adsorption on defective sheet is energetically favorable. The enhanced adsorption can be attributed to the increased charge transfer between adatoms and underlying defective sheet. With the increase in defect density until certain possible limit, maximum percentage of adsorption also increases giving higher battery capacity. For maximum possible DV defect, we can achieve maximum capacity of 1459 mAh/g for Na-ion batteries (NIBs) and 2900 mAh/g for Ca-ion batteries (CIBs). For graphene full of SW defect, we find the maximum capacity of NIBs and CIBs is around 1071 mAh/g and 2142 mAh/g respectively. Our results will help create better anode materials with much higher capacity and better cycling performance for NIBs and CIBs.

Datta, Dibakar; Shenoy, Vivek B

2013-01-01T23:59:59.000Z

122

Metalized T graphene: A reversible hydrogen storage material at room temperature  

SciTech Connect

Lithium (Li)-decorated graphene is a promising hydrogen storage medium due to its high capacity. However, homogeneous mono-layer coating graphene with lithium atoms is metastable and the lithium atoms would cluster on the surface, resulting in the poor reversibility. Using van der Waals-corrected density functional theory, we demonstrated that lithium atoms can be homogeneously dispersed on T graphene due to a nonuniform charge distribution in T graphene and strong hybridizations between the C-2p and Li-2p orbitals. Thus, Li atoms are not likely to form clusters, indicating a good reversible hydrogen storage. Both the polarization mechanism and the orbital hybridizations contribute to the adsorption of hydrogen molecules (storage capacity of 7.7?wt. %) with an optimal adsorption energy of 0.19?eV/H{sub 2}. The adsorption/desorption of H{sub 2} at ambient temperature and pressure is also discussed. Our results can serve as a guide in the design of new hydrogen storage materials based on non-hexagonal graphenes.

Ye, Xiao-Juan; Zhong, Wei, E-mail: csliu@njupt.edu.cn, E-mail: wzhong@nju.edu.cn; Du, You-Wei [Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing 210093 (China); Liu, Chun-Sheng, E-mail: csliu@njupt.edu.cn, E-mail: wzhong@nju.edu.cn [Key Laboratory of Radio Frequency and Micro-Nano Electronics of Jiangsu Province, Nanjing University of Posts and Telecommunications, Nanjing 210023 (China); Zeng, Zhi [Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (China)

2014-09-21T23:59:59.000Z

123

Electrical and Thermoelectrical Transport Properties of Graphene  

E-Print Network (OSTI)

IV Large Memory Effect in Graphene Based Devices IV-1Transport Properties of Graphene A Dissertation submitted into study the new material, graphene. By investigating the

Wang, Deqi

2011-01-01T23:59:59.000Z

124

Graphene Growth on Low Carbon Solubility Metals  

E-Print Network (OSTI)

The electronic properties of graphene. Reviews of Modernand E.A. Sutter, Epitaxial graphene on ruthenium. Natureopening in epitaxial graphene. Nature Materials, 2007. 6(

Wofford, Joseph Monroe

2012-01-01T23:59:59.000Z

125

TiO2 nanoparticles on nitrogen-doped graphene as anode material for lithium ion batteries  

Science Journals Connector (OSTI)

Anatase TiO2...nanoparticles in situ grown on nitrogen-doped, reduced graphene oxide (rGO) have been successfully synthesized ... as an anode material for the lithium ion battery. The nanosized TiO2 particles wer...

Dan Li; Dongqi Shi; Zongwen Liu; Huakun Liu…

2013-04-01T23:59:59.000Z

126

Advanced Materials and Processing of Composites for High Volume...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

and Processing of Composites for High Volume Applications FY 2009 Progress Report for Lightweighting Materials - 8. Polymer Composites Research and Development Carbon Fiber SMC...

127

SnO2/graphene composite with high lithium storage capability for lithium rechargeable batteries  

Science Journals Connector (OSTI)

SnO2/graphene nanocomposites have been fabricated by a simple...2...nanoparticles to be formed and uniformly decorated on the graphene. The electrostatic attraction between a graphene nanosheet (GNS) and the echi...

Haegyeom Kim; Sung-Wook Kim; Young-Uk Park; Hyeokjo Gwon; Dong-Hwa Seo…

2010-11-01T23:59:59.000Z

128

Sulfur-graphene oxide material for lithium-sulfur battery cathodes  

NLE Websites -- All DOE Office Websites (Extended Search)

Sulfur-graphene oxide material for lithium-sulfur battery cathodes Sulfur-graphene oxide material for lithium-sulfur battery cathodes Theoretical specific energy and theoretical energy density Scanning electron micrograph of the GO-S nanocomposite June 2013 Searching for a safer, less expensive alternative to today's lithium-ion batteries, scientists have turned to lithium-sulfur as a possible chemistry for next-generation batteries. Li/S batteries have several times the energy storage capacity of the best currently available rechargeable Li-ion battery, and sulfur is inexpensive and nontoxic. Current batteries using this chemistry, however, suffer from extremely short cycle life-they don't last through many charge-discharge cycles before they fail. A research team led by Elton Cairns and Yuegang Zhang has developed a new

129

Composite materials for thermal energy storage  

DOE Patents (OSTI)

The present invention discloses composite material for thermal energy storage based upon polyhydric alcohols, such as pentaerythritol, trimethylol ethane (also known as pentaglycerine), neopentyl glycol and related compounds including trimethylol propane, monoaminopentaerythritol, diamino-pentaerythritol and tris(hydroxymethyl)acetic acid, separately or in combinations, which provide reversible heat storage through crystalline phase transformations. These phase change materials do not become liquid during use and are in contact with at least one material selected from the group consisting of metals, carbon siliceous, plastic, cellulosic, natural fiber, artificial fiber, concrete, gypsum, porous rock, and mixtures thereof. Particulate additions, such as aluminum or graphite powders, as well as metal and carbon fibers can also be incorporated therein. Particulate and/or fibrous additions can be introduced into molten phase change materials which can then be cast into various shapes. After the phase change materials have solidified, the additions will remain dispersed throughout the matrix of the cast solid. The polyol is in contact with at least one material selected from the group consisting of metals, carbon siliceous, plastic, cellulosic, natural fiber, artificial fiber, concrete, gypsum, and mixtures thereof.

Benson, David K. (Golden, CO); Burrows, Richard W. (Conifer, CO); Shinton, Yvonne D. (Northglenn, CO)

1986-01-01T23:59:59.000Z

130

Graphene and its Hybrid Nanostructures for Nanoelectronics and Energy Applications  

E-Print Network (OSTI)

modification of graphene. Advanced Materials, 2008. 20 (16):S. Novoselov. The rise of graphene. Nature Materials, 2007.transport in suspended graphene. Nature Nanotechnology,

LIN, JIAN

2011-01-01T23:59:59.000Z

131

Solvothermal synthesis of NiAl double hydroxide microspheres on a nickel foam-graphene as an electrode material for pseudo-capacitors  

SciTech Connect

In this paper, we demonstrate excellent pseudo-capacitance behavior of nickel-aluminum double hydroxide microspheres (NiAl DHM) synthesized by a facile solvothermal technique using tertbutanol as a structure-directing agent on nickel foam-graphene (NF-G) current collector as compared to use of nickel foam current collector alone. The structure and surface morphology were studied by X-ray diffraction analysis, Raman spectroscopy and scanning and transmission electron microscopies respectively. NF-G current collector was fabricated by chemical vapor deposition followed by an ex situ coating method of NiAl DHM active material which forms a composite electrode. The pseudocapacitive performance of the composite electrode was investigated by cyclic voltammetry, constant charge–discharge and electrochemical impedance spectroscopy measurements. The composite electrode with the NF-G current collector exhibits an enhanced electrochemical performance due to the presence of the conductive graphene layer on the nickel foam and gives a specific capacitance of 1252 F g{sup ?1} at a current density of 1 A g{sup ?1} and a capacitive retention of about 97% after 1000 charge–discharge cycles. This shows that these composites are promising electrode materials for energy storage devices.

Momodu, Damilola; Bello, Abdulhakeem; Dangbegnon, Julien; Barzeger, Farshad; Taghizadeh, Fatimeh; Fabiane, Mopeli; Manyala, Ncholu, E-mail: ncholu.manyala@up.ac.za [Department of Physics, Institute of Applied Materials, SARChI Chair in Carbon Technology and Materials, University of Pretoria, Pretoria 0028, South Africa. (South Africa); Johnson, A. T. Charlie [Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104 (United States)

2014-09-15T23:59:59.000Z

132

Graphene-based Material Systems for Nanoelectronics and Energy Storage Devices  

E-Print Network (OSTI)

of High-Quality and Uniform Graphene Films on Copper Foils"and grain boundaries in graphene grown by chemical vapourin patterned epitaxial graphene" Science 2006, 312, 1191. D.

Guo, Shirui

2012-01-01T23:59:59.000Z

133

ENG 4793: Composite Materials and Processes 1 Combining Thermoplastics with  

E-Print Network (OSTI)

1 ENG 4793: Composite Materials and Processes 1 Combining Thermoplastics with Reinforcing Fibers ver 1 ENG 4793: Composite Materials and Processes 2 Outline · Issues · Approaches ­ Short Fibers ­ Long Fibers ­ Continuous Fibers · Conclusions ENG 4793: Composite Materials and Processes 3 Issues

Colton, Jonathan S.

134

Materials  

NLE Websites -- All DOE Office Websites (Extended Search)

2 MAG LAB REPORTS Volume 18 No. 1 CONDENSED MATTER SCIENCE Technique development, graphene, magnetism & magnetic materials, topological insulators, quantum fl uids & solids,...

135

Fabrication of composite materials with addition of graphene platelets.  

E-Print Network (OSTI)

??This PhD project set out to tackle the disadvantages of brittleness and low corrosion resistance that ceramics and mild steel bear respectively by developing ceramic… (more)

Liu, Jian

2014-01-01T23:59:59.000Z

136

Development of graphene composite materials for lithium ion batteries.  

E-Print Network (OSTI)

??Global warming caused by the excessive use of fossil fuels has become a severe problem in the modern world. Increasing energy demand worldwide and mandates… (more)

Zhong, Chao

2013-01-01T23:59:59.000Z

137

Graphene composites as anode materials in lithium-ion batteries  

Science Journals Connector (OSTI)

Since the world of mobile phones and laptops has significantly altered by a big designer named Steve Jobs, the electronic industries have strived to prepare smaller, thinner and lower weight products. The giant e...

M. Mazar Atabaki; R. Kovacevic

2013-03-01T23:59:59.000Z

138

Environmentally benign graphite intercalation compound composition for exfoliated graphite, flexible graphite, and nano-scaled graphene platelets  

SciTech Connect

A carboxylic-intercalated graphite compound composition for the production of exfoliated graphite, flexible graphite, or nano-scaled graphene platelets. The composition comprises a layered graphite with interlayer spaces or interstices and a carboxylic acid residing in at least one of the interstices, wherein the composition is prepared by a chemical oxidation reaction which uses a combination of a carboxylic acid and hydrogen peroxide as an intercalate source. Alternatively, the composition may be prepared by an electrochemical reaction, which uses a carboxylic acid as both an electrolyte and an intercalate source. Exfoliation of the invented composition does not release undesirable chemical contaminants into air or drainage.

Zhamu, Aruna; Jang, Bor Z.

2014-06-17T23:59:59.000Z

139

Graphene as a high-capacity anode material for lithium ion batteries  

Science Journals Connector (OSTI)

Graphene was produced via a soft chemistry synthetic route for lithium ion battery applications. The sample was characterized by X ... electron microscopy, respectively. The electrochemical performances of graphene

Hongdong Liu ???; Jiamu Huang ???; Xinlu Li…

2013-04-01T23:59:59.000Z

140

Graphene anchored with mesoporous NiO nanoplates as anode material for lithium-ion batteries  

Science Journals Connector (OSTI)

Graphene is an excellent substrate to load nanomaterials ... stability. In this study, thermal exfoliated functionalized graphene sheets with good conductivity and high BET ... synthesis approach. Electrochemical...

Danfeng Qiu; Zijing Xu; Mingbo Zheng; Bin Zhao…

2012-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

2D Dirac Materials: From Graphene to Topological Insulators  

E-Print Network (OSTI)

Hor, R. J. Cava and M. Z. Hasan, Nature, 452, 970 (2007). [14] M.Z. Hasan, and C. L Kane, Rev. Mod. Phys. 82, 3045 (Cava, A. Bansil, and M. Z. Hasan, Nature Materials, 9, 546 (

Teweldebrhan, Desalegne Bekuretsion

2011-01-01T23:59:59.000Z

142

Sonochemical synthesis of SnO2/carbon nanotubes encapsulated in graphene sheets composites for lithium ion batteries with superior electrochemical performance  

Science Journals Connector (OSTI)

Abstract The SnO2/carbon nanotubes encapsulated in graphene sheets (CSGN) composites are synthesized via a sonochemical method which is straightforward, low-cost and operable under ambient conditions. The open spaces formed by carbon nanotubes and graphene offering the accommodation of volume change and the access of an easy electrolyte-wetting, and the improved electrical conductivity by the presence of graphene and carbon nanotubes, lead to the superior cycling performance. As a result, the CSGN with SnO2 content of 61.4 wt% exhibits a reversible specific capacity of 842.9 mAh g?1 at the first cycle and retains 793.8 mAh g?1 after 50 cycles at a current density of 125 mA g?1, indicating a high capacity retention rate of 94%. The cycling performance is attributed to the unique structure of CSGN and enhanced electrical conductivity, which may make much sense to the structure designing of other electrode materials for lithium ion batteries.

Bin Huang; Juan Yang; Youlan Zou; Lulu Ma; Xiangyang Zhou

2014-01-01T23:59:59.000Z

143

Viscoelastic behavior of fiber-reinforced composite materials undergoing cure  

E-Print Network (OSTI)

A viscoelastic material model has been proposed to characterize the curing and thermal effects on the viscoelastic material properties of both the matrix material and the composite lamina. Micromechanics simulations are used to generate...

Wang, Kai

1999-01-01T23:59:59.000Z

144

Tailoring The Microwave Permittivity And Permeability Of Composite Materials  

E-Print Network (OSTI)

1 Tailoring The Microwave Permittivity And Permeability Of Composite Materials Kenneth M. Bober/Lowell, Lowell, MA 01854 ABSTRACT The microwave permittivity( r ) and permeability( r ) of composite materials. Polynomials are also used for the ferrite composites because it was determined that the MG theory was unable

Massachusetts at Lowell, University of

145

Polymer and Composite Materials Meeting Agenda  

NLE Websites -- All DOE Office Websites (Extended Search)

(all times in Eastern Time Zone) (all times in Eastern Time Zone) Start End Activity POC 08:00 08:45 Reception and badging DOE 08:45 09:00 Welcome and meeting objectives / expectations / time horizon for research activities (targets) Erika Sutherland, Sunita Satyapal 09:00 10:00 Polymer/elastomer and composite material science: key issues, knowledge gaps, R&D/testing data needs (40 min speaking, 20 min Q&A) Kevin Simmons 10:00 10:30 Codes and standards requirements - SAE J2579, SAE J2601: knowledge gaps, R&D data/testing needs Mike Veenstra 10:30 11:00 Break 11:00 11:30 Codes and standards requirements -CSA HGV 4, ASME X and B31: knowledge gaps, R&D data/testing needs Aaron Harris 11:30 12:00 Polymer/elastomer Draft R&D Work Plan ideas / Describe

146

Method of preparing corrosion resistant composite materials  

DOE Patents (OSTI)

Method of manufacture of ceramic materials which require stability in severely-corrosive environment having high alkali-metal activity, high sulfur/sulfide activity and/or molten halides at temperatures of 200.degree.-550.degree. C. or organic salt (including SO.sub.2 and SO.sub.2 Cl.sub.2) at temperatures of 25.degree.-200.degree. C. These surfide ceramics form stoichiometric (single-phase) compounds with sulfides of Ca, Li, Na, K, Al, Mg, Si, Y, La, Ce, Ga, Ba, Zr and Sr and show melting-points that are sufficiently low and have excellent wettability with many metals (Fe, Ni, Mo) to easily form metal/ceramic seals. Ceramic compositions are also formulated to adequately match thermal expansion coefficient of adjacent metal components.

Kaun, Thomas D. (320 Willow St., New Lenox, IL 60451)

1993-01-01T23:59:59.000Z

147

Structural Health Monitoring of Smart Composite Material by Acoustic Emission  

E-Print Network (OSTI)

Structural Health Monitoring of Smart Composite Material by Acoustic Emission S. Masmoudia , A. El composite structures gives the opportunity to develop smart materials for health monitoring systems and to follow the evolution of these various mechanisms for both types of materials (with and without sensors

Paris-Sud XI, Université de

148

Molybdenum nitride/nitrogen-doped graphene hybrid material for lithium storage in lithium ion batteries  

Science Journals Connector (OSTI)

Abstract Molybdenum nitride and nitrogen-doped graphene nanosheets (MoN/GNS) hybrid materials are synthesized by a simple hydrothermal method combined with a heat treatment at 800 °C under an ammonia atmosphere. It is found by scanning and transmission electron microscopy that MoN nanoparticles ranging from 20 to 40 nm in diameter are homogeneously anchored to GNS. The electrochemical performance of MoN/GNS as a possible anode material for Li-ion batteries is investigated. Galvanostatic charge/discharge experiments reveal that the hybrid materials exhibit an enhanced lithium storage capacity and excellent rate capacity as a result of its efficient electronic and ionic mixed conducting network. The electrochemical results demonstrate that the weight ratio of GNS and MoN had significant effect on the electrochemical performance.

Botao Zhang; Guanglei Cui; Kejun Zhang; Lixue Zhang; Pengxian Han; Shanmu Dong

2014-01-01T23:59:59.000Z

149

Experimental Studies of Oxide Magnetic Tunnel Junctions and Graphene  

E-Print Network (OSTI)

electron interaction in graphene. The central Nernst peak83, 6694 (1998). Chapter IV Introduction to Graphene IV-1Discovery of Graphene Carbon-based electronic materials have

Liu, Xinfei

2012-01-01T23:59:59.000Z

150

Computational Modeling of Graphene Oxide Exfoliation and Lithium Storage Characteristics.  

E-Print Network (OSTI)

??Graphene oxide is a two dimensional material obtained by adsorption of oxygen or oxygen-containing groups on graphene. Stacked layers of graphene oxide constitute graphite oxide.… (more)

Mortezaee, Reza

2013-01-01T23:59:59.000Z

151

Validation of Material Models for Automotive Carbon Fiber Composite...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Validation of Material Models for Automotive Carbon Fiber Composite Structures (VMM) Libby Berger (General Motors), Omar Faruque (Ford) Co-Principal Investigators US Automotive...

152

First Observation of Plasmarons in Graphene  

NLE Websites -- All DOE Office Websites (Extended Search)

First Observation of Plasmarons First Observation of Plasmarons in Graphene First Observation of Plasmarons in Graphene Print Wednesday, 30 June 2010 00:00 An international team of scientists performing angle-resolved photoemission spectroscopy (ARPES) experiments at ALS Beamline 7.0.1 have found that composite particles called plasmarons play a vital role in determining graphene's properties. A plasmaron consists of a charge carrier (electron or hole) coupled with a plasmon-an electron density wave. Although plasmarons were proposed theoretically in the late 1960s, and indirect evidence of them has been found, this work is the first observation of their distinct energy bands in graphene, or indeed in any material. The discovery may hasten the day when graphene can be used for "plasmonics" to build ultrafast computers-perhaps even room-temperature quantum computers-plus a wide range of other tools and applications.

153

First Observation of Plasmarons in Graphene  

NLE Websites -- All DOE Office Websites (Extended Search)

First Observation of Plasmarons in Graphene Print First Observation of Plasmarons in Graphene Print An international team of scientists performing angle-resolved photoemission spectroscopy (ARPES) experiments at ALS Beamline 7.0.1 have found that composite particles called plasmarons play a vital role in determining graphene's properties. A plasmaron consists of a charge carrier (electron or hole) coupled with a plasmon-an electron density wave. Although plasmarons were proposed theoretically in the late 1960s, and indirect evidence of them has been found, this work is the first observation of their distinct energy bands in graphene, or indeed in any material. The discovery may hasten the day when graphene can be used for "plasmonics" to build ultrafast computers-perhaps even room-temperature quantum computers-plus a wide range of other tools and applications.

154

First Observation of Plasmarons in Graphene  

NLE Websites -- All DOE Office Websites (Extended Search)

First Observation of Plasmarons in Graphene Print First Observation of Plasmarons in Graphene Print An international team of scientists performing angle-resolved photoemission spectroscopy (ARPES) experiments at ALS Beamline 7.0.1 have found that composite particles called plasmarons play a vital role in determining graphene's properties. A plasmaron consists of a charge carrier (electron or hole) coupled with a plasmon-an electron density wave. Although plasmarons were proposed theoretically in the late 1960s, and indirect evidence of them has been found, this work is the first observation of their distinct energy bands in graphene, or indeed in any material. The discovery may hasten the day when graphene can be used for "plasmonics" to build ultrafast computers-perhaps even room-temperature quantum computers-plus a wide range of other tools and applications.

155

First Observation of Plasmarons in Graphene  

NLE Websites -- All DOE Office Websites (Extended Search)

First Observation of Plasmarons in Graphene Print First Observation of Plasmarons in Graphene Print An international team of scientists performing angle-resolved photoemission spectroscopy (ARPES) experiments at ALS Beamline 7.0.1 have found that composite particles called plasmarons play a vital role in determining graphene's properties. A plasmaron consists of a charge carrier (electron or hole) coupled with a plasmon-an electron density wave. Although plasmarons were proposed theoretically in the late 1960s, and indirect evidence of them has been found, this work is the first observation of their distinct energy bands in graphene, or indeed in any material. The discovery may hasten the day when graphene can be used for "plasmonics" to build ultrafast computers-perhaps even room-temperature quantum computers-plus a wide range of other tools and applications.

156

First Observation of Plasmarons in Graphene  

NLE Websites -- All DOE Office Websites (Extended Search)

First Observation of Plasmarons in Graphene Print First Observation of Plasmarons in Graphene Print An international team of scientists performing angle-resolved photoemission spectroscopy (ARPES) experiments at ALS Beamline 7.0.1 have found that composite particles called plasmarons play a vital role in determining graphene's properties. A plasmaron consists of a charge carrier (electron or hole) coupled with a plasmon-an electron density wave. Although plasmarons were proposed theoretically in the late 1960s, and indirect evidence of them has been found, this work is the first observation of their distinct energy bands in graphene, or indeed in any material. The discovery may hasten the day when graphene can be used for "plasmonics" to build ultrafast computers-perhaps even room-temperature quantum computers-plus a wide range of other tools and applications.

157

Fabrication and long-wavelength characterization of neat and chemically modified graphene  

SciTech Connect

Graphene, a single- or several layer-thick carbon, attracts significant research activity because of its exceptional material properties. Graphene is a promising material for optoelectronic applications. Neat graphene demonstrates potential as a material for long wavelength photodetectors working at elevated temperatures. Chemical modification of graphene opens up many new applications of this material in electronics, in new composite materials, and in new catalysts for different chemical processes. Chemical vapor deposition-grown large-area graphene can be successfully modified with the creation of benzyne attachments. The investigation of microwave properties is an important part of graphene research. Two variants of near-field long wavelength microscopy were found efficient with graphene. Measurements with a probe formed by an electrically open end of a 4 GHz half-lambda parallel-strip transmission line resonator allow the implementation of an electrodynamic model of graphene microwave impedance. The results of near-field scanning superconducting quantum interference device (SQUID) RF microscopy of graphite and graphene at 200 MHz shed light on mechanisms of AC graphene response: screening currents induced in graphene by an external RF magnetic field tend to localize near structural defects.

Kalugin, Nikolai G. [Departments of Materials Engineering and Chemistry, New Mexico Tech, Socorro, NM 87801 (United States)

2014-03-31T23:59:59.000Z

158

Novel Pyrolyzed Polyaniline-Grafted Silicon Nanoparticles Encapsulated in Graphene Sheets As Li-Ion Battery Anodes  

Science Journals Connector (OSTI)

Novel Pyrolyzed Polyaniline-Grafted Silicon Nanoparticles Encapsulated in Graphene Sheets As Li-Ion Battery Anodes ... The composite materials exhibit better cycling stability and Coulombic efficiency as anodes in lithium ion batteries, as compared to pure Si nanoparticles and physically mixed graphene/Si composites. ...

Zhe-Fei Li; Hangyu Zhang; Qi Liu; Yadong Liu; Lia Stanciu; Jian Xie

2014-04-04T23:59:59.000Z

159

Graphene-based Material Systems for Nanoelectronics and Energy Storage Devices  

E-Print Network (OSTI)

different carbon blacks in CF4 radiofrequency plasma" Carbonfluorine doped graphene with CF4 plasma treatment for 10s.fluorine doped graphene with CF4 plasma treatment for 10s.

Guo, Shirui

2012-01-01T23:59:59.000Z

160

Electrochemical studies of few-layered graphene as an anode material for Li ion batteries  

Science Journals Connector (OSTI)

Few-layered graphene (FLG) with specific surface area of only ~8.2 m2 g?1 was synthesized from graphene oxide (GO) using microwave-assisted exfoliation. GO was prepared using modified Hummers method. Few-layered ...

Shaikshavali Petnikota; Naresh K. Rotte…

2014-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Graphene as a protein crystal mounting material to reduce background scatter  

Science Journals Connector (OSTI)

A new method is presented to reduce background scatter by use of graphene-based mounting of protein crystals.

Wierman, J.L.

2013-08-03T23:59:59.000Z

162

Graphene/metal Oxide Nanocomposites for Li-ion Batteries  

Science Journals Connector (OSTI)

Our work focuses on preparing the graphene/metal oxide nanocomposites by facile methold and exploring the graphene/metal oxide composites with unique structural or compositions for...

Liang, Junfei; Li, Lidong; Guo, Lin

163

Process for fabricating composite material having high thermal conductivity  

DOE Patents (OSTI)

A process for fabricating a composite material such as that having high thermal conductivity and having specific application as a heat sink or heat spreader for high density integrated circuits. The composite material produced by this process has a thermal conductivity between that of diamond and copper, and basically consists of coated diamond particles dispersed in a high conductivity metal, such as copper. The composite material can be fabricated in small or relatively large sizes using inexpensive materials. The process basically consists, for example, of sputter coating diamond powder with several elements, including a carbide forming element and a brazeable material, compacting them into a porous body, and infiltrating the porous body with a suitable braze material, such as copper-silver alloy, thereby producing a dense diamond-copper composite material with a thermal conductivity comparable to synthetic diamond films at a fraction of the cost.

Colella, Nicholas J. (Livermore, CA); Davidson, Howard L. (San Carlos, CA); Kerns, John A. (Livermore, CA); Makowiecki, Daniel M. (Livermore, CA)

2001-01-01T23:59:59.000Z

164

MnO nanorods on graphene as an anode material for high capacity lithium ion batteries  

Science Journals Connector (OSTI)

The MnO/graphene hybrid nanocomposites were prepared by an in...2 nanorods were attached on the graphene oxides (GOs) to form the MnO2.../GO nanocomposites, which were reduced to the MnO/graphene hybrid under arg...

Tonghua Wu; Feiyue Tu; Suqin Liu; Shuxin Zhuang…

2014-02-01T23:59:59.000Z

165

3D hollow Sn@carbon-graphene hybrid material as promising anode for lithium-ion batteries  

Science Journals Connector (OSTI)

A 3D hollow Sn@C-graphene hybrid material (HSCG) with high capacity and excellent cyclic and rate performance is fabricated by a one-pot assembly method. Due to the fast electron and ion transfer as well as the efficient carbon buffer structure, the ...

Xiaoyu Zheng, Wei Lv, Yan-Bing He, Chen Zhang, Wei Wei, Ying Tao, Baohua Li, Quan-Hong Yang

2014-01-01T23:59:59.000Z

166

Flexible hydrogel-based functional composite materials  

DOE Patents (OSTI)

A composite having a flexible hydrogel polymer formed by mixing an organic phase with an inorganic composition, the organic phase selected from the group consisting of a hydrogel monomer, a crosslinker, a radical initiator, and/or a solvent. A polymerization mixture is formed and polymerized into a desired shape and size.

2013-10-08T23:59:59.000Z

167

Corrosion inhibiting composition for treating asbestos containing materials  

DOE Patents (OSTI)

A composition for transforming a chrysotile asbestos-containing material into a non-asbestos material is disclosed, wherein the composition comprises water, at least about 30% by weight of an acid component, optionally a source of fluoride ions, and a corrosion inhibiting amount of thiourea, a lower alkylthiourea, a C.sub.8 -C.sub.15 alkylpyridinium halide or mixtures thereof. A method of transforming an asbestos-containing building material, while part of a building structure, into a non-asbestos material by using the present composition also is disclosed.

Hartman, Judithann Ruth (Columbia, MD)

1998-04-21T23:59:59.000Z

168

Corrosion inhibiting composition for treating asbestos containing materials  

DOE Patents (OSTI)

A composition for transforming a chrysotile asbestos-containing material into a non-asbestos material is disclosed. The composition comprises water, at least about 30% by weight of an acid component, optionally a source of fluoride ions, and a corrosion inhibiting amount of thiourea, a lower alkylthiourea, a C{sub 8}{single_bond}C{sub 15} alkylpyridinium halide or mixtures. A method of transforming an asbestos-containing building material, while part of a building structure, into a non-asbestos material by using the present composition also is disclosed.

Hartman, J.R.

1998-04-21T23:59:59.000Z

169

Subeutectic Growth of Single-Crystal Silicon Nanowires Grown on and Wrapped with Graphene Nanosheets: High-Performance Anode Material for Lithium-Ion Battery  

Science Journals Connector (OSTI)

Subeutectic Growth of Single-Crystal Silicon Nanowires Grown on and Wrapped with Graphene Nanosheets: High-Performance Anode Material for Lithium-Ion Battery ... Yu, A.; Park, H. W.; Davies, A.; Higgins, D.; Chen, Z.; Xaio, X.Free-Standing Layer-by-Layer Hybrid Thin Film of Graphene-MnO2 Nanotube as Anode for Lithium Ion Batteries J. Phys. ...

Fathy M Hassan; Abdel Rahman Elsayed; Victor Chabot; Rasim Batmaz; Xingcheng Xiao; Zhongwei Chen

2014-07-31T23:59:59.000Z

170

Wettability of Graphene  

Science Journals Connector (OSTI)

Graphene, an atomically thin two-dimensional material, has received significant attention due to its extraordinary electronic, optical, and mechanical properties. Studies focused on understanding the wettability of graphene for thermo-fluidic and surface-...

Rishi Raj; Shalabh C. Maroo; Evelyn N. Wang

2013-03-04T23:59:59.000Z

171

Structural Automotive Components from Composite Materials | Department...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Annual Merit Review and Peer Evaluation Meeting, May 18-22, 2009 -- Washington D.C. lm08kia.pdf More Documents & Publications Structural Automotive Components from Composite...

172

Composition And Method For Removing Photoresist Materials From Electronic  

NLE Websites -- All DOE Office Websites (Extended Search)

Composition And Method For Removing Photoresist Materials From Composition And Method For Removing Photoresist Materials From Electronic Components Composition And Method For Removing Photoresist Materials From Electronic Components The invention is a combination of at least one dense phase fluid and at least one dense phase fluid modifier. Available for thumbnail of Feynman Center (505) 665-9090 Email Composition And Method For Removing Photoresist Materials From Electronic Components The invention is a combination of at least one dense phase fluid and at least one dense phase fluid modifier which can be used to contact substrates for electronic parts such as semiconductor wafers or chips to remove photoresist materials which are applied to the substrates during manufacture of the electronic parts. The dense phase fluid modifier is one

173

Polymer–Graphene Nanocomposites as Ultrafast-Charge and -Discharge Cathodes for Rechargeable Lithium Batteries  

SciTech Connect

Electroactive polymers are a new generation of 'green' cathode materials for rechargeable lithium batteries. We have developed nanocomposites combining graphene with two promising polymer cathode materials, poly(anthraquinonyl sulfide) and polyimide, to improve their high-rate performance. The polymer-graphene nanocomposites were synthesized through a simple in-situ polymerization in the presence of graphene sheets. The highly dispersed graphene sheets in the nanocomposite drastically enhanced the electronic conductivity and allowed the electrochemical activity of the polymer cathode to be efficiently utilized. This allows for ultrafast charging and discharging - the composite can deliver more than 100 mAh/g within just a few seconds.

Song, Zhiping; Xu, Terrence (Tianren) [Tianren; Gordin, Mikhail; Jiang, Yingbing; Bae, In-Tae; Xiao, Qiangfeng; Zhan, Hui; Liu, Jun; Wang, Donghai

2012-05-09T23:59:59.000Z

174

Composite materials with integrated embedded sensing networks  

E-Print Network (OSTI)

for Advanced Materials CNC computer numerical controlledcomputer numerical controlled (CNC) 3-axis milling machine.to cut the samples using a CNC 3-axis milling machine. The

Schaaf, Kristin Leigh

2008-01-01T23:59:59.000Z

175

Gram-Scale Synthesis of Graphene-Mesoporous SnO2 Composite as Anode for Lithium-ion Batteries  

Science Journals Connector (OSTI)

Abstract The gram-scale synthesis of graphene based mesoporous SnO2 composite (G-M-SnO2) has been successfully realized based on kirkendall effect. When used as anode for lithium ion batteries, it delivers a high reversible capacity of 1354 mAhg?1 after 50 cycles at 100 mAg?1 and excellent rate capability of 664 mAhg?1 at 2 Ag?1. The outstanding lithium storage performance mainly results from the synergistic effect of the ultrasmall SnO2 and conductive graphene nanoparticles, which not only enhanced the conductivity of the whole electrode but also provide buffer matrix for the expansion of SnO2 nanoparticles during charge-discharge process. Furthermore, the ultra-small size of SnO2 shortens the diffusion length of Li+/e? in SnO2.

Xiaowu Liu; Xiongwu Zhong; Zhenzhong Yang; Fusen Pan; Lin Gu; Yan Yu

2015-01-01T23:59:59.000Z

176

Dynamical mass generation of composite Dirac fermions and fractional quantum Hall effects near charge neutrality in graphene  

Science Journals Connector (OSTI)

We develop a composite Dirac fermion theory for the fractional quantum Hall effects (QHE) near charge neutrality in graphene. We show that the interactions between the composite Dirac fermions lead to a dynamical mass generation through exciton condensation. The four-fold spin–valley degeneracy is fully lifted due to the mass generation and exchange effects such that the odd-denominator fractional QHE observed in the vicinity of charge neutrality can be understood in terms of the integer QHE of composite Dirac fermions. At a filling factor ? = 1/2, we show that the massive composite Dirac fermion liquid is unstable against chiral p-wave pairing for weak Coulomb interactions and the ground state is a paired non-Abelian quantum Hall state described by the Moore–Read Pfaffian in the long wavelength limit.

Feng Cai; Yue Yu; Ziqiang Wang

2013-01-01T23:59:59.000Z

177

Synthesis of graphene nanosheets via oxalic acid-induced chemical reduction of exfoliated graphite oxide  

SciTech Connect

Preparing high-quality graphene through reduction of graphene oxide (GO) by oxalic acid is demonstrated in this paper. Transmission electron microscopy, scanning electron microscopy, Fourier transform infrared spectrometry, X-ray diffraction and Raman spectrometry were taken to confirm the reduction of GO and the formation of graphene under these mild conditions. Thermogravimetric analysis and conductivity measurements further testify the excellent thermal stability and conductivity of the obtained graphene. A possible mechanism for the reduction process was also proposed. Furthermore, a Pt-graphene composite was fabricated on a glassy carbon electrode and excellent electrocatalytic activity towards methanol oxidation was observed. With advantages of low toxicity, simple purification process and high quality of the product, oxalic acid provides a feasible route to prepare graphene from GO under mild conditions, thus facilitating the use of graphene-based materials for large-scale applications.

Song, Peng; Zhang, Xiao-Yan; Sun, Mingxun; Cui, Xiao-Li; Lin, Yuehe

2012-02-01T23:59:59.000Z

178

Controlling Performance of Laminated Composites Using Piezoelectric Materials  

E-Print Network (OSTI)

Composite materials are increasingly used in aerospace, underwater, and automotive structures. Their use in structural applications is dictated by the outstanding strength and stiffness while being lightweight in addition to their flexibility...

Hasan, Zeaid

2012-02-14T23:59:59.000Z

179

Synthesis of graphene with both high nitrogen content and high surface area by annealing composite of graphene oxide and g-C3N4  

Science Journals Connector (OSTI)

In this paper, we propose a facile, catalyst-free thermal annealing approach for synthesis of N-doping graphene (NG) using graphitic carbon nitride (g...3N4) as the nitrogen source. Graphene with nitrogen content...

Yurong Deng; Kewei Liu; Hongmei Cao…

2014-10-01T23:59:59.000Z

180

Graphene-assisted near-field radiative heat transfer between corrugated polar materials  

SciTech Connect

Graphene has attracted great attention in nanoelectronics, optics, and energy harvesting. Here, the near-field radiative heat transfer between graphene-covered corrugated silica is investigated based on the exact scattering theory. It is found that graphene can improve the radiative heat flux between silica gratings by more than one order of magnitude and alleviate the performance sensitivity to lateral shift. The underlying mechanism is mainly attributed to the improved photon tunneling of modes away from phonon resonances. Besides, coating with graphene leads to nonlocal radiative transfer that breaks Derjaguin's proximity approximation and enables corrugated silica to outperform bulk silica in near-field radiation.

Liu, X. L.; Zhang, Z. M., E-mail: zhuomin.zhang@me.gatech.edu [G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States)

2014-06-23T23:59:59.000Z

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Epitaxial graphene on silicon carbide: Introduction to structured graphene  

E-Print Network (OSTI)

Epitaxial graphene on silicon carbide: Introduction to structured graphene Ming Ruan 1 , Yike Hu 1, France Abstract We present an introduction to the rapidly growing field of epitaxial graphene on silicon present, highly evolved state. The potential of epitaxial graphene as a new electronic material is now

Paris-Sud XI, Université de

182

Composite Materials for Hazard Mitigation of Reactive Metal Hydrides.  

SciTech Connect

In an attempt to mitigate the hazards associated with storing large quantities of reactive metal hydrides, polymer composite materials were synthesized and tested under simulated usage and accident conditions. The composites were made by polymerizing vinyl monomers using free-radical polymerization chemistry, in the presence of the metal hydride. Composites with vinyl-containing siloxane oligomers were also polymerized with and without added styrene and divinyl benzene. Hydrogen capacity measurements revealed that addition of the polymer to the metal hydride reduced the inherent hydrogen storage capacity of the material. The composites were found to be initially effective at reducing the amount of heat released during oxidation. However, upon cycling the composites, the mitigating behavior was lost. While the polymer composites we investigated have mitigating potential and are physically robust, they undergo a chemical change upon cycling that makes them subsequently ineffective at mitigating heat release upon oxidation of the metal hydride. Acknowledgements The authors would like to thank the following people who participated in this project: Ned Stetson (U.S. Department of Energy) for sponsorship and support of the project. Ken Stewart (Sandia) for building the flow-through calorimeter and cycling test stations. Isidro Ruvalcaba, Jr. (Sandia) for qualitative experiments on the interaction of sodium alanate with water. Terry Johnson (Sandia) for sharing his expertise and knowledge of metal hydrides, and sodium alanate in particular. Marcina Moreno (Sandia) for programmatic assistance. John Khalil (United Technologies Research Corp) for insight into the hazards of reactive metal hydrides and real-world accident scenario experiments. Summary In an attempt to mitigate and/or manage hazards associated with storing bulk quantities of reactive metal hydrides, polymer composite materials (a mixture of a mitigating polymer and a metal hydride) were synthesized and tested under simulated usage and accident conditions. Mitigating the hazards associated with reactive metal hydrides during an accident while finding a way to keep the original capability of the active material intact during normal use has been the focus of this work. These composites were made by polymerizing vinyl monomers using free-radical polymerization chemistry, in the presence of the metal hydride, in this case a prepared sodium alanate (chosen as a representative reactive metal hydride). It was found that the polymerization of styrene and divinyl benzene could be initiated using AIBN in toluene at 70 degC. The resulting composite materials can be either hard or brittle solids depending on the cross-linking density. Thermal decomposition of these styrene-based composite materials is lower than neat polystyrene indicating that the chemical nature of the polymer is affected by the formation of the composite. The char-forming nature of cross-linked polystyrene is low and therefore, not an ideal polymer for hazard mitigation. To obtain composite materials containing a polymer with higher char-forming potential, siloxane-based monomers were investigated. Four vinyl-containing siloxane oligomers were polymerized with and without added styrene and divinyl benzene. Like the styrene materials, these composite materials exhibited thermal decomposition behavior significantly different than the neat polymers. Specifically, the thermal decomposition temperature was shifted approximately 100 degC lower than the neat polymer signifying a major chemical change to the polymer network. Thermal analysis of the cycled samples was performed on the siloxane-based composite materials. It was found that after 30 cycles the siloxane-containing polymer composite material has similar TGA/DSC-MS traces as the virgin composite material indicating that the polymer is physically intact upon cycling. Hydrogen capacity measurements revealed that addition of the polymer to the metal hydride in the form of a composite material reduced the inherent hydrogen storage capacity of the material. This

Pratt, Joseph William; Cordaro, Joseph Gabriel; Sartor, George B.; Dedrick, Daniel E.; Reeder, Craig L.

2012-02-01T23:59:59.000Z

183

The application of ultrasonics to assess damage in composite materials  

E-Print Network (OSTI)

THE APPLICATION OF ULTRASONICS TO ASSESS DAMAGE IN COMPOSITE MATERIALS A Thesis by JOHN GREGORY EDEN Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE... December 1985 Major Subjectr Aerospace Engineering THE APPLICATION OF ULTRASONICS TO ASSESS DAMAGE IN COMPOSITE MATERIALS A Thesis by JOHN GREGORY EDEN Approved as to style and content by: (V. . Kinra, Chairman) (D. H. Allen, Member) (R. A...

Eden, John Gregory

2012-06-07T23:59:59.000Z

184

Environmental assessment of thermal insulation composite material  

Science Journals Connector (OSTI)

Of other thermal insulation materials, the foam glass has most similar mechanical properties (PE...2008) and use (structural details exposed to high compressive loads). Therefore, it is (to a certain extend) comp...

Karel Struhala; Zuzana Stránská; Jan P?n?ík…

2014-12-01T23:59:59.000Z

185

The composite materials handbook (MIL handbook 17). Volume 2: Materials properties  

SciTech Connect

The Composite Materials Handbook (MIL Handbook 17) is THE source for data and usage guidelines for current and emerging polymer matrix composite materials. It provides you with the tools you will need to design and fabricate end items from polymer matrix composite materials and offers guidelines for how these data should be generated and used. The Handbook is a comprehensive guide of composites technology and engineering, an area that is advancing and changing rapidly. Data obtained and selected according to Volume 1 are published in Volume 2.

Not Available

1999-01-01T23:59:59.000Z

186

Lithium diffusion at Si-C interfaces in Silicon-Graphene composites  

SciTech Connect

Models of intercalated Li and its diffusion in Si-Graphene interfaces are investigated using Density Functional Theory. Results suggest that the presence of interfaces alters the energetics of Li binding and diffusion significantly compared to bare Si or Graphene surfaces. Our results show that cavities along reconstructed Si surface provide diffusion paths for Li. Diffusion barriers calculated along these cavities are significantly lower than penetration barriers to bulk Si. Interaction with Si surface results in graphene defects, creating Li diffusion paths that are confined along the cavities but have still lower barrier than in bulk Si.

Odbadrakh, Khorgolkhuu [ORNL; McNutt, Nichiolas William [University of Tennessee, Knoxville (UTK); Nicholson, Donald M. [Oak Ridge National Laboratory (ORNL); Rios, Orlando [ORNL; Keffer, David J. [University of Tennessee, Knoxville (UTK)

2014-01-01T23:59:59.000Z

187

Method of tissue repair using a composite material  

DOE Patents (OSTI)

A composite biocompatible hydrogel material includes a porous polymer matrix, the polymer matrix including a plurality of pores and providing a Young's modulus of at least 10 GPa. A calcium comprising salt is disposed in at least some of the pores. The porous polymer matrix can comprise cellulose, including bacterial cellulose. The composite can be used as a bone graft material. A method of tissue repair within the body of animals includes the steps of providing a composite biocompatible hydrogel material including a porous polymer matrix, the polymer matrix including a plurality of pores and providing a Young's modulus of at least 10 GPa, and inserting the hydrogel material into cartilage or bone tissue of an animal, wherein the hydrogel material supports cell colonization in vitro for autologous cell seeding.

Hutchens, Stacy A; Woodward, Jonathan; Evans, Barbara R; O'Neill, Hugh M

2014-03-18T23:59:59.000Z

188

Sandia National Laboratories: 3-D graphene architecture  

NLE Websites -- All DOE Office Websites (Extended Search)

graphene architecture Three-Dimensional Graphene Architectures On July 29, 2013, in Capabilities, Materials Science, News, News & Events, Office of Science, Research & Capabilities...

189

A Roadmap for Engineering Piezoelectricity in Graphene  

NLE Websites -- All DOE Office Websites (Extended Search)

Roadmap for Engineering Piezoelectricity in Graphene A Roadmap for Engineering Piezoelectricity in Graphene Doping this 'Miracle Material' May Lead to New Array of Nanoscale...

190

ADVANCED COMPOSITE MATERIALS TECHNOLOGY FOR ROTORCRAFT Andrew Makeev*, University of Texas at Arlington, Arlington, Texas, USA  

E-Print Network (OSTI)

ADVANCED COMPOSITE MATERIALS TECHNOLOGY FOR ROTORCRAFT Andrew Makeev*, University of Texas, Patz Materials & Technologies, Benicia, CA, USA Abstract Composite materials are increasingly used. In polymer-matrix composite structures, matrix-dominated failures impose severe limitations on structural

Texas at Arlington, University of

191

Moisture and temperature effects in composite materials  

E-Print Network (OSTI)

) Chairman of Advisory Committee: Dr. Y. Weitsman Th1s thesis concerns env1ronmental effects in graphite/epoxy composites, with emphas1s on environmentally induced damage. The thesis consists of two major parts. The first part presents an experimental 1... weight gain (in %) of a 12-ply unidirectional AS4/3502 graphite/epoxy laminate during exposure to 346'K, 95% R. H. environment. Data (i) and predictions of Flck's law (solid line) Moisture content (ln %) of a 12-ply unidirectional AS4/3502 graphite...

Fang, Gwo-Ping

2012-06-07T23:59:59.000Z

192

Polymeric compositions incorporating polyethylene glycol as a phase change material  

DOE Patents (OSTI)

A polymeric composition comprising a polymeric material and polyethylene glycol or end-capped polyethylene glycol as a phase change material, said polyethylene glycol and said end-capped polyethylene glycol having a molecular weight greater than about 400 and a heat of fusion greater than about 30 cal/g; the composition is useful in making molded and/or coated materials such as flooring, tiles, wall panels and the like; paints containing polyethylene glycols or end-capped polyethylene glycols are also disclosed.

Salyer, Ival O. (Dayton, OH); Griffen, Charles W. (Mason, OH)

1989-01-01T23:59:59.000Z

193

Lightweight Composite Materials for Heavy Duty Vehicles  

SciTech Connect

The main objective of this project is to develop, analyze and validate data, methodologies and tools that support widespread applications of automotive lightweighting technologies. Two underlying principles are guiding the research efforts towards this objective: • Seamless integration between the lightweight materials selected for certain vehicle systems, cost-effective methods for their design and manufacturing, and practical means to enhance their durability while reducing their Life-Cycle-Costs (LCC). • Smooth migration of the experience and findings accumulated so far at WVU in the areas of designing with lightweight materials, innovative joining concepts and durability predictions, from applications to the area of weight savings for heavy vehicle systems and hydrogen storage tanks, to lightweighting applications of selected systems or assemblies in light–duty vehicles.

Pruez, Jacky; Shoukry, Samir; Williams, Gergis; Shoukry, Mark

2013-08-31T23:59:59.000Z

194

Preparation of Ag{sub 2}S-Graphene nanocomposite from a single source precursor and its surface-enhanced Raman scattering and photoluminescent activity  

SciTech Connect

Ag{sub 2}S-Graphene nanocomposite was prepared via a relatively facile hydrothermal method, using a single-source molecular (silver diethyldithiocarbamate [Ag(DDTC)]) as precursor and graphene sheets as a support material. The composite was characterized by X-ray power diffraction, X-ray photoelectron spectroscopy, Field-emission scanning electron microscope, transmission electron microscopy, Fourier transform infrared, Raman spectra and fluorescence spectroscopy. The experimental results show that the Ag{sub 2}S-Graphene nanocomposite displays surface-enhanced Raman scattering (SERS) activity for graphene oxide and reveals relatively better fluorescence property compared with pure Ag{sub 2}S. Highlights: {yields} Ag{sub 2}S nanoparticles are deposited on graphene sheets via a single source precursor. {yields} Graphene oxide is reduced to graphene in the hydrothermal reaction process. {yields} Ag{sub 2}S-Graphene system displays surface-enhanced Raman scattering activity and relatively better fluorescence property.

Pan Shugang; Liu Xiaoheng, E-mail: xhliu@mail.njust.edu.cn; Wang Xin

2011-11-15T23:59:59.000Z

195

Grained composite materials prepared by combustion synthesis under mechanical pressure  

DOE Patents (OSTI)

Dense, finely grained composite materials comprising one or more ceramic phase or phase and one or more metallic and/or intermetallic phase or phases are produced by combustion synthesis. Spherical ceramic grains are homogeneously dispersed within the matrix. Methods are provided, which include the step of applying mechanical pressure during or immediately after ignition, by which the microstructures in the resulting composites can be controllably selected.

Dunmead, Stephen D. (Davis, CA); Holt, Joseph B. (San Jose, CA); Kingman, Donald D. (Danville, CA); Munir, Zuhair A. (Davis, CA)

1990-01-01T23:59:59.000Z

196

From Laboratory to Industry: Unlocking the Potential of Graphene...  

NLE Websites -- All DOE Office Websites (Extended Search)

Materials Return to Search From Laboratory to Industry: Unlocking the Potential of Graphene Brookhaven Lab and Graphene Laboratories collaborate to bring atom-thin material to...

197

Inch-Scale High Throughput Metrology of Graphene and Patterned Graphene Oxide.  

E-Print Network (OSTI)

??Abstract Inch-Scale High Throughput Metrology of Graphene and Patterned Graphene Oxide by Dennis Pleskot Master of Science, Graduate Program in Materials Science and Engineering University… (more)

Pleskot, Dennis

2013-01-01T23:59:59.000Z

198

Electrostatic Discharge Sensitivity and Electrical Conductivity of Composite Energetic Materials  

SciTech Connect

Composite energetic material response to electrical stimuli was investigated and a correlation between electrical conductivity and ignition sensitivity was examined. The composites consisted of micrometer particle aluminum combined with another metal, metal oxide, or fluoropolymer. Of the nine tested mixtures, aluminum with copper oxide was the only mixture to ignite by electrostatic discharge with minimum ignition energy (MIE) of 25 mJ and an electrical conductivity of 1246.25 nS; two orders of magnitude higher than the next composite. This study showed a similar trend in MIE for ignition triggered by a discharged spark compared with a thermal hot wire source.

Michael A. Daniels; Daniel J. Prentice; Chelsea Weir; Michelle L. Pantoya; Gautham Ramachandran; Tim Dallas

2013-02-01T23:59:59.000Z

199

Novel Composite Materials for SOFC Cathode-Interconnect Contact  

SciTech Connect

This report summarized the research efforts and major conclusions of our University Coal Research Project, which focused on developing a new class of electrically-conductive, Cr-blocking, damage-tolerant Ag-perovksite composite materials for the cathode-interconnect contact of intermediate-temperature solid oxide fuel cell (SOFC) stacks. The Ag evaporation rate increased linearly with air flow rate initially and became constant for the air flow rate {ge} {approx} 1.0 cm {center_dot} s{sup -1}. An activation energy of 280 KJ.mol{sup -1} was obtained for Ag evaporation in both air and Ar+5%H{sub 2}+3%H{sub 2}O. The exposure environment had no measurable influence on the Ag evaporation rate as well as its dependence on the gas flow rate, while different surface morphological features were developed after thermal exposure in the oxidizing and reducing environments. Pure Ag is too volatile at the SOFC operating temperature and its evaporation rate needs to be reduced to facilitate its application as the cathode-interconnect contact. Based on extensive evaporation testing, it was found that none of the alloying additions reduced the evaporation rate of Ag over the long-term exposure, except the noble metals Au, Pt, and Pd; however, these noble elements are too expensive to justify their practical use in contact materials. Furthermore, the addition of La{sub 0.8}Sr{sub 0.2}MnO{sub 3} (LSM) into Ag to form a composite material also did not significantly modify the Ag evaporation rate. The Ag-perovskite composites with the perovskite being either (La{sub 0.6}Sr{sub 0.4})(Co{sub 0.8}Fe{sub 0.2})O{sub 3} (LSCF) or LSM were systematically evaluated as the contact material between the ferritic interconnect alloy Crofer 22 APU and the LSM cathode. The area specific resistances (ASRs) of the test specimens were shown to be highly dependent on the volume percentage and the type of the perovskite present in the composite contact material as well as the amount of thermal cycling that the specimens were subjected to during testing. The Ag-LSCF composite contact materials proved more effective in trapping Cr within the contact material and preventing Cr migration into the cathode than the Ag-LSM composites. Ag-perovskite composite contact materials are promising candidates for use in intermediate-temperature SOFC stacks with ferritic stainless steel interconnects due to their ability to maintain acceptably low ASRs while reducing Cr migration into the cathode material.

J. H. Zhu

2009-07-31T23:59:59.000Z

200

Inequalities in composite materials and Eshelby's Hyundae Lee(Inha University)  

E-Print Network (OSTI)

Inequalities in composite materials and Eshelby's conjecture Hyundae Lee(Inha University) February 11, 2014 Hyundae Lee(Inha University) Inequalities in composite materials and Eshelby's conjecture in composite materials and Eshelby's conjecture #12;Contents Bounds on composite materials and extreme

Kim, Yong Jung

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Composite structural materials play important roles in many engineering applications because of their potential for com-  

E-Print Network (OSTI)

PROBLEM Composite structural materials play important roles in many engineering applications. Composites are also pervasive among biologi- cal materials, exhibiting precise and intriguing architectures new composite designs that use hierarchical structures have been discovered, going directly from com

Polz, Martin

202

Graphene and Graphene Oxide: Biofunctionalization and Applications...  

NLE Websites -- All DOE Office Websites (Extended Search)

and Graphene Oxide: Biofunctionalization and Applications in Biotechnology. Graphene and Graphene Oxide: Biofunctionalization and Applications in Biotechnology. Abstract: Graphene...

203

Multifunctional composite materials and structures: A brief review  

Science Journals Connector (OSTI)

Recent advances in the area of multifunctional materials and structures are reviewed. Interest in this area has been driven by the need for systems that simultaneously perform structural and nonstructural functions. Multifunctional materials are by nature composite materials and new nanoreinforcements in particular have made it possible to achieve simultaneous improvements in properties such as stiffness compression strength damping electrical conductivity and fracture toughness. For example among the most important nonstructural functions that a structure may need is electrical conductivity but many composites have poorly conducting polymer matrix materials. However very small concentrations of carbon nanotubes or other conducting nanoreinforcements in polymers lead to disproportionately large improvements in the electrical conductivity of the nanocomposite. Recently developed composites with piezoelectric structural fiber reinforcements are capable of vibration control damping energy harvesting/storage or structural health monitoring. Recent research has also demonstrated the feasibility of self-healing polymers and polymercomposites based on the use of a microencapsulated healing agent and a catalyst for polymerizing the healing agent. Structurally integrated electronics such as batteries for energy storage are another recent application of multifunctional structure design. Other important nonstructural functions in multifunctional composite structures include electromagnetic interference shielding optical transparency and thermal conductivity.

Ronald F. Gibson

2011-01-01T23:59:59.000Z

204

INTERNATIONAL CONFERENCE ON COMPOSITE MATERIALS Improvements to toughening mechanisms in  

E-Print Network (OSTI)

to capture 3D damage mechanisms with voxel sizes of 0.7µm and 1.4µm respectively. Comparisons between18TH INTERNATIONAL CONFERENCE ON COMPOSITE MATERIALS Abstract Improvements to toughening mechanisms, especially since the inherent damage behaviour is three-dimensional (3D) requiring high resolution to capture

205

MoS2/Graphene Composite Paper for Sodium-Ion Battery Electrodes  

Science Journals Connector (OSTI)

We study the synthesis and electrochemical and mechanical performance of layered free-standing papers composed of acid-exfoliated few-layer molybdenum disulfide (MoS2) and reduced graphene oxide (rGO) flakes for use as a self-standing flexible electrode ...

Lamuel David; Romil Bhandavat; Gurpreet Singh

2014-01-21T23:59:59.000Z

206

Processing-Morphology-Property Relationships and Composite Theory Analysis of Reduced Graphene Oxide/Natural Rubber  

E-Print Network (OSTI)

-8 latex mixing could provide an effective means for production of graphene/rubber nanocomposites. Latex Oxide/Natural Rubber Nanocomposites Jeffrey R. Potts, Om Shankar, Ling Du, and Rodney S. Ruoff of Texas at Austin, 204 E. Dean Keeton St., Austin, Texas 78712, United States Goodyear Tire and Rubber

207

A novel "gelsol" strategy to synthesize TiO2 nanorod combining reduced graphene oxide composites  

E-Print Network (OSTI)

Graphene oxide Titanium dioxide Nanostructure Semiconductors Nanorods a b s t r a c t In this studyH value benefits the deprotonation of TEOA for adsorption to the stationary nuclei. Therefore triethanolamine (TEOA) with titanium (IV) isopropoxide (TIPO) at a molar ratio of [TEOA]:[TIPO]¼2:1, was added

Guo, John Zhanhu

208

Micromechanical Damage Models for Continuous Fiber Reinforced Composite Materials  

E-Print Network (OSTI)

of metal and ceramic-matrix composites, Acta Metallurgica etMMCs) and ceramic matrix composites (CMCs). In general, PMCsPolymer Matrix Composite Ceramic Matrix Composite Composite

Wu, Yi

2013-01-01T23:59:59.000Z

209

Invited Paper Shape Control of Composite Material Plates Using Piezoelectric Actuators  

E-Print Network (OSTI)

of smart structures. These material include piezoelectric polymers and ceramics, shape memory alloysInvited Paper Shape Control of Composite Material Plates Using Piezoelectric Actuators Brij N control of composite material plates using piezoelectric actuators. A finite element formulation

210

Tougher than Kevlar: Researchers create new high-performance fiber Posted In: Editors Picks | R&D Daily | Carbon Nanotubes & Graphene | Materials Science |  

E-Print Network (OSTI)

and satellites. To create the new fiber, researchers began with carbon nanotubes--cylindrical-shaped carbonTougher than Kevlar: Researchers create new high-performance fiber Posted In: Editors Picks | R&D Daily | Carbon Nanotubes & Graphene | Materials Science | Nanotechnology | Engineering | Material

Espinosa, Horacio D.

211

The aqueous corrosion behavior of technetium - Alloy and composite materials  

SciTech Connect

Metal waste forms are under study as possible disposal forms for technetium and other fission products. The alloying of Tc is desirable to reduce the melting point of the Tc-containing metal waste form and potentially improve its corrosion resistance. Technetium-nickel composites were made by mixing the two metal powders and pressing the mixture to make a pellet. The as-pressed composite materials were compared to sintered composites and alloys of identical composition in electrochemical corrosion tests. As-pressed samples were not robust enough for fine polishing and only a limited number of corrosion tests were performed. Alloys and composites with 10 wt% Tc appear to be more corrosion resistant at open circuit than the individual components based on linear polarization resistance and polarization data. The addition of 10 wt% Tc to Ni appears beneficial at open circuit, but detrimental upon anodic polarization. Qualitatively, the polarizations of 10 wt% Tc alloys and composites appear like crude addition of Tc plus Ni. The 1 wt% Tc alloys behave like pure Ni, but some effect of Tc is seen upon polarization. Cathodic polarization of Tc by Ni appears feasible based on open circuit potential measurements, however, zero resistance ammetry and solution measurements are necessary to confirm cathodic protection.

Jarvinen, G.; Kolman, D.; Taylor, C.; Goff, G.; Cisneros, M. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Mausolf, E.; Poineau, F.; Koury, D.; Czerwinski, K. [Department of Chemistry, University of Nevada, Las Vegas, Las Vegas, NV 89154 (United States)

2013-07-01T23:59:59.000Z

212

What is graphene?  

Science Journals Connector (OSTI)

Graphene is a 2D material with a honeycomb lattice structure made of sp2 bonded carbon atoms. Graphene is essentially the mother of all graphitic materials - it can be formed into buckyballs and nanotubes, etched into nanoribbons, or stacked into bulk ...

Raghunath Murali; James D. Meindl

2009-08-01T23:59:59.000Z

213

Embedding nano-silicon in graphene nanosheets by plasma assisted milling for high capacity anode materials in lithium ion batteries  

Science Journals Connector (OSTI)

Abstract The lithium storage performance of silicon (Si) is improved substantially by forming composite of nano-Si particles embedded homogeneously in graphene nanosheets (GNs) using a simple discharge plasma assisted milling (P-milling) method. The synergistic effect of the rapid heating of the plasma and the mechanical ball mill grinding with nano-Si as nanomiller converted the graphite powder to \\{GNs\\} with the integration of nano-Si particles in the in-situ formed GNs. This composite structure inhibits the agglomeration of nano-Si and improves electronic conductivity. The cycling stability and rate capability are enhanced, with a stable reversible capacity of 976 mAhg?1 at 50 mAg?1 for the P-milled 20 h nano-Si/GNs composite. A full cell containing a commercial LiMn2O4 cathode is assembled and demonstrated a satisfying utilization of the P-milled nano-Si/GNs composite anode with stable working potential. This composite shows promise for application in lithium ion batteries.

Wei Sun; Renzong Hu; Hui Liu; Meiqin Zeng; Lichun Yang; Haihui Wang; Min Zhu

2014-01-01T23:59:59.000Z

214

DOE/MSU composite material fatigue database: Test methods, materials, and analysis  

SciTech Connect

This report presents a detailed analysis of the results from fatigue studies of wind turbine blade composite materials carried out at Montana State University (MSU) over the last seven years. It is intended to be used in conjunction with the DOE/MSU composite Materials Fatigue Database. The fatigue testing of composite materials requires the adaptation of standard test methods to the particular composite structure of concern. The stranded fabric E-glass reinforcement used by many blade manufacturers has required the development of several test modifications to obtain valid test data for materials with particular reinforcement details, over the required range of tensile and compressive loadings. Additionally, a novel testing approach to high frequency (100 Hz) testing for high cycle fatigue using minicoupons has been developed and validated. The database for standard coupon tests now includes over 4,100 data points for over 110 materials systems. The report analyzes the database for trends and transitions in static and fatigue behavior with various materials parameters. Parameters explored are reinforcement fabric architecture, fiber content, content of fibers oriented in the load direction, matrix material, and loading parameters (tension, compression, and reversed loading). Significant transitions from good fatigue resistance to poor fatigue resistance are evident in the range of materials currently used in many blades. A preliminary evaluation of knockdowns for selected structural details is also presented. The high frequency database provides a significant set of data for various loading conditions in the longitudinal and transverse directions of unidirectional composites out to 10{sup 8} cycles. The results are expressed in stress and strain based Goodman Diagrams suitable for design. A discussion is provided to guide the user of the database in its application to blade design.

Mandell, J.F.; Samborsky, D.D. [Montana State Univ., Bozeman, MT (United States). Dept. of Chemical Engineering

1997-12-01T23:59:59.000Z

215

LiMn{sub 2}O{sub 4} nanoparticles anchored on graphene nanosheets as high-performance cathode material for lithium-ion batteries  

SciTech Connect

Nanocrystalline LiMn{sub 2}O{sub 4}/graphene nanosheets nanocomposite has been successfully synthesized by a one-step hydrothermal method without post-heat treatment. In the nanocomposite, LiMn{sub 2}O{sub 4} nanoparticles of 10–30 nm in size are well crystallized and homogeneously anchored on the graphene nanosheets. The graphene nanosheets not only provide a highly conductive matrix for LiMn{sub 2}O{sub 4} nanoparticles but also effectively reduce the agglomeration of LiMn{sub 2}O{sub 4} nanoparticles. The nanocrystalline LiMn{sub 2}O{sub 4}/graphene nanosheets nanocomposite exhibited greatly improved electrochemical performance in terms of specific capacity, cycle performance, and rate capability compared with the bare LiMn{sub 2}O{sub 4} nanoparticles. The superior electrochemical performance of the nanocrystalline LiMn{sub 2}O{sub 4}/graphene nanosheets nanocomposite makes it promising as cathode material for high-performance lithium-ion batteries. - Graphical abstract: Nanocrystalline LiMn{sub 2}O{sub 4}/graphene nanosheets (GNS) nanocomposite exhibit superior cathode performance for lithium-ion batteries compared to the bare LiMn{sub 2}O{sub 4} nanoparticles. Display Omitted - Highlights: • LiMn{sub 2}O{sub 4}/graphene nanocomposite is synthesized by a one-step hydrothermal method. • LiMn{sub 2}O{sub 4} nanoparticles are uniformly anchored on the graphene nanosheets. • The nanocomposite exhibits excellent cathode performance for lithium-ion batteries.

Lin, Binghui; Yin, Qing; Hu, Hengrun; Lu, Fujia [School of Materials Science and Engineering, Nanjing University of Science and Technology, Xiaolingwei 200, Nanjing, Jiangsu 210094 (China); Xia, Hui, E-mail: xiahui@njust.edu.cn [School of Materials Science and Engineering, Nanjing University of Science and Technology, Xiaolingwei 200, Nanjing, Jiangsu 210094 (China); Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing 210094 (China)

2014-01-15T23:59:59.000Z

216

Development and characterization of renewable resource- structural composite materials  

E-Print Network (OSTI)

Characteristics …. …. …………………. ……… …………………. ………CompositeTest Procedure …. …………………..………… 4.1 Composite ConstituentSelection …. …. ……………………………. … 4.2 Composite Processing

Cutter, Andrea Gillian

2008-01-01T23:59:59.000Z

217

Intermetallic and titanium matrix composite materials for hypersonic applications  

SciTech Connect

As part of the French Program of Research and Technology for Advanced Hypersonic Propulsion (PREPHA) which was launched in 1992 between Aerospatiale, Dassault Aviation, ONERA, SNECMA and SEP, an important work is specially devoted to the development of titanium and intermetallic composite materials for large airframe structures. At Dassault Aviation, starting from a long experience in Superplastic Forming - Diffusion Bonding (SPF-DB) of titanium parts, the effort is brought on the manufacturing and characterization of composites made from Timet beta 21S or IMI 834 foils and Textron SCS6 fiber fabrics. At `Aersopatiale Espace & Defence`, associated since a long time about intermetallic composite materials with university research laboratories, the principal effort is brought on plasma technology to develop the gamma titanium aluminide TiAl matrix composite reinforced by protected silicon carbide fibers (BP SM 1240 or TEXTRON SCS6). The objective, is to achieve, after 3 years of time, to elaborate a medium size integrally stiffened panel (300 x 600 sq mm).

Berton, B.; Surdon, G.; Colin, C. [Dassault Aviation, Saint-Cloud (France)]|[Aersopatiale Space & Defence, St Medard en Jalles (France)

1995-09-01T23:59:59.000Z

218

Composite slip table of dissimilar materials for damping longitudinal modes  

DOE Patents (OSTI)

A vibration slip table for use in a vibration testing apparatus. The table s comprised of at least three composite layers of material; a first metal layer, a second damping layer, and a third layer having a high acoustic velocity relative to the first layer. The different acoustic velocities between the first and third layers cause relative shear displacements between the layers with the second layer damping the displacements between the first and third layers to reduce the table longitudinal vibration modes.

Gregory, Danny L. (Albuquerque, NM); Priddy, Tommy G. (Albuquerque, NM); Smallwood, David O. (Albuquerque, NM); Woodall, Tommy D. (Albuquerque, NM)

1991-01-01T23:59:59.000Z

219

Bilayer Graphene Gets a Bandgap  

NLE Websites -- All DOE Office Websites (Extended Search)

Bilayer Graphene Gets a Bandgap Bilayer Graphene Gets a Bandgap Bilayer Graphene Gets a Bandgap Print Wednesday, 26 August 2009 00:00 Graphene is the two-dimensional crystalline form of carbon whose extraordinary electron mobility and other unique features hold great promise for nanoscale electronics and photonics. But without a bandgap, graphene's promise can't be realized. As with monolayer graphene, bilayer graphene also has a zero bandgap and thus behaves like a metal. But a bandgap can be introduced if an electric displacement field is applied to the two layers; the material then behaves like a semiconductor. A team of researchers from Berkeley has engineered a bandgap in bilayer graphene that can be precisely controlled from 0 to 250 meV. With precision control of its bandgap over a wide range, plus independent manipulation of its electronic states through electrical doping, dual-gated bilayer graphene becomes a remarkably flexible tool for nanoscale electronic devices.

220

Bilayer Graphene Gets a Bandgap  

NLE Websites -- All DOE Office Websites (Extended Search)

Bilayer Graphene Gets a Bandgap Bilayer Graphene Gets a Bandgap Bilayer Graphene Gets a Bandgap Print Wednesday, 26 August 2009 00:00 Graphene is the two-dimensional crystalline form of carbon whose extraordinary electron mobility and other unique features hold great promise for nanoscale electronics and photonics. But without a bandgap, graphene's promise can't be realized. As with monolayer graphene, bilayer graphene also has a zero bandgap and thus behaves like a metal. But a bandgap can be introduced if an electric displacement field is applied to the two layers; the material then behaves like a semiconductor. A team of researchers from Berkeley has engineered a bandgap in bilayer graphene that can be precisely controlled from 0 to 250 meV. With precision control of its bandgap over a wide range, plus independent manipulation of its electronic states through electrical doping, dual-gated bilayer graphene becomes a remarkably flexible tool for nanoscale electronic devices.

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Graphene Veils and Sandwiches  

Science Journals Connector (OSTI)

Graphene Veils and Sandwiches ... It readily yields stacks of graphene (or other two-dimensional sheets) separated by virtually any kind of “guest” species. ... The new material can be “sandwich like”, for which the guest species are relatively closely spaced and form a near-continuous inner layer of the sandwich, or “veil like”, where the guest species are widely separated, with each guest individually draped within a close-fitting, protective yet atomically thin graphene net or veil. ...

Jong Min Yuk; Kwanpyo Kim; Benjamín Alemán; William Regan; Ji Hoon Ryu; Jungwon Park; Peter Ercius; Hyuck Mo Lee; A. Paul Alivisatos; Michael F. Crommie; Jeong Yong Lee; Alex Zettl

2011-07-19T23:59:59.000Z

222

Long-life and high-rate LiVPO4F/C nanocrystals modified with graphene as cathode material for lithium-ion batteries  

Science Journals Connector (OSTI)

Abstract Graphene modified LiVPO4F/C nanocomposite has been firstly investigated as cathode material for lithium-ion batteries. The LiVPO4F/C nanocrystals embedded on reduced graphene oxide sheets are synthesized via a sol–gel method. The obtained sample of graphene modified LiVPO4F/C is studied comparatively with LiVPO4F/C by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectra and various electrochemical tests. The results reveal that the modification of LiVPO4F/C nanocrystals with graphene can form an effective conducting network, which can greatly improve the electronic conductivity and lithium ion transport. Thus, the as-synthesized nanocomposite exhibits excellent high-rate capability and cycling stability. In the voltage range of 3.0–4.5 V, the graphene modified LiVPO4F/C delivers a reversible discharge capacity of 151.6 (nearly to its theoretical capability of 156 mAhg? 1) and 147.8 mAhg? 1 at 0.1 and 0.5 C, respectively. It also achieves an improved cyclability with capacity retention ratio of 91.4% after 300 cycles at a higher rate of 10 C. Therefore, it is of great potential use as a cathode material in rechargeable lithium-ion batteries for hybrid-electric vehicles and electric vehicles.

Yongli Wang; Haixiang Zhao; Yongfeng Ji; Lihua Wang; Zhen Wei

2014-01-01T23:59:59.000Z

223

Genetic optimization of two-material composite laminates Laurent Grosset  

E-Print Network (OSTI)

the power of GAs for this application. COMPOSITE LAMINATE DESIGN Composite laminate optimization typically

Coello, Carlos A. Coello

224

Facile synthesis and electrochemical performances of hollow graphene spheres as anode material for lithium-ion batteries  

Science Journals Connector (OSTI)

The hollow graphene oxide spheres have been successfully fabricated from graphene oxide nanosheets utilizing a water-in-oil emulsion technique, which were prepared from natural flake graphite by oxidation and ...

Ran-Ran Yao; Dong-Lin Zhao; Li-Zhong Bai; Ning-Na Yao; Li Xu

2014-07-01T23:59:59.000Z

225

Strain Effects on Electrical Properties of Suspended Graphene.  

E-Print Network (OSTI)

?? Graphene is an extraordinary material which shows tremendous potential as a replacement for silicon in many electronic applications. However, one major drawback to graphene… (more)

Smith, Anderson David

2011-01-01T23:59:59.000Z

226

Graphene Device Fabrication and Applications in Communication Systems.  

E-Print Network (OSTI)

??High carrier mobility, saturation velocity and thermal conductivity make graphene a promising material for high-frequency, analog and communication applications. The ambipolar properties of graphene provide… (more)

Liu, Guanxiong

2012-01-01T23:59:59.000Z

227

Crown Ethers in Graphene Bring Strong, Selective Binding | ornl...  

NLE Websites -- All DOE Office Websites (Extended Search)

Materials Characterization Crown Ethers in Graphene Bring Strong, Selective Binding November 14, 2014 Schematic showing a graphene sheet containing an array of ideal crown ethers....

228

Artificial Neural Network Model for Prediction of Fatigue Lives of Composites Materials  

Science Journals Connector (OSTI)

The application of composites as engineering materials has become state of art and fatigue is one of the most complicated problems for fiber composites. The life prediction of a newly developed material is costly...

Sanjay Mathur; Prakash Chandra Gope…

2007-01-01T23:59:59.000Z

229

PneUI: Pneumatically Actuated Soft Composite Materials for Shape Changing Interfaces  

E-Print Network (OSTI)

This paper presents PneUI, an enabling technology to build shape-changing interfaces through pneumatically-actuated soft composite materials. The composite materials integrate the capabilities of both input sensing and ...

Yao, Lining

230

Edition No 14 January 2006 Rolls Royce UTC in Composite Materials  

E-Print Network (OSTI)

ME News Edition No 14 ­ January 2006 Rolls Royce UTC in Composite Materials We and Bristol are the two short-listed possible locations for a new Rolls Royce funded UTC in Composite Materials. We

231

The effects of stochastic characteristics of materials on the reliability of a composite ship hull  

Science Journals Connector (OSTI)

The effects of stochastic characteristics of materials on the reliability of ship hulls made of composite materials under longitudinal ... using reliability and sensitivity calculations of a composite ship hull w...

Wei Zhang; Wenyong Tang; Nianzhong Chen…

2011-03-01T23:59:59.000Z

232

Compositions for enhancing hydroysis of cellulosic material by cellulolytic enzyme compositions  

DOE Patents (OSTI)

The present invention relates to compositions comprising a GH61 polypeptide having cellulolytic enhancing activity and an organic compound comprising a carboxylic acid moiety, a lactone moiety, a phenolic moiety, a flavonoid moiety, or a combination thereof, wherein the combination of the GH61 polypeptide having cellulolytic enhancing activity and the organic compound enhances hydrolysis of a cellulosic material by a cellulolytic enzyme compared to the GH61 polypeptide alone or the organic compound alone. The present invention also relates to methods of using the compositions.

Quinlan, Jason; Xu, Feng; Sweeney, Matthew; Johansen, Katja Salomon

2014-09-30T23:59:59.000Z

233

Recyclable synthesis, characterization, and antimicrobial activity of chitosan-based polysaccharide composite materials  

E-Print Network (OSTI)

composite materials Chieu D. Tran, Simon Duri, April L. Harkins Department of Chemistry, Marquette to synthesize novel, biocompatible, and biodegradable composite materials from cellulose (CEL) and chitosan (CS the [CELþCS] composites. Since, the IL can be removed from the composites by washing them with water

Reid, Scott A.

234

Preparation and thermal properties of expanded graphite/paraffin/organic montmorillonite composite phase change material  

Science Journals Connector (OSTI)

Expanded graphite (EG)/paraffin/organic montmorillonite (OMMT) composite phase change material (PCM) was prepared by using melt...

Hongtao Kao; Min Li; Xuewen Lv; Jinmiao Tan

2012-01-01T23:59:59.000Z

235

Gas Separation With Graphene Membranes By Will Soutter  

E-Print Network (OSTI)

Gas Separation With Graphene Membranes By Will Soutter Introduction What is Graphene? Benefits of Graphene in Gas Separation Membranes Recent Developments Conclusion References Introduction The separation applications including fuel cells, batteries, gas sensors and gas purification. The materials

Bunch, Scott

236

Tearing Graphene Sheets From Adhesive Substrates Produces Tapered Nanoribbons  

E-Print Network (OSTI)

Thin films Tearing Graphene Sheets From Adhesive Substrates Produces Tapered Nanoribbons Dipanjan Sen, Kostya S. Novoselov, Pedro M. Reis, and Markus J. Buehler* Graphene is a truly two- film materials have been studied extensively, the key mechanical properties of graphene

Entekhabi, Dara

237

Hydroxyl-decorated graphene systems as candidates for organic metal-free ferroelectrics, multiferroics, and high-performance proton battery cathode materials  

Science Journals Connector (OSTI)

Using a first-principles method we show that graphene based materials, functionalized with hydroxyl groups, constitute a class of multifunctional, lightweight, and nontoxic organic materials with functional properties such as ferroelectricity, multiferroicity, and can be used as proton battery cathode materials. For example, the polarizations of semihydroxylized graphane and graphone, as well as fully hydroxylized graphane, are much higher than any organic ferroelectric materials known to date. Further, hydroxylized graphene nanoribbons with proton vacancies at the end can have much larger dipole moments. They may also be applied as high-capacity cathode materials with a specific capacity that is six times larger than lead-acid batteries and five times that of lithium-ion batteries.

Menghao Wu; J. D. Burton; Evgeny Y. Tsymbal; Xiao Cheng Zeng; Puru Jena

2013-02-19T23:59:59.000Z

238

ENG 4793: Composite Materials and Processes 1 Non-Destructive Testing (NDT)  

E-Print Network (OSTI)

1 ENG 4793: Composite Materials and Processes 1 Non-Destructive Testing (NDT) ver 1 ENG 4793: Composite Materials and Processes 2 Types of NDT · Visual · Ultrasonic · X-ray · Thermographic · Acoustic Emission · Eddy Current · Shearography ENG 4793: Composite Materials and Processes 3 Visual Inspection

Colton, Jonathan S.

239

An advanced 3D boundary element method for characterizations of composite materials  

E-Print Network (OSTI)

An advanced 3D boundary element method for characterizations of composite materials X.L. Chena , Y developments in the modeling of composite materials using the boundary element method (BEM) are presented in dealing with nearly-singular integrals, which arise in the BEM modeling of composite materials

Liu, Yijun

240

Materials Science and Engineering A 430 (2006) 189202 Grid indentation analysis of composite microstructure  

E-Print Network (OSTI)

Materials Science and Engineering A 430 (2006) 189­202 Grid indentation analysis of composite 17 May 2006 Abstract Several composites comprise material phases that cannot be recapitulated ex situ characteristics of naturally occurring material composites. Here, we propose a straightforward application

Van Vliet, Krystyn J.

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Composite slip table of dissimilar materials for damping longitudinal modes  

DOE Patents (OSTI)

A vibration slip table for use in a vibration testing apparatus is disclosed. The tables comprised of at least three composite layers of material; a first metal layer, a second damping layer, and a third layer having a high acoustic velocity relative to the first layer. The different acoustic velocities between the first and third layers cause relative shear displacements between the layers with the second layer damping the displacements between the first and third layers to reduce the table longitudinal vibration modes. 6 figures.

Gregory, D.L.; Priddy, T.G.; Smallwood, D.O.; Woodall, T.D.

1991-06-18T23:59:59.000Z

242

Functionalized Graphene Sheets as Molecular Templates for Controlled Nucleation and Self-Assembly of Metal Oxide-Graphene Nanocomposites  

SciTech Connect

Graphene sheets have been extensively studied as a key functional component of graphene-based nanocomposites for electronics, energy, catalysis,and sensing applications. However, fundamental understanding of the interfacial binding and nucleation processes at graphene surfaces remains lacking, and the range of controlled structures that can be produced are limited. Here, by using a combination of theoretical and experimental approaches, we demonstrate that functionalized graphene sheets (FGS) can function as a new class of molecular templates to direct nucleation and self-assembly and produce novel, three-dimensional nanocomposite materials. Two key aspects are demonstrated: First, the functional groups on FGS surface determine the nucleation energy, and thus control the nucleation sites and nucleation density, as well as the preferred crystalline phases. Second, FGS can function as a template to direct the self-assembly of surfactant micelles and produce ordered, mesoporous arrays of crystalline metal oxides and composites.

Li, Xiaolin; Qi, Wen N.; Mei, Donghai; Sushko, Maria L.; Aksay, Ilhan A.; Liu, Jun

2012-09-25T23:59:59.000Z

243

Bilayer Graphene Gets a Bandgap  

NLE Websites -- All DOE Office Websites (Extended Search)

Bilayer Graphene Gets a Bandgap Print Bilayer Graphene Gets a Bandgap Print Graphene is the two-dimensional crystalline form of carbon whose extraordinary electron mobility and other unique features hold great promise for nanoscale electronics and photonics. But without a bandgap, graphene's promise can't be realized. As with monolayer graphene, bilayer graphene also has a zero bandgap and thus behaves like a metal. But a bandgap can be introduced if an electric displacement field is applied to the two layers; the material then behaves like a semiconductor. A team of researchers from Berkeley has engineered a bandgap in bilayer graphene that can be precisely controlled from 0 to 250 meV. With precision control of its bandgap over a wide range, plus independent manipulation of its electronic states through electrical doping, dual-gated bilayer graphene becomes a remarkably flexible tool for nanoscale electronic devices.

244

Bilayer Graphene Gets a Bandgap  

NLE Websites -- All DOE Office Websites (Extended Search)

Bilayer Graphene Gets a Bandgap Print Bilayer Graphene Gets a Bandgap Print Graphene is the two-dimensional crystalline form of carbon whose extraordinary electron mobility and other unique features hold great promise for nanoscale electronics and photonics. But without a bandgap, graphene's promise can't be realized. As with monolayer graphene, bilayer graphene also has a zero bandgap and thus behaves like a metal. But a bandgap can be introduced if an electric displacement field is applied to the two layers; the material then behaves like a semiconductor. A team of researchers from Berkeley has engineered a bandgap in bilayer graphene that can be precisely controlled from 0 to 250 meV. With precision control of its bandgap over a wide range, plus independent manipulation of its electronic states through electrical doping, dual-gated bilayer graphene becomes a remarkably flexible tool for nanoscale electronic devices.

245

Bilayer Graphene Gets a Bandgap  

NLE Websites -- All DOE Office Websites (Extended Search)

Bilayer Graphene Gets a Bandgap Print Bilayer Graphene Gets a Bandgap Print Graphene is the two-dimensional crystalline form of carbon whose extraordinary electron mobility and other unique features hold great promise for nanoscale electronics and photonics. But without a bandgap, graphene's promise can't be realized. As with monolayer graphene, bilayer graphene also has a zero bandgap and thus behaves like a metal. But a bandgap can be introduced if an electric displacement field is applied to the two layers; the material then behaves like a semiconductor. A team of researchers from Berkeley has engineered a bandgap in bilayer graphene that can be precisely controlled from 0 to 250 meV. With precision control of its bandgap over a wide range, plus independent manipulation of its electronic states through electrical doping, dual-gated bilayer graphene becomes a remarkably flexible tool for nanoscale electronic devices.

246

Bilayer Graphene Gets a Bandgap  

NLE Websites -- All DOE Office Websites (Extended Search)

Bilayer Graphene Gets a Bandgap Print Bilayer Graphene Gets a Bandgap Print Graphene is the two-dimensional crystalline form of carbon whose extraordinary electron mobility and other unique features hold great promise for nanoscale electronics and photonics. But without a bandgap, graphene's promise can't be realized. As with monolayer graphene, bilayer graphene also has a zero bandgap and thus behaves like a metal. But a bandgap can be introduced if an electric displacement field is applied to the two layers; the material then behaves like a semiconductor. A team of researchers from Berkeley has engineered a bandgap in bilayer graphene that can be precisely controlled from 0 to 250 meV. With precision control of its bandgap over a wide range, plus independent manipulation of its electronic states through electrical doping, dual-gated bilayer graphene becomes a remarkably flexible tool for nanoscale electronic devices.

247

Graphene/silicon nanocomposite anode with enhanced electrochemical stability for lithium-ion battery applications  

Science Journals Connector (OSTI)

Abstract A graphene/silicon nanocomposite has been synthesized, characterized and tested as anode active material for lithium-ion batteries. A morphologically stable composite has been obtained by dispersing silicon nanoparticles in graphene oxide, previously functionalized with low-molecular weight polyacrylic acid, in eco-friendly, low-cost solvent such as ethylene glycol. The use of functionalized graphene oxide as substrate for the dispersion avoids the aggregation of silicon particles during the synthesis and decreases the detrimental effect of graphene layers re-stacking. Microwave irradiation of the suspension, inducing reduction of graphene oxide, and the following thermal annealing of the solid powder obtained by filtration, yield a graphene/silicon composite material with optimized morphology and properties. Composite anodes, prepared with high-molecular weight polyacrylic acid as green binder, exhibited high and stable reversible capacity values, of the order of 1000 mAh g?1, when cycled using vinylene carbonate as electrolyte additive. After 100 cycles at a current of 500 mA g?1, the anode showed a discharge capacity retention of about 80%. The mechanism of reversible lithium uptake is described in terms of Li–Si alloying/dealloying reaction. Comparison of the impedance responses of cells tested in electrolytes with or without vinylene carbonate confirms the beneficial effects of the additive in stabilizing the composite anode.

F. Maroni; R. Raccichini; A. Birrozzi; G. Carbonari; R. Tossici; F. Croce; R. Marassi; F. Nobili

2014-01-01T23:59:59.000Z

248

Argonne CNM Highlight: Nanopatterning of Graphene  

NLE Websites -- All DOE Office Websites (Extended Search)

Nanopatterning of Graphene Nanopatterning of Graphene Hydrogen-passivated graphene Hydrogen passivated graphene imaged and patterned at the atomic scale with STM CNM users from Politecnico di Milano in Italy, working collaboratively with researchers in the Electronic & Magnetic Materials & Devices Group, have demonstrated the reversible and local modification of the electronic properties of graphene by hydrogen passivation and subsequent electron-stimulated hydrogen desorption with a scanning tunneling microscope (STM) tip. Graphene is a nearly ideal two-dimensional conductor consisting of a single sheet of hexagonally packed carbon atoms. The hydrogen passivation modifies graphene's electronic properties, opening a gap in the local density of states. The insulating state is reversed by

249

The SNL/MSU/DOE Fatigue of Composite Materials Database: Recent Trends  

E-Print Network (OSTI)

1 The SNL/MSU/DOE Fatigue of Composite Materials Database: Recent Trends Daniel D. Samborsky1 in three areas are described for wind blade materials in the SNL/MSU/DOE fatigue of composite materials failure, epoxy based blade adhesives and core materials. Comparisons of fiber dominated and resin

250

Manganese reduction/oxidation reaction on graphene composites as a reversible process for storing enormous energy at a fast rate  

E-Print Network (OSTI)

Oxygen reduction/evolution reaction (ORR/OER) is a basic process for fuel cells or metal air batteries. However, ORR/OER generally requires noble metal catalysts and suffers from low solubility (10-3 molar per liter) of O2, low kinetics rate (10-6 cm2/s) and low reversibility. We report a manganese reduction/oxidation reaction (MRR/MOR) on graphene/MnO2 composites, delivering a high capacity (4200 mAh/g), fast kinetics (0.0024 cm2/s, three orders higher than ORR/OER), high solubility (three orders than O2), and high reversibility (100%). We further use MRR/MOR to invent a rechargeable manganese ion battery (MIB), which delivers an energy density of 1200 Wh/Kg (several times of lithium ion battery), a fast charge ability (3 minutes), and a long cycle life (10,000 cycles). MRR/MOR renders a new class of energy conversion or storage systems with a very high energy density enabling electric vehicles run much more miles at one charge.

Chen, Yanyi; Shi, Shan; Li, Jia; Kang, Feiyu; Wei, Chunguang

2014-01-01T23:59:59.000Z

251

Composites of graphene and encapsulated silicon for practically viable high-performance lithium-ion batteries  

Science Journals Connector (OSTI)

A facile and scalable approach to synthesize silicon composite anodes has been developed by encapsulating Si particles via in situ...polymerization and carbonization of phloroglucinol-formaldehyde gel, followed b...

Xin Zhao; Minjie Li; Kuo-Hsin Chang; Yu-Ming Lin

2014-10-01T23:59:59.000Z

252

Wear 252 (2002) 322331 A physically-based abrasive wear model for composite materials  

E-Print Network (OSTI)

Wear 252 (2002) 322­331 A physically-based abrasive wear model for composite materials Gun Y. Leea 2001 Abstract A simple physically-based model for the abrasive wear of composite materials is presented based on the mechanics and mechanisms associated with sliding wear in soft (ductile)- matrix composites

Ritchie, Robert

253

Single-Molecule Microscopy Studies of Electric-Field Poling in Chromophore-Polymer Composite Materials  

E-Print Network (OSTI)

Single-Molecule Microscopy Studies of Electric-Field Poling in Chromophore-Polymer Composite electrooptic devices based on chromophore-polymer composite materials is to improve chromophore ordering of susceptibility.16 Chromophore-polymer composite materials lack inherent non- centrosymmetry, which is required

Reid, Philip J.

254

Nonlinear dielectric response of periodic composite materials A. Kolpakov & A. K. Tagantsev & L. Berlyand &  

E-Print Network (OSTI)

periodic composite (a matrix of a large dielectric constant ferro- electric material with linear dielectric of ferroelectric/dielectric composites. A typical example is a (Ba,Sr)TiO3 ceramic fabricated with addition of MgNonlinear dielectric response of periodic composite materials A. Kolpakov & A. K. Tagantsev & L

Berlyand, Leonid

255

Graphene's 3D Counterpart  

NLE Websites -- All DOE Office Websites (Extended Search)

Print ALS researchers have discovered a material that is essentially a 3D version of graphene-the 2D sheets of carbon through which electrons race at many times the speed at which...

256

Graphene's 3D Counterpart  

NLE Websites -- All DOE Office Websites (Extended Search)

08:59 ALS researchers have discovered a material that is essentially a 3D version of graphene-the 2D sheets of carbon through which electrons race at many times the speed at which...

257

Carbonate-salt-based composite materials for medium- and high-temperature thermal energy storage  

Science Journals Connector (OSTI)

Abstract This paper discusses composite materials based on inorganic salts for medium- and high-temperature thermal energy storage application. The composites consist of a phase change material (PCM), a ceramic material, and a high thermal conductivity material. The ceramic material forms a microstructural skeleton for encapsulation of the PCM and structural stability of the composites; the high thermal conductivity material enhances the overall thermal conductivity of the composites. Using a eutectic salt of lithium and sodium carbonates as the PCM, magnesium oxide as the ceramic skeleton, and either graphite flakes or carbon nanotubes as the thermal conductivity enhancer, we produced composites with good physical and chemical stability and high thermal conductivity. We found that the wettability of the molten salt on the ceramic and carbon materials significantly affects the microstructure of the composites.

Zhiwei Ge; Feng Ye; Hui Cao; Guanghui Leng; Yue Qin; Yulong Ding

2014-01-01T23:59:59.000Z

258

Multifunctionality and control of the crumpling and unfolding of large-area graphene  

E-Print Network (OSTI)

Crumpled graphene films are widely used, for instance in electronics, energy storage, composites and biomedicine. Although it is known that the degree of crumpling affects graphene’s properties and the performance of ...

Zang, Jianfeng

259

Compositional Analysis of Water-Soluble Materials in Corn Stover  

SciTech Connect

Corn stover is one of the leading feedstock candidates for commodity-scale biomass-to-ethanol processing. The composition of water-soluble materials in corn stover has been determined with greater than 90% mass closure in four of five representative samples. The mass percentage of water-soluble materials in tested stover samples varied from 14 to 27% on a dry weight basis. Over 30 previously unknown constituents of aqueous extracts were identified and quantified using a variety of chromatographic techniques. Monomeric sugars (primarily glucose and fructose) were found to be the predominant water-soluble components of corn stover, accounting for 30-46% of the dry weight of extractives (4-12% of the dry weight of feedstocks). Additional constituents contributing to the mass balance for extractives included various alditols (3-7%), aliphatic acids (7-21%), inorganic ions (10-18%), oligomeric sugars (4-12%), and a distribution of oligomers tentatively identified as being derived from phenolic glycosides (10-18%).

Chen, S. F.; Mowery, R. A.; Scarlata, C. J.; Chambliss, C. K.

2007-01-01T23:59:59.000Z

260

The preparation of PANI/CA composite electrode material for supercapacitors and its electrochemical performance  

Science Journals Connector (OSTI)

Polyaniline (PANI)/carbon aerogel (CA) composite electrode materials were prepared by chemical oxidation polymerization. The morphology of PANI/CA composite was examined by scanning electron microscopy. The re...

Hongfang An; Ying Wang; Xianyou Wang; Na Li…

2010-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Numerical Simulation of Matrix Reinforced Composite Materials Subjected to Compression Loads  

Science Journals Connector (OSTI)

This paper reviews the most common formulations to obtain the compression strength of long fiber composites due to fiber buckling. This failure mode was first studied by Rosen (Fibre Composite Materials, pp. 3...

Xavier Martinez; Sergio Oller

2009-12-01T23:59:59.000Z

262

A SIMPLIFIED METHOD FOR UPSCALING COMPOSITE MATERIALS WITH HIGH CONTRAST OF THE CONDUCTIVITY  

E-Print Network (OSTI)

exchangers, are characterized by a low volume fraction of the highly conductive material (glass or metal that the composite materials have constant macroscopic thermal conductivity tensors, which in principle canA SIMPLIFIED METHOD FOR UPSCALING COMPOSITE MATERIALS WITH HIGH CONTRAST OF THE CONDUCTIVITY R

Lazarov, Raytcho

263

Synthesis and electrochemical performance of LiNi0.6Co0.2Mn0.2O2/reduced graphene oxide cathode materials for lithium-ion batteries  

Science Journals Connector (OSTI)

A LiNi0.6Co0.2Mn0.2O2/reduced graphene oxide (RGO) composite with RGO content of 1.2 % was prepared by a simple spray-drying method instead of high-energy ball milling method. The composite has been characterized...

Peng Yue; Zhixing Wang; Qian Zhang; Guochun Yan; Huajun Guo; Xinhai Li

2013-10-01T23:59:59.000Z

264

Electrical and Thermoelectrical Transport Properties of Graphene.  

E-Print Network (OSTI)

??Graphene is a newly discovered material. It has many excellent properties, which make the research of this new material very important not only for the… (more)

Wang, Deqi

2011-01-01T23:59:59.000Z

265

Multiple Layer Graphene Optical Modulator - Energy Innovation...  

NLE Websites -- All DOE Office Websites (Extended Search)

Materials Advanced Materials Find More Like This Return to Search Multiple Layer Graphene Optical Modulator Lawrence Berkeley National Laboratory Contact LBL About This...

266

Electrostatic Graphene Loudspeaker - Energy Innovation Portal  

NLE Websites -- All DOE Office Websites (Extended Search)

Materials Advanced Materials Find More Like This Return to Search Electrostatic Graphene Loudspeaker Lawrence Berkeley National Laboratory Contact LBL About This Technology...

267

Tunable Graphene Electronic Devices - Energy Innovation Portal  

NLE Websites -- All DOE Office Websites (Extended Search)

Advanced Materials Advanced Materials Find More Like This Return to Search Tunable Graphene Electronic Devices Lawrence Berkeley National Laboratory Contact LBL About This...

268

Thermal plasmonic interconnects in graphene  

Science Journals Connector (OSTI)

As one emerging plasmonic material, graphene can support surface plasmons at infrared and terahertz frequencies with unprecedented properties due to the strong interactions between graphene and low-frequency photons. Since graphene surface plasmons exist in the infrared and terahertz regime, they can be thermally pumped (excited) by the infrared evanescent waves emitted from an object. Here we show that thermal graphene plasmons can be efficiently excited and have monochromatic and tunable spectra, thus paving a way to harness thermal energy for graphene plasmonic devices. We further demonstrate that “thermal information communication” via graphene surface plasmons can be potentially realized by effectively harnessing thermal energy from various heat sources, e.g., the waste heat dissipated from nanoelectronic devices. These findings open up an avenue of thermal plasmonics based on graphene for different applications ranging from infrared emission control, to information processing and communication, to energy harvesting.

Baoan Liu; Yongmin Liu; Sheng Shen

2014-11-10T23:59:59.000Z

269

Application of the microwave technique for burning-rate measurement in high-energy composite materials  

Science Journals Connector (OSTI)

A facility designed to determine the current burning rate of high-energy composite materials is described. Methodical aspects of processing the...

A. S. Zharkov; M. G. Potapov; V. P. Lushev…

270

Multiply folded graphene  

Science Journals Connector (OSTI)

The folding of paper, hide, and woven fabric has been used for millennia to achieve enhanced articulation, curvature, and visual appeal for intrinsically flat, two-dimensional materials. For graphene, an ideal two-dimensional material, folding may transform it to complex shapes with new and distinct properties. Here, we present experimental results that folded structures in graphene, termed grafold, exist, and their formations can be controlled by introducing anisotropic surface curvature during graphene synthesis or transfer processes. Using pseudopotential-density-functional-theory calculations, we also show that double folding modifies the electronic band structure of graphene. Furthermore, we demonstrate the intercalation of C60 into the grafolds. Intercalation or functionalization of the chemically reactive folds further expands grafold's mechanical, chemical, optical, and electronic diversity.

Kwanpyo Kim; Zonghoon Lee; Brad D. Malone; Kevin T. Chan; Benjamín Alemán; William Regan; Will Gannett; M. F. Crommie; Marvin L. Cohen; A. Zettl

2011-06-27T23:59:59.000Z

271

Chitosancellulose composite for wound dressing material. Part 2. Antimicrobial activity, blood absorption ability, and biocompatibility  

E-Print Network (OSTI)

Chitosan­cellulose composite for wound dressing material. Part 2. Antimicrobial activity, blood. In this study, the novel composites containing CS and cellulose (CEL) (i.e., [CEL 1 CS]), which we have previ fibroblasts. The [CEL 1 CS] composites were found to inhibit the growth of both Gram positive and negative

Reid, Scott A.

272

Supramolecular Composite Materials from Cellulose, Chitosan, and Cyclodextrin: Facile Preparation and Their Selective Inclusion  

E-Print Network (OSTI)

Supramolecular Composite Materials from Cellulose, Chitosan, and Cyclodextrin: Facile Preparation-performance supramolecular polysaccharide composites from cellulose (CEL), chitosan (CS), and (2,3,6-tri to dissolve and prepare the composites. Because a majority (>88%) of the IL used was recovered for reuse

Reid, Scott A.

273

Durable polymer-aerogel based superhydrophobic coatings, a composite material  

DOE Patents (OSTI)

Provided are polymer-aerogel composite coatings, devices and articles including polymer-aerogel composite coatings, and methods for preparing the polymer-aerogel composite. The exemplary article can include a surface, wherein the surface includes at least one region and a polymer-aerogel composite coating disposed over the at least one region, wherein the polymer-aerogel composite coating has a water contact angle of at least about 140.degree. and a contact angle hysteresis of less than about 1.degree.. The polymer-aerogel composite coating can include a polymer and an ultra high water content catalyzed polysilicate aerogel, the polysilicate aerogel including a three dimensional network of silica particles having surface functional groups derivatized with a silylating agent and a plurality of pores.

Kissel, David J; Brinker, Charles Jeffrey

2014-03-04T23:59:59.000Z

274

Composite material having high thermal conductivity and process for fabricating same  

DOE Patents (OSTI)

A process is disclosed for fabricating a composite material such as that having high thermal conductivity and having specific application as a heat sink or heat spreader for high density integrated circuits. The composite material produced by this process has a thermal conductivity between that of diamond and copper, and basically consists of coated diamond particles dispersed in a high conductivity metal, such as copper. The composite material can be fabricated in small or relatively large sizes using inexpensive materials. The process basically consists, for example, of sputter coating diamond powder with several elements, including a carbide forming element and a brazeable material, compacting them into a porous body, and infiltrating the porous body with a suitable braze material, such as copper-silver alloy, thereby producing a dense diamond-copper composite material with a thermal conductivity comparable to synthetic diamond films at a fraction of the cost. 7 figs.

Colella, N.J.; Davidson, H.L.; Kerns, J.A.; Makowiecki, D.M.

1998-07-21T23:59:59.000Z

275

Composite material having high thermal conductivity and process for fabricating same  

DOE Patents (OSTI)

A process for fabricating a composite material such as that having high thermal conductivity and having specific application as a heat sink or heat spreader for high density integrated circuits. The composite material produced by this process has a thermal conductivity between that of diamond and copper, and basically consists of coated diamond particles dispersed in a high conductivity metal, such as copper. The composite material can be fabricated in small or relatively large sizes using inexpensive materials. The process basically consists, for example, of sputter coating diamond powder with several elements, including a carbide forming element and a brazeable material, compacting them into a porous body, and infiltrating the porous body with a suitable braze material, such as copper-silver alloy, thereby producing a dense diamond-copper composite material with a thermal conductivity comparable to synthetic diamond films at a fraction of the cost.

Colella, Nicholas J. (Livermore, CA); Davidson, Howard L. (San Carlos, CA); Kerns, John A. (Livermore, CA); Makowiecki, Daniel M. (Livermore, CA)

1998-01-01T23:59:59.000Z

276

Stochastic Simulation Model for the 3D Morphology of Composite Materials in Li-Ion Batteries  

E-Print Network (OSTI)

Stochastic Simulation Model for the 3D Morphology of Composite Materials in Li-Ion Batteries Ralf of composite materials used in Li-ion batteries. In this paper, we develop a stochastic simulation model in 3D, Stochastic Simulation Model, Structural Analysis, Marked Point Process, Germ-Grain Model, Model Fitting

Schmidt, Volker

277

A high-capacity graphene nanosheet material with capacitive characteristics for the anode of lithium-ion batteries  

Science Journals Connector (OSTI)

Graphene nanosheets are prepared from H2 thermal reduction of graphite oxide at 300 °C. The graphite oxide interlayer has readily been expanded through chemical oxidation of meso-carbon micro-beads graphite raw m...

Tian Li; Lijun Gao

2012-02-01T23:59:59.000Z

278

Development and characterization of renewable resource- structural composite materials  

E-Print Network (OSTI)

Biopolymers from Renewable Resources, D. L. Kaplan, ed. ,composites from renewable resources." Progress in PolymerBiopolymers from Renewable Resources, D. L. Kaplan, ed. ,

Cutter, Andrea Gillian

2008-01-01T23:59:59.000Z

279

Activated carbon fiber composite material and method of making  

DOE Patents (OSTI)

An activated carbon fiber composite for separation and purification, or catalytic processing of fluids is described. The activated composite comprises carbon fibers rigidly bonded to form an open, permeable, rigid monolith capable of being formed to near-net-shape. Separation and purification of gases are effected by means of a controlled pore structure that is developed in the carbon fibers contained in the composite. The open, permeable structure allows the free flow of gases through the monolith accompanied by high rates of adsorption. By modification of the pore structure and bulk density the composite can be rendered suitable for applications such as gas storage, catalysis, and liquid phase processing.

Burchell, Timothy D. (Oak Ridge, TN); Weaver, Charles E. (Knoxville, TN); Chilcoat, Bill R. (Knoxville, TN); Derbyshire, Frank (Lexington, KY); Jagtoyen, Marit (Lexington, KY)

2001-01-01T23:59:59.000Z

280

Activated carbon fiber composite material and method of making  

DOE Patents (OSTI)

An activated carbon fiber composite for separation and purification, or catalytic processing of fluids is described. The activated composite comprises carbon fibers rigidly bonded to form an open, permeable, rigid monolith capable of being formed to near-net-shape. Separation and purification of gases are effected by means of a controlled pore structure that is developed in the carbon fibers contained in the composite. The open, permeable structure allows the free flow of gases through the monolith accompanied by high rates of adsorption. By modification of the pore structure and bulk density the composite can be rendered suitable for applications such as gas storage, catalysis, and liquid phase processing.

Burchell, Timothy D. (Oak Ridge, TN); Weaver, Charles E. (Knoxville, TN); Chilcoat, Bill R. (Knoxville, TN); Derbyshire, Frank (Lexington, KY); Jagtoyen, Marit (Lexington, KY)

2000-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Composite Materials with Self-Contained Wireless Sensing Networks Kristin Schaaf, Robert Kim, and Sia Nemat-Nasser  

E-Print Network (OSTI)

Composite Materials with Self-Contained Wireless Sensing Networks Kristin Schaaf, Robert Kim efforts to develop structural composite materials which include networks of sensors with decision-making capabilities that extend the functionality of the composite materials to be information-aware. Composite panels

Nemat-Nasser, Sia

282

Technical Note Graphene: Substrate preparation and introduction  

E-Print Network (OSTI)

of Texas, Austin, TX, USA c Electron Microscopy Department of Materials Sciences, University of Ulm, Ulm September 2010 Accepted 4 October 2010 Available online xxxx Keywords: Graphene Graphene oxide Cryo-EM graphene substrates as well as their ongoing development. Ã? 2010 Elsevier Inc. All rights reserved. 1

283

Graphene-enabled Wireless Communication Networks  

E-Print Network (OSTI)

Graphene-enabled Wireless Communication Networks at the Nanoscale 1 Ignacio Llatser Nanonetworking;Graphene Honeycomb lattice of carbon atoms 2-dimensional material Discovered by A. K. Geim and K. S. Novoselov 9 Graphene G. Liu, W. Stillman, S. Rumyantsev, Q. Shao, M. Shur, A. A. Balandin, "Low

Politècnica de Catalunya, Universitat

284

Seminar -4. letnik Landau Levels in Graphene  

E-Print Network (OSTI)

Seminar - 4. letnik Landau Levels in Graphene Author: Zala Lenarcic Mentor: prof. Anton Ramsak Ljubljana, December 2010 Abstract In this seminar I present graphene, a new material with promising to graphene's unusual energy dispersion. I will derive Landau levels for standard electrons, for electrons

Ramsak, Anton

285

Crumpled graphene: Conductive inks made by startup company Vorbeck  

E-Print Network (OSTI)

Crumpled graphene: Conductive inks made by startup company Vorbeck Materials contain crumpled graphene. This atomic-force microscope image is colorized to show the topography of a piece of graphene Technology Review in English | en Español | auf Deutsch | in Italiano | Bringing Graphene to Market

Aksay, Ilhan A.

286

Production and characterization of a composite insulation material from waste polyethylene teraphtalates  

SciTech Connect

The pollution of polyethylene teraphtalate (PET) is in huge amounts due to the most widely usage as a packaging material in several industries. Regional pumice has several desirable characteristics such as porous structure, low-cost and light-weight. Considering the requirements approved by the Ministry of Public Works on isolation, composite insulation material consisting of PET and pumice was studied. Sheets of composites differing both in particle size of pumice and composition of polymer were produced by hot-molding technique. Characterization of new composite material was achieved by measuring its weight, density, flammability, endurance against both to common acids and bases, and to a force applied, heat insulation and water adsorption capacity. The results of the study showed that produced composite material is an alternative building material due to its desirable characteristics; low weight, capability of low heat conduction.

Kurtulmus, Erhan; Karaboyac?, Mustafa; Yigitarslan, Sibel [Chemical Engineering Department of Suleyman Demirel University, 32200, Isparta (Turkey)

2013-12-16T23:59:59.000Z

287

The Development of Low-Cost Integrated Composite Seal for SOFC: Materials and Design Methodologies  

SciTech Connect

This report summarizes the work conducted by UConn SOFC seal development team during the Phase I program and no cost extension. The work included composite seal sample fabrication, materials characterizations, leak testing, mechanical strength testing, chemical stability study and acoustic-based diagnostic methods. Materials characterization work revealed a set of attractive material properties including low bulk permeability, high electrical resistivity, good mechanical robustness. Composite seal samples made of a number of glasses and metallic fillers were tested for sealing performance under steady state and thermal cycling conditions. Mechanical testing included static strength (pull out) and interfacial fracture toughness measurements. Chemically stability study evaluated composite seal material stability after aging at 800 C for 168 hrs. Acoustic based diagnostic test was conducted to help detect and understand the micro-cracking processes during thermal cycling test. The composite seal concept was successfully demonstrated and a set of material (coating composition & fillers) were identified to have excellent thermal cycling performance.

Xinyu Huang; Kristoffer Ridgeway; Srivatsan Narasimhan; Serg Timin; Wei Huang; Didem Ozevin; Ken Reifsnider

2006-07-31T23:59:59.000Z

288

Microstructural Characterization of Material Properties and Damage in Asphalt Composites  

E-Print Network (OSTI)

Asphalt composites are used to construct 90% of roads in the United States. These composites consist of asphalt binder, which is a product of the refinery process of oil, aggregates, and air voids. Fatigue cracking is one of the most important...

Mohammad Khorasani, Sara

2013-05-03T23:59:59.000Z

289

Disorder-free sputtering method on graphene  

SciTech Connect

Deposition of various materials onto graphene without causing any disorder is highly desirable for graphene applications. Especially, sputtering is a versatile technique to deposit various metals and insulators for spintronics, and indium tin oxide to make transparent devices. However, the sputtering process causes damage to graphene because of high energy sputtered atoms. By flipping the substrate and using a high Ar pressure, we demonstrate that the level of damage to graphene can be reduced or eliminated in dc, rf, and reactive sputtering processes.

Qiu Xue Peng; Shin Young Jun; Niu Jing; Kulothungasagaran, Narayanapillai [Department of Electrical and Computer Engineering, National University of Singapore, 117576 (Singapore); Kalon, Gopinadhan; Yang, Hyunsoo [Department of Electrical and Computer Engineering, National University of Singapore, 117576 (Singapore); Graphene Research Centre, National University of Singapore, 117546 (Singapore); Qiu Caiyu [Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637616 (Singapore); Yu Ting [Graphene Research Centre, National University of Singapore, 117546 (Singapore); Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637616 (Singapore)

2012-09-15T23:59:59.000Z

290

GeOx/Reduced Graphene Oxide Composite as an Anode for Li-ion Batteries: Enhanced Capacity via Reversible Utilization of Li2O along with Improved Rate Performance  

SciTech Connect

A self-assembled GeOx/reduced graphene oxide (GeOx/RGO) composite, where GeOx nanoparticles were grown directly on reduced graphene oxide sheets, was synthesized via a facile one-step reduction approach and studied by X-ray diffraction, transmission electron microscopy, energy dispersive X-ray spectroscopy, electron energy loss spectroscopy elemental mapping, and other techniques. Electrochemical evaluation indicates that incorporation of reduced graphene oxide enhances both the rate capability and reversible capacity of GeOx, with the latter being due to the RGO enabling reversible utilization of Li2O. The composite delivers a high reversible capacity of 1600 mAhg-1 at a current density of 100 mAg-1, and still maintains a capacity of 410 mAhg-1 at a high current density of 20 Ag-1. Owing to the flexible reduced graphene oxide sheets enwrapping the GeOx particles, the cycling stability of the composite was also improved significantly. To further demonstrate its feasibility in practical applications, the synthesized GeOx/RGO composite anode was successfully paired with a high voltage LiNi0.5Mn1.5O4 cathode to form a full cell, which showed good cycling and rate performance.

Lv, Dongping; Gordin, Mikhail; Yi, Ran; Xu, Terrence (Tianren); Song, Jiangxuan; Jiang, Yingbing; Choi, Daiwon; Wang, Donghai

2014-09-01T23:59:59.000Z

291

Composite materials comprising two jonal functions and methods for making the same  

DOE Patents (OSTI)

The present invention generally relates to mechanisms for preventing undesirable oxidation (i.e., oxidation protection mechanisms) in composite bodies. The oxidation protection mechanisms include getterer materials which are added to the composite body which gather or scavenge undesirable oxidants which may enter the composite body. The getterer materials may be placed into at least a portion of the composite body such that any undesirable oxidant approaching, for example, a fiber reinforcement, would be scavenged by (e.g., reacted with) the getterer. The getterer materials) may form at least one compound which acts as a passivation layer, and/or is able to move by bulk transport (e.g., by viscous flow as a glassy material) to a crack, and sealing the crack, thereby further enhancing the oxidation protection of the composite body. One or more ceramic filler materials which serve as reinforcements may have a plurality of super-imposed coatings thereon, at least one of which coatings may function as or contain an oxidation protection mechanism. Specifically, a coating comprising boron nitride which has been engineered or modified to contain some silicon exhibits improved corrosion resistance, specifically to oxygen and moisture. The coated materials may be useful as reinforcing materials in high performance composites to provide improved mechanical properties such as fracture toughness. The present invention also relates to improved composites which incorporate these materials, and to their methods of manufacture.

Fareed, Ali Syed (Newark, DE); Garnier, John Edward (Newark, DE); Schiroky, Gerhard Hans (Newark, DE); Kennedy, Christopher Robin (Newark, DE); Sonuparlak, Birol (Longmont, CO)

2001-01-01T23:59:59.000Z

292

Graphene: from functionalization to devices  

Science Journals Connector (OSTI)

The year 2014 marks the first decade of the rise of graphene. Graphene, a single atomic layer of carbon atoms in sp2 bonding configuration having a honeycomb structure, has now become a well-known and well-established material. Among some of its many outstanding fundamental properties, one can mention a very high carrier mobility, a very large spin diffusion length, unsurpassed mechanical properties as graphene is the strongest material ever measured and an exceptional thermal conductivity scaling more than one order of magnitude above that of copper. After the first years of the graphene rush, graphene growth is now well controlled using various methods like epitaxial growth on silicon carbide substrate, chemical vapour deposition (CVD) or plasma techniques on metal, insulator or semiconductor substrates. More applied research is now taking over the initial studies on graphene production. Indeed, graphene is a promising material for many advanced applications such as, but not limited to, electronic, spintronics, sensors, photonics, micro/nano-electromechanical (MEMS/NEMS) systems, super-capacitors or touch-screen technologies. In this context, this Special Issue of the Journal of Physics D: Applied Physics on graphene reviews some of the recent achievements, progress and prospects in this field. It includes a collection of seventeen invited articles covering the current status and future prospects of some selected topics of strong current interest. This Special Issue is organized in four sections. The first section is dedicated to graphene devices, and opens with an article by de Heer et al on an investigation of integrating graphene devices with silicon complementary metal–oxide–semiconductor (CMOS) technology. Then, a study by Svintsov et al proposes a lateral all-graphene tunnel field-effect transistor (FET) with a high on/off current switching ratio. Next, Tsukagoshi et al present how a band-gap opening occurs in a graphene bilayer by using a perpendicular electric field to operate logic gates. Plaçais et al then show the realization of graphene microwave nano-transistors that are especially suitable for fast charge detectors. Matsumoto et al describe next some interesting graphene-based biosensor applications, while the following article by Otsuji et al shows recent advances in plasmonics in terahertz device applications. This section ends with the Dollfus et al article dealing with non-linear effects in graphene devices investigated by simulation methods. The second section concerns the electronic and transport properties and includes four articles. The first one by Gurzadyan et al provides an investigation of graphene oxide in water by femtosecond pump–probe spectroscopy to study its transient absorption properties. Jouault et al then review the quantum Hall effect of self-organized graphene monolayers epitaxially grown on the C-face of SiC. Next, Petkovic et al report on the observation of edge magneto-plasmons in graphene. Finally, Roche and Valenzuela focus on the limits of conventional views in graphene spin transport and offer novel perspectives for further progress. The third section addresses graphene tailoring and functionalization as studied by Genorio and Znidarsic for graphene nanoribbons, or by atomic intercalation as shown by the two articles from Starke and Forti, and from Bisson et al. The last section is devoted to graphene growth and morphology. Ogino et al first describe a method to grow graphene on insulating substrates using polymer films as a carbon source. Then, Suemitsu et al show the recent progresses in epitaxial graphene formation on cubic silicon carbide thin films. Finally, Norimatsu and Kusunoki investigate the structural properties and morphology of epitaxial graphene grown on hexagonal silicon carbide substrates by using a high-resolution transmission electron microscope, their article closing this Special Issue .

Antonio Tejeda; Patrick G Soukiassian

2014-01-01T23:59:59.000Z

293

Nonaqueous composition for slip casting or cold forming refractory material into solid shapes  

SciTech Connect

A composition is described for slip casting or cold forming non-oxide refractory material(s) into solid shape comprising finely divided solid refractory materials selected from the group consisting of metal boride, refractory carbide, nitride, silicide and a refractory metal of tungsten, molybdenum, tantalum and chromium suspended in a nonaqueous liquid slip composition consisting essentially of a deflocculent composed of a vinyl chloride-vinyl acetate resin dissolved in an organic solvent.

Montgomery, L.C.

1993-08-24T23:59:59.000Z

294

Nano-scaled graphene platelets with a high length-to-width aspect ratio  

DOE Patents (OSTI)

This invention provides a nano-scaled graphene platelet (NGP) having a thickness no greater than 100 nm and a length-to-width ratio no less than 3 (preferably greater than 10). The NGP with a high length-to-width ratio can be prepared by using a method comprising (a) intercalating a carbon fiber or graphite fiber with an intercalate to form an intercalated fiber; (b) exfoliating the intercalated fiber to obtain an exfoliated fiber comprising graphene sheets or flakes; and (c) separating the graphene sheets or flakes to obtain nano-scaled graphene platelets. The invention also provides a nanocomposite material comprising an NGP with a high length-to-width ratio. Such a nanocomposite can become electrically conductive with a small weight fraction of NGPs. Conductive composites are particularly useful for shielding of sensitive electronic equipment against electromagnetic interference (EMI) or radio frequency interference (RFI), and for electrostatic charge dissipation.

Zhamu, Aruna (Centerville, OH); Guo, Jiusheng (Centerville, OH); Jang, Bor Z. (Centerville, OH)

2010-09-07T23:59:59.000Z

295

Aerogels and Sol–Gel Composites as Nanostructured Energetic Materials  

Science Journals Connector (OSTI)

In the last 10 years there have been a significant number of investigations of the application of aerogels and sol–gel-derived materials and methods to the field of energetic materials (e.g., explosives, prope...

Alexander E. Gash; Randall L. Simpson; Joe H. Satcher Jr

2011-01-01T23:59:59.000Z

296

Graphene oxide oxidizes stannous ions to synthesize tin sulfidegraphene nanocomposites with small crystal size for high performance lithium ion  

E-Print Network (OSTI)

Graphene oxide oxidizes stannous ions to synthesize tin sulfide­graphene nanocomposites with small September 2012 DOI: 10.1039/c2jm34864k This study reports a novel strategy of preparing graphene composites by employing graphene oxide as precursor and oxidizer. It is demonstrated that graphene oxide can oxidize

Cao, Guozhong

297

Graphene-wrapped sulfur nanospheres with ultra-high sulfur loading for high energy density lithium–sulfur batteries  

Science Journals Connector (OSTI)

Abstract Lithium–sulfur (Li–S) battery with high theoretical energy density is one of the most promising energy storage systems for electric vehicles and intermittent renewable energy. However, due to the poor conductivity of the active material, considerable weight of the electrode is occupied by the conductive additives. Here we report a graphene-wrapped sulfur nanospheres composite (S-nanosphere@G) with sulfur content up to 91 wt% as the high energy density cathode material for Li–S battery. The sulfur nanospheres with diameter of 400–500 nm are synthesized through a solution-based approach with the existence of polyvinylpyrrolidone (PVP). Then the sulfur nanospheres are uniformly wrapped by conductive graphene sheets through the electrostatic interaction between graphene oxide and PVP, followed by reducing of graphene oxide with hydrazine. The design of graphene wrapped sulfur nanoarchitecture provides flexible conductive graphene coating with void space to accommodate the volume expansion of sulfur and to minimize polysulfide dissolution. As a result, the S-nanosphere@G nanocomposite with 91 wt% sulfur shows a reversible initial capacity of 970 mA h g?1 and an average columbic efficiency > 96% over 100 cycles at a rate of 0.2 C. Taking the total mass of electrode into account, the S-nanosphere@G composite is a promising cathode material for high energy density Li–S batteries.

Ya Liu; Jinxin Guo; Jun Zhang; Qingmei Su; Gaohui Du

2015-01-01T23:59:59.000Z

298

Mesoporous composite cathode materials prepared from inverse micelle structures for high  

E-Print Network (OSTI)

active materials in LIBs. Manganese oxide-based compounds are particularly attrac- tive as cathodes owingMesoporous composite cathode materials prepared from inverse micelle structures for highCoO2) is the most common active material.1 However, since natural deposits of cobalt are scarce

Cao, Guozhong

299

Casimir interactions between graphene sheets and metamaterials  

SciTech Connect

The Casimir force between graphene sheets and metamaterials is studied. Theoretical results based on the Lifshitz theory for layered, planar, two-dimensional systems in media are presented. We consider graphene-graphene, graphene-metamaterial, and metal-graphene-metamaterial configurations. We find that quantum effects of the temperature-dependent force are not apparent until the submicron range. In contrast to results with bulk dielectric and bulk metallic materials, no Casimir repulsion is found when graphene is placed on top of a magnetically active metamaterial substrate, regardless of the strength of the low-frequency magnetic response. In the case of the metal-graphene-metamaterial setting, repulsion between the metamaterial and the metal-graphene system is possible only when the dielectric response from the metal contributes significantly.

Drosdoff, D.; Woods, Lilia M. [Department of Physics, University of South Florida, Tampa, Florida 33620 (United States)

2011-12-15T23:59:59.000Z

300

Cleaning graphene with a titanium sacrificial layer  

SciTech Connect

Graphene is a promising material for future electronic applications and chemical vapor deposition of graphene on copper is a promising method for synthesizing graphene on the wafer scale. The processing of such graphene films into electronic devices introduces a variety of contaminants which can be difficult to remove. An approach to cleaning residues from the graphene channel is presented in which a thin layer of titanium is deposited via thermal e-beam evaporation and immediately removed. This procedure does not damage the graphene as evidenced by Raman spectroscopy, greatly enhances the electrical performance of the fabricated graphene field effect transistors, and completely removes the chemical residues from the surface of the graphene channel as evidenced by x-ray photoelectron spectroscopy.

Joiner, C. A., E-mail: cjoiner3@gatech.edu; Roy, T.; Hesabi, Z. R.; Vogel, E. M. [School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States); Chakrabarti, B. [School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States); Department of Materials Science and Engineering, The University of Texas at Dallas, Richardson, Texas 75080 (United States)

2014-06-02T23:59:59.000Z

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Simply AlF3-treated Li4Ti5O12 composite anode materials for stable...  

NLE Websites -- All DOE Office Websites (Extended Search)

Li4Ti5O12 composite anode materials for stable and ultrahigh power lithium-ion batteries. Simply AlF3-treated Li4Ti5O12 composite anode materials for stable and ultrahigh...

302

Chemistry at the Dirac Point of Graphene.  

E-Print Network (OSTI)

??Graphene holds great potential as an electronic material because of its excellent transport properties, which derive from its unique Fermi surface and ballistic conductance. It… (more)

Sarkar, Santanu

2013-01-01T23:59:59.000Z

303

Tunable Dirac Magneto-Plasmons in Graphene  

NLE Websites -- All DOE Office Websites (Extended Search)

and may allow much faster transmission of information than conventional electronics. Graphene is emerging as a very promising plasmonic material because its plasmonic frequency is...

304

Sodium sulfate–diatomite composite materials for high temperature thermal energy storage  

Science Journals Connector (OSTI)

Abstract This work explores the use of sodium sulfate and diatomite to formulate composite materials for high temperature thermal energy storage applications. Sodium sulfate in the composite functions as a phase change material (PCM) and diatomite as a structural skeleton for shape stabilization. It is found that sodium sulfate and diatomite have an excellent chemical compatibility with the PCM melting temperature at around 880 °C. It is shown that the composite containing 45% diatomite gives an optimal formulation in terms of energy density, salt leakage and mechanical strength. The results also suggest that the composite with the optimal formulation has an application window of 890–980 °C. Failures occur to the composite materials at temperatures above 1000 °C.

Yue Qin; Guanghui Leng; Xiang Yu; Hui Cao; Geng Qiao; Yunfeng Dai; Yelong Zhang; Yulong Ding

2014-01-01T23:59:59.000Z

305

Predictive Models of Biohydrogen and Biomethane Production Based on the Compositional and Structural Features of Lignocellulosic Materials  

Science Journals Connector (OSTI)

Predictive Models of Biohydrogen and Biomethane Production Based on the Compositional and Structural Features of Lignocellulosic Materials ...

Florian Monlau; Cecilia Sambusiti; Abdellatif Barakat; Xin Mei Guo; Eric Latrille; Eric Trably; Jean-Philippe Steyer; Hélène Carrere

2012-10-10T23:59:59.000Z

306

Improved method and composition for immobilization of waste in cement-based material  

DOE Patents (OSTI)

A composition and method for fixation or immobilization of aqueous hazardous waste material in cement-based materials (grout) is disclosed. The amount of drainable water in the cured grout is reduced by the addition of an ionic aluminum compound to either the waste material or the mixture of waste material and dry-solid cement- based material. This reduction in drainable water in the cured grout obviates the need for large, expensive amounts of gelling clays in grout materials and also results in improved consistency and properties of these cement-based waste disposal materials.

Tallent, O.K.; Dodson, K.E.; McDaniel, E.W.

1987-10-01T23:59:59.000Z

307

Atomistic Simulation of Graphene-Polyurethane Nanocomposite for Use in Ballistic Applications  

E-Print Network (OSTI)

to different particle velocities. This is due to graphene inducing stress concentrations in the composite, which may increase yield strength....

Njoroge, Jean L

2013-08-12T23:59:59.000Z

308

Characterization of thermo-mechanical and long-term behaviors of multi-layered composite materials  

E-Print Network (OSTI)

This study presents characterization of thermo-mechanical viscoelastic and long-term behaviors of thick-section multi-layered fiber reinforced polymer composite materials. The studied multi-layered systems belong to a class of thermo...

Nair, Aravind R.

2009-06-02T23:59:59.000Z

309

Adsorption capacity of hydrophobic SiO2 aerogel/activated carbon composite materials for TNT  

Science Journals Connector (OSTI)

The adsorption properties of TNT from wastewater by hydrophobic silica aerogel/activated carbon composite materials were investigated. The effects of adsorption time, pH value, adsorption temperature, and the ...

XiaoFang Zhou; Sheng Cui; Yu Liu; XueYong Liu…

2013-07-01T23:59:59.000Z

310

Fuel Cell Technologies Program Overview: 2012 DOE Polymer and Composite Materials Meetings  

Energy.gov (U.S. Department of Energy (DOE))

Overview of the Fuel Cell Technologies Program presented by Sunita Satyapal at the U.S. Department of Energy Polymer and Composite Materials Meetings held October 17-18, 2012, in Washington, D.C.

311

Ordered mesoporous carbon/SnO2 composites as the electrode material for supercapacitors  

Science Journals Connector (OSTI)

A series of composites as electrode materials for supercapacitors were prepared via incipient wetness impregnation method utilizing ordered mesoporous carbon (OMC) and tin (IV) oxide (SnO2) with different ratio. ...

Ping Liu ??; Bohejin Tang; Jiachang Zhao…

2011-06-01T23:59:59.000Z

312

E-Print Network 3.0 - aircraft composite materials Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Flares Summary: are burn-in-place type flares containing a combination of AgI and CaCl2 material. The Cessna 340 aircraft... with time. 7 12;Figure 5: Composite Reflectivity...

313

3D Optical Printing of Piezoelectric Nanoparticle–Polymer Composite Materials  

Science Journals Connector (OSTI)

ACS ActiveView PDFHi-Res Print, Annotate, Reference QuickView ... Here we demonstrate that efficient piezoelectric nanoparticle–polymer composite materials can be optically printed into three-dimensional (3D) microstructures using digital projection printing. ...

Kanguk Kim; Wei Zhu; Xin Qu; Chase Aaronson; William R. McCall; Shaochen Chen; Donald J. Sirbuly

2014-07-21T23:59:59.000Z

314

ARRA Material Handling Equipment Composite Data Products: Data Through Quarter 4 of 2013  

SciTech Connect

This report includes 47 composite data products (CDPs) produced for American Recovery and Reinvestment Act (ARRA) fuel cell material handling equipment, with data through the fourth quarter of 2013.

Kurtz, J.; Sprik, S.; Peters, M.

2014-06-01T23:59:59.000Z

315

LiCoO2-and LiMn2O4-based composite cathode materials  

Science Journals Connector (OSTI)

We have prepared composite cathode materials based on two electrochemically active compounds, LiCoO2 and LiMn2O4..., and investigated their properties. The results indicate that the discharge capacities of all th...

Ya. V. Shatilo; E. V. Makhonina; V. S. Pervov; V. S. Dubasova…

2006-07-01T23:59:59.000Z

316

Manufacturing and fracture of hierarchical composite materials enhanced with aligned carbon nanotubes  

E-Print Network (OSTI)

Hierarchical advanced composite structures comprised of both nano- and micro-scale fibers are currently being studied as next-generation materials for multifunctional aerospace applications. Carbon nanotubes (CNTs) are an ...

Wicks, Sunny S

2014-01-01T23:59:59.000Z

317

ARRA Material Handling Equipment Composite Data Products: Data Through Quarter 4 of 2012  

SciTech Connect

This presentation from the U.S. Department of Energy's National Renewable Energy Laboratory includes American Recovery and Reinvestment Act (ARRA) fuel cell material handling equipment composite data products for data through the fourth quarter of 2012.

Kurtz, J.; Sprik, S.; Ainscough, C.; Saur, G.; Post, M.; Peters, M.; Ramsden, T.

2013-05-01T23:59:59.000Z

318

ARRA Material Handling Equipment Composite Data Products: Data through Quarter 2 of 2013  

SciTech Connect

This report includes 47 composite data products (CDPs) produced for American Recovery and Reinvestment Act (ARRA) fuel cell material handling equipment, with data through the second quarter of 2013.

Kurtz, J.; Sprik, S.; Ainscough, C.; Saur, G.; Post, M.; Peters, M.

2013-11-01T23:59:59.000Z

319

FLUID FLOW MODELING OF RESIN TRANSFER MOLDING FOR COMPOSITE MATERIAL WIND TURBINE BLADE STRUCTURES  

E-Print Network (OSTI)

FLUID FLOW MODELING OF RESIN TRANSFER MOLDING FOR COMPOSITE MATERIAL WIND TURBINE BLADE STRUCTURES the guidance and direction provided by my advisors: Dr. Mandell, Dr. Cairns and Dr. Larsen. I would also like

320

Elizabeth. K. Ervin JAM-10-1036 1 First Principles Estimation of Shock Tube Tests on Nanoreinforced Composite Materials  

E-Print Network (OSTI)

Composite Materials Weiping Xu1 , Elizabeth K. Ervin2 1 Lecturer, Civil Engineering, Southwest Jiaotong is necessary to more rapidly address dangerous shock problems. Composite materials have replaced metals of the specific complex case of composite materials tested in a shock tube. A modal analysis simulation of a beam

Ervin, Elizabeth K.

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Composite materials non-linear modelling for long fibre-reinforced laminates  

Science Journals Connector (OSTI)

An innovative computational methodology is proposed for modelling the material non-linear mechanical behaviour of FRP structures. To model a single unidirectional composite lamina, a serial-parallel (SP) continuum approach has been developed assuming ... Keywords: Composite failure, FEM, FRP, Long fibre laminates, Non-linear modelling

Fernando Rastellini; Sergio Oller; Omar Salomón; Eugenio Oñate

2008-05-01T23:59:59.000Z

322

Opening of a PhD studentship Development and characterization of composite materials for hydrogen storage  

E-Print Network (OSTI)

and development of Hydrogen- and Fuel Cell Technologies towards European Strategy for Sustainable, CompetitiveOpening of a PhD studentship Development and characterization of composite materials for hydrogen "Demokritos", is seeking a pre-doctoral researcher to work on hydrogen storage studies in porous and composite

323

An intrinsic and objective engineering equation of state for composite materials accounting for damage and rupture  

SciTech Connect

In order to take full advantage of the rheological properties of composite materials, it is necessary to be able to predict the accumulation of damage until the onset of fracture. A material model capable of providing a reliable prediction of the non linear behavior of composite structures is presented as well as some of the validation results and a series of typical industrial applications in various industrial sectors.

Kisielewicz, L.T. [ESI Asia, Tokyo (Japan); Haug, E. [Engineering Systems International S.A., Paris (France)

1994-12-31T23:59:59.000Z

324

Nonlinear viscoelastic characterization of AS-3502 graphite/epoxy composite material  

E-Print Network (OSTI)

NONLINEAR VISCOELASTIC CHARACTERIZATION OF AS-3502 GRAPHITE/EPOXY COMPOSITE MATERIAL A Thesis MICHAEL SCOTT KERSTETTER Submitted to the Graduate College of Texas A8M University in partial fulfillment of the requirement for the degree... of MASTER OF SCIENCE December 1980 Major Subject: Aerospace Engineering NONLINEAR VISCOELASTIC CHARACTERIZATION OF AS-3502 GRAPHITE/EPOXY COMPOSITE MATERIAL A Thesis by MICHAEL SCOTT KERSTETTER Approved as to style and content by: Dr. Kenneth L...

Kerstetter, Michael Scott

2012-06-07T23:59:59.000Z

325

Characterization of Nanoscale Reinforced Polymer Composites as Active Materials  

E-Print Network (OSTI)

Single walled carbon nanotube (SWNT)-based polymer nanocomposites have generated a lot of interest as potential multifunctional materials due to the exceptional physical properties of SWNTs. To date, investigations into the electromechanical...

Deshmukh, Sujay

2012-02-14T23:59:59.000Z

326

MoS2 Nanoplates Consisting of Disordered Graphene-like Layers for High Rate Lithium Battery Anode Materials  

Science Journals Connector (OSTI)

MoS2 nanoplates, consisting of disordered graphene-like layers, with a thickness of ?30 nm were prepared by a simple, scalable, one-pot reaction using Mo(CO)6 and S in an autoclave. The product has a interlayer distance of 0.69 nm, which is much larger ...

Haesuk Hwang; Hyejung Kim; Jaephil Cho

2011-09-29T23:59:59.000Z

327

Tunable Electrochemical Properties of Fluorinated Graphene  

SciTech Connect

The structural and electrochemical properties of fluorinated graphene have been investigated by using a series of graphene fluorides (CFx, x=0.47, 0.66, 0.89). Fluorinated graphene exhibited high capacity retentions of 75-81% of theoretical capacity at moderate rates as cathode materials for primary lithium batteries. Specifically, CF0.47 maintained a capacity of 356 mAhg-1 at a 5C rate, superior to that of traditional fluorinated graphite. The discharged graphene fluorides also provide an electrochemical tool to probe the chemical bonding on the parent graphene substrate.

Meduri, Praveen; Chen, Honghao; Xiao, Jie; Martinez, Jayson J.; Carlson, Thomas J.; Zhang, Jiguang; Deng, Zhiqun

2013-06-18T23:59:59.000Z

328

Composite materials and bodies including silicon carbide and titanium diboride and methods of forming same  

DOE Patents (OSTI)

Methods of forming composite materials include coating particles of titanium dioxide with a substance including boron (e.g., boron carbide) and a substance including carbon, and reacting the titanium dioxide with the substance including boron and the substance including carbon to form titanium diboride. The methods may be used to form ceramic composite bodies and materials, such as, for example, a ceramic composite body or material including silicon carbide and titanium diboride. Such bodies and materials may be used as armor bodies and armor materials. Such methods may include forming a green body and sintering the green body to a desirable final density. Green bodies formed in accordance with such methods may include particles comprising titanium dioxide and a coating at least partially covering exterior surfaces thereof, the coating comprising a substance including boron (e.g., boron carbide) and a substance including carbon.

Lillo, Thomas M.; Chu, Henry S.; Harrison, William M.; Bailey, Derek

2013-01-22T23:59:59.000Z

329

N-Doped Graphene–VO2(B) Nanosheet-Built 3D Flower Hybrid for Lithium Ion Battery  

Science Journals Connector (OSTI)

N-Doped Graphene–VO2(B) Nanosheet-Built 3D Flower Hybrid for Lithium Ion Battery ... Graphene-based electrode materials for rechargeable lithium batteries ...

C. Nethravathi; Catherine R. Rajamathi; Michael Rajamathi; Ujjal K. Gautam; Xi Wang; Dmitri Golberg; Yoshio Bando

2013-03-13T23:59:59.000Z

330

Surface functionalization of graphene devices  

E-Print Network (OSTI)

Graphene, a zero-gap semiconductor with massless charge carriers, is emerging as an amazing material for future electronics, due to its outstanding electrical and mechanical performances. However, the lack of a bandgap ...

Zhang, Xu, S.M. Massachusetts Institute of Technology

2012-01-01T23:59:59.000Z

331

CRACKING OF CONCRETE SLABS REINFORCED WITH ADVANCED COMPOSITE MATERIALS  

E-Print Network (OSTI)

with glass fiber reinforced plastic, GFRP. Modifications are introduced to these methods to account MATERIALS Hany Abdalla, Mamdouh El-Badry Department of Civil Engineering, Concordia University, Canada and Sami Rizkalla Department of Civil Engineering, University of Manitoba, Canada Highway bridge decks

332

Active, polymer-based composite material implementing simple shear  

E-Print Network (OSTI)

Relationship..63 V ANALYSIS AND RESULTS OF SHEAR ACTUATOR ...................................64 5.1 Material Property of Hyperelastic Matrix ...............................................64 5.1.1 Simple... 5.3.1 Behavior of shear actuator when pressurized..........................135 5.3.2 Pressure vs. free strain relationship.........................................135 5.4 Numerical Analysis...

Lee, Sang Jin

2009-05-15T23:59:59.000Z

333

Adsorption of Sodium Dodecyl Sulfate on Functionalized Graphene Measured by Conductometric Titration  

E-Print Network (OSTI)

applications, including graphene-metal oxide nano- composites for Li-ion battery electrodes,4,5 grapheneAdsorption of Sodium Dodecyl Sulfate on Functionalized Graphene Measured by Conductometric States ABSTRACT: We report on the adsorption of sodium dodecyl sulfate (SDS) onto functionalized graphene

Aksay, Ilhan A.

334

Thermal protection of high temperature polymer-material-carbon fiber composites  

E-Print Network (OSTI)

Two evaporative-cooling materials were studied which are (i) salt hydrates and (ii) polyacrylic acid for the purpose showing proof of concept of being able to put evaporative-cooling materials into a composite with the Air Force polyimide AFR...

O'Neal, Justin Earl

2006-04-12T23:59:59.000Z

335

Synthesis and characterizations of graphene oxide and reduced graphene oxide nanosheets  

SciTech Connect

Interest in graphene on its excellent mechanical, electrical, thermal and optical properties, it’s very high specific surface area, and our ability to influence these properties through chemical functionalization. Chemical reduction of graphene oxide is one of the main routes of preparation for large quantities of graphenes. Hydrazine hydrate used as reducing agent to prepare for the reduced graphene oxide (RGO). There are a number of methods for generating graphene and chemically modified graphene from natural graphite flakes, graphite derivative (such as graphite oxide) and graphite interaction compounds (i.e. expandable graphite). Here we review the use of colloidal suspensions of reduced graphene oxide (RGO) with large scalable, and is adaptable to a wide variety of applications. The graphene oxide (GO) and the reduced material (RGO) were characterized by XRD, UV-Vis spectroscopy, Thermo-gravimetric analysis (TGA), Raman spectroscopy and Field emission Scanning electron microscopy (FESEM) etc.

Venkanna, M., E-mail: venkanna.pcu@gmail.com; Chakraborty, Amit K., E-mail: venkanna.pcu@gmail.com [Carbon Nanotechnology Laboratory, Department of Physics, National Institute of Technology Durgapur, M.G. Avenue, Durgapur - 713209 (India)

2014-04-24T23:59:59.000Z

336

Synthesis of carbon coated Li{sub 3}V{sub 2}(PO{sub 4}){sub 3}/reduced graphene oxide composite for high-performance lithium ion batteries  

SciTech Connect

Graphical abstract: Display Omitted Highlights: ? Carbon coated LVP nanoparticles strongly anchored on rGO surface are prepared. ? LVP@C/rGO exhibits high electrical conductivity. ? LVP@C/rGO shows excellent cycleability and rate capability between 3.0 and 4.8 V. -- Abstract: The carbon coated Li{sub 3}V{sub 2}(PO{sub 4}){sub 3}/reduced graphene oxide (LVP@C/rGO) composite is successfully synthesized by a conventional solid-state reaction, which is easily scaled up. LVP grains coated with a thin layer (?8 nm) of carbon are adhered to the surface of the rGO layer and/or enwrapped into the rGO sheets, which can facilitate the fast charge transfer within the whole electrode and to the current collector. As a cathode material, the LVP@C/rGO electrode delivers an initial discharge capacity of 177 mAh g{sup ?1} at 0.5 C with capacity retention of 96% during the 50th cycle in a wide voltage range of 3.0–4.8 V. A superior rate capability is also achieved, e.g., exhibiting a discharge capacity of 96 mAh g{sup ?1} at a high C rate of 10 C.

Wu, Keliang, E-mail: linxin66@126.com [Department of Petroleum and Chemical, Bayingolin Vocational and Technical College, Xinjiang Uygur Autonomous Region 841000 (China)] [Department of Petroleum and Chemical, Bayingolin Vocational and Technical College, Xinjiang Uygur Autonomous Region 841000 (China); Yang, Jinpeng [Department of Petroleum and Chemical, Bayingolin Vocational and Technical College, Xinjiang Uygur Autonomous Region 841000 (China)] [Department of Petroleum and Chemical, Bayingolin Vocational and Technical College, Xinjiang Uygur Autonomous Region 841000 (China)

2013-02-15T23:59:59.000Z

337

Graphene Energy | Open Energy Information  

Open Energy Info (EERE)

Graphene Energy Graphene Energy Jump to: navigation, search Name Graphene Energy Place Austin, Texas Sector Carbon Product Graphene develops nano-technology based ultracapacitors for energy storage using a unique form of carbon, called graphene, for electrode material. Coordinates 30.267605°, -97.742984° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":30.267605,"lon":-97.742984,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

338

Sulfur-Graphene Oxide Nanocomposite Cathodes for Lithium/Sulfur...  

NLE Websites -- All DOE Office Websites (Extended Search)

Advanced Materials Advanced Materials Find More Like This Return to Search Sulfur-Graphene Oxide Nanocomposite Cathodes for LithiumSulfur Cells Lawrence Berkeley National...

339

Li3V2(PO4)3/graphene nanocomposite as a high performance cathode material for lithium ion battery  

Science Journals Connector (OSTI)

Abstract In this work, pure LVP nanoparticles and an LVP/graphene nanocomposite are successfully synthesized by a simple and cost effective polyol based solvothermal method, which can be easily scaled up. The synthesized nanocomposite contained small (30–60 nm) LVP nanoparticles completely and uniformly anchored on reduced graphene nanosheets. As a cathode for lithium ion batteries, the nanocomposite electrode delivered high reversible lithium storage capacity (189.8 mA h g?1 at 0.1 C), superior cycling stability (111.8 mA h g?1 at 0.1 C, 112.6 mA h g?1 at 5 C, and 103.4 mA h g?1 at 10 C after 80 cycles) and better C-rate capability (90.8 mA h g?1 at 10 C), whereas the pure LVP nanoparticles electrode delivered much less capacity at all investigated current rates. The enhanced electrochemical performance of the nanocomposite electrode can be attributed to the synergistic interaction between the uniformly dispersed LVP nanoparticles and the graphene nanosheets, which offers a large number of accessible active sites for the fast diffusion of Li ions, low internal resistance, high conductivity and more importantly, accommodates the large volume expansion/contraction during cycling.

Alok Kumar Rai; Trang Vu Thi; Jihyeon Gim; Sungjin Kim; Jaekook Kim

2015-01-01T23:59:59.000Z

340

Potential materials for food packaging from nanoclay/natural fibres filled hybrid composites  

Science Journals Connector (OSTI)

The increasing demand for new food packaging materials which satisfy people requirements provided thrust for advancement of nano-materials science. Inherent permeability of polymeric materials to gases and vapours; and poor barrier and mechanical properties of biopolymers have boosted interest in developing new strategies to improve these properties. Research and development in polymeric materials coupled with appropriate filler, matrix-filler interaction and new formulation strategies to develop composites have potential applications in food packaging. Advancement in food packaging materials expected to grow with the advent of cheap, renewable and sustainable materials with enhanced barrier and mechanical properties. Nanoparticles have proportionally larger surface area and significant aspect ratio than their micro-scale counterparts, which promotes the development of mechanical and barrier properties. Nanocomposites are attracting considerable interest in food packaging because of these fascinating features. On the other hand, natural fibres are susceptible to microorganisms and their biodegradability is one of the most promising aspects of their incorporation in polymeric materials. Present review article explain about different categories of nanoclay and natural fibre based composite with particular regard to its applications as packaging materials and also gives an overview of the most recent advances and emerging new aspects of nanotechnology for development of hybrid composites for environmentally compatible food packaging materials.

K. Majeed; M. Jawaid; A. Hassan; A. Abu Bakar; H.P.S. Abdul Khalil; A.A. Salema; I. Inuwa

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Noncommutative Graphene  

E-Print Network (OSTI)

We consider a noncommutative description of graphene. This description consists of a Dirac equation for massless Dirac fermions plus noncommutative corrections, which are treated in the presence of an external magnetic field. We argue that, being a two-dimensional Dirac system, graphene is particularly interesting to test noncommutativity. We find that momentum noncommutativity affects the energy levels of graphene, but that it does not entail any kind of correction to the Hall conductivity.

C. Bastos; O. Bertolami; N. Dias; J. Prata

2012-07-24T23:59:59.000Z

342

Argonne CNM Highlight: Graphene Research at the Center for Nanoscale  

NLE Websites -- All DOE Office Websites (Extended Search)

Graphene Research at the Center for Nanoscale Materials Graphene Research at the Center for Nanoscale Materials graphene research The 2010 Nobel Prize in Physics was recently awarded to Andre Geim and Konstantin Novoselov from the University of Manchester "for groundbreaking experiments regarding the two-dimensional material graphene." Graphene is an extraordinary material made up of hexagonally packed carbon atoms that are sp2 bonded. A sheet of graphene is only one atom thick making it nature's version of an ideal two-dimensional material. At the Center for Nanoscale Materials we are exploring state-of-the-art synthesis, characterization, processing, and novel applications of graphene. With the highest resolution microscopes we are able to characterize the structural, electronic, and chemical properties of

343

Hierarchically Structured Ni3S2/Carbon Nanotube Composites as High Performance Cathode Materials for Asymmetric Supercapacitors  

Science Journals Connector (OSTI)

Hierarchically Structured Ni3S2/Carbon Nanotube Composites as High Performance Cathode Materials for Asymmetric Supercapacitors ... Therefore, the active surface area of the Ni3S2 nanoparticles is increased, which further enhances the capacitive performance of the composite electrode. ... nickel sulfide; carbon nanotube; composite; cathode material; asymmetric supercapacitor ...

Chao-Shuan Dai; Pei-Yi Chien; Jeng-Yu Lin; Shu-Wei Chou; Wen-Kai Wu; Ping-Hsuan Li; Kuan-Yi Wu; Tsung-Wu Lin

2013-11-05T23:59:59.000Z

344

Functionalization of Graphene and Graphene Oxide for Biosensing and Imaging  

SciTech Connect

Recent advances in our group about graphene biofunctionalization are discussed. In particular, the functionalization of graphene and graphene oxide, biosensing and bioimaging by using graphene-based nanomaterials, and some fundamental studies of graphene and graphene oxide have been summarized.

Li, Zhaohui; Wang, Ying; Du, Dan; Tang, Zhiwen; Wang, Jun; Lin, Yuehe

2011-08-15T23:59:59.000Z

345

ZnS-Graphene nanocomposite: Synthesis, characterization and optical properties  

SciTech Connect

A ZnS-Graphene nanocomposite was prepared by a facile one-step hydrothermal method using zinc nitrate hexahydrate, ethylenediamine and carbon disulfide as precursors, graphene oxide as a template. The composite was characterized by X-ray power diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, Fourier transform infrared, Raman spectra and fluorescence spectroscopy. The results show that graphene oxide was reduced to graphene in the hydrothermal reaction process. Simultaneously, the graphene sheets in the composite are exfoliated and decorated with ZnS nanoparticles. Furthermore, Raman and fluorescence properties of the composite were observed. ZnS-Graphene nanocomposite displays surface-enhanced Raman scattering activity for graphene oxide, and fluorescence enhancement property compared with pure ZnS sample. - Graphical abstract: Approach of reaction makes the reduction of grapheme oxide and the deposition of Zns on the grapheme sheets occur simultaneously and overcomes the aggregation of the grapheme sheets and Zns. Highlights: Black-Right-Pointing-Pointer Graphene oxide is reduced to graphene in the hydrothermal reaction process. Black-Right-Pointing-Pointer ZnS nanoparticles are attached onto the almost transparent graphene sheets. Black-Right-Pointing-Pointer ZnS-Graphene system shows surface-enhanced Raman scattering (SERS) activity. Black-Right-Pointing-Pointer ZnS-Graphene system displays relatively better fluorescence property than pure ZnS.

Pan Shugang [Key Laboratory for Soft Chemistry and Functional Materials, Nanjing University of Science and Technology, Ministry of Education, Nanjing 210094 (China); Liu Xiaoheng, E-mail: xhliu@mail.njust.edu.cn [Key Laboratory for Soft Chemistry and Functional Materials, Nanjing University of Science and Technology, Ministry of Education, Nanjing 210094 (China)

2012-07-15T23:59:59.000Z

346

Composite Materials under Extreme Radiation and Temperature Environments of the Next Generation Nuclear Reactors  

SciTech Connect

In the nuclear energy renaissance, driven by fission reactor concepts utilizing very high temperatures and fast neutron spectra, materials with enhanced performance that exceeds are expected to play a central role. With the operating temperatures of the Generation III reactors bringing the classical reactor materials close to their performance limits there is an urgent need to develop and qualify new alloys and composites. Efforts have been focused on the intricate relations and the high demands placed on materials at the anticipated extreme states within the next generation fusion and fission reactors which combine high radiation fluxes, elevated temperatures and aggressive environments. While nuclear reactors have been in operation for several decades, the structural materials associated with the next generation options need to endure much higher temperatures (1200 C), higher neutron doses (tens of displacements per atom, dpa), and extremely corrosive environments, which are beyond the experience on materials accumulated to-date. The most important consideration is the performance and reliability of structural materials for both in-core and out-of-core functions. While there exists a great body of nuclear materials research and operating experience/performance from fission reactors where epithermal and thermal neutrons interact with materials and alter their physio-mechanical properties, a process that is well understood by now, there are no operating or even experimental facilities that will facilitate the extreme conditions of flux and temperature anticipated and thus provide insights into the behaviour of these well understood materials. Materials, however, still need to be developed and their interaction and damage potential or lifetime to be quantified for the next generation nuclear energy. Based on material development advances, composites, and in particular ceramic composites, seem to inherently possess properties suitable for key functions within the operating envelope of both fission and fusion reactors. In advanced fission reactors composite materials are being designed in an effort to extend the life and improve the reliability of fuel rod cladding as well as structural materials. Composites are being considered for use as core internals in the next generation of gas-cooled reactors. Further, next-generation plasma-fusion reactors, such as the International Thermonuclear Experimental Reactor (ITER) will rely on the capabilities of advanced composites to safely withstand extremely high neutron fluxes while providing superior thermal shock resistance.

Simos, N.

2011-05-01T23:59:59.000Z

347

Journal of Composite Materials, July 2006, Vol. 40 no. 13, 1163-1174 1163 Thermal Expansion of Aluminum/Fly Ash Cenosphere Composites Synthesized by  

E-Print Network (OSTI)

Journal of Composite Materials, July 2006, Vol. 40 no. 13, 1163-1174 1163 Thermal Expansion of Aluminum/Fly Ash Cenosphere Composites Synthesized by Pressure Infiltration Technique P.K. Rohatgi1 , N of thermal expansions (CTEs) of commercially available pure aluminum and aluminum alloy composites containing

Gupta, Nikhil

348

Blue fluorescent organic light emitting diodes with multilayered graphene anode  

SciTech Connect

As an innovative anode for organic light emitting devices (OLEDs), we have investigated graphene films. Graphene has importance due to its huge potential in flexible OLED applications. In this work, graphene films have been catalytically grown and transferred to the glass substrate for OLED fabrications. We have successfully fabricated 2 mm × 2 mm device area blue fluorescent OLEDs with graphene anodes which showed 2.1% of external quantum efficiency at 1000 cd/m{sup 2}. This is the highest value reported among fluorescent OLEDs using graphene anodes. Oxygen plasma treatment on graphene has been found to improve hole injections in low voltage regime, which has been interpreted as oxygen plasma induced work function modification. However, plasma treatment also increases the sheet resistance of graphene, limiting the maximum luminance. In summary, our works demonstrate the practical possibility of graphene as an anode material for OLEDs and suggest a processing route which can be applied to various graphene related devices.

Hwang, Joohyun [OLED Lighting Research Team, Electronics and Telecommunications Research Institute (ETRI), Daejeon 305-700 (Korea, Republic of)] [OLED Lighting Research Team, Electronics and Telecommunications Research Institute (ETRI), Daejeon 305-700 (Korea, Republic of); Choi, Hong Kyw [Graphene Electronics Creative Research Section, Electronics and Telecommunications Research Institute (ETRI), Daejeon 305-700 (Korea, Republic of)] [Graphene Electronics Creative Research Section, Electronics and Telecommunications Research Institute (ETRI), Daejeon 305-700 (Korea, Republic of); Moon, Jaehyun; Shin, Jin-Wook; Joo, Chul Woong; Han, Jun-Han; Cho, Doo-Hee; Huh, Jin Woo [OLED Lighting Research Team, Electronics and Telecommunications Research Institute (ETRI), Daejeon 305-700 (Korea, Republic of)] [OLED Lighting Research Team, Electronics and Telecommunications Research Institute (ETRI), Daejeon 305-700 (Korea, Republic of); Choi, Sung-Yool [Graphene Electronics Creative Research Section, Electronics and Telecommunications Research Institute (ETRI), Daejeon 305-700 (Korea, Republic of)] [Graphene Electronics Creative Research Section, Electronics and Telecommunications Research Institute (ETRI), Daejeon 305-700 (Korea, Republic of); Lee, Jeong-Ik, E-mail: jiklee@etri.re.kr [OLED Lighting Research Team, Electronics and Telecommunications Research Institute (ETRI), Daejeon 305-700 (Korea, Republic of)] [OLED Lighting Research Team, Electronics and Telecommunications Research Institute (ETRI), Daejeon 305-700 (Korea, Republic of); Chu, Hye Yong [OLED Lighting Research Team, Electronics and Telecommunications Research Institute (ETRI), Daejeon 305-700 (Korea, Republic of)] [OLED Lighting Research Team, Electronics and Telecommunications Research Institute (ETRI), Daejeon 305-700 (Korea, Republic of)

2012-10-15T23:59:59.000Z

349

www.manufacturing.gatech.edu The fire, smoke and toxicity (FST) factors of composite materials are becoming  

E-Print Network (OSTI)

. Conventional methods to improve fire resistance of polymeric composite materials are expensive due to the high fireshield skins Industry Benefits New class of lightweight, low-cost, fire-resistant materials meetingwww.manufacturing.gatech.edu The fire, smoke and toxicity (FST) factors of composite materials

Das, Suman

350

Raman Nanometrology of Graphene  

E-Print Network (OSTI)

13 Optical image of the graphene layers. . . . . .Micro-Raman Spectroscopy of Grapheneand Graphene Multi-Layers . . . . Raman Spectroscopy

Calizo, Irene Gonzales

2009-01-01T23:59:59.000Z

351

The Influence of Selected Wood Characteristics and Composites Production Parameters on the Sorption Behavior of Wood Materials.  

E-Print Network (OSTI)

??The goal of this research was to investigate the influence of selected wood characteristics and composites production parameters on the sorption behavior of wood materials.… (more)

Neimsuwan, Trairat

2007-01-01T23:59:59.000Z

352

GRAPHENE RESONATORS FOR MECHANICAL SENSING , S. Najmaei2  

E-Print Network (OSTI)

GRAPHENE RESONATORS FOR MECHANICAL SENSING K. Lai1 , Z. Liu2 , S. Najmaei2 , L. Ma2 , J. Lou2 , P Department of Mechanical Engineering & Materials Science, Rice University Graphene's high conductivity, graphene resonators have been shown to have high quality (Q) factors, showing promise for use in force

Mellor-Crummey, John

353

Enhanced Half-Metallicity in Edge-Oxidized Zigzag Graphene  

E-Print Network (OSTI)

Enhanced Half-Metallicity in Edge-Oxidized Zigzag Graphene Nanoribbons Oded Hod,* Vero´nica Barone theoretical study of the electronic properties and relative stabilities of edge-oxidized zigzag graphene with nanometer scale dimen- sions. Recently, a new type of graphene-based material was experimentally realized.12

Hod, Oded

354

Scalable enhancement of graphene oxide properties by thermally driven phase  

E-Print Network (OSTI)

Scalable enhancement of graphene oxide properties by thermally driven phase transformation Priyank,2,4 * and Jeffrey C. Grossman1 * Chemical functionalization of graphene is promising for a variety of next-generation technologies. Although graphene oxide (GO) is a versatile material in this direction, its use is limited

Wu, Junqiao

355

Impermeability of graphene and its applications Vikas Berry *  

E-Print Network (OSTI)

Review Impermeability of graphene and its applications Vikas Berry * Department of Chemical T This review discusses the genesis of impermeability in graphene and its extraordinary applications in fluid rusting and environmental hazards. As the thinnest material, graphene is composed of sp2 hybridized carbon

Berry, Vikas

356

Webster 1 Proposal: Measurement of the pressure dependence of Graphene conductivity  

E-Print Network (OSTI)

Webster 1 Proposal: Measurement of the pressure dependence of Graphene conductivity Purpose called graphene [1]. Graphene is the name given to a few layers of the more commonly known material graphite. In addition to being the first two-dimensional crystal of its kind, graphene has also shown

Minnesota, University of

357

Composite material reinforced with atomized quasicrystalline particles and method of making same  

DOE Patents (OSTI)

A composite material comprises an aluminum or aluminum alloy matrix having generally spherical, atomized quasicrystalline aluminum-transition metal alloy reinforcement particles disposed in the matrix to improve mechanical properties. A composite article can be made by consolidating generally spherical, atomized quaiscrystalline aluminum-transition metal alloy particles and aluminum or aluminum alloy particles to form a body that is cold and/or hot reduced to form composite products, such as composite plate or sheet, with interfacial bonding between the quasicrystalline particles and the aluminum or aluminum alloy matrix without damage (e.g. cracking or shape change) of the reinforcement particles. The cold and/or hot worked compositehibits substantially improved yield strength, tensile strength, Young's modulus (stiffness).

Biner, Suleyman B. (Ames, IA); Sordelet, Daniel J. (Ames, IA); Lograsso, Barbara K. (Ames, IA); Anderson, Iver E. (Ames, IA)

1998-12-22T23:59:59.000Z

358

Synthesis of shape-stabilized paraffin/silicon dioxide composites as phase change material for thermal energy storage  

Science Journals Connector (OSTI)

The shape-stabilized paraffin/silicon dioxide (SiO2) composite phase change materials (PCM) were prepared by using sol– ... and silicon dioxide was acted as the supporting material. Fourier transformation infrare...

Hui Li; Guiyin Fang; Xu Liu

2010-03-01T23:59:59.000Z

359

Composition-Tailored Synthesis of Gradient Transition Metal Precursor Particles for Lithium-Ion Battery Cathode Materials  

Science Journals Connector (OSTI)

Composition-Tailored Synthesis of Gradient Transition Metal Precursor Particles for Lithium-Ion Battery Cathode Materials ... Collected particles were lithiated, and one promising material was evaluated as the active cathode component in a lithium-ion battery. ...

Gary M. Koenig, Jr.; Ilias Belharouak; Haixai Deng; Yang-Kook Sun; Khalil Amine

2011-03-09T23:59:59.000Z

360

Characterization of material degradation in ceramic matrix composites using infrared reflectance spectroscopy  

SciTech Connect

Ceramic matrix composite materials for thermal protection systems are required to maintain operational performance in extreme thermal and mechanical environments. In-service inspection of materials capable of assessing the degree and extent of damage and degradation will be required to ensure the safety and readiness of future air vehicles. Infrared reflectance spectroscopy is an established material characterization technique capable of extracting information regarding the chemical composition of substances. The viability of this technique as a potentially powerful nondestructive evaluation method capable of monitoring degradation in thermal protection system materials subjected to extreme mechanical and thermal environments is analyzed. Several oxide-based and non-oxide-based ceramic matrix composite materials were stressed to failure in a high temperature environment and subsequently measured using infrared reflectance spectroscopy. Spectral signatures at locations along the length of the samples were compared resulting in distinct and monotonic reflectance peak changes while approaching the fracture point. The chemical significance of the observed signatures and the feasibility of infrared reflectance nondestructive evaluation techniques are discussed.

Cooney, Adam T.; Flattum-Riemers, Richard Y. [Air Force Research Laboratory, Materials and Manufacturing Directorate, NonDestructive Evaluation Branch, Wright-Patterson AFB, OH (United States); Scott, Benjamin J. [Universal Technology Corporation, Dayton, OH (United States)

2011-06-23T23:59:59.000Z

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

High-performance tin oxide-nitrogen doped graphene aerogel hybrids as anode materials for lithium-ion batteries  

Science Journals Connector (OSTI)

Abstract Tin dioxide nanoparticles on nitrogen doped graphene aerogel (SnO2-NGA) hybrid are synthesized by one-step hydrothermal method and successfully applied in lithium-ion batteries as a free-standing anode. The electrochemical performance of SnO2-NGA hybrid is investigated by galvanostatic charge–discharge cycling, rate capability test, cyclic voltammetry and electrochemical impedance spectroscopy. It is found that the SnO2-NGA hybrid with freestanding spongy-like structure exhibit remarkable lithium storage capacity (1100 mAh g?1 after 100 cycles), good cycling stability and high rate capability. The outstanding performance is attributed to the uniform SnO2 nanoparticles, unique spongy-like structure and N doping defect for Li+ diffusion.

Chunhui Tan; Jing Cao; Abdul Muqsit Khattak; Feipeng Cai; Bo Jiang; Gai Yang; Suqin Hu

2014-01-01T23:59:59.000Z

362

Grain boundary loops in graphene  

Science Journals Connector (OSTI)

Topological defects can affect the physical properties of graphene in unexpected ways. Harnessing their influence may lead to enhanced control of both material strength and electrical properties. Here we present a class of topological defects in graphene composed of a rotating sequence of dislocations that close on themselves, forming grain boundary loops that either conserve the number of atoms in the hexagonal lattice or accommodate vacancy or interstitial reconstruction, while leaving no unsatisfied bonds. One grain boundary loop is observed as a “flower” pattern in scanning tunneling microscopy studies of epitaxial graphene grown on SiC(0001). We show that the flower defect has the lowest energy per dislocation core of any known topological defect in graphene, providing a natural explanation for its growth via the coalescence of mobile dislocations.

Eric Cockayne; Gregory M. Rutter; Nathan P. Guisinger; Jason N. Crain; Phillip N. First; Joseph A. Stroscio

2011-05-12T23:59:59.000Z

363

Dynamic RKKY interaction in graphene  

Science Journals Connector (OSTI)

The growing interest in carbon-based spintronics has stimulated a number of recent theoretical studies on the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction in graphene, based on which the energetically favorable alignment between magnetic moments embedded in this material can be calculated. The general consensus is that the strength of the RKKY interaction in undoped graphene decays as 1/D3 or faster, where D is the separation between magnetic moments. Such an unusually fast decay for a two-dimensional system suggests that the RKKY interaction may be too short ranged to be experimentally observed in graphene. Here we show in a mathematically transparent form that a far more long ranged interaction arises when the magnetic moments are taken out of their equilibrium positions and set in motion. We not only show that this dynamic version of the RKKY interaction in graphene decays far more slowly but also propose how it can be observed with currently available experimental methods.

S. R. Power; F. S. M. Guimarães; A. T. Costa; R. B. Muniz; M. S. Ferreira

2012-05-07T23:59:59.000Z

364

Characterization of few-layered graphene grown by carbon implantation  

SciTech Connect

Graphene is considered to be a very promising material for applications in nanotechnology. The properties of graphene are strongly dependent on defects that occur during growth and processing. These defects can be either detrimental or beneficial to device performance depending on defect type, location and device application. Here we present experimental results on formation of few-layered graphene by carbon ion implantation into nickel films and characteristics of graphene devices formed by graphene transfer and lithographic patterning. Micro-Raman spectroscopy was used to determine the number of graphene layers formed and identify defects arising from the device processing. The graphene films were cleaned by annealing in vacuum. Transport properties of cleaned graphene films were investigated by fabrication of back-gated field-effect transistors, which exhibited high hole and electron mobility of 1935 and 1905 cm2/Vs, respectively.

Lee, Kin Kiong; McCallum, Jeffrey C.; Jamieson, David N. [Centre for Quantum Computation and Communication Technology, School of Physics, The University of Melbourne, Parkville, Victoria 3010 (Australia)

2014-02-21T23:59:59.000Z

365

Preparation of carbon-coated iron oxide nanoparticles dispersed on graphene sheets and applications as advanced anode materials for lithium-ion batteries  

Science Journals Connector (OSTI)

We report a novel chemical vapor deposition (CVD) based strategy to synthesize carbon-coated Fe2O3 nanoparticles dispersed on graphene sheets (Fe2O3@C@G). Graphene sheets with high surface area and aspect...2O3.....

Huilong Fei; Zhiwei Peng; Lei Li; Yang Yang; Wei Lu; Errol L. G. Samuel…

2014-04-01T23:59:59.000Z

366

Introduction Transport in disordered graphene  

E-Print Network (OSTI)

Introduction Transport in disordered graphene Summary Ballistic transport in disordered graphene P, Gornyi, Mirlin Ballistic transport in disordered graphene #12;Introduction Transport in disordered graphene Summary Outline 1 Introduction Model Experimental motivation Transport in clean graphene 2

Fominov, Yakov

367

NEBRASKA CENTER FOR MATERIALS AND NANOSCIENCE & CENTER FOR NANOHYBRID FUNCTIONAL MATERIALS  

E-Print Network (OSTI)

NEBRASKA CENTER FOR MATERIALS AND NANOSCIENCE & CENTER FOR NANOHYBRID FUNCTIONAL MATERIALS PRESENT FOR MATERIALS AND NANOSCIENCE & CENTER FOR NANOHYBRID FUNCTIONAL MATERIALS PRESENT Graphene Colloquium

Farritor, Shane

368

Tunable fractional quantum Hall phases in bilayer graphene  

NLE Websites -- All DOE Office Websites (Extended Search)

Coulomb interactions drive the existence of a correlated many-body state. Bilayer graphene represents a particularly interesting material in which to study the fractional...

369

Electron Effective Mass in Graphene  

E-Print Network (OSTI)

The particle effective mass in graphene is a challenging concept because the commonly used theoretical expression is mathematically divergent. In this paper, we use basic principles to present a simple theoretical expression for the effective mass that is suitable for both parabolic and non-parabolic isotropic materials. We demonstrate that this definition is consistent with the definition of the cyclotron effective mass, which is one of the common methods for effective mass measurement in solid state materials. We apply the proposed theoretical definition to graphene and demonstrate linear dependence of the effective mass on momentum, as confirmed by experimental cyclotron resonance measurements. Therefore, the proposed definition of the effective mass can be used for non-parabolic materials such as graphene.

Viktor Ariel; Amir Natan

2012-06-26T23:59:59.000Z

370

Clean Energy Manufacturing Innovation Institute for Composite Materials And Structures Webinar  

Energy.gov (U.S. Department of Energy (DOE))

Slides and transcript of the webinar held on March 6th, 2014 from 3:00pm to 4:30pm EST on DE-FOA-0000977. Through this Funding Opportunity Announcement (FOA) The Advanced Manufacturing Office (AMO) of EEREseeks to establish a Clean Energy Manufacturing Innovation Institute for Composites Materials and Structures that will support U.S. prosperity and security; and contribute to the creation of the pilot National Network for Manufacturing Innovation.

371

Effect of feldspar concentrate on the chemical resistance of acid-resistant materials prepared on the basis of argillaceous materials of different chemical and mineral composition  

Science Journals Connector (OSTI)

Research shows that introduction of feldspar concentrate into the composition of ceramic mixes improves mullite crystallization, and this promotes an increase in the acid resistance of refractory materials. An in...

E. S. Abdrakhimova

2008-11-01T23:59:59.000Z

372

Graphene-encapsulated mesoporous SnO2 composites as high performance anodes for lithium-ion batteries  

Science Journals Connector (OSTI)

Mesoporous metal oxides such as SnO2...exhibit a superior electrochemical performance as anode materials for lithium-ion batteries due to their large surface areas and ... collapse during the charge–discharge pro...

Shuhua Jiang; Wenbo Yue; Ziqi Gao; Yu Ren; Hui Ma…

2013-05-01T23:59:59.000Z

373

Phonons in twisted bilayer graphene  

Science Journals Connector (OSTI)

We theoretically investigate phonon dispersion in AA-stacked, AB-stacked, and twisted bilayer graphene with various rotation angles. The calculations are performed using the Born–von Karman model for the intralayer atomic interactions and the Lennard-Jones potential for the interlayer interactions. It is found that the stacking order affects the out-of-plane acoustic phonon modes the most. The difference in the phonon densities of states in the twisted bilayer graphene and in AA- or AB-stacked bilayer graphene appears in the phonon frequency range 90–110 cm?1. Twisting bilayer graphene leads to the emergence of different phonon branches—termed hybrid folded phonons—which originate from the mixing of phonon modes from different high-symmetry directions in the Brillouin zone. The frequencies of the hybrid folded phonons depend strongly on the rotation angle and can be used for noncontact identification of the twist angles in graphene samples. The obtained results and the tabulated frequencies of phonons in twisted bilayer graphene are important for the interpretation of experimental Raman data and in determining the thermal conductivity of these material systems.

Alexandr I. Cocemasov; Denis L. Nika; Alexander A. Balandin

2013-07-15T23:59:59.000Z

374

Mesoporous MnO2/Carbon Aerogel Composites as Promising Electrode Materials for High-Performance Supercapacitors  

Science Journals Connector (OSTI)

Mesoporous MnO2/Carbon Aerogel Composites as Promising Electrode Materials for High-Performance Supercapacitors ... In this Letter, we explored a novel route to prepare mesoporous MnO2/carbon aerogel composites by electrochemical deposition assisted by gas bubbles. ... The results of nitrogen adsorption?desorption experiments and electrochemical measurements showed that these obtained mesoporous MnO2/carbon aerogel composites had a large specific surface area (120 m2/g), uniform pore-size distribution (around 5 nm), high specific capacitance (515.5 F/g), and good stability over 1000 cycles, which give these composites potential application as high-performance supercapacitor electrode materials. ...

Gao-Ren Li; Zhan-Ping Feng; Yan-Nan Ou; Dingcai Wu; Ruowen Fu; Ye-Xiang Tong

2010-01-12T23:59:59.000Z

375

A molecular dynamics study of polymer/graphene interfacial systems  

SciTech Connect

Graphene based polymer nanocomposites are hybrid materials with a very broad range of technological applications. In this work, we study three hybrid polymer/graphene interfacial systems (polystyrene/graphene, poly(methyl methacrylate)/graphene and polyethylene/graphene) through detailed atomistic molecular dynamics (MD) simulations. Density profiles, structural characteristics and mobility aspects are being examined at the molecular level for all model systems. In addition, we compare the properties of the hybrid systems to the properties of the corresponding bulk ones, as well as to theoretical predictions.

Rissanou, Anastassia N.; Harmandaris, Vagelis [Department of Mathematics and Applied Mathematics, University of Crete, GR-71409, Heraklion, Crete, Greece and Institute of Applied and Computational Mathematics (IACM), Foundation for Research and Technology Hellas (FORTH), GR-71110, Heraklion, Cret (Greece)

2014-05-15T23:59:59.000Z

376

High performance vertical tunneling diodes using graphene/hexagonal boron nitride/graphene hetero-structure  

SciTech Connect

A tunneling rectifier prepared from vertically stacked two-dimensional (2D) materials composed of chemically doped graphene electrodes and hexagonal boron nitride (h-BN) tunneling barrier was demonstrated. The asymmetric chemical doping to graphene with linear dispersion property induces rectifying behavior effectively, by facilitating Fowler-Nordheim tunneling at high forward biases. It results in excellent diode performances of a hetero-structured graphene/h-BN/graphene tunneling diode, with an asymmetric factor exceeding 1000, a nonlinearity of ?40, and a peak sensitivity of ?12?V{sup ?1}, which are superior to contending metal-insulator-metal diodes, showing great potential for future flexible and transparent electronic devices.

Hwan Lee, Seung; Lee, Jia; Ho Ra, Chang; Liu, Xiaochi; Hwang, Euyheon [Samsung-SKKU Graphene Center (SSGC), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 440-746 (Korea, Republic of); Department of Nano Science and Technology, SKKU Advanced Institute of Nano-Technology (SAINT), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 440-746 (Korea, Republic of); Sup Choi, Min [Department of Nano Science and Technology, SKKU Advanced Institute of Nano-Technology (SAINT), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 440-746 (Korea, Republic of); Center for Human Interface Nano Technology (HINT), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 440-746 (Korea, Republic of); Hee Choi, Jun [Frontier Research Laboratory, Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd., Yongin, Gyeonggi-do 446-711 (Korea, Republic of); Zhong, Jianqiang; Chen, Wei [Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542 (Singapore); Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543 (Singapore); Jong Yoo, Won, E-mail: yoowj@skku.edu [Samsung-SKKU Graphene Center (SSGC), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 440-746 (Korea, Republic of); Department of Nano Science and Technology, SKKU Advanced Institute of Nano-Technology (SAINT), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 440-746 (Korea, Republic of); Center for Human Interface Nano Technology (HINT), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 440-746 (Korea, Republic of)

2014-02-03T23:59:59.000Z

377

Superhydrophobic Functionalized Graphene Aerogels  

Science Journals Connector (OSTI)

Superhydrophobic Functionalized Graphene Aerogels ... This paper demonstrates that graphene aerogels with a silane surface modification can provide superhydrophobicity. ... Graphene aerogels of various concentrations were synthesized and the receding contact angle of a water droplet was measured. ...

Yirong Lin; Gregory J. Ehlert; Colton Bukowsky; Henry A. Sodano

2011-06-29T23:59:59.000Z

378

Dual active material composite cathode structures for Li-ion batteries  

Science Journals Connector (OSTI)

The efficacy of composite Li-ion battery cathodes made by mixing active materials that possessed either high-rate capability or high specific energy was examined. The cathode structures studied contained carbon-coated LiFePO4 and either Li[Li0.17Mn0.58Ni0.25]O2 or LiCoO2. These active materials were arranged using three different electrode geometries: fully intermixed, fully separated, or layered. Discharge rate studies, cycle-life evaluation, and electrochemical impedance spectroscopy studies were conducted using coin cell test structures containing Li-metal anodes. Results indicated that electrode configuration was correlated to rate capability and degree of polarization if there was a large differential between the rate capabilities of the two active material species.

J.F. Whitacre; K. Zaghib; W.C. West; B.V. Ratnakumar

2008-01-01T23:59:59.000Z

379

Carbon-Carbon Composites as Recuperator Material for Direct Gas Brayton Systems  

SciTech Connect

Of the numerous energy conversion options available for a space nuclear power plant (SNPP), one that shows promise in attaining reliable operation and high efficiency is the direct gas Brayton (GB) system. In order to increase efficiency, the GB system incorporates a recuperator that accounts for nearly half the weight of the energy conversion system (ECS). Therefore, development of a recuperator that is lighter and provides better performance than current heat exchangers could prove to be advantageous. The feasibility of a carbon-carbon (C/C) composite recuperator core has been assessed and a mass savings of 60% and volume penalty of 20% were projected. The excellent thermal properties, high-temperature capabilities, and low density of carbon-carbon materials make them attractive in the GB system, but development issues such as material compatibility with other structural materials in the system, such as refractory metals and superalloys, permeability, corrosion, joining, and fabrication must be addressed.

RA Wolf

2006-07-19T23:59:59.000Z

380

Thermal Conductivity of Thermally-Isolating Polymeric and Composite Structural Support Materials Between 0.3 and 4 K  

E-Print Network (OSTI)

We present measurements of the low-temperature thermal conductivity of a number of polymeric and composite materials from 0.3 to 4 K. The materials measured are Vespel SP-1, Vespel SP-22, unfilled PEEK, 30% carbon fiber-filled PEEK, 30% glass-filled PEEK, carbon fiber Graphlite composite rod, Torlon 4301, G-10/FR-4 fiberglass, pultruded fiberglass composite, Macor ceramic, and graphite rod. These materials have moderate to high elastic moduli making them useful for thermally-isolating structural supports.

M. C. Runyan; W. C. Jones

2008-06-11T23:59:59.000Z

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Thermal Conductivity of Thermally-Isolating Polymeric and Composite Structural Support Materials Between 0.3 and 4 K  

E-Print Network (OSTI)

We present measurements of the low-temperature thermal conductivity of a number of polymeric and composite materials from 0.3 to 4 K. The materials measured are Vespel SP-1, Vespel SP-22, unfilled PEEK, 30% carbon fiber-filled PEEK, 30% glass-filled PEEK, carbon fiber Graphlite composite rod, Torlon 4301, G-10/FR-4 fiberglass, pultruded fiberglass composite, Macor ceramic, and graphite rod. These materials have moderate to high elastic moduli making them useful for thermally-isolating structural supports.

Runyan, M C

2008-01-01T23:59:59.000Z

382

Co3O4 nanocubes homogeneously assembled on few-layer graphene for high energy density lithium-ion batteries  

Science Journals Connector (OSTI)

Abstract Graphene-based nanocomposites have been synthesized and tested as electrode materials for high power lithium-ion batteries. In the synthesis of such nanocomposites, graphene is generally introduced by either thermally or chemically reduced graphite oxide (GO), which has poorer electric conductivity and crystallinity than mechanically exfoliated graphene. Here, we prepare few-layer graphene sheet (FLGS) with high electric conductivity, by sonicating expanded graphite in DMF solvent, and develop a simple one-pot hydrothermal method to fabricate monodispersed and ultrasmall Co3O4 nanocubes (about 4 nm in size) on the FLGS. This composite, consisting of homogeneously assembled and high crystalline Co3O4 nanocubes on the FLGS, has shown higher capacity and much better cycling stability than counterparts synthesized using GO as a precursor. The products in different synthesis stages have been characterized by TEM, FTIR and XPS to investigate the nanocube growth mechanism. We find that Co(OH)2 initially grew homogeneously on the graphene surface, then gradually oxidized to form Co3O4 nanoparticle seeds, and finally converted to Co3O4 nanocubes with caboxylated anion as surfactant. This work explores the mechanism of nanocrystal growth and its impact on electrochemical properties to provide further insights into the development of nanostructured electrode materials for high power energy storage.

Junming Xu; Jinsong Wu; Langli Luo; Xinqi Chen; Huibin Qin; Vinayak Dravid; Shaobo Mi; Chunlin Jia

2015-01-01T23:59:59.000Z

383

A Roadmap for Engineering Piezoelectricity in Graphene  

NLE Websites -- All DOE Office Websites (Extended Search)

Roadmap for Roadmap for Engineering Piezoelectricity in Graphene A Roadmap for Engineering Piezoelectricity in Graphene Doping this 'Miracle Material' May Lead to New Array of Nanoscale Devices, Simulations Reveal February 23, 2012 | Tags: Carver, Chemistry, Franklin, Materials Science Linda Vu, lvu@lbl.gov, +1 510 495 2402 This illustration shows lithium atoms (red) dopped on graphene (black hexagons) and generating electricity. Graphic courtesy of Mitchell Ong, Stanford University. Some scientists refer to graphene as the "miracle material" of the 21st century. Composed of a single sheet of carbon atoms, this material is tougher than diamond, more conductive than copper, and has potential applications in a variety of technologies. Now with the help of supercomputers at the Department of Energy's

384

Electrical and Mechanical Properties of Graphene.  

E-Print Network (OSTI)

??Graphene is an exciting new atomically-thin two-dimensional (2D) system of carbon atoms organized in a hexagonal lattice structure. This "wonder material" has been extensively studied… (more)

Bao, Wenzhong

2011-01-01T23:59:59.000Z

385

Electrical Transport in Carbon Nanotubes and Graphene  

E-Print Network (OSTI)

nanotubes and graphene are the most popular Carbon material in the condensed matter research. Based on energy2D energy dispersion as Fig. II-2. For a nanotubes in

Liu, Gang

2010-01-01T23:59:59.000Z

386

Detecting topological currents in graphene superlattices  

E-Print Network (OSTI)

Topological materials may exhibit Hall-like currents flowing transversely to the applied electric field even in the absence of a magnetic field. In graphene superlattices, which have broken inversion symmetry, topological ...

Gorbachev, R. V.

387

Duality of the Interfacial Thermal Conductance in Graphene-based Nanocomposites  

SciTech Connect

The thermal conductance of graphene-matrix interfaces plays a key role in controlling the thermal transport properties of graphene-based nanocomposites. Using classical molecular dynamics simulations, we found that the interfacial thermal conductance depends strongly on the mode of heat transfer at the graphene-matrix interfaces: if heat enters graphene from one side of its basal plane and immediately leaves the graphene through the other side, the corresponding interfacial thermal conductance, G(across), is large; if heat enters graphene from both sides of its basal plane and leaves the graphene at a position far away on its basal plane, the corresponding interfacial thermal conductance, G(non-across), is small. For a single-layer graphene immersed in liquid octane, G(across) is ~150 MW/m2K while Gnon-across is ~5 MW/m2K. G(across) decreases with increasing multi-layer graphene thickness (i.e., number of layers in graphene) and approaches an asymptotic value of 100 MW/m2K for 7-layer graphenes. G(non-across) increases only marginally as the graphene sheet thickness increases. Such a duality of the interface thermal conductance for different probing methods and its dependence on graphene sheet thickness can be traced ultimately to the unique physical and chemical structure of graphene materials. The ramifications of these results in areas such as experimental measurement of thermal conductivity of graphene and the design of graphene-based thermal nanocomposites are discussed.

Liu, Ying [Clemson University] [Clemson University; Huang, Jingsong [ORNL] [ORNL; Yang, Bao [University of Maryland] [University of Maryland; Sumpter, Bobby G [ORNL] [ORNL; Qiao, Rui [Clemson University] [Clemson University

2014-01-01T23:59:59.000Z

388

Silica Polyamine Composites: New Supramolecular Materials for Cation and Anion Recovery and Remediation  

SciTech Connect

The surface coverage of amorphous silica gels used in the synthesis of silica polyamine composites has been investigated by 29Si NMR. By diluting the polyamine anchor silane, chloropropyl trichlorosilane, with methyl trichlorosilane it was found that surface coverage could be markedly improved for a range of amine polymers after grafting to the silica surface. The commensurate decrease in the number of anchor points and increase in the number of free amines results in an increase in metal capacity and/or an improvement in capture kinetics. Solid state CPMAS-13C NMR has been employed to investigate the structure and metal ion binding of a series of these composite materials. It is reported that the highly branched polymer, poly(ethyleneimine) (PEI) exhibits much broader 13C NMR resonances than the linear polymers poly(allylamine) (PAA) and poly(vinylamine) (PVA). These results are understood in terms of the low energy conformations calculated from molecular modeling studies. Three new applications of the technology are also presented: (1) separation of lanthanides as a group from ferric ion and all other divalent ions; (2) a multi step process for recovering and concentrating the valuable metals in acid mine drainage; (3) a process for removing low level arsenic and selenium in the presence of sulfate using immobilized cations on the composite materials.

Hughes, Mark; Miranda, Paul; Nielsen, Daniel J.; Rosenberg, Edward; Gobetto, Roberto; Viale, Alessandra; Burton, Sarah D.

2006-03-01T23:59:59.000Z

389

Single-layer graphene cathodes for organic photovoltaics Marshall Cox,1,a  

E-Print Network (OSTI)

using graphene as the cathode material. © 2011 American Institute of Physics. doi:10 study that has utilized graphene as a cathode material.15 In this work, multilayer graphene modified as a cathode, yielding an active area of 0.16 cm2 . I-V measurements were performed under AM 1.5 solar simu

Kim, Philip

390

Controlling Graphene's Electronic Structure  

NLE Websites -- All DOE Office Websites (Extended Search)

Controlling Graphene's Electronic Structure Print Graphene, because of its unusual electron properties, reduced dimensionality, and scale, has enormous potential for use in...

391

Controlling Graphene's Electronic Structure  

NLE Websites -- All DOE Office Websites (Extended Search)

Controlling Graphene's Electronic Structure Print Wednesday, 25 April 2007 00:00 Graphene, because of its unusual electron properties, reduced dimensionality, and scale, has...

392

Linear Graphene Plasmons  

Science Journals Connector (OSTI)

The coupling of the plasmon spectra of graphene and a nearby thick plasma is examined here in detail. The coupled modes include linear plasmons. Keywords: Graphene, plasmons, surface

N. J.M. Horing

2010-11-01T23:59:59.000Z

393

Electronic Transport in Graphene  

Science Journals Connector (OSTI)

This chapter provides an experimental overview of the electrical transport properties of graphene and graphene nanoribbons, focusing on phenomena related to electronics ... and compares the characteristics of exf...

Jun Zhu

2012-01-01T23:59:59.000Z

394

Amylopectin Wrapped Graphene Oxide/Sulfur for Improved Cyclability of Lithium–Sulfur Battery  

Science Journals Connector (OSTI)

Amylopectin Wrapped Graphene Oxide/Sulfur for Improved Cyclability of Lithium–Sulfur Battery ... An amylopectin wrapped graphene oxide-sulfur composite was prepared to construct a 3-dimensionally cross-linked structure through the interaction between amylopectin and graphene oxide, for stabilizing lithium sulfur batteries. ...

Weidong Zhou; Hao Chen; Yingchao Yu; Deli Wang; Zhiming Cui; Francis J. DiSalvo; Héctor D. Abruña

2013-09-05T23:59:59.000Z

395

CoFe2O4-Graphene Nanocomposites Synthesized through An Ultrasonic Method with Enhanced Performances as Anode Materials for Li-ion Batteries  

Science Journals Connector (OSTI)

CoFe2O4-graphene nanosheets (CoFe2O4...-GNSs) were synthesized through an ultrasonic method, and their electrochemical performances as Li-ion battery electrode were improved by annealing processes. The...?1 even ...

Yinglin Xiao; Xiaomin Li; Jiantao Zai; Kaixue Wang; Yong Gong; Bo Li…

2014-10-01T23:59:59.000Z

396

Synthesis Of Nitrogen-Doped Graphene Films For Lithium Battery Application  

Science Journals Connector (OSTI)

Synthesis Of Nitrogen-Doped Graphene Films For Lithium Battery Application ... Fabrication of Nitrogen-Doped Holey Graphene Hollow Microspheres and Their Use as an Active Electrode Material for Lithium Ion Batteries ...

Arava Leela Mohana Reddy; Anchal Srivastava; Sanketh R. Gowda; Hemtej Gullapalli; Madan Dubey; Pulickel M. Ajayan

2010-10-08T23:59:59.000Z

397

Amazing Materials and the Emerging Field of Spintronics | Department...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

a 3D counterpart to one of the flattest materials of them all -- the amazing material graphene. Graphene is effectively a 2D material, consisting of single layers of carbon atoms...

398

Synthesis of composite hydrogels incorporating D,L-cyclic peptide nanotubes as a platform for materials engineering  

E-Print Network (OSTI)

Composite hydrogels find increasing use as biomaterials because the addition of a filler often improves on the material properties of the original matrix, or provides new optical, magnetic, conductive or bioactive ...

Tay, Pei Kun Richie

2012-01-01T23:59:59.000Z

399

Development of a new light-weight car audio using polycarbonate/acrylonitrile-butadiene-styrene copolymer composite based hybrid material  

Science Journals Connector (OSTI)

Engineering plastics have been applied to automobile components ... /ABS) based composite material to the car audio chassis was investigated with respect to the key properties of a car audio chassis mainly throug...

Seong-Ho Jeon; Woo Chun Choi; Tae-Hong Park…

2012-01-01T23:59:59.000Z

400

Phosphazene groups modified sulfur composites as active cathode materials for rechargeable lithium/sulfur batteries  

Science Journals Connector (OSTI)

A novel phosphazene groups modified sulfur composites cathode [triphosphazene sulfide composite (PS) or nitroaniline–triphosphazene disulfide composite (NPS)] which can give good affinity with electrolytes was...

J. D. Liu; S. Q. Zhang; S. B. Yang; Z. F. Shi; S. T. Zhang; L. K. Wu

2013-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Use Of Superacids To Digest Chrysotile And Amosite Asbestos In Simple Mixtures Or Matrices Found In Building Materials Compositions  

DOE Patents (OSTI)

A composition for converting asbestos-containing material to environmentally benign components is provided. The composition comprises a flouro acid decomposing agent which can be applied to either amosite-containing thermal insulation or chrysotile-containing fire-proof material or to any asbestos-containing material which includes of chrysotile and amosite asbestos. The fluoro acid decomposing agent includes FP(O)(OH).sub.2, hexafluorophosphoric acid, a mixture of hydrofluoric and phosphoric acid and a mixture of hexafluorophosphoric acid and phosphoric acid. A method for converting asbestos-containing material to environmentally benign components is also provided

Sugama, Toshifumi (Wading River, NY); Petrakis, Leon (Port Jefferson, NY); Webster, Ronald P. (Shoreham, NY)

1999-12-21T23:59:59.000Z

402

Effect of composition and heat treatment on MnBi magnetic materials  

SciTech Connect

The metallic compound MnBi is a promising rare-earth-free permanent magnet material, unique among all candidates for its high intrinsic coercivity (Hci) and its large positive temperature coefficient. The Hci of MnBi in thin-film or powder form can exceed 12 and 26 kOe at 300 and 523 K, respectively. Such a steep rise in Hci with increasing temperature is unique to MnBi. Consequently, MnBi is a highly sought-after hard phase for exchange coupling nanocomposite magnets. However, the reaction between Mn and Bi is peritectic, and hence Mn tends to precipitate out of the MnBi liquid during the solidification process. As result, when the alloy is prepared using conventional induction or arc-melting casting methods, additional Mn is required to compensate the precipitation of Mn. In addition to composition, post-casting annealing plays an important role in obtaining a high content of MnBi low-temperature phase (LTP) because the annealing encourages the Mn precipitates and the unreacted Bi to react, forming the desired LTP phase. Here we report a systematic study of the effect of composition and heat treatments on the phase content and magnetic properties of Mn–Bi alloys. In this study, 14 compositions were prepared using conventional metallurgical methods, and the compositions, crystal structures, phase content and magnetic properties of the resulting alloys were analyzed. The results show that the composition with 55 at.% Mn exhibits both the highest LTP content (93 wt.%) and magnetization (74 emu g?1 with 9 T applied field at 300 K).

Cui, Jun [Pacific Northwest National Laboratory; Choi, Jung-Pyung [Pacific Northwest National Laboratory; Polikarpov, Evgueni [Pacific Northwest National Laboratory; Bowden, Mark E [Pacific Northwest National Laboratory; Xie, Wei [Pacific Northwest National Laboratory; Li, Guosheng [Pacific Northwest National Laboratory; Nie, Zimin [Pacific Northwest National Laboratory; Zarkevich, Nikolai [Ames Laboratory; Kramer, Matthew J [Ames Laboratory; Johnson, Duane [Ames Laboratory

2014-10-01T23:59:59.000Z

403

An experimental investigation of damage-dependent material damping of laminated composites  

E-Print Network (OSTI)

Composites. (May 1988) Scott Andrew Smith, B. S. , Texas A&M University Co-Chairs of Advisory Committee: Dr. Alton L. Highsmith Dr. Charles E. Harris An experimental program was developed in which the material damping of laminated graphite... for Undamaged and Damaged Graphite/Epoxy Laminates. . . . . . . . . LIST OF TABLES Table Page 1 Lamina Properties for AS4/3502 Graphite/Epoxy. . . . 13 2 AS4/3502 Laminate Types Testes. . . 13 3 Damping Results for [0]s and [90]s Laminates...

Smith, Scott Andrew

2012-06-07T23:59:59.000Z

404

Method and apparatus for analyzing the internal chemistry and compositional variations of materials and devices  

DOE Patents (OSTI)

A method and apparatus is disclosed for obtaining and mapping chemical compositional data for solid devices. It includes a SIMS mass analyzer or similar system capable of being rastered over a surface of the solid to sample the material at a pattern of selected points, as the surface is being eroded away by sputtering or a similar process. The data for each point sampled in a volume of the solid is digitally processed and indexed by element or molecule type, exact spacial location within the volume, and the concentration levels of the detected element or molecule types. This data can then be recalled and displayed for any desired planar view in the volume.

Kazmerski, L.L.

1985-04-30T23:59:59.000Z

405

Method and apparatus for analyzing the internal chemistry and compositional variations of materials and devices  

DOE Patents (OSTI)

A method and apparatus is disclosed for obtaining and mapping chemical compositional data for solid devices. It includes a SIMS mass analyzer or similar system capable of being rastered over a surface of the solid to sample the material at a pattern of selected points, as the surface is being eroded away by sputtering or a similar process. The data for each point sampled in a volume of the solid is digitally processed and indexed by element or molecule type, exact spacial location within the volume, and the concentration levels of the detected element or molecule types. This data can then be recalled and displayed for any desired planar view in the volume.

Kazmerski, Lawrence L. (Lakewood, CO)

1989-01-01T23:59:59.000Z

406

Experimentally measured thermal transport properties of aluminum–polytetrafluoroethylene nanocomposites with graphene and carbon nanotube additives  

Science Journals Connector (OSTI)

Reactive materials such as aluminum (Al) and polytetrafluoroethylene (Teflon) are used for energy generation applications and specifically in ordnance technologies. With the advent of nanotechnology various nano-scale additives have become incorporated into reactive material formulations with the hope of enhanced performance. An important component to the study of energy generation is an examination of energy transport through a reactant matrix. This study examines an experimental approach to quantifying thermal properties of an Al/Teflon nanocomposite reactant matrix that has been impregnated with carbon additives. Various structures of carbon are investigated and include amorphous nanoscale carbon spheres (nano C), graphene flakes and unaligned multiwalled carbon nanotubes (CNTs). The additives were selected based on their completely different structures with the hypothesis that the structure of the additive will influence the thermal transport properties of the matrix. Results show graphene has the greatest influence on the thermophysical properties. For example, thermal conductivity of the composites containing graphene increased by 98%. Graphene similarly enhanced the thermal diffusivity and specific heat of the Al/Teflon matrix. Conversely, nano C and \\{CNTs\\} decreased the thermal conductivity and thermal diffusivity of the samples significantly.

Keerti Kappagantula; Michelle L. Pantoya

2012-01-01T23:59:59.000Z

407

Manufacture of a carbon-fabric-reinforced polyetherimide (CF/PEI) composite material  

Science Journals Connector (OSTI)

Relationships between impregnation mechanisms, consolidation quality and the resulting mechanical properties of carbon-fibre-fabric reinforced polyetherimide (CF/ PEI) thermoplastic composites have been investigated. A compression-moulding procedure was applied to simulate the effects of different processing conditions (i.e. pressure, holding time and processing temperature) on the quality of finished samples. Microscopic studies of cross-sections, density measurements and flexural mechanical properties were used to examine the quality of impregnation and consolidation. A qualitative model to describe the impregnation and consolidation processes of this material was developed. It predicts the variations of void content during consolidation, as well as the holding time, moulding temperature and pressure required to reach full consolidation. Good agreement between theoretical predictions and experimental data indicates the success of the approach. Finally, aileron ribs for a civil aircraft were successfully manufactured from the CF/PEI material according to the suggested optimum processing conditions.

M. Hou; L. Ye; H.J. Lee; Y.W. Mai

1998-01-01T23:59:59.000Z

408

Comparison of gold- and graphene-based resonant nanostructures for terahertz metamaterials and an ultrathin graphene-based modulator  

SciTech Connect

Graphene exhibits unique material properties, and in electromagnetic wave technology it raises the prospect of devices miniaturized down to the atomic length scale. Here we study split-ring resonator metamaterials made from graphene and we compare them to gold-based metamaterials. We find that graphene's huge reactive response derived from its large kinetic inductance allows for deeply subwavelength resonances, although its resonance strength is reduced due to higher dissipative loss damping and smaller dipole coupling. Nevertheless, tightly stacked graphene rings may provide for negative permeability and the electric dipole resonance of graphene meta-atoms turns out to be surprisingly strong. Based on these findings, we present a terahertz modulator based on a metamaterial with a multilayer stack of alternating patterned graphene sheets separated by dielectric spacers. Neighboring graphene flakes are biased against each other, resulting in modulation depths of over 75% at a transmission level of around 90%.

Shen, Nian-Hai [Ames Laboratory; Tassin, Philippe [Ames Laboratory; Koschny, Thomas [Ames Laboratory; Soukoulis, Costas M [Ames Laboratory

2014-09-01T23:59:59.000Z

409

Charging Graphene for Energy Storage  

SciTech Connect

Since 2004, graphene, including single atomic layer graphite sheet, and chemically derived graphene sheets, has captured the imagination of researchers for energy storage because of the extremely high surface area (2630 m2/g) compared to traditional activated carbon (typically below 1500 m2/g), excellent electrical conductivity, high mechanical strength, and potential for low cost manufacturing. These properties are very desirable for achieving high activity, high capacity and energy density, and fast charge and discharge. Chemically derived graphene sheets are prepared by oxidation and reduction of graphite1 and are more suitable for energy storage because they can be made in large quantities. They still contain multiply stacked graphene sheets, structural defects such as vacancies, and oxygen containing functional groups. In the literature they are also called reduced graphene oxide, or functionalized graphene sheets, but in this article they are all referred to as graphene for easy of discussion. Two important applications, batteries and electrochemical capacitors, have been widely investigated. In a battery material, the redox reaction occurs at a constant potential (voltage) and the energy is stored in the bulk. Therefore, the energy density is high (more than 100 Wh/kg), but it is difficult to rapidly charge or discharge (low power, less than 1 kW/kg)2. In an electrochemical capacitor (also called supercapacitors or ultracapacitor in the literature), the energy is stored as absorbed ionic species at the interface between the high surface area carbon and the electrolyte, and the potential is a continuous function of the state-of-charge. The charge and discharge can happen rapidly (high power, up to 10 kW/kg) but the energy density is low, less than 10 Wh/kg2. A device that can have both high energy and high power would be ideal.

Liu, Jun

2014-10-06T23:59:59.000Z

410

Method and apparatus for producing composites of materials exhibiting thermoplastic properties  

DOE Patents (OSTI)

A mobile device for the complete consolidation of layers of material which exhibit thermoplastic properties for the formation of a composite of the layers upon a complex contoured substrate. The principal of the device is to provide heating into the molten temperature range of the thermoplastic material, applying sufficient pressure to the layers to cause flow of the plastic for a time sufficient to achieve full consolidation of the layers, and quickly cooling the structure to prevent delamination or other non-consolidation action. In the preferred form, there is an element to deposit a layer of the mateiral against another layer in close proximity. The two layers are pre-heated to near the melting temperature, and then further heated into the melting temperature range as they are brought into intimate contact with sufficient pressure to cause flow of the plastic for a time sufficient to achieve the full consolidation. The structure is then cooled. The mechanism for the application of pressure is selected such that the layers can be deformed to conform to a complex contour. In the preferred form, this pressurization is produced using a compliant hood that supplies both the pressure and at least a portion of the melting temperature, as well as the cooling. The apparatus, and method of operation, are described relative to the use of fiber-reinforced PEEK in the making of fully-consolidated composites. Other applications are discussed.

Garvey, Raymond E. (Knoxville, TN); Grostick, Edmund T. (Faragut, TN)

1992-01-01T23:59:59.000Z

411

Numerical investigation of graphene and graphene-polymer nanocomposites.  

E-Print Network (OSTI)

??This thesis is a comprehensive and deep investigation on graphene and graphene-polymer nanocomposites. It explores the strong structure-property relationships in both graphene and graphene-based polymeric… (more)

Wang, Mingchao

2014-01-01T23:59:59.000Z

412

Echoes of relativistic Landau levels in graphene and bilayer graphene  

Science Journals Connector (OSTI)

The problem of echo effects that can originate in graphene and bilayer graphene upon the generation of relativistic Landau levels in a quantizing magnetic field is considered. Graphene (bilayer graphene) is consi...

M. B. Belonenko; N. G. Lebedev; A. V. Zhukov

2012-03-01T23:59:59.000Z

413

Determining graphene adhesion via substrate-regulated morphology of graphene  

E-Print Network (OSTI)

Determining graphene adhesion via substrate-regulated morphology of graphene Zhao Zhang and Teng Li Institute of Physics. Related Articles Identification of graphene crystallographic orientation by atomic two-dimensional, epitaxially-grown, nanostructured graphene for study of single molecule

Li, Teng

414

Photochemical Chlorination of Graphene  

Science Journals Connector (OSTI)

Photochemical Chlorination of Graphene ... We report the covalent functionalization of graphene by photochemical chlorination. ... The gas-phase photochlorination of graphene, followed by the structural transformation of the C–C bonds from sp2 to sp3 configuration, could remove the conducting ?-bands and open up a band gap in graphene. ...

Bo Li; Lin Zhou; Di Wu; Hailin Peng; Kai Yan; Yu Zhou; Zhongfan Liu

2011-06-09T23:59:59.000Z

415

All-Graphene Photodetectors  

Science Journals Connector (OSTI)

All-Graphene Photodetectors ... Centre for Graphene Science, College of Engineering, Mathematics, and Physical Sciences, University of Exeter, Exeter EX4 4QL, United Kingdom ... We investigate the optoelectronic properties of novel graphene/FeCl3-intercalated few-layer graphene (FeCl3–FLG, dubbed graphexeter) heterostructures using photovoltage spectroscopy. ...

Freddie Withers; Thomas Hardisty Bointon; Monica Felicia Craciun; Saverio Russo

2013-04-09T23:59:59.000Z

416

Graphene Coating Coupled Emission  

E-Print Network (OSTI)

Graphene Coating Coupled Emission A COMSET, A single sheet of sp2-hybridized carbon atoms, called of graphene and its unique properties, I will present amplification of surface graphene-Ag hybrid films which when graphene is used as the spacer layer in a conventional Ag- harnessed the nonlinear properties

Shyamasundar, R.K.

417

Gelatin/graphene systems for low cost energy storage  

SciTech Connect

In this work, we introduce the possibility to use a low cost, biodegradable material for temporary energy storage devices. Here, we report the use of biologically derived organic electrodes composed of gelatin ad graphene. The graphene was obtained by mild sonication in a mixture of volatile solvents of natural graphite flakes and subsequent centrifugation. The presence of exfoliated graphene sheets was detected by atomic force microscopy (AFM) and Raman spectroscopy. The homogeneous dispersion in gelatin demonstrates a good compatibility between the gelatin molecules and the graphene particles. The electrical characterization of the resulting nanocomposites suggests the possible applications as materials for transient, low cost energy storage device.

Landi, Giovanni [Faculty of Mathematics and Computer Science, FernUniversität Hagen, 58084 Hagen (Germany); Fedi, Filippo; Sorrentino, Andrea; Iannace, Salvatore [Institute for Composite and Biomedical Materials (IMCB-CNR), Piazzale Enrico Fermi 1, 80055 Portici (Italy); Neitzert, Heinz C. [Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano (Italy)

2014-05-15T23:59:59.000Z

418

Effect of Composition and Heat Treatment on MnBi Magnetic Materials  

SciTech Connect

The metallic compound MnBi is a promising rare-earth-free permanent magnet material. Compare to other rare-earth-free candidates, MnBi stands out for its high intrinsic coercivity (Hci) and its large positive temperature coefficient. Several groups have demonstrated that the Hci of MnBi compound in thin film or in powder form can exceed 12 kOe and 26 kOe at 300 K and 523 K, respectively. Such steep increase in Hci with increasing temperature is unique to MnBi. Consequently, MnBi is a highly sought-after hard phase for exchange coupling nanocomposite magnets. The reaction between Mn and Bi is peritectic, so Mn tends to precipitate out of the MnBi liquid during the solidification process. As result, the composition of the Mn-Bi alloy with the largest amount of the desired LTP (low temperature phase) MnBi and highest saturation magnetization will be over-stoichiometric and rich in Mn. The amount of additional Mn required to compensate the Mn precipitation depends on solidification rate: the faster the quench speed, the less Mn precipitates. Here we report a systematic study of the effect of composition and heat treatments on the phase contents and magnetic properties of Mn-Bi alloys. In this study, Mn-Bi alloys with 14 compositions were prepared using conventional metallurgical methods such as arc melting and vacuum heat treatment, and the obtained alloys were analyzed for compositions, crystal structures, phase content, and magnetic properties. The results show that the composition with 55 at.% Mn exhibits the highest LTP MnBi content and the highest magnetization. The sample with this composition shows >90 wt.% LTP MnBi content. Its measured saturation magnetization is 68 emu/g with 2.3 T applied field at 300 K; its coercivity is 13 kOe and its energy product is 12 MGOe at 300 K. A bulk magnet fabricated using this powder exhibits an energy product of 8.2 MGOe.

Cui, Jun; Choi, Jung-Pyung; Polikarpov, Evgueni; Bowden, Mark E.; Xie, Wei; Li, Guosheng; Nie, Zimin; Zarkevich, Nikolai; Kramer, Matthew J.; Johnson, Duane D.

2014-08-17T23:59:59.000Z

419

Hierarchical interconnections in the nano-composite material Bone: Fibrillar Cross-Links resist fracture on several length scales  

E-Print Network (OSTI)

Hierarchical interconnections in the nano-composite material Bone: Fibrillar Cross-Links resist bone samples, possibly resisting the propagation of these cracks. Bone is one of the most important collagen and hydroxyapatite. Such materials are based on the crystal-polymer interactions on the molecular

Fygenson, Deborah Kuchnir

420

Magnetization dynamics of cobalt grown on graphene  

SciTech Connect

Ferromagnetic resonance (FMR) spin pumping is a rapidly growing field which has demonstrated promising results in a variety of material systems. This technique utilizes the resonant precession of magnetization in a ferromagnet to inject spin into an adjacent non-magnetic material. Spin pumping into graphene is attractive on account of its exceptional spin transport properties. This article reports on FMR characterization of cobalt grown on chemical vapor deposition graphene and examines the validity of linewidth broadening as an indicator of spin pumping. In comparison to cobalt samples without graphene, direct contact cobalt-on-graphene exhibits increased FMR linewidth—an often used signature of spin pumping. Similar results are obtained in Co/MgO/graphene structures, where a 1?nm MgO layer acts as a tunnel barrier. However, magnetometry, magnetic force microscopy, and Kerr microscopy measurements demonstrate increased magnetic disorder in cobalt grown on graphene, perhaps due to changes in the growth process and an increase in defects. This magnetic disorder may account for the observed linewidth enhancement due to effects such as two-magnon scattering or mosaicity. As such, it is not possible to conclude successful spin injection into graphene from FMR linewidth measurements alone.

Berger, A. J.; White, S. P.; Adur, R.; Pu, Y.; Hammel, P. C., E-mail: hammel@physics.osu.edu [Department of Physics, The Ohio State University, Columbus, Ohio 43210 (United States); Amamou, W. [Department of Physics and Astronomy, University of California, Riverside, California 92521 (United States); Kawakami, R. K. [Department of Physics, The Ohio State University, Columbus, Ohio 43210 (United States); Department of Physics and Astronomy, University of California, Riverside, California 92521 (United States)

2014-05-07T23:59:59.000Z

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Direct growth of graphene on Si(111)  

SciTech Connect

Due to the need of integrated circuit in the current silicon technology, the formation of graphene on Si wafer is highly desirable, but is still a challenge for the scientific community. In this context, we report the direct growth of graphene on Si(111) wafer under appropriate conditions using an electron beam evaporator. The structural quality of the material is investigated in detail by reflection high energy electron diffraction, Auger electron spectroscopy, X-ray photoemission spectroscopy, Raman spectroscopy, high resolution scanning electron microscopy, atomic force microscopy, and scanning tunneling microscopy. Our experimental results confirm that the quality of graphene is strongly dependent on the growth time during carbon atoms deposition.

Thanh Trung, Pham, E-mail: phamtha@fundp.ac.be; Joucken, Frédéric; Colomer, Jean-François; Robert, Sporken [Research Center in Physics of Matter and Radiation (PMR), University of Namur (FUNDP), 61 Rue de Bruxelles, 5000 Namur (Belgium); Campos-Delgado, Jessica; Raskin, Jean-Pierre [Electrical Engineering (ELEN), Institute of Information and Communication Technologies, Electronics and Applied Mathematics (ICTEAM), Université catholique de Louvain UCL, 3 place du Levant, Louvain-la-Neuve (Belgium); Hackens, Benoît; Santos, Cristiane N. [Nanoscopic physics (NAPS), Institute of Condensed Matter and Nanosciences (IMCN), Université catholique de Louvain UCL, 2 chemin du Cyclotron, Louvain-la-Neuve (Belgium)

2014-06-14T23:59:59.000Z

422

NEST Scientific Report 2007-2009 Graphene and artificial graphene  

E-Print Network (OSTI)

NEST Scientific Report 2007-2009 Graphene 43 Graphene and artificial graphene T his area-layer graphene behave like massless fermions. Graphene is a first remarkable and clean example of the impact of a potential with honeycomb structure on the electronic states and dynamics. In graphene the crystalline

Abbondandolo, Alberto

423

In situ growth of mesoporous NiO nanoplates on a graphene matrix as cathode catalysts for rechargeable lithium–air batteries  

Science Journals Connector (OSTI)

Abstract NiO/graphene nanocomposites are fabricated via a solvothermal method. Scanning and transmission electron microscopy results indicate that the NiO nanoplates (length, ~100 nm) were homogeneously distributed on the graphene sheets. The electrochemical properties of the samples as active cathode catalysts for rechargeable Li–air batteries are evaluated by constant current charge–discharge cycling. The composites exhibit a reversible capacity of 1160 mAh g?1 after 50 cycles at a discharge current density of 50 mA g?1; this reverse capacity is much higher than that of pure NiO nanoplates (30 mAh g?1). Using graphene as a conductive matrix, a homogeneous distribution of NiO nanoplates is accomplished and graphene serves as a framework for loading as produced Li2O2 during the discharge process, resulting in the excellent electrochemical performance of the composites. The mesoporous structure of the NiO nanoplates is suitable for the transfer of O2 and deposition of Li2O2 produced by the electrochemical reaction. NiO/graphene nanocomposites are a candidate material for high-capacity, low-cost, and nontoxic cathode catalysts in rechargeable Li–air batteries.

Danfeng Qiu; Gang Bu; Bin Zhao; Zixia Lin; Lin Pu; Lijia Pan; Yi Shi

2015-01-01T23:59:59.000Z

424

Electronic and Spintronic Properties of Graphene  

E-Print Network (OSTI)

and Spintronic Properties of Graphene by Ke-yu Pi Doctor ofof transition metal doped graphene over the last six years.steps including our graphene exfoliation, graphene

Pi, Keyu

2010-01-01T23:59:59.000Z

425

Quantum Hall effect in graphene decorated with disordered multilayer patches  

SciTech Connect

Quantum Hall effect (QHE) is observed in graphene grown by chemical vapour deposition using platinum catalyst. The QHE is even seen in samples which are irregularly decorated with disordered multilayer graphene patches and have very low mobility (<500 cm{sup 2}V{sup ?1}s{sup ?1}). The effect does not seem to depend on electronic mobility and uniformity of the resulting material, which indicates the robustness of QHE in graphene.

Nam, Youngwoo, E-mail: youngwoo.nam@chalmers.se [Department of Physics and Astronomy, Seoul National University, Seoul 151-747 (Korea, Republic of) [Department of Physics and Astronomy, Seoul National University, Seoul 151-747 (Korea, Republic of); Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-412 96 Gothenburg (Sweden); Sun, Jie, E-mail: jie.sun@chalmers.se; Lindvall, Niclas; Kireev, Dmitry; Yurgens, August [Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-412 96 Gothenburg (Sweden)] [Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-412 96 Gothenburg (Sweden); Jae Yang, Seung; Rae Park, Chong [Department of Materials Science and Engineering, Seoul National University, Seoul 151-747 (Korea, Republic of)] [Department of Materials Science and Engineering, Seoul National University, Seoul 151-747 (Korea, Republic of); Woo Park, Yung [Department of Physics and Astronomy, Seoul National University, Seoul 151-747 (Korea, Republic of)] [Department of Physics and Astronomy, Seoul National University, Seoul 151-747 (Korea, Republic of)

2013-12-02T23:59:59.000Z

426

Anomalous friction in suspended graphene  

Science Journals Connector (OSTI)

Since the discovery of the Amonton's law and with support of modern tribological models, friction between surfaces of three-dimensional materials is known to generally increase when the surfaces are in closer contact. Here, using molecular dynamics simulations of friction force microscopy on suspended graphene, we demonstrate an increase of? friction when the scanning tip is retracted away from the sample. We explain the observed behavior and address why this phenomenon has not been observed for isotropic 3D materials.

A. Smolyanitsky and J. P. Killgore

2012-09-20T23:59:59.000Z

427

Sandwich-Type Functionalized Graphene Sheet-Sulfur Nanocomposite for Rechargeable Lithium Batteries  

SciTech Connect

A sandwich structured graphene sheet-sulfur (GSS) nanocomposite was synthesized as the cathode material for lithium-sulfur batteries. The structure has a layer of graphene stacks and a layer of sulfur nanoparticles integrated into a three-dimensional architecture. This GSS nanoscale layered composite, making use of the efficient physical and electrical contact between sulfur and the large surface area, highly conductive graphene, provides a high loading of active materials of ~70 wt%, a high tape density of ~0.92 g?cm-3, and a high power with a reversible capacity of ~505 mAh?g-1 (~464 mAh?cm-3) at a current density of 1,680 mA?g-1 (1C). When coated with a thin layer of cation exchange Nafion film, the migration of dissolved polysulfide anions from the GSS nanocomposite was effectively alleviated, leading to a good cycling stability of 75% capacity retention over 100 cycles. This sandwich-structured composite conceptually provides a new strategy for designing electrodes in energy storage applications.

Cao, Yuliang; Li, Xiaolin; Aksay, Ilhan A.; Lemmon, John P.; Nie, Zimin; Yang, Zhenguo; Liu, Jun

2011-03-30T23:59:59.000Z

428

Self-assembly of photo-reduced graphene-titania films.  

SciTech Connect

In an aim to develop photo-responsive composites, the UV photo-reduction of aqueous titanium oxide nanoparticle-graphene oxide (TiO{sub 2}-GO) dispersions (Lambert et al. J Phys. Chem. 2010 113 (46), 19812-19823) was undertaken. Photo-reduction led to the formation of a black precipitate as well as a soluble portion, comprised of titanium oxide nanoparticle-reduced graphene oxide (TiO{sub 2}-RGO). When allowed to slowly evaporate, self assembled titanium oxide nanoparticle-graphene oxide (SA-TiO{sub 2}-RGO) films formed at the air-liquid interface of the solution. The thickness of SARGO-TiO{sub 2} films range from {approx}30-100 nm when deposited on substrates, and appear to be comprised of a mosaic assembly of graphene nanosheets and TiO{sub 2}, as observed by scanning electron microscopy. Raman spectroscopy and X-ray photoelectron spectroscopy indicate that the graphene oxide is only partially reduced in the SA-TiO{sub 2}-RGO material. These films were also deposited onto inter-digitated electrodes and their photo-responsive behavior was examined. UV-exposure lead to a {approx} 200 kOhm decrease in resistance across the device, resulting in a cathodically biased film. The cathodic bias of the films was utilized for the subsequent reduction of Ag(NO{sub 3}) into silver (Ag) nanoparticles, forming a ternary Ag-(SA-RGO-TiO{sub 2}) composite. Various aspects of the self assembled films, their photoconductive properties as well as potential applications will be presented.

Lambert, Timothy N.; Chavez, Carlos A.; Bell, Nelson Simmons; Washburn, Cody M.; Brumbach, Michael Todd; Wheeler, David Roger; McKenzie, Bonnie Beth

2010-07-01T23:59:59.000Z

429

Electronic transport in atomically thin layered materials  

E-Print Network (OSTI)

Electronic transport in atomically thin layered materials has been a burgeoning field of study since the discovery of isolated single layer graphene in 2004. Graphene, a semi-metal, has a unique gapless Dirac-like band ...

Baugher, Britton William Herbert

2014-01-01T23:59:59.000Z

430

Composite materials with metal oxide attached to lead chalcogenide nanocrystal quantum dots with linkers  

DOE Patents (OSTI)

Composite materials useful for devices such as photoelectrochemical solar cells include a substrate, a metal oxide film on the substrate, nanocrystalline quantum dots (NQDs) of lead sulfide, lead selenide, and lead telluride, and linkers that attach the NQDs to the metal oxide film. Suitable linkers preserve the 1s absorption peak of the NQDs. A suitable linker has a general structure A-B-C where A is a chemical group adapted for binding to a MO.sub.x and C is a chemical group adapted for binding to a NQD and B is a divalent, rigid, or semi-rigid organic spacer moiety. Other linkers that preserve the 1s absorption peak may also be used.

Fuke, Nobuhiro; Koposov, Alexey Y; Sykora, Milan; Hoch, Laura

2014-12-16T23:59:59.000Z

431

Strong enhancement of light absorption and highly directive thermal emission in graphene  

E-Print Network (OSTI)

Strong enhancement of light absorption and highly directive thermal emission in graphene Mingbo Pu: Graphene is a two-dimensional material with exotic electronic, optical and thermal properties. The optical absorption in monolayer graphene is limited by the fine structure constant . Here we demonstrated the strong

Chen, Po

432

Ballistic Graphene Nanoribbon MOSFETs: a full quantum real-space simualtion study  

E-Print Network (OSTI)

Ballistic Graphene Nanoribbon MOSFETs: a full quantum real-space simualtion study Gengchiau Liang performance of CNR MOSFETs is also studied. We found that 2D semi-infinite graphene contacts provide metal. INTRODUCTION Graphite-related materials such as fullerenes, graphene, and carbon nanotubes have generated

433

Modified Schrdinger Equation for Quantum Dynamics of Radicals. Study of Graphene Nanoflakes  

E-Print Network (OSTI)

and as electrode active materials in secondary batteries [8]. Graphene nanoflakes (GNFs), also known as nanoislands1 Modified Schrödinger Equation for Quantum Dynamics of Radicals. Study of Graphene Nanoflakes motion in edge-passivated (with hydrogen) graphene nanoflakes (GNFs) depending on their shapes

Benzi, Michele

434

A Novel Graphene-Based Inkjet-Printed WISP-Enabled Wireless Gas Sensor  

E-Print Network (OSTI)

A Novel Graphene-Based Inkjet-Printed WISP- Enabled Wireless Gas Sensor Taoran Le, Vasileios thin films produced from environmentally friendly, water-based, inkjet printed graphene oxide (GO) ink is achieved using the graphene thin films, with over 30% of material recovery observed within 5 minutes

Tentzeris, Manos

435

NEST Scientific Report 2007-200947 Electronic states and quantum transport in graphene ribbons  

E-Print Network (OSTI)

NEST Scientific Report 2007-200947 Electronic states and quantum transport in graphene ribbons G dimensional carbon sheets have been isolated, and the potential of graphene-based electronics on the micro- and nano-metric scale has further magnified the interest toward this material. Graphene ribbons

Abbondandolo, Alberto

436

Photothermal Response in Dual-Gated Bilayer Graphene M.-H. Kim,1  

E-Print Network (OSTI)

Photothermal Response in Dual-Gated Bilayer Graphene M.-H. Kim,1 J. Yan,1,2 R. J. Suess,3 T. E photoresponse in gapped bilayer graphene was investigated by optical and transport measurements. A pulse There is growing recognition that graphene has excep- tional potential as a new optoelectronic material, which has

Murphy, Thomas E.

437

Composition-tailored synthesis of gradient transition metal precursor particles for lithium-ion battery cathode materials.  

SciTech Connect

We report the tailored synthesis of particles with internal gradients in transition metal composition aided by the use of a general process model. Tailored synthesis of transition metal particles was achieved using a coprecipitation reaction with tunable control over the process conditions. Gradients in the internal composition of the particles was monitored and confirmed experimentally by analysis of particles collected during regularly timed intervals. Particles collected from the reactor at the end of the process were used as the precursor material for the solid-state synthesis of Li{sub 1.2}(Mn{sub 0.62}Ni{sub 0.38}){sub 0.8}O{sub 2}, which was electrochemically evaluated as the active cathode material in a lithium battery. The Li{sub 1.2}(Mn{sub 0.62}Ni{sub 0.38}){sub 0.8}O{sub 2} material was the first example of a structurally integrated multiphase material with a tailored internal gradient in relative transition metal composition as the active cathode material in a lithium-ion battery. We believe our general synthesis strategy may be applied to produce a variety of new cathode materials with tunable interior, surface, and overall relative transition metal compositions.

Koenig, G. M.; Belharouak, I.; Deng, H.; Amine, K.; Sun, Y. K. (Chemical Sciences and Engineering Division)

2011-04-12T23:59:59.000Z

438

The Electronic Structure of Single-Layer Graphene  

E-Print Network (OSTI)

2.11 Graphene Characterization Withof Bilayer Graphene . . . . . . . . . . . . . . . . . .in Monolayer Graphene Matrix Element . . . . . . . . . . .

Siegel, David Alan

2012-01-01T23:59:59.000Z

439

Mechanical and electrochemical performance of composite cathode contact materials for solid oxide fuel cells  

SciTech Connect

The feasibility of adding glass or inorganic binder to conventional SOFC cathode contact materials (CCM) in order to improve bonding to adjacent materials in the cell stack is assessed. Two glasses (SEM-COM SCZ-8 and Schott GM31107) and one inorganic binder (Aremco 644A) are mixed with LSM particles to produce composite CCM pastes. These are used to bond Mn1.5Co1.5O4-coated stainless steel mesh current collectors to anode-supported button cells. The cells are operated at 800 C for about 1000 h. The cell with SCZ-8 addition to the CCM displays quite stable operation (3.9%/1000 h degradation), whereas the other additives lead to somewhat higher degradation rate. Bonding of the CCM to coated stainless steel coupons is also assessed. Interfacial fracture toughness is determined using a four-point bend test. The fracture toughness for LSM Schott glass (12.3 N mm 1), LSM SCZ-8 glass (6.8 N mm 1) and LSM 644A binder (5.4 N mm 1) are significantly improved relative to pure LSM (1.7 N mm 1). Indeed, addition of binder or glass is found to improve bonding of the CCM layer without sacrificing cell performance.

Tucker, Michael C. [Lawrence Berkeley National Laboratory (LBNL); Dejonghe, Lutgard C. [Lawrence Berkeley National Laboratory (LBNL); Garcia-Negron, Valerie [Material Science and Technology Division, Oak Ridge National Laboratory; Trejo, Rosa M [ORNL; Lara-Curzio, Edgar [ORNL

2013-01-01T23:59:59.000Z

440

Graphene nanoribbon based spaser  

Science Journals Connector (OSTI)

A novel type of spaser with the net amplification of surface plasmons (SPs) in a doped graphene nanoribbon is proposed. The plasmons in the THz region can be generated in a doped graphene nanoribbon due to nonradiative excitation by emitters like two level quantum dots located along a graphene nanoribbon. The minimal population inversion per unit area, needed for the net amplification of SPs in a doped graphene nanoribbon, is obtained. The dependence of the minimal population inversion on the surface plasmon wave vector, graphene nanoribbon width, doping, and damping parameters necessary for the amplification of surface plasmons in the armchair graphene nanoribbon is studied.

Oleg L. Berman; Roman Ya. Kezerashvili; Yurii E. Lozovik

2013-12-19T23:59:59.000Z

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Abnormal Cyclibility in Ni@Graphene Core–Shell and Yolk–Shell Nanostructures for Lithium Ion Battery Anodes  

Science Journals Connector (OSTI)

Abnormal Cyclibility in Ni@Graphene Core–Shell and Yolk–Shell Nanostructures for Lithium Ion Battery Anodes ... A new graphene-based hybrid nanostructure is designed for anode materials in lithium-ion batteries. ...

Huawei Song; Hao Cui; Chengxin Wang

2014-07-08T23:59:59.000Z

442

Degradation of Adhesive Joints for Joining Composite Material with Aluminum under Immersion in Water and Motor Oil  

Science Journals Connector (OSTI)

Abstract Structural adhesive joints are adequate for joining aluminum with composite material (automotive, aeronautic, etc.). However, in many occasions, these adhesive joints are subjected to very adverse service conditions. This way, depending where they are, they must resist great humidity, oil projections, high temperatures, etc. For this cause, an appropriate operation of these adhesive joints requires know its behavior under these conditions. In line with this objective, present work analyzes the degradation that adhesive joints of composite material and aluminum experiences when they are immersed in water or motor oil. Also, the loss of mechanical properties originated by this degradation has been evaluated quantitatively by flexion tests.

J.M. Arenas; C. Alía; R. Ocaña; J.J. Narbón

2013-01-01T23:59:59.000Z

443

Phosphorescent compositions, methods of making the compositions, and methods of using the compositions  

SciTech Connect

Compositions, methods of making compositions, materials including compositions, crayons including compositions, paint including compositions, ink including compositions, waxes including compositions, polymers including compositions, vesicles including the compositions, methods of making each, and the like are disclosed.

Jia, Weiyi; Wang, Xiaojun; Jia, George D.; Lewis, Linda; Yen, Laurel C.

2014-06-24T23:59:59.000Z

444

On the hyperelastic softening and elastic instabilities in graphene  

Science Journals Connector (OSTI)

...Elastic material instabilities are precursors to failure in defect-free graphene single...instability is identified which occurs prior to the configuration of maximum true stress...submicrometre region of the graphene sheet is probed to the largest deformation levels, and this...

2015-01-01T23:59:59.000Z

445

Engineering Enhanced Thermoelectric Properties in Zigzag Graphene Nanoribbons  

E-Print Network (OSTI)

- ties [7]. Graphene, however, is not a useful thermoelectric material. Although its electricalEngineering Enhanced Thermoelectric Properties in Zigzag Graphene Nanoribbons Hossein Karamitaheri1@iue.tuwien.ac.at (Dated: March 7, 2012) Abstract We theoretically investigate the thermoelectric properties of zigzag

446

Regenerative oscillation and four-wave mixing in graphene optoelectronics  

E-Print Network (OSTI)

Regenerative oscillation and four-wave mixing in graphene optoelectronics T. Gu1 *, N. Petrone2 , J consecutive first observations in graphene­ silicon hybrid optoelectronic devices--ultralow-power resonant optoelectronics and all-optical signal processing. S ubwavelength nanostructures in monolithic material platforms

Hone, James

447

Preparation and characterization of graphene oxide Dmitriy A. Dikin1  

E-Print Network (OSTI)

LETTERS Preparation and characterization of graphene oxide paper Dmitriy A. Dikin1 , Sasha batteries or supercapa- citors, adhesive layers, electronic or optoelectronic components, and molecular and characterization of graphene oxide paper, a free-standing carbon- based membrane material made by flow

448

Full-field characterization of thermal diffusivity in continuous- fiber ceramic composite materials and components  

SciTech Connect

Continuous-fiber ceramic matrix composites (CFCCs) are currently being developed for various high-temperature applications, including use in advanced heat engines. Among the material classes of interest for such applications are silicon carbide (SiC)-fiber-reinforced SiC (SiC{sub (f)}/SiC), SiC-fiber-reinforced silicon nitride (SiC {sub (f)}/Si{sub 3}N{sub 4}), aluminum oxide (Al{sub 2}O{sub 3})-fiber-reinforced Al{sub 2}O{sub 3} (Al{sub 2}O{sub 3}{sub (f)}/Al{sub 2}O{sub 3}), and others. In such composites, the condition of the interfaces (between the fibers and matrix) are critical to the mechanical and thermal behavior of the component (as are conventional mechanical defects such as cracks, porosity, etc.). For example, oxidation of this interface (especially on carbon coated fibers) can seriously degrade both mechanical and thermal properties. Furthermore, thermal shock damage can degrade the matrix through extensive crack generation. A nondestructive evaluation method that could be used to assess interface condition, thermal shock damage, and to detect other ``defects`` would thus be very beneficial, especially if applicable to full-scale components. One method under development uses infrared thermal imaging to provide ``single-shot`` full-field assessment of the distribution of thermal properties in large components by measuring thermal diffusivity. By applying digital image filtering, interpolation, and least-squares-estimation techniques for noise reduction, we can achieve acquisition and analysis times of minutes or less with submillimeter spatial resolution. The system developed at Argonne has been used to examine the effects of thermal shock, oxidation treatment, density variations, and variations in oxidation resistant coatings in a full array of test specimens. Subscale CFCC components with nonplanar geometries have also been studied for manufacturing-induced variations in thermal properties.

Steckenrider, J.S.; Ellingson, W.A. [Argonne National Lab., IL (United States); Rothermel, S.A. [South Dakota State Univ., Brookings, SD (United States)

1995-05-01T23:59:59.000Z

449

Anomalous behaviour of magnetic coercivity in graphene oxide and reduced graphene oxide  

SciTech Connect

In this report, we present the temperature dependence of the magnetic coercivity of graphene oxide (GO) and reduced graphene oxide (RGO). We observe an anomalous decrease in coercivity of GO and RGO with decreasing temperature. The observation could be understood by invoking the inherent presence of wrinkles on graphene oxide due to presence of oxygen containing groups. Scanning electron microscopic image reveals high wrinkles in GO than RGO. We observe higher coercivity in RGO than in GO. At room temperature, we observe antiferromagnetic and ferromagnetic behaviours in GO and RGO, respectively. Whereas, at low temperatures (below T?=?60–70?K), both materials show paramagnetic behaviour.

Bagani, K.; Bhattacharya, A.; Kaur, J.; Rai Chowdhury, A.; Ghosh, B.; Banerjee, S., E-mail: sangam.banerjee@saha.ac.in [Saha Institute of Nuclear Physics, Surface Physics Division, 1/AF Bidhannagar, Kolkata 700064 (India); Sardar, M. [Material Science Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102 (India)

2014-01-14T23:59:59.000Z

450

14 - Graphene nanoelectromechanics (NEMS)  

Science Journals Connector (OSTI)

Abstract: The use of graphene in the development of nanoscale mechanical structures is reviewed. The recent development of graphene resonators and techniques used to fabricate and characterise them is described. Some applications in sensor technology are highlighted.

Z. Moktadir

2014-01-01T23:59:59.000Z

451

Highly Deformable Graphene Kirigami  

E-Print Network (OSTI)

Graphene's exceptional mechanical properties, including its highest-known stiffness (1 TPa) and strength (100 GPa) have been exploited for various structural applications. However, graphene is also known to be quite brittle, with experimentally-measured tensile fracture strains that do not exceed a few percent. In this work, we introduce the notion of graphene kirigami, where concepts that have been used almost exclusively for macroscale structures are applied to dramatically enhance the stretchability of both zigzag and armchair graphene. Specifically, we show using classical molecular dynamics simulations that the yield and fracture strains of graphene can be enhanced by about a factor of three using kirigami as compared to standard monolayer graphene. This enhanced ductility in graphene should open up interesting opportunities not only mechanically, but also in coupling to graphene's electronic behavior.

Qi, Zenan; Campbell, David K

2014-01-01T23:59:59.000Z

452

Raman Nanometrology of Graphene.  

E-Print Network (OSTI)

??Graphene is a two-dimensional honey-comb lattice of carbon atoms with very unusual electron energy dispersion. Since its recent micromechanical isolation and measurements, graphene attracted tremendous… (more)

Calizo, Irene Gonzales

2009-01-01T23:59:59.000Z

453

Graphene Frequency Multipliers  

E-Print Network (OSTI)

In this letter, the ambipolar transport properties of graphene flakes have been used to fabricate full-wave signal rectifiers and frequency-doubling devices. By correctly biasing an ambipolar graphene field-effect transistor ...

Wang, Han

454

Functionalization of buckled graphene.  

E-Print Network (OSTI)

??Buckled graphene produced by the halogen based etching of 6H-SiC provides a new route for the functionalization of the graphene surface. This surface provides an… (more)

Nelson, Timothy C. (Timothy Chadwick)

2011-01-01T23:59:59.000Z

455

Electronic properties of epitaxial graphene  

Science Journals Connector (OSTI)

It has been known for almost 25 years that high temperature treatment of polar faces of SiC crystals lead to the graphitisation of the surface as a consequence of Si preferential sublimation. The group of Walt de Heer in Atlanta has proposed to use this procedure to obtain macroscopic multilayer graphene samples. This has lead to a renewal of interest for the study of the graphitic layers grown on the SiC surfaces. Due to the polar nature of the material, the 6H(4H)-SiC substrate present two non-equivalent surfaces: the (0001) is known as the Si face, and the (000-1) one is the C face. It turns out that the structure and the properties of the multilayer graphene samples obtained on those two surfaces are rather different. In particular the multilayer graphene samples grown on the C-terminated face presents electronic properties that are rather similar to those of monolayer graphene with very high mobility. This is shown by transport and optical experiments under high magnetic field. This surprising result is explained by the rotational stacking sequence, observed experimentally, which leads to an electronic decoupling as demonstrated by ab initio band structure calculations.

Claire Berger; Jean-Yves Veuillen; Laurence Magaud; Pierre Mallet; Valerio Olevano; M. Orlita; P. Plochocka; C. Faugeras; G. Martinez; Marek Potemski; Cecile Naud; Laurent P. Levy; Didier Mayou

2010-01-01T23:59:59.000Z

456

Progress In Electromagnetics Research B, Vol. 15, 197215, 2009 MODELING OF SHIELDING COMPOSITE MATERIALS  

E-Print Network (OSTI)

Progress In Electromagnetics Research B, Vol. 15, 197­215, 2009 MODELING OF SHIELDING COMPOSITE B. Archambeault IBM Co. Research Triangle Park, NC, USA Abstract--Composites containing conducting structures are studied, with both absorbing and reflecting composite layers. In this paper, fiber

Koledintseva, Marina Y.

457

Ripping Graphene: Preferred Directions  

Science Journals Connector (OSTI)

Ripping Graphene: Preferred Directions ... Here we present experimental and theoretical studies on cracks or tears in suspended monolayer graphene membranes. ... Edges from mechanically induced ripping exhibit straight lines and are predominantly aligned in the armchair or zigzag directions of the graphene lattice. ...

Kwanpyo Kim; Vasilii I. Artyukhov; William Regan; Yuanyue Liu; M. F. Crommie; Boris I. Yakobson; A. Zettl

2011-12-12T23:59:59.000Z

458

GRAPHENE: ELECTRON PROPERTIES AND  

E-Print Network (OSTI)

GRAPHENE: ELECTRON PROPERTIES AND TRANSPORT PHENOMENA Leonid Levitov MIT Lecture notes and HW and magnetoresistance Quantum Hall effect reminder The half-integer QHE in graphene Energy gaps and splitting of Landau levels QHE in p-n and p-n-p junctions Spin transport at graphene edge Fine structure constant

Gabrieli, John

459

Final Scientific Report, New Proton Conductive Composite Materials for PEM Fuel Cells  

SciTech Connect

This project covered one of the main challenges in present-day PEM fuel cell technology: to design a membrane capable of maintaining high conductivity and mechanical integrity when temperature is elevated and water vapor pressure is severely reduced. The DOE conductivity milestone of 0.1 S cm-1 at 120 degrees C and 50 % relative humidity (RH) for designed membranes addressed the target for the project. Our approach presumed to develop a composite membrane with hydrophilic proton-conductive inorganic material and the proton conductive polymeric matrix that is able to “bridge” the conduction paths in the membrane. The unique aspect of our approach was the use of highly functionalized inorganic additives to benefit from their water retention properties and high conductivity as well. A promising result turns out that highly hydrophilic phosphorsilicate gels added in Nafion matrix improved PEM fuel cell performance by over 50% compared with bare Nafion membrane at 120 degrees C and 50 % RH. This achievement realizes that the fuel cell operating pressure can be kept low, which would make the PEM fuel cell much more cost efficient and adaptable to practical operating conditions and facilitate its faster commercialization particularly in automotive and stationary applications.

Lvov, Serguei

2010-11-08T23:59:59.000Z

460

Effect of in situ material properties on fatigue damage modes in titanium matrix composites  

SciTech Connect

Titanium matrix composites (TMC) and their behavior under mechanical fatigue loads was the subject of this research. The primary objective was to explain fatigue damage modes in center-notched TMC specimens. Two modes of damage have been observed in continuously reinforced, zero-degree unidirectional, SCS-6/Ti-15V-3Cr-3Al-3Sn (SCS-6/Ti-15-3) laminates. The fatigue specimens were destructively analyzed using optical microscopy to determine where cracks originated and how they grew throughout the specimen. A micromechanical model was developed to explain the fatigue crack patterns observed in the interface region surrounding the fibers of the woven and acrylic-binder TMC material systems. A two-dimensional (2-D) model of a longitudinal lamina with a center hole was used to obtain a set of displacement boundary conditions for an element near the notch, yet within the net section where the spiral crack patterns were observed. These boundary conditions were then used on a three-dimensional (3-D) unit cell model of the fiber, matrix, and interface.

Harmon, D. [Boeing Co., St. Louis, MO (United States); Jerina, K.L. [Washington Univ., St. Louis, MO (United States). Materials Science and Engineering Program

1999-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Graphene-based functional materials.  

E-Print Network (OSTI)

??Functionele materialen gebaseerd op grafeen hebben zich snel ontwikkeld in het afgelopen decennium. Het produceren van grafeen met een hoge kwaliteit en het afstemmen van… (more)

Zhang, Xiaoyan

2013-01-01T23:59:59.000Z

462

Efficient Heat Storage Materials: Metallic Composites Phase-Change Materials for High-Temperature Thermal Energy Storage  

SciTech Connect

HEATS Project: MIT is developing efficient heat storage materials for use in solar and nuclear power plants. Heat storage materials are critical to the energy storage process. In solar thermal storage systems, heat can be stored in these materials during the day and released at night—when the sun’s not out—to drive a turbine and produce electricity. In nuclear storage systems, heat can be stored in these materials at night and released to produce electricity during daytime peak-demand hours. MIT is designing nanostructured heat storage materials that can store a large amount of heat per unit mass and volume. To do this, MIT is using phase change materials, which absorb a large amount of latent heat to melt from solid to liquid. MIT’s heat storage materials are designed to melt at high temperatures and conduct heat well—this makes them efficient at storing and releasing heat and enhances the overall efficiency of the thermal storage and energy-generation process. MIT’s low-cost heat storage materials also have a long life cycle, which further enhances their efficiency.

None

2011-11-21T23:59:59.000Z

463

Energy Waves and Plasmons in Graphene | MIT-Harvard Center for...  

NLE Websites -- All DOE Office Websites (Extended Search)

Waves and Plasmons in Graphene November 14, 2013 at 3pm6-233 Leonid Levitov Department of Physics, Massachusetts Institute of Technology levitovleonid Abstract: Materials in...

464

Hybrid Nano Carbon Fiber/Graphene Platelet-Based High-Capacity...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

anode materials- Si nano coatingparticles supported by a 3-D network (mat) of nano graphene platelets (NGP)carbon nano-fibers (CNF). Phase 2: Technology Development (This...

465

A rapid microwave heating route to synthesize graphene modified LiFePO4/C nanocomposite for rechargeable lithium-ion batteries  

Science Journals Connector (OSTI)

Abstract A simple and rapid method for synthesizing graphene modified LiFePO4/C nanocomposite has been developed for the first time by using a microwave heating. The obtained sample is characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectra, Fourier transform infrared spectroscopy (FTIR) and various electrochemical testing techniques. XRD results indicate that the nanosized olivine LiFePO4/(C+graphene) is successfully synthesized. The size of as-synthesized nanoparticles can be controlled below 200 nm with good reproducibility through this route. TEM image shows that the LiFePO4/C nanoparticles are embedded in graphene sheets. The electrochemical performance results reveal that the modification of LiFePO4/C with graphene could construct an effective conducting network, which significantly enhance the properties of LiFePO4/C based composite, including high discharge capacity, stable cycle performance, good rate capability and small charge-transfer resistance. The excellent performance shows that the graphene modified LiFePO4/C synthesized via microwave heating is a promising cathode material for rechargeable lithium-ion batteries.

Zhaozhi Wang; Haifu Guo; Peng Yan

2014-01-01T23:59:59.000Z

466

Three-Dimensional Flower-Shaped Activated Porous Carbon/Sulfur Composites as Cathode Materials for Lithium–Sulfur Batteries  

Science Journals Connector (OSTI)

After the active sulfur impregnation, both the FESEM images (Figure 1e,f) and TEM images (Figure 2c) of the FA-PC/S composite demonstrate a flower-shaped 3D superstructure similar to the original FA-PC material. ... Early on, carbonaceous materials dominated the anode and hence most of the possible improvements in the cell were anticipated at the cathode terminal; on the other hand, major developments in anode materials made in the last portion of the decade with the introduction of nanocomposite Sn/C/Co alloys and Si-C composites have demanded higher capacity cathodes to be developed. ... The photodecompn. of methyl orange indicates that such ZnO superstructures possess excellent photocatalytic activity. ...

Lan Zhou; Tao Huang; Aishui Yu

2014-09-19T23:59:59.000Z

467

Substrate-Induced Band-Gap Opening in Epitaxial Graphene  

NLE Websites -- All DOE Office Websites (Extended Search)

Substrate-Induced Band-Gap Opening in Epitaxial Graphene Print Substrate-Induced Band-Gap Opening in Epitaxial Graphene Print Prospective challengers to silicon, the long-reigning king of semiconductors for computer chips and other electronic devices, have to overcome silicon's superb collection of materials properties as well as sophisticated fabrication technologies refined by six decades of effort by materials scientists and engineers. Graphene, one of the latest contenders, has a rather impressive list of features of its own but has lacked a key characteristic of all semiconductors, an energy gap (band gap) in its electronic band structure. A multi-institutional collaboration under the leadership of researchers with Berkeley Lab and the University of California, Berkeley, have now demonstrated that growing an epitaxial film of graphene on a silicon carbide substrate results in a significant band gap, 0.26 electron volts (eV), an important step toward making graphene useful as a semiconductor.

468

Substrate-Induced Band-Gap Opening in Epitaxial Graphene  

NLE Websites -- All DOE Office Websites (Extended Search)

Substrate-Induced Band-Gap Opening in Epitaxial Graphene Print Substrate-Induced Band-Gap Opening in Epitaxial Graphene Print Prospective challengers to silicon, the long-reigning king of semiconductors for computer chips and other electronic devices, have to overcome silicon's superb collection of materials properties as well as sophisticated fabrication technologies refined by six decades of effort by materials scientists and engineers. Graphene, one of the latest contenders, has a rather impressive list of features of its own but has lacked a key characteristic of all semiconductors, an energy gap (band gap) in its electronic band structure. A multi-institutional collaboration under the leadership of researchers with Berkeley Lab and the University of California, Berkeley, have now demonstrated that growing an epitaxial film of graphene on a silicon carbide substrate results in a significant band gap, 0.26 electron volts (eV), an important step toward making graphene useful as a semiconductor.

469

Revisit Carbon/Sulfur Composite for Li-S Batteries  

SciTech Connect

To correlate the carbon properties e.g. surface area and porous structure, with the electrochemical behaviors of carbon/sulfur (C/S) composite cathodes for lithium-sulfur (Li-S) batteries, four different carbon frameworks including Ketjen Black (KB, high surface area and porous), Graphene (high surface area and nonporous), Acetylene Black (AB, low surface area and nonporous) and Hollow Carbon Nano Sphere (HCNS, low surface area and porous) are employed to immobilize sulfur (80 wt.%). It has been revealed that high surface area of carbon improves the utilization rate of active sulfur and decreases the real current density during the electrochemical reactions. Accordingly, increased reversible capacities and reduced polarization are observed for high surface area carbon hosts such as KB/S and graphene/S composites. The porous structure of KB or HCNS matrix promotes the long-term cycling stability of C/S composites but only at relatively low rate (0.2 C). Once the current density increases, the pore effect completely disappears and all Li-S batteries show similar trend of capacity degradation regardless of the different carbon hosts used in the cathodes. The reason has been assigned to the formation of reduced amount of irreversible Li2S on the cathode as well as shortened time for polysulfides to transport towards lithium anode at elevated current densities. This work provides valuable information for predictive selection on carbon materials to construct C/S composite for practical applications from the electrochemical point of view.

Zheng, Jianming; Gu, Meng; Wagner, Michael J.; Hays, Kevin; Li, Xiaohong S.; Zuo, Pengjian; Wang, Chong M.; Zhang, Jiguang; Liu, Jun; Xiao, Jie

2013-07-23T23:59:59.000Z

470

Thermopower of multilayer graphene  

Science Journals Connector (OSTI)

We systematically calculate thermopower of biased and unbiased multilayer graphene systems. The effect of screening to a bias field perpendicular to the graphene planes is taken into account self-consistently under the Hartree approximation. The model including nearest-neighbor hopping and the more general Slonczewski-Weiss-McClure model are both considered for a comparison. The effect of impurity scattering is studied for monolayer and unbiased bilayer graphene and is treated in terms of the self-consistent Born approximation. For a monolayer graphene, only when the effect of impurity scattering is taken into account, could all the qualitative aspects of the experimental results be correctly reproduced. Besides bilayer graphene, only trilayer graphene opens a small gap and shows a slight enhancement of thermopower under an external bias. The biased bilayer graphene shows the largest thermopower among all the systems studied.

Lei Hao and T. K. Lee

2010-12-10T23:59:59.000Z

471

Plasmonic graphene transparent conductors.  

SciTech Connect

Plasmonic graphene is fabricated using thermally assisted self-assembly of silver nanoparticles on graphene. The localized surface-plasmonic effect is demonstrated with the resonance frequency shifting from 446 to 495 nm when the lateral dimension of the Ag nanoparticles increases from about 50 to 150 nm. Finite-difference time-domain simulations are employed to confirm the experimentally observed light-scattering enhancement in the solar spectrum in plasmonic graphene and the decrease of both the plasmonic resonance frequency and amplitude with increasing graphene thickness. In addition, plasmonic graphene shows much-improved electrical conductance by a factor of 2-4 as compared to the original graphene, making the plasmonic graphene a promising advanced transparent conductor with enhanced light scattering for thin-film optoelectronic devices.

Xu, G.; Liu, J.; Wang, Q.; Hui, R.; Chen, Z.; Maroni, V. A.; Wu, J. (Materials Science Division); (Univ. Kansas)

2012-01-01T23:59:59.000Z

472

Negative permittivity and permeability spectra of Cu/yttrium iron garnet hybrid granular composite materials in the microwave frequency range  

SciTech Connect

The relative complex permittivity and permeability spectra of the coagulated copper and yttrium iron garnet (Cu/YIG) hybrid granular composite materials have been studied in the microwave range. The insulator to metal transition was observed at the percolation threshold of Cu particle content (?{sub Cu}?=?16.0 vol. %) in the electrical conductivity. In the percolation threshold, the low frequency plasmonic state caused by the metallic Cu particle networks was observed. The percolated Cu/YIG granular composites show simultaneous negative permittivity and permeability spectra under external magnetic fields.

Tsutaoka, Takanori, E-mail: tsutaok@hiroshima-u.ac.jp; Fukuyama, Koki; Kinoshita, Hideaki [Graduate School of Education, Hiroshima University, 1-1-1, Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8524 (Japan)] [Graduate School of Education, Hiroshima University, 1-1-1, Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8524 (Japan); Kasagi, Teruhiro [Tokuyama College of Technology, Gakuendai, Shunan, Yamaguchi 745-8585 (Japan)] [Tokuyama College of Technology, Gakuendai, Shunan, Yamaguchi 745-8585 (Japan); Yamamoto, Shinichiro; Hatakeyama, Kenichi [Graduate School of Engineering, University of Hyogo, Syosha, Himeji 671-2201 (Japan)] [Graduate School of Engineering, University of Hyogo, Syosha, Himeji 671-2201 (Japan)

2013-12-23T23:59:59.000Z

473

Comparison of gold- and graphene-based resonant nano-structures for terahertz metamaterials and an ultra-thin graphene-based modulator  

E-Print Network (OSTI)

Graphene exhibits unique material properties and in electromagnetic wave technology, it raises the prospect of devices miniaturized down to the atomic length scale. Here we study split-ring resonator metamaterials made from graphene and we compare them to gold-based metamaterials. We find that graphene's huge reactive response derived from its large kinetic inductance allows for deeply subwavelength resonances, although its resonance strength is reduced due to higher dissipative loss damping and smaller dipole coupling. Nevertheless, tightly stacked graphene rings may provide for negative permeability and the electric dipole resonance of graphene meta-atoms turns out to be surprisingly strong. Based on these findings, we present a terahertz modulator based on a metamaterial with a multi-layer stack of alternating patterned graphene sheets separated by dielectric spacers. Neighbouring graphene flakes are biased against each other, resulting in modulation depths of over 75% at a transmission level of around 90%...

Shen, Nian-Hai; Koschny, Thomas; Soukoulis, Costas M

2014-01-01T23:59:59.000Z

474

Polyethylene composites containing a phase change material having a C14 straight chain hydrocarbon  

DOE Patents (OSTI)

A composite useful in thermal energy storage, said composite being formed of a polyethylene matrix having a straight chain alkyl hydrocarbon incorporated therein, said polyethylene being crosslinked to such a degree that said polyethylene matrix is form stable and said polyethylene matrix is capable of absorbing at least 10% by weight of said straight chain alkyl hydrocarbon; the composite is useful in forming pellets or sheets having thermal energy storage characteristics.

Salyer, Ival O. (Dayton, OH)

1987-01-01T23:59:59.000Z

475

FY 2008 Progress Report for Lightweighting Materials- 8. Polymer Composites Research and Development  

Energy.gov (U.S. Department of Energy (DOE))

Lightweighting Materials focuses on the development and validation of advanced materials and manufacturing technologies to reduce automobile weight without compromising other attributes.

476

Evaluation of the Transient Thermal Performance of a Graphite Foam/Phase Change Material Composite.  

E-Print Network (OSTI)

?? The thermal transient response of graphite foam infiltrated with paraffin wax as a thermal protection composite was investigated. Graphite foam is a rigid open-celled… (more)

Trammell, Michael Paul

2013-01-01T23:59:59.000Z

477

Study on thermal performance of high power LED employing aluminum filled epoxy composite as thermal interface material  

Science Journals Connector (OSTI)

Abstract This paper elucidates the thermal behavior of an LED employing metal filled polymer matrix as thermal interface material (TIM) for an enhanced heat dissipation characteristic. Highly thermal conductive aluminum (Al) particles were incorporated in bisphenol A diglycidylether (DGEBA) epoxy matrix to study the effect of filler to polymer ratio on the thermal performance of high power LEDs. The curing behavior of DGEBA was studied by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The dispersion nature of the Al fillers in polymer matrix was verified with Field Emission Scanning Electron Microscope (FESEM). The thermal performance of synthesized Al filled polymer composite as TIM was tested with an LED employing thermal transient measurement technique. Comparing the filler to polymer ratio, the rise in junction temperature for 60 wt% Al filled composite was higher by 11.1 °C than 50 wt% Al filled composite at cured state. Observed also from the structure function analysis that the total thermal resistance was 10.96 K/W higher for 60 wt% Al filled composite compared to 50 wt% Al filled composite. On the other hand, a significant rise of 9.5 °C in the junction temperature between cured and uncured samples of 50 wt% Al filled polymer TIM was observed and hence the importance of curing process of metal filled polymer composite for effective heat dissipation is discussed extensively in this work.

P. Anithambigai; S. Shanmugan; D. Mutharasu; T. Zahner; D. Lacey

2014-01-01T23:59:59.000Z

478

Hot carrier diffusion in graphene  

E-Print Network (OSTI)

We report an optical study of charge transport in graphene. Diffusion of hot carriers in epitaxial graphene and reduced graphene oxide samples are studied using an ultrafast pump-probe technique with a high spatial resolution. Spatiotemporal...

Ruzicka, Brian Andrew; Wang, Shuai; Werake, Lalani Kumari; Weintrub, Ben; Loh, Kian Ping; Zhao, Hui

2010-11-01T23:59:59.000Z

479

Bilayer Graphene Gets a Bandgap  

NLE Websites -- All DOE Office Websites (Extended Search)

Bilayer Graphene Gets a Bandgap Bilayer Graphene Gets a Bandgap Print Wednesday, 26 August 2009 00:00 Graphene is the two-dimensional crystalline form of carbon whose extraordinary...

480

Renormalization group aspects of graphene  

Science Journals Connector (OSTI)

...Tsai Renormalization group aspects of graphene Maria A. H. Vozmediano * * vozmediano...Cantoblanco, , 28049 Madrid, Spain Graphene is a two-dimensional crystal of carbon...same lines. renormalization group|graphene|Coulomb interactions| 1. Introduction...

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "graphene composite material" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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481

Electronic Structure of Multilayer Graphene  

Science Journals Connector (OSTI)

......Articles Electronic Structure of Multilayer Graphene Hongki Min *) Allan H. MacDonald Department...the electronic structure of multilayer graphene using a pi-orbital continuum model...electronic structure of arbitrarily stacked graphene multilayers consists of chiral pseudospin......

Hongki Min; Allan H. MacDonald

2008-06-01T23:59:59.000Z

482

List of Journal Publications (updated April 2014) R. Justin, B. Chen*: Strong and conductive polymer-reduced graphene oxide  

E-Print Network (OSTI)

polymer-reduced graphene oxide nanocomposites for transdermal drug deliveyr. Journal of Materials*: Characterisation and drug release performance of biodegradable chitosan-graphene oxide nanocomposites. Carbohydrate Polymers. 2014, 103, 70-80. · R. Justin, B. Chen*: Body temperature reduction of graphene oxide through

Ojovan, Michael

483

An embryo of protocell membrane: The capsule of graphene oxide  

E-Print Network (OSTI)

Many signs indicate that the graphene could widely occur on the early Earth. Here, we report a new theory that graphene might be an embryo of protocell membrane, and found several evidences. Firstly, the graphene oxide and phospholipid-graphene oxide composite would curl into capsules in strongly acidic saturated solution of Pb(NO3)2 at low temperature, providing a protective space for biochemical reactions. Secondly, L-animi acids exhibit higher reactivity than D-animi acids for graphene oxides in favor of the formation of left-handed proteins. Thirdly, monolayer graphene with nanopores prepared by unfocused 84Kr25+ has high selectivity for permeation of the monovalent metal ions (Rb+ > K+ > Cs+ > Na+ > Li+), but does not allow Cl- through, which could be attributed to the ion exchange of oxygen-containing groups on the rim of nanopores. It is similar to K+ channels, which would cause efflux of some ions from capsule of graphene oxides with the decrease of pH in the primitive ocean, creating a suitable inner condition for the origin of life. Consequently, the strongly acidic, high salinity and strong radiation as well as temperature changes in the early Earth, regarded as negative factors, would be indispensable for the origin of protocell. In short, graphene bred life, but digested gradually by the evolution.

Zhan Li; Chunmei Wang; Longlong Tian; Jing Bai; Yang Zhao; Xin Zhang; Shiwei Cao; Wei Qi; Hongdeng Qiu; Suomin Wang; Keliang Shi; Youwen Xu; Zhang Mingliang; Bo Liu; Huijun Yao; Jie Liu; Wangsuo Wu; Xiaoli Wang

2014-11-07T23:59:59.000Z

484

Graphene as a manufactured product : a look forward  

E-Print Network (OSTI)

Graphene's unique electrical and mechanical properties have brought it into the spotlight in recent years. With the number of patents increasing rapidly every year, production of the material is becoming more and more ...

Frost, Stephen T

2013-01-01T23:59:59.000Z

485

Computational Study of the Development of Graphene Based Devices  

E-Print Network (OSTI)

Graphene is a promising material for many technological applications. To realize these applications, new fabrication techniques that allow precise control of the physical properties, as well as large scale integration between single devices...

Bellido Sosa, Edson

2012-02-14T23:59:59.000Z

486

An overview of the engineered graphene nanostructures and nanocomposites  

E-Print Network (OSTI)

. The current progress in supercapacitor energy storage density, solar cell power conversion efficiency metal adsorption capacity and efficiency, photocatalytic degradation rate of organic dye, flame, and high production cost. Therefore, graphene provides an alternative option to produce advanced materials

Guo, John Zhanhu

487

Tearing graphene sheets from adhesive substrates produces tapered nanoribbons  

E-Print Network (OSTI)

Graphene is a truly two-dimensional atomic crystal with exceptional electronic and mechanical properties. Whereas conventional bulk and thin-film materials have been studied extensively, the key mechanical properties of ...

Sen, Dipanjan

488

Functionalization of Graphene for Efficient Energy Conversion and Storage  

Science Journals Connector (OSTI)

Functionalization of Graphene for Efficient Energy Conversion and Storage ... Although the efficiency of energy conversion and storage devices depends on a variety of factors, their overall performance strongly relies on the structure and properties of the component materials. ...

Liming Dai

2012-10-03T23:59:59.000Z

489

Thin magnetic crystals are path to ferromagnetic graphene | ornl...  

NLE Websites -- All DOE Office Websites (Extended Search)

Functional Materials for Energy Thin magnetic crystals are path to ferromagnetic graphene January 23, 2015 The crystal structure of CrI3 includes hexagonal nets formed by Cr atoms...

490

Strain-induced band-gap engineering of graphene monoxide and its effect on graphene  

Science Journals Connector (OSTI)

Using first-principles calculations we demonstrate the feasibility of band-gap engineering in two-dimensional crystalline graphene monoxide (GMO), a recently reported graphene-based material with a 1:1 carbon/oxygen ratio. The band gap of GMO, which can be switched between direct and indirect, is tunable over a large range (0–1.35 eV) for accessible strains. Electron and hole transport occurs predominantly along the zigzag and armchair directions (armchair for both) when GMO is a direct- (indirect-) gap semiconductor. A band gap of ?0.5 eV is also induced in graphene at the K? points for GMO/graphene hybrid systems.

H. H. Pu; S. H. Rhim; C. J. Hirschmugl; M. Gajdardziska-Josifovska; M. Weinert; J. H. Chen

2013-02-13T23:59:59.000Z

491

Nanomaterials for Bioimaging and Drug Delivery Tang Z, S He, H Pei, D Du, C Fan, and Y Lin. 2013. "Graphene-Based Optical  

E-Print Network (OSTI)

. "Graphene-Based Optical Biosensors and Imaging." Chapter 5 in Biosensors Based on Nanomaterials. 2013. "Graphene based materials for biomedical applications." Materials Today 16 (10), 365-373 · Wang Y Nucleotides Exploiting DNA/RNA Aptamers and Graphene Oxide Nanosheets." Analytical Chemistry 85

Dutta, Indranath

492

Use of Composite Pipe Materials in the Transportation of Natural Gas (INEEL/EXT-02-00992)  

NLE Websites -- All DOE Office Websites (Extended Search)

992 992 Use of Composite Pipe Materials in the Transportation of Natural Gas Patrick Laney July 2002 Idaho National Engineering and Environmental Laboratory Bechtel BWXT Idaho, LLC INEEL/EXT-02-00992 Use of Composite Pipe Materials in the Transportation of Natural Gas Sponsored by Natural Gas Pipeline Infrastructure Reliability Program National Energy Technology Laboratory INEEL Field Work Proposal # 4340-70 Prepared by: Patrick Laney Idaho National Engineering and Environmental Laboratory Idaho Falls, Idaho With Contributions From: Ian Kopp Kenway Corporation Augusta, Maine July 2002 Idaho National Engineering and Environmental Laboratory Fossil Energy Technologies Department Idaho Falls, Idaho 83415 Prepared for the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy

493

Bilayer Graphene Gets a Bandgap  

NLE Websites -- All DOE Office Websites (Extended Search)

Bilayer Graphene Gets a Bandgap Print Graphene is the two-dimensional crystalline form of carbon whose extraordinary electron mobility and other unique features hold great promise...

494

Surprising Quasiparticle Interactions in Graphene  

NLE Websites -- All DOE Office Websites (Extended Search)

Surprising Quasiparticle Interactions in Graphene Surprising Quasiparticle Interactions in Graphene Print Wednesday, 31 October 2007 00:00 Until now, the world's electronics have...

495

Epitaxial Graphene - Energy Innovation Portal  

NLE Websites -- All DOE Office Websites (Extended Search)

Epitaxial Graphene Brookhaven National Laboratory Contact BNL About This Technology

Scanning electron micrographs of epitaxial graphene grown on ruthenium films atop patterned...

496

Search for: graphene | DOE PAGES  

Office of Scientific and Technical Information (OSTI)

graphene Find + Advanced Search Advanced Search All Fields: graphene Title: Full Text: Bibliographic Data: Creator Author: Name Name ORCID Search Authors Type: All Accepted...

497

Testing and Analysis of Low Cost Composite Materials Under Spectrum Loading and High Cycle Fatigue Conditions  

E-Print Network (OSTI)

architecture, environment, flaws, and manufacturing method. Second, for a single E-glass/polyester material blades [1]. As wind turbines expand in both size and importance, improvements in materials and lifetime

498

Wetting and energetics in nanoparticle etching of graphene  

E-Print Network (OSTI)

Molten metallic nanoparticles have recently been used to construct graphene nanostructures with crystallographic edges. The mechanism by which this happens, however, remains unclear. Here, we present a simple model that explains how a droplet can etch graphene. Two factors possibly contribute to this process: a difference between the equilibrium wettability of graphene and the substrate that supports it, or the large surface energy associated with the graphene edge. We calculate the etching velocities due to either of these factors and make testable predictions for evaluating the significance of each in graphene etching. This model is general and can be applied to other materials systems as well. As an example, we show how our model can be used to extend a current theory of droplet motion on binary semiconductor surfaces.

Sujit S. Datta

2010-08-12T23:59:59.000Z

499

Field emission properties of chemical vapor deposited individual graphene  

SciTech Connect

Here, we report field emission (FE) properties of a chemical vapor deposited individual graphene investigated by in-situ transmission electron microscopy. Free-standing bilayer graphene is mounted on a cathode microprobe and FE processes are investigated varying the vacuum gap of cathode and anode. The threshold field for 10?nA current were found to be 515, 610, and 870?V/?m for vacuum gap of 400, 300, and 200?nm, respectively. It is observed that the structural stability of a high quality bilayer graphene is considerably stable during emission process. By contacting the nanoprobe with graphene and applying a bias voltage, structural deformation and buckling are observed with significant rise in temperature owing to Joule heating effect. The finding can be significant for practical application of graphene related materials in emitter based devices as well as understanding the contact resistance influence and heating effect.

Zamri Yusop, Mohd [Department of Frontier Materials, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, 466-8555 Nagoya (Japan); Department of Materials, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor (Malaysia); Kalita, Golap, E-mail: kalita.golap@nitech.ac.jp [Department of Frontier Materials, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, 466-8555 Nagoya (Japan); Center for Fostering Young and Innovative Researchers, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, 466-8555 Nagoya (Japan); Yaakob, Yazid; Takahashi, Chisato; Tanemura, Masaki [Department of Frontier Materials, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, 466-8555 Nagoya (Japan)

2014-03-03T23:59:59.000Z

500

The effect of inhibitors on material and mechanical properties of oxidized carbon-carbon composites  

E-Print Network (OSTI)

oscillator techniques (PUCOT). An analytical diffusion model is developed to predict composite degradation for given exposure conditions, and these results are compared with the experimental data generated. Oxidation specimens are trimmed from a single C...

Elliott, Charles Howard

2012-06-07T23:59:59.000Z