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Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

Carbon nanotube-polymer composite actuators  

DOE Patents [OSTI]

The present invention discloses a carbon nanotube (SWNT)-polymer composite actuator and method to make such actuator. A series of uniform composites was prepared by dispersing purified single wall nanotubes with varying weight percents into a polymer matrix, followed by solution casting. The resulting nanotube-polymer composite was then successfully used to form a nanotube polymer actuator.

Gennett, Thomas (Denver, CO); Raffaelle, Ryne P. (Honeoye Falls, NY); Landi, Brian J. (Rochester, NY); Heben, Michael J. (Denver, CO)

2008-04-22T23:59:59.000Z

2

Carbon nanotube polymer composition and devices  

DOE Patents [OSTI]

A thin film device and compound having an anode, a cathode, and at least one light emitting layer between the anode and cathode, the at least one light emitting layer having at least one carbon nanotube and a conductive polymer.

Liu, Gao (Oakland, CA); Johnson, Stephen (Richmond, CA); Kerr, John B. (Oakland, CA); Minor, Andrew M. (El Cerrito, CA); Mao, Samuel S. (Castro Valley, CA)

2011-06-14T23:59:59.000Z

3

Finite Element Modelling and Molecular Dynamic Simulations of Carbon nanotubes/ Polymer Composites  

E-Print Network [OSTI]

Modeling of single-walled carbon nanotubes, multi-walled nanotubes and nanotube reinforced polymer composites using both the Finite Element method and the Molecular Dynamic simulation technique is presented. Nanotubes subjected to mechanical loading...

Gaddamanugu, Dhatri

2010-07-14T23:59:59.000Z

4

Computational Analysis of Carbon Nanotube Networks in Multifunctional Polymer Nanocomposites  

E-Print Network [OSTI]

Carbon nanotubes (CNTs) have attracted much attention as reinforcements in polymer composite materials because of their unique mechanical, electrical, and thermal properties. The high electrical conductivity of CNTs is especially promising for use...

Maxwell, Kevin S

2013-09-16T23:59:59.000Z

5

Stimuli-responsive polymer nanotube arrays  

E-Print Network [OSTI]

Nanotube arrays, composed of materials such as carbon, titania, and zinc oxide, have shown potential as conductors, energy conversion devices, actuators, and adhesives. Such nanoscale constructs are particularly novel for ...

Chia, Khek-Khiang

2011-01-01T23:59:59.000Z

6

Uniform Directional Alignment of Single-Walled Carbon Nanotubes in Viscous Polymer Flow  

Science Journals Connector (OSTI)

In this work, we probed the effects of shear flow on the alignment of dispersed single-walled carbon nanotubes in polymer solutions. Two different systems were compared:? Single-walled carbon nanotubes dispersed using an anionic surfactant and single-...

Erin Camponeschi; Bill Florkowski; Richard Vance; Glenn Garrett; Hamid Garmestani; Rina Tannenbaum

2006-01-14T23:59:59.000Z

7

Polymer-assisted deposition of films and preparation of carbon nanotube arrays using the films  

DOE Patents [OSTI]

Carbon nanotubes were prepared by coating a substrate with a coating solution including a suitable solvent, a soluble polymer, a metal precursor having a first metal selected from iron, nickel, cobalt, and molybdenum, and optionally a second metal selected from aluminum and magnesium, and also a binding agent that forms a complex with the first metal and a complex with the second metal. The coated substrate was exposed to a reducing atmosphere at elevated temperature, and then to a hydrocarbon in the reducing atmosphere. The result was decomposition of the polymer and formation of carbon nanotubes on the substrate. The carbon nanotubes were often in the form of an array on the substrate.

Luo, Hongmei; Li, Qingwen; Bauer, Eve; Burrell, Anthony Keiran; McCleskey, Thomas Mark; Jia, Quanxi

2013-07-16T23:59:59.000Z

8

Optically Functional Nanomaterials: Optothermally Responsive Composites and Carbon Nanotube Photovoltaics  

E-Print Network [OSTI]

and Carbon Nanotube Photovoltaics by David Christopher OkawaPart II: Carbon Nanotube Photovoltaics Chapter 6:Carbon NanotubePolymer Photovoltaics 6.1 Polymer-Nanotube

Okawa, David

2010-01-01T23:59:59.000Z

9

Multi-Walled Carbon Nanotubes-Modified Polymer Organic Photovoltaics.  

E-Print Network [OSTI]

??Since the carbon nanotubes were first discovered by Iijima in 1991, CNTs have been the focus of intense research by many groups. Nearly 7000 papers… (more)

Chen, Tzu-Fan

2009-01-01T23:59:59.000Z

10

Segregated Network Polymer-Carbon Nanotubes Composites For Thermoelectrics  

E-Print Network [OSTI]

nanocomposites were measured for carbon nanotubes and the thermoelectric figure of merit, ZT, was calculated at room temperature. The influence on thermoelectric properties from filler concentration, stabilizer materials and drying condition are also discussed....

Kim, Dasaroyong

2010-10-12T23:59:59.000Z

11

CARBON NANOTUBE POLYMER NANOCOMPOSITES FOR ELECTROMECHANICAL SYSTEM APPLICATIONS  

E-Print Network [OSTI]

-grained modeling and constitutive equations to develop structureproperty relationships for an amorphous aromatic piezoelectric polyimide substituted with nitrile dipole, carbon nanotubes and resulting nanocomposites. We have studied in detail structure...

Chakrabarty, Arnab

2010-10-12T23:59:59.000Z

12

Morphology effects on non-isotropic thermal conduction of aligned single- and multi-walled carbon nanotubes in polymer nanocomposites  

E-Print Network [OSTI]

Carbon nanotube (CNT)?CNT contact and CNT distribution effects on anisotropic thermal transport in aligned CNT?polymer nanocomposites (PNCs) are studied using an off-lattice Monte Carlo numerical simulation. Inter-CNT ...

Duong, Hai M.

13

Electrical, electromagnetic and structural characteristics of carbon nanotube-polymer nanocomposites  

E-Print Network [OSTI]

functionalized nanotubes and the RET is seen in the energyfunctionalized nanotubes and the RET is seen in the energythe nanotubes and the RET, and was evidenced by the energy

Park, Sung-Hoon

2009-01-01T23:59:59.000Z

14

Structure-Property Relationships in Carbon Nanotube-Polymer Systems: Influence of Noncovalent Stabilization Techniques  

E-Print Network [OSTI]

. Conversely, the mechanical properties are always better for epoxy composites containing covalently functionalized nanotubes. Clay particles were used as a rigid dispersing aid for nanotubes in aqueous suspensions and epoxy composites. When both nanotubes...

Liu, Lei

2010-01-20T23:59:59.000Z

15

Composites of Carbon Nanotubes.  

E-Print Network [OSTI]

??The purpose of this research was to study various methods of incorporation of single-walled carbon nanotubes (SWNT) with polymers for producing electrically conductive polystyrene composites.… (more)

Tchoul, Maxim N.

2008-01-01T23:59:59.000Z

16

Polymer and carbon nanotube materials for chemical sensors and organic electronics  

E-Print Network [OSTI]

This thesis details the development of new materials for high-performance chemical sensing as well as organic electronic applications. In Chapter 2, we develop a chemiresistive material based on single-walled carbon nanotubes ...

Wang, Fei, Ph. D. Massachusetts Institute of Technology

2010-01-01T23:59:59.000Z

17

Micromechanics modeling of the multifunctional nature of carbon nanotube-polymer nanocomposites  

E-Print Network [OSTI]

The present work provides a micromechanics approach based on the generalized self-consistent composite cylinders method as a non-Eshelby approach towards for assessing the impact of carbon nanotubes on the multi-functional nature of nanocom...

Seidel, Gary Don

2009-06-02T23:59:59.000Z

18

The effects of temperature and carbon nanotubes on conducting polymer actuator performance  

E-Print Network [OSTI]

Conducting polymers serve as electrically conductive actuators via ion diffusion in and out of the polymer when voltages are applied. Their actuation performance can be largely affected by deposition setup, post-deposition ...

Keng, Yenmei

2010-01-01T23:59:59.000Z

19

Oligomer functionalized nanotubes and composites formed therewith  

DOE Patents [OSTI]

Disclosed herein is a sequential functionalization methodology for the covalent modification of nanotubes with between one and four repeat units of a polymer. Covalent attachment of oligomer units to the surface of nanotubes results in oligomer units forming an organic sheath around the nanotubes, polymer-functionalized-nanotubes (P-NTs). P-NTs possess chemical functionality identical to that of the functionalizing polymer, and thus provide nanoscale scaffolds which may be readily dispersed within a monomer solution and participate in the polymerization reaction to form a polymer-nanotube/polymer composite. Formation of polymer in the presence of P-NTs leads to a uniform dispersion of nanotubes within the polymer matrix, in contrast to aggregated masses of nanotubes in the case of pristine-NTs. The covalent attachment of oligomeric units to the surface of nanotubes represents the formation of a functional nanoscale building block which can be readily dispersed and integrated within the polymer to form a novel composite material.

Zettl, Alexander K; Sainsbury, Toby; Frechet, Jean M.J.

2014-03-18T23:59:59.000Z

20

Ballistic conductance in quantum devices: from organic polymers to nanotubes q  

E-Print Network [OSTI]

, Young-Kyun Kwon, and Colin J. Lambert. * Permanent address: Department of Physics and Astronomy;atomic orbitals (LCAO) Hamiltonian with a scattering technique developed recently for magnetic multi-wall nanotube ropes [16,17] have shown that interwall coupling may induce pseudo-gaps near the Fermi level in

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

Stimuli-Tailored Dispersion State of Aqueous Carbon Nanotube Suspensions and Solid Polymer Nanocomposites  

E-Print Network [OSTI]

Nanoparticles (such as, carbon nanotubes, carbon black, clay etc.) have one or more dimensions of the order of 100 nm or less. Owing to very high van der Waals force of attraction, these nanoparticles exist in a highly aggregated state. It is often...

Etika, Krishna

2012-02-14T23:59:59.000Z

22

Synthesis of Thermal Interface Materials Made of Metal Decorated Carbon Nanotubes and Polymers  

E-Print Network [OSTI]

showed promise in their ability to have significant increase in thermal conduction while retaining the polymer’s mechanical properties. The highest k value that was obtained was 0.72 W/m-K for a well dispersed aligned 5 wt percent Ni@MWCNT sample. The Cu...

Okoth, Marion Odul

2011-10-21T23:59:59.000Z

23

Conductivity enhancement of carbon nanotube and nanofiber-based polymer nanocomposites by melt annealing  

E-Print Network [OSTI]

on a much larger scale using conventional polymer processing tech- niques such as single-screw or twin-screw to make polymer­MWCNT/CNF nanocomposites via twin-screw extrusion. To our surprise, the conductivities of extruded samples were disappointingly low. Indeed, an examina- tion of the literature on this topic shows

Raghavan, Srinivasa

24

N-Type Thermoelectric Performance of Functionalized Carbon Nanotube-Filled Polymer Composites  

E-Print Network [OSTI]

of the carbon honeycomb structure known as graphene, are semi-conductive depending on the lattice vector by which they are rolled. Intrinsically n-type, semiconducting nanotubes are highly susceptible to oxygen doping and become p-type in atmosphere.7... to the current research for a number of reasons. The first is that CNTs exhibit different electrical properties depending on their chirality, or the arrangement of the graphene hexagons relative to the tube axis. These electronic differences can make...

Freeman, Dallas

2012-07-16T23:59:59.000Z

25

High Electromechanical Response of Ionic Polymer Actuators with Controlled-Morphology Aligned Carbon Nanotube/Nafion Nanocomposite Electrodes  

E-Print Network [OSTI]

Recent advances in fabricating controlled-morphology vertically aligned carbon nanotubes (VA-CNTs) with ultrahigh volume fraction create unique opportunities for markedly improving the electromechanical performance of ionic ...

Liu, Sheng

26

Load Transfer Analysis in Short Carbon Fibers with Radially-Aligned Carbon Nanotubes Embedded in a Polymer Matrix  

E-Print Network [OSTI]

A novel shortfiber composite in which the microscopic advanced fiber reinforcements are coated with radially aligned carbon nanotubes (CNTs) is analyzed in this study. A shear-lag model is developed to analyze the load ...

Ray, M. C.

27

Double Walled Carbon Nanotube/Polymer Composites via in-situ Nitroxide Mediated Polymerisation of Amphiphilic Block Copolymers  

E-Print Network [OSTI]

been chosen, leading respectively to a hydrophilic first block (polyacrylic acid PAA) or a hydrophobic been extensively studied [2]. The key problem for CNT/polymer composite elaboration is the dispersion-treatment or functionalization. In addition, polymerisation of hydrophilic polymers, such as acrylic acid, is possible

Paris-Sud XI, Université de

28

Tensile stiffness analysis on ocean dynamic power umbilical  

Science Journals Connector (OSTI)

Tensile stiffness of ocean dynamic power umbilical is an important design parameter for ... for the estimation of tensile stiffness of the ocean dynamic power umbilical.

Ming-gang Tang ???; Jun Yan ? ?; Ye Wang ? ?; Qian-jin Yue ???

2014-04-01T23:59:59.000Z

29

Magnetic nanotubes  

DOE Patents [OSTI]

A magnetic nanotube includes bacterial magnetic nanocrystals contacted onto a nanotube which absorbs the nanocrystals. The nanocrystals are contacted on at least one surface of the nanotube. A method of fabricating a magnetic nanotube includes synthesizing the bacterial magnetic nanocrystals, which have an outer layer of proteins. A nanotube provided is capable of absorbing the nanocrystals and contacting the nanotube with the nanocrystals. The nanotube is preferably a peptide bolaamphiphile. A nanotube solution and a nanocrystal solution including a buffer and a concentration of nanocrystals are mixed. The concentration of nanocrystals is optimized, resulting in a nanocrystal to nanotube ratio for which bacterial magnetic nanocrystals are immobilized on at least one surface of the nanotubes. The ratio controls whether the nanocrystals bind only to the interior or to the exterior surfaces of the nanotubes. Uses include cell manipulation and separation, biological assay, enzyme recovery, and biosensors.

Matsui, Hiroshi (Glen Rock, NJ); Matsunaga, Tadashi (Tokyo, JP)

2010-11-16T23:59:59.000Z

30

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

31

Towards a carbon nanotube antibody sensor  

E-Print Network [OSTI]

This work investigated single-walled carbon nanotube (SWNT)/polymer-protein A complexes for optically reporting antibody concentration via a change in near infrared fluorescent emission after antibody binding. SWNT have ...

Bojö, Peter

2012-01-01T23:59:59.000Z

32

Polysiloxane Nanotubes  

Science Journals Connector (OSTI)

Figure 3. Polysiloxane nanotube formation in the liquid phase method: (A) SEM image of polysiloxane nanotubes after a reaction time of 5 h (upper left corner) and after a reaction time of 16 h. ... Black line: (A) EDX spectra of the bulk of a closed tapered polysiloxane nanotube; blue line (B): tip of a closed tapered polysiloxane nanotubes; red lines: (C) tips when a 0.5 M solution of sodium chloride or (D) magnesium chloride was used instead of deionized water. ... Nanotube cost, polydispersity in nanotube type, and limitations in processing and assembly methods are important barriers for some applications of single-walled nanotubes. ...

Ana Stojanovic; Sandro Olveira; Maria Fischer; Stefan Seeger

2013-06-05T23:59:59.000Z

33

Multiscale Modeling with Carbon Nanotubes  

SciTech Connect (OSTI)

Technologically important nanomaterials come in all shapes and sizes. They can range from small molecules to complex composites and mixtures. Depending upon the spatial dimensions of the system and properties under investigation computer modeling of such materials can range from equilibrium and nonequilibrium Quantum Mechanics, to force-field-based Molecular Mechanics and kinetic Monte Carlo, to Mesoscale simulation of evolving morphology, to Finite-Element computation of physical properties. This brief review illustrates some of the above modeling techniques through a number of recent applications with carbon nanotubes: nano electromechanical sensors (NEMS), chemical sensors, metal-nanotube contacts, and polymer-nanotube composites.

Maiti, A

2006-02-21T23:59:59.000Z

34

Skin-Like Prosthetic Polymer Surfaces - Energy Innovation Portal  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

mimic skin. ORNL scientists combined superhydrophobic polymer inventions with carbon nanotubes to create a self-cleaning skin-like surface material with the ability to transmit...

35

Carbon nanotube fiber spun from wetted ribbon  

DOE Patents [OSTI]

A fiber of carbon nanotubes was prepared by a wet-spinning method involving drawing carbon nanotubes away from a substantially aligned, supported array of carbon nanotubes to form a ribbon, wetting the ribbon with a liquid, and spinning a fiber from the wetted ribbon. The liquid can be a polymer solution and after forming the fiber, the polymer can be cured. The resulting fiber has a higher tensile strength and higher conductivity compared to dry-spun fibers and to wet-spun fibers prepared by other methods.

Zhu, Yuntian T; Arendt, Paul; Zhang, Xiefei; Li, Qingwen; Fu, Lei; Zheng, Lianxi

2014-04-29T23:59:59.000Z

36

Carbon Nanotubes  

Science Journals Connector (OSTI)

A broad review of the structure and properties of carbon nanotubes is presented. Particular emphasis is given to ... dimensional density of states predicted for single-wall nanotubes of small diameter. The eviden...

M. S. Dresselhaus; G. Dresselhaus…

2000-01-01T23:59:59.000Z

37

Carbon-nanotube-based membranes for water desalination by membrane distillation.  

E-Print Network [OSTI]

??This work investigates ways to fabricate composite macro-structures made of carbon nanotubes in combination with polymers and metals to enhance membrane lifespan and performance. Carbon… (more)

Dumee, Ludovic

2011-01-01T23:59:59.000Z

38

Graphane Nanotubes  

Science Journals Connector (OSTI)

Graphane Nanotubes ... A possible reaction path to GN(10,10)-A is suggested by the reaction of single-walled carbon nanotube (10,10) + H2; the indications are that the GN(10,10)-A can be made at low temperature and high partial pressure of H2 gas from the corresponding nanotube. ...

Xiao-Dong Wen; Tao Yang; Roald Hoffmann; N. W. Ashcroft; Richard L. Martin; Sven P. Rudin; Jian-Xin Zhu

2012-06-30T23:59:59.000Z

39

Inorganic nanotubes  

Science Journals Connector (OSTI)

...Terrones and Humberto Terrones Inorganic nanotubes Reshef Tenne 1 C. N. R. Rao 2 1 Department...discovery of carbon fullerenes and carbon nanotubes, it was hypothesized that nanoparticles...not be stable against folding and form nanotubes and fullerene-like structures: IF...

2004-01-01T23:59:59.000Z

40

& Nanotubes Polytwistane  

E-Print Network [OSTI]

& Nanotubes Polytwistane Shiblee R. Barua,[a] Henrik Quanz,[b] Martin Olbrich,[c] Peter R with ethano (ethane-1,2-diyl) bridges to create a new chiral, C2-symmetric hydrocarbon nanotube called of C(sp3 )Ă?H units, all of which are chemically equivalent. The polytwistane nanotube has the smallest

Trauner, Dirk

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

Tailoring the Thermoelectric Behavior of Electrically Conductive Polymer Composites  

E-Print Network [OSTI]

fabrication temperatures. These concerns have led research efforts into electrically conductive polymer composites prepared in ambient conditions from aqueous solutions. By combining polymer latex with carbon nanotubes (CNT), electrical conductivity can...

Moriarty, Gregory P.

2013-05-21T23:59:59.000Z

42

Nanotube junctions  

DOE Patents [OSTI]

The present invention comprises a new nanoscale metal-semiconductor, semiconductor-semiconductor, or metal-metal junction, designed by introducing topological or chemical defects in the atomic structure of the nanotube. Nanotubes comprising adjacent sections having differing electrical properties are described. These nanotubes can be constructed from combinations of carbon, boron, nitrogen and other elements. The nanotube can be designed having different indices on either side of a junction point in a continuous tube so that the electrical properties on either side of the junction vary in a useful fashion. For example, the inventive nanotube may be electrically conducting on one side of a junction and semiconducting on the other side. An example of a semiconductor-metal junction is a Schottky barrier. Alternatively, the nanotube may exhibit different semiconductor properties on either side of the junction. Nanotubes containing heterojunctions, Schottky barriers, and metal-metal junctions are useful for microcircuitry.

Crespi, Vincent Henry (Darien, IL); Cohen, Marvin Lou (Berkeley, CA); Louie, Steven Gwon Sheng (Berkeley, CA); Zettl, Alexander Karlwalter (Kensington, CA)

2003-01-01T23:59:59.000Z

43

CX-008497: Categorical Exclusion Determination  

Broader source: Energy.gov [DOE]

Ultra-High Conductivity Umbilicals: Polymer Nanotube Umbilicals (PNUs) CX(s) Applied: A9, A11, B3.6 Date: 07/18/2012 Location(s): Texas Offices(s): National Energy Technology Laboratory

44

CX-008498: Categorical Exclusion Determination  

Broader source: Energy.gov [DOE]

Ultra-High Conductivity Umbilicals: Polymer Nanotube Umbilicals (PNUs) CX(s) Applied: A9, B3.6 Date: 07/18/2012 Location(s): Texas Offices(s): National Energy Technology Laboratory

45

SiC Nanotubes  

Science Journals Connector (OSTI)

In most cases, the silicon carbide nanotubes have been fabricated with assistance of some templates. Unlike carbon nanotubes, the silicon carbide nanotubes contain two types of elements, silicon,...

Jiyang Fan; Paul K. Chu

2014-01-01T23:59:59.000Z

46

Carbon Nanotubes.  

E-Print Network [OSTI]

?? Carbon nanotubes have extraordinary mechanical, electrical, thermal andoptical properties. They are harder than diamond yet exible, have betterelectrical conductor than copper, but can also… (more)

Fredriksson, Tore

2014-01-01T23:59:59.000Z

47

Thermoelectric Behavior of Flexible Organic Nanocomposites with Carbon Nanotubes  

E-Print Network [OSTI]

There have been significant researches about thermoelectric behaviors by applying carbon nanotube (CNT)/polymer nanocomposites. Due to its thermally disconnected but electrically connected junctions between CNTs, the thermoelectric properties were...

Choi, Kyung Who

2013-12-03T23:59:59.000Z

48

Heteroporphyrin nanotubes and composites  

DOE Patents [OSTI]

Heteroporphyrin nanotubes, metal nanostructures, and metal/porphyrin-nanotube composite nanostructures formed using the nanotubes as photocatalysts and structural templates, and the methods for forming the nanotubes and composites.

Shelnutt, John A. (Tijeras, NM); Medforth, Craig J. (Winters, CA); Wang, Zhongchun (Albuquerque, NM)

2007-05-29T23:59:59.000Z

49

Coated carbon nanotube array electrodes  

DOE Patents [OSTI]

The present invention provides conductive carbon nanotube (CNT) electrode materials comprising aligned CNT substrates coated with an electrically conducting polymer, and the fabrication of electrodes for use in high performance electrical energy storage devices. In particular, the present invention provides conductive CNTs electrode material whose electrical properties render them especially suitable for use in high efficiency rechargeable batteries. The present invention also provides methods for obtaining surface modified conductive CNT electrode materials comprising an array of individual linear, aligned CNTs having a uniform surface coating of an electrically conductive polymer such as polypyrrole, and their use in electrical energy storage devices.

Ren, Zhifeng (Newton, MA); Wen, Jian (Newton, MA); Chen, Jinghua (Chestnut Hill, MA); Huang, Zhongping (Belmont, MA); Wang, Dezhi (Wellesley, MA)

2008-10-28T23:59:59.000Z

50

Ultrafast Nonlinear Spectroscopy of Semiconducting Carbon Nanotubes  

E-Print Network [OSTI]

metallic nanotubes . . . . . . . . . . . . . . . . . Carbon2 Carbon Nanotubes Physical and ElectronicStructure of Carbon Nanotubes . . . . . . . . . .

Graham, Matthew Werden

2010-01-01T23:59:59.000Z

51

Ultrafast Nonlinear Spectroscopy of Semiconducting Carbon Nanotubes  

E-Print Network [OSTI]

2 Carbon Nanotubes Physical andElectronic Structure of Carbon Nanotubes . . . . . . . . . .Photophysics in Semiconducting Carbon Nanotubes . . . . .

Graham, Matthew Werden

2010-01-01T23:59:59.000Z

52

Joining and Scission in the Self-Assembly of Nanotubes from DNATiles Axel Ekani-Nkodo,1,2  

E-Print Network [OSTI]

, with an energy barrier Esc 180kBT. DNA nanotubes are thus uniquely accessible equilibrium polymers that enableJoining and Scission in the Self-Assembly of Nanotubes from DNATiles Axel Ekani-Nkodo,1,2 Ashish observations of tile-based DNA self-assembly in solution using fluorescent nanotubes composed of a single tile

Fygenson, Deborah Kuchnir

53

Covalently Linked DNA Nanotubes  

Science Journals Connector (OSTI)

SEM analyses of the nanotubes generated according to Scheme 2 further support the suggested folding of the 2D cross-linked DNA array into the nanotube structure. ... Here, we report a modular approach to DNA nanotube synthesis that provides access to geometrically well-defined triangular and square-shaped DNA nanotubes. ... and assembly of carbon nanotubes, and in nanotube-based DNA sensing and sepns. ...

Ofer I. Wilner; Anja Henning; Bella Shlyahovsky; Itamar Willner

2010-03-17T23:59:59.000Z

54

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

55

Carbon nanotube yarn strain sensors This article has been downloaded from IOPscience. Please scroll down to see the full text article.  

E-Print Network [OSTI]

Carbon nanotube yarn strain sensors This article has been downloaded from IOPscience. Please scroll Nanotechnology 21 (2010) 305502 (5pp) doi:10.1088/0957-4484/21/30/305502 Carbon nanotube yarn strain sensors nanotube (CNT) based sensors are often fabricated by dispersing CNTs into different types of polymer

Zhu, Yuntian T.

56

An Atomistic Study of the Mechanical Behavior of Carbon Nanotubes and Nanocomposite Interfaces  

E-Print Network [OSTI]

The research presented in this dissertation pertains to the evaluation of stiffness of carbon nanotubes (CNTs) in a multiscale framework and modeling of the interfacial mechanical behavior in CNT-polymer nanocomposites. The goal is to study...

Awasthi, Amnaya P.

2011-02-22T23:59:59.000Z

57

Toward High Performance Thermoset/Carbon Nanotube Sheet Nanocomposites via Resistive Heating Assisted Infiltration and Cure  

Science Journals Connector (OSTI)

Thermoset/carbon nanotube (CNT) sheet nanocomposites were successfully fabricated by resistive heating assisted infiltration and cure (RHAIC) of the polymer matrix resin. Resistive heating takes advantage of the electrical and thermal conductivity of CNTs ...

Jae-Woo Kim; Godfrey Sauti; Emilie J. Siochi; Joseph G. Smith; Russell A. Wincheski; Roberto J. Cano; John W. Connell; Kristopher E. Wise

2014-10-17T23:59:59.000Z

58

Modifying Nanotubes Chemistry and Electronics of Carbon Nanotubes  

E-Print Network [OSTI]

Modifying Nanotubes Chemistry and Electronics of Carbon Nanotubes Go Together Ernesto Joselevich* Keywords: chemical reactivity · electronic structure · molecular electronics · nanotechnology · nanotubes yield mixtures of metallic and semi- conducting nanotubes, extensive re- search has been devoted

Joselevich, Ernesto

59

Thermal boundary resistance between single-walled carbon nanotubes and surrounding matrices  

E-Print Network [OSTI]

Thermal boundary resistance between single-walled carbon nanotubes and surrounding matrices Carl Keywords: carbon nanotube, thermal boundary resistance, molecular dynamics 1 #12;I. INTRODUCTION the thermal conductivity of insulating materials15,16 . The mechanical strength and light weight of polymers

Maruyama, Shigeo

60

Silica Supported Single-Walled Carbon Nanotubes as a Modifier in Polyethylene Composites  

E-Print Network [OSTI]

Silica Supported Single-Walled Carbon Nanotubes as a Modifier in Polyethylene Composites Neal D. Mc.interscience.wiley.com). ABSTRACT: Composites have been made from single- wall carbon nanotubes in a polyethylene (PE) matrix: additives; composites; conducting polymers; nanocomposites; polyethylene INTRODUCTION Polyethylene (PE

Resasco, Daniel

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

Passively harmonic mode locked erbium doped fiber soliton laser with carbon nanotubes based  

E-Print Network [OSTI]

Passively harmonic mode locked erbium doped fiber soliton laser with carbon nanotubes based. Tokumoto, H. Kataura, and Y. Achiba, "Sub-200-fs pulsed erbium- doped fiber laser using a carbon nanotube fs erbium-doped fiber laser mode locked with a cellulose polymer film containing single-wall carbon

Turitsyn, Sergei K.

62

Lithium Insertion into Anatase Nanotubes  

Science Journals Connector (OSTI)

Lithium Insertion into Anatase Nanotubes ... Improving the Performance of Titania Nanotube Battery Materials by Surface Modification with Lithium Phosphate ...

V. Gentili; S. Brutti; L.J. Hardwick; A.R. Armstrong; S. Panero; P.G. Bruce

2012-11-01T23:59:59.000Z

63

Soft-Matter Nanotubes  

Science Journals Connector (OSTI)

This chapter provides an overview over the extended area of surfactant nanotubes research, covering theoretical as well as experimental ... is dedicated to the dynamic properties of lipid nanotubes, their role in...

Tatsiana Lobovkina; Aldo Jesorka; Björn Önfelt; Jan Lagerwall…

2011-01-01T23:59:59.000Z

64

Carbon nanotube nanoelectrode arrays  

DOE Patents [OSTI]

The present invention relates to microelectode arrays (MEAs), and more particularly to carbon nanotube nanoelectrode arrays (CNT-NEAs) for chemical and biological sensing, and methods of use. A nanoelectrode array includes a carbon nanotube material comprising an array of substantially linear carbon nanotubes each having a proximal end and a distal end, the proximal end of the carbon nanotubes are attached to a catalyst substrate material so as to form the array with a pre-determined site density, wherein the carbon nanotubes are aligned with respect to one another within the array; an electrically insulating layer on the surface of the carbon nanotube material, whereby the distal end of the carbon nanotubes extend beyond the electrically insulating layer; a second adhesive electrically insulating layer on the surface of the electrically insulating layer, whereby the distal end of the carbon nanotubes extend beyond the second adhesive electrically insulating layer; and a metal wire attached to the catalyst substrate material.

Ren, Zhifeng (Newton, MA); Lin, Yuehe (Richland, WA); Yantasee, Wassana (Richland, WA); Liu, Guodong (Fargo, ND); Lu, Fang (Burlingame, CA); Tu, Yi (Camarillo, CA)

2008-11-18T23:59:59.000Z

65

Paraconductivity in carbon nanotubes  

Science Journals Connector (OSTI)

We report the calculation of paraconductivity in carbon nanotubes above the superconducting transition temperature. The complex behavior of paraconductivity depending upon the tube radius, temperature, and magnetic field strength is analyzed. The results are qualitatively compared with recent experimental observations in carbon nanotubes of an inherent transition to the superconducting state and pronounced thermodynamic fluctuations above Tc. The application of our results to single-wall and multiwall carbon nanotubes as well as ropes of nanotubes is discussed.

D. V. Livanov and A. A. Varlamov

2002-09-27T23:59:59.000Z

66

Nanomechanics of carbon nanotubes  

Science Journals Connector (OSTI)

...nanotechnology II Nanomechanics of carbon nanotubes Andras Kis 1 * Alex Zettl 2 3 * * Authors...important potential applications of carbon nanotubes are related to their mechanical properties...characterization of the mechanical properties of nanotubes includes a rich variety of experiments...

2008-01-01T23:59:59.000Z

67

Polymer Electrolyte and Polymer Battery  

Science Journals Connector (OSTI)

Generally the polymer electrolyte of the polymer battery is classified into two kinds of the electrolyte: One is a dry-type electrolyte composed of a polymer matrix and...21.1. Fig....

Toshiyuki Osawa; Michiyuki Kono

2009-01-01T23:59:59.000Z

68

Resonant Raman spectroscopy of nanotubes  

Science Journals Connector (OSTI)

...Raman spectroscopy in carbons: from nanotubes to diamond compiled by Andrea C. Ferrari...Robertson Resonant Raman spectroscopy of nanotubes Christian Thomsen 1 Stephanie Reich 2...The experimental situation in carbon nanotubes is reviewed in view of these criteria...

2004-01-01T23:59:59.000Z

69

Electronic Properties of Carbon Nanotubes  

E-Print Network [OSTI]

P. Avouris, in Carbon Nanotubes M. S. Dresselhaus, P.Physics of Carbon Nanotubes S. V. Rotkin, S. Subramoney,Properties of Carbon Nanotubes Philip G. Collins 1 and

Collins, Philip G

2008-01-01T23:59:59.000Z

70

Electronic Properties of Carbon Nanotubes  

E-Print Network [OSTI]

P. Avouris, in Carbon Nanotubes M. S. Dresselhaus, P.in Applied Physics of Carbon Nanotubes S. V. Rotkin, S.Electronic Properties of Carbon Nanotubes Philip G. Collins

Collins, Philip G

2008-01-01T23:59:59.000Z

71

Carbon nanotubes for organic electronics.  

E-Print Network [OSTI]

??This thesis investigated the use of carbon nanotubes as active components in solution processible organic semiconductor devices. We investigated the use of functionalized carbon nanotubes… (more)

Goh, Roland Ghim Siong

2008-01-01T23:59:59.000Z

72

Carbon nanotubes : synthesis, characterization, and applications  

E-Print Network [OSTI]

Surface-Attached Carbon Nanotubes. Ind. Eng. Chem. Res. ,Structure of Carbon Nanotubes. Journal of Physical ChemistryP.G. and P. Avouris, Nanotubes for Electronics. Scientific

Deck, Christian Peter

2009-01-01T23:59:59.000Z

73

Electrochemical implications of defects in carbon nanotubes  

E-Print Network [OSTI]

in Hollow Carbon Nanotubes . . . . . . 4.3.2.1 IncreasingThe electrochemistry of carbon nanotubes. Journal of Thethe sidewalls of carbon nanotubes. Journal of the American

Hoefer, Mark

2012-01-01T23:59:59.000Z

74

Thermal Management Using Carbon Nanotubes - Energy Innovation...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Thermal Management Using Carbon Nanotubes Oak Ridge National Laboratory Contact ORNL About This Technology Vertically Aligned Carbon Nanotubes Vertically Aligned Carbon Nanotubes...

75

A cell nanoinjector based on carbon nanotubes  

E-Print Network [OSTI]

based on carbon nanotubes Xing Chen *|| , Andras Kis †|| ,that uses carbon nanotubes to deliver cargo into cells. Astrength (2, 3), carbon nanotubes (CNTs) are ideal nanoscale

Chen, Xing; Kis, Andras; Zettl, Alex; Bertozzi, Carolyn R.

2008-01-01T23:59:59.000Z

76

Electron transport through single carbon nanotubes  

E-Print Network [OSTI]

through single carbon nanotubes G. Chai Apollo Technologies,aligned multi-wall carbon nanotubes (CNT). Embedding of CNTsuse of fiber coated carbon nanotubes makes the handling of

Chai, G

2008-01-01T23:59:59.000Z

77

Ultrafast Nonlinear Spectroscopy of Semiconducting Carbon Nanotubes  

E-Print Network [OSTI]

Exciton binding energies in carbon nanotubes from two-photonExciton binding energies in carbon nanotubes from two-photonoptical transition energies of carbon nanotubes: the role of

Graham, Matthew Werden

2010-01-01T23:59:59.000Z

78

Carbon nanotubes : synthesis, characterization, and applications  

E-Print Network [OSTI]

of carbon nanotubes by transmission electron energy-lossEnergy Gaps in "Metallic" Single-Walled Carbon Nanotubes.nanotubes, absorbance increases with increasing light energy

Deck, Christian Peter

2009-01-01T23:59:59.000Z

79

Semiconductor Nanowires and Nanotubes for Energy Conversion  

E-Print Network [OSTI]

Nanowires and Nanotubes for Energy Conversion By MelissaNanowires and Nanotubes for Energy Conversion by MelissaNanowires and Nanotubes for Energy Conversion by Melissa

Fardy, Melissa Anne

2010-01-01T23:59:59.000Z

80

Carbon Nanotubes: Bearing Stress Like Never Before  

E-Print Network [OSTI]

Hart, A.J. (2013). Carbon Nanotubes: Present and Futureproduction of carbon nanotubes, and can be used to producesynthesized properly, and carbon nanotubes are no exception.

Limaye, Aditya

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

Electrochemical implications of defects in carbon nanotubes  

E-Print Network [OSTI]

parameters. Fullerenes, Nanotubes and Carbon Nanostructures,in Hollow Carbon Nanotubes . . . . . . 4.3.2.1 Increasingmigration in graphite and carbon nanotubes. Chemical Physics

Hoefer, Mark

2012-01-01T23:59:59.000Z

82

Carbon Nanotube and Graphene Nanoelectromechanical Systems  

E-Print Network [OSTI]

Carbon Nanotubes on the2.4 Static Deformation of Carbon Nanotubes . . . . . .3.2 Field Emission from Carbon Nanotubes: Electrostatics

Aleman, Benjamin Jose

2011-01-01T23:59:59.000Z

83

Defects and Disorder in Carbon Nanotubes  

E-Print Network [OSTI]

Perebeinos, V. (2008) Carbon Nanotubes 111 423. Bachilo, S.M. & Mceuen, P. L. (2008) Carbon Nanotubes 111 Biro, L. P. ,sectional structure of carbon nanotubes. Fullerenes '96.

Collins, Philip G

2010-01-01T23:59:59.000Z

84

Electron transport through single carbon nanotubes  

E-Print Network [OSTI]

transport through single carbon nanotubes G. Chai Apolloaligned multi-wall carbon nanotubes (CNT). Embedding of CNTsuse of fiber coated carbon nanotubes makes the handling of

Chai, G

2008-01-01T23:59:59.000Z

85

Reinforced Carbon Nanotubes.  

DOE Patents [OSTI]

The present invention relates generally to reinforced carbon nanotubes, and more particularly to reinforced carbon nanotubes having a plurality of microparticulate carbide or oxide materials formed substantially on the surface of such reinforced carbon nanotubes composite materials. In particular, the present invention provides reinforced carbon nanotubes (CNTs) having a plurality of boron carbide nanolumps formed substantially on a surface of the reinforced CNTs that provide a reinforcing effect on CNTs, enabling their use as effective reinforcing fillers for matrix materials to give high-strength composites. The present invention also provides methods for producing such carbide reinforced CNTs.

Ren, Zhifen (Newton, MA); Wen, Jian Guo (Newton, MA); Lao, Jing Y. (Chestnut Hill, MA); Li, Wenzhi (Brookline, MA)

2005-06-28T23:59:59.000Z

86

Deposition of Platinum Nanoparticles on Carbon Nanotubes by Supercritical Fluid Method  

SciTech Connect (OSTI)

Carbon nanotube-supported platinum nanoparticles with a 5-15 nm diameter size range can be synthesized by hydrogen reduction of platinum(II) acetylacetonate in methanol modified supercritical carbon dioxide. XPS and XRD spectra indicate that the carbon nanotubes contain zero-valent platinum metal and high-resolution TEM images show that the visible lattice fringes of the Pt particles are crystallites. Carbon nanotubes synthesized with 25% by weight of Pt nanoparticles exhibit a higher activity for hydrogenation of benzene compared with a commercial carbon black platinum catalyst. The carbon nanotube-supported Pt nanocatalyst can be reused at least six times for the hydrogenation reaction without losing activity. The carbon nanotube-supported Pt nanoparticles are also highly active for electrochemical oxidation of methanol and for reduction of oxygen suggesting their potential use as a new electrocatalyst for polymer electrode fuel cell applications.

Yen, Clive; Cui, Xiaoli; Pan, H. B.; Wang, S.; Lin, Yuehe; Wai, Chien M.

2005-11-05T23:59:59.000Z

87

Conductive indium-tin oxide nanowire and nanotube arrays made by electrochemically assisted deposition in template membranes: switching  

E-Print Network [OSTI]

Conductive indium-tin oxide nanowire and nanotube arrays made by electrochemically assisted-step electrochemically assisted deposition (EAD) process inside Au-plugged anodic aluminium oxide and polycarbonate electrodes in dye-sensi- tized2,6­11 and polymer12 solar cells, fillers in transparent and conductive polymer

88

Fluidic nanotubes and devices  

DOE Patents [OSTI]

Fluidic nanotube devices are described in which a hydrophilic, non-carbon nanotube, has its ends fluidly coupled to reservoirs. Source and drain contacts are connected to opposing ends of the nanotube, or within each reservoir near the opening of the nanotube. The passage of molecular species can be sensed by measuring current flow (source-drain, ionic, or combination). The tube interior can be functionalized by joining binding molecules so that different molecular species can be sensed by detecting current changes. The nanotube may be a semiconductor, wherein a tubular transistor is formed. A gate electrode can be attached between source and drain to control current flow and ionic flow. By way of example an electrophoretic array embodiment is described, integrating MEMs switches. A variety of applications are described, such as: nanopores, nanocapillary devices, nanoelectrophoretic, DNA sequence detectors, immunosensors, thermoelectric devices, photonic devices, nanoscale fluidic bioseparators, imaging devices, and so forth.

Yang, Peidong (El Cerrito, CA); He, Rongrui (El Cerrito, CA); Goldberger, Joshua (Berkeley, CA); Fan, Rong (El Cerrito, CA); Wu, Yiying (Albany, CA); Li, Deyu (Albany, CA); Majumdar, Arun (Orinda, CA)

2010-01-10T23:59:59.000Z

89

Families of carbon nanotubes: Graphyne-based nanotubes  

Science Journals Connector (OSTI)

New families of carbon single-walled nanotubes are proposed and their electronic structures are investigated. These nanotubes, called graphynes, result from the elongation of covalent interconnections of graphite-based nanotubes by the introduction of yne groups. Analogously to ordinary nanotubes, armchair, zigzag, and chiral graphyne nanotubes are possible. We here predict the electronic properties of these unusual nanotubes using tight-binding and ab initio density functional methods. Of the three graphyne nanotube families analyzed here, two provide metallic behavior for armchair tubes and either metallic or semiconducting behavior for zigzag nanotubes. A diameter- and chirality-independent band gap is predicted for the other investigated graphyne family, as well as an oscillatory dependence of the effective mass on nanotube diameter.

V. R. Coluci; S. F. Braga; S. B. Legoas; D. S. Galvăo; R. H. Baughman

2003-07-30T23:59:59.000Z

90

Electric field manipulation of polymer nanocomposites: processing and investigation of their physical characteristics  

E-Print Network [OSTI]

is to achieve a good homogenous dispersion of carbon nanofibers (CNFs) and single wall carbon nanotubes (SWNTs) in the polymer matrix; the second step is to manipulate the well-dispersed CNFs and SWNTs in polymers by using an AC electric field. Different...

Banda, Sumanth

2009-05-15T23:59:59.000Z

91

Self-assembling functionalized single-walled carbon nanotubes  

E-Print Network [OSTI]

Single-walled carbon nanotubes Carbon nanotubes (CNTs) arescale synthesis of carbon nanotubes." Nature, Vol.358, 220-Ropes of Metallic Carbon Nanotubes." Science, Vol.273(5274),

Gao, Yan

2011-01-01T23:59:59.000Z

92

Optical dichroism in nanotubes  

Science Journals Connector (OSTI)

Utilizing the line-group symmetry of single-wall nanotubes, we have assigned their electron-energy bands by symmetry-based quantum numbers. The selection rules for optical absorption are presented in terms of these quantum numbers. Different interband transitions become allowed as the polarization of incident light is varied, and we predict a substantial optical dichroism. We suggest how to observe this effect in experiments on a single nanotube, and how it can be used to control quantum transport in nanotubes to obtain information about the structure.

I. Božovi?; N. Božovi?; M. Damnjanovi?

2000-09-15T23:59:59.000Z

93

Tunable multiwalled nanotube resonator  

DOE Patents [OSTI]

A tunable nanoscale resonator has potential applications in precise mass, force, position, and frequency measurement. One embodiment of this device consists of a specially prepared multiwalled carbon nanotube (MWNT) suspended between a metal electrode and a mobile, piezoelectrically controlled contact. By harnessing a unique telescoping ability of MWNTs, one may controllably slide an inner nanotube core from its outer nanotube casing, effectively changing its length and thereby changing the tuning of its resonance frequency. Resonant energy transfer may be used with a nanoresonator to detect molecules at a specific target oscillation frequency, without the use of a chemical label, to provide label-free chemical species detection.

Jensen, Kenneth J; Girit, Caglar O; Mickelson, William E; Zettl, Alexander K; Grossman, Jeffrey C

2013-11-05T23:59:59.000Z

94

Nanotube resonator devices  

DOE Patents [OSTI]

A fully-functional radio receiver fabricated from a single nanotube is being disclosed. Simultaneously, a single nanotube can perform the functions of all major components of a radio: antenna, tunable band-pass filter, amplifier, and demodulator. A DC voltage source, as supplied by a battery, can power the radio. Using carrier waves in the commercially relevant 40-400 MHz range and both frequency and amplitude modulation techniques, successful music and voice reception has been demonstrated. Also disclosed are a radio transmitter and a mass sensor using a nanotube resonator device.

Jensen, Kenneth J; Zettl, Alexander K; Weldon, Jeffrey A

2014-05-06T23:59:59.000Z

95

ELECTRONIC TRANSPORT IN NANOTUBES AND THROUGH JUNCTIONS OF NANOTUBES  

Science Journals Connector (OSTI)

This chapter briefly reviews the electronic properties of single-wall carbon nanotubes as described by the ?-electron tight- ... to the study of quantum transport in carbon nanotubes. The electronic properties an...

PH. LAMBIN; F. TRIOZON; V. MEUNIER

2006-01-01T23:59:59.000Z

96

Boron nitride nanotubes  

DOE Patents [OSTI]

Boron nitride nanotubes are prepared by a process which includes: (a) creating a source of boron vapor; (b) mixing the boron vapor with nitrogen gas so that a mixture of boron vapor and nitrogen gas is present at a nucleation site, which is a surface, the nitrogen gas being provided at a pressure elevated above atmospheric, e.g., from greater than about 2 atmospheres up to about 250 atmospheres; and (c) harvesting boron nitride nanotubes, which are formed at the nucleation site.

Smith, Michael W. (Newport News, VA); Jordan, Kevin (Newport News, VA); Park, Cheol (Yorktown, VA)

2012-06-06T23:59:59.000Z

97

Chlorination of carbon nanotubes  

Science Journals Connector (OSTI)

We report ab initio density functional theory calculations for chlorinated single-wall carbon nanotubes and investigate the atomic structure, energetics, and electronic structure of the chlorinated nanotubes, as well as the energetics of the desorption reaction. We find that the Cl atoms should be adsorbed in pairs and thus focus on doubly chlorinated nanotubes. Using the terminology of arene substitution patterns, ortho and para configurations are the most stable. The physisorption is preferable to the chemisorption in large-diameter nanotubes. The impurity states appear near the Fermi level EF in the electronic structure and may alter the electronic properties considerably. The bonding character for adsorption outside the nanotube is mainly covalent, but inside it consists of physical bonding. The adsorption of several Cl atoms inside a carbon nanotube leads to the formation of a charged Cl chain. Our calculated desorption barrier of ?1.4 eV per Cl atom pair indicates that the cleansing by chlorination is a less damaging alternative with removable residue.

Dogan Erbahar and Savas Berber

2012-02-21T23:59:59.000Z

98

EMSL - polymers  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

polymers en Structures and Stabilities of (MgO)n Nanoclusters. http:www.emsl.pnl.govemslwebpublicationsstructures-and-stabilities-mgon-nanoclusters

99

Organic modification of carbon nanotubes  

Science Journals Connector (OSTI)

The organic modification of carbon nanotubes is a novel research field being developed ... and newest progress of organic modification of carbon nanotubes are reviewed from two aspects: organic covalent modificat...

Luqi Liu; Zhixin Guo; Liming Dai; Daoben Zhu

2002-03-01T23:59:59.000Z

100

Irradiation Stability of Carbon Nanotubes  

E-Print Network [OSTI]

Ion irradiation of carbon nanotubes is a tool that can be used to achieve modification of the structure. Irradiation stability of carbon nanotubes was studied by ion and electron bombardment of the samples. Different ion species at various energies...

Aitkaliyeva, Assel

2010-01-14T23:59:59.000Z

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

Optical transitions in carbon nanotubes  

Science Journals Connector (OSTI)

Analytical expressions for the optical matrix elements of semiconducting carbon nanotubes are obtained for different polarizations of the incident light. It is shown that, for the light polarized along the nanotube axis and transitions between the extrema of electronic subbands, the optical matrix element only weakly depends on the nanotube chirality and excitation energy. It is found that, for the light polarized in the plane perpendicular to the nanotube axis, both v2?c1 and v1?c2 transitions are allowed.

S. V. Goupalov

2005-11-03T23:59:59.000Z

102

Elastic Modulus of Polypyrrole Nanotubes  

Science Journals Connector (OSTI)

The first measurements of the tensile elastic modulus of polypyrrole nanotubes are presented. The nanotubes were mechanically tested in three points bending using atomic force microscopy. The elastic tensile modulus was deduced from force-curve measurements on different nanotubes with outer diameter ranging between 35 and 160 nm. It is shown that the elastic modulus strongly increases when the thickness or outer diameter of polypyrrole nanotubes decreases.

Stéphane Cuenot; Sophie Demoustier-Champagne; Bernard Nysten

2000-08-21T23:59:59.000Z

103

Plastic Deformations of Carbon Nanotubes  

Science Journals Connector (OSTI)

Although the elastic properties of a carbon nanotube are nearly independent of wrapping indices, we show that the onset of plastic deformation depends very strongly on the wrapping index. An (n,0) nanotube has an elastic limit nearly twice that of an (n,n) tube with the same radius. Such great variation has important consequences for structural applications of carbon nanotubes. In addition, the remnant bond rotations remaining after strain release strongly affect the electronic structure of the distorted nanotube.

Peihong Zhang; Paul E. Lammert; Vincent H. Crespi

1998-12-14T23:59:59.000Z

104

Nitrogen-Doped Graphene-Rich Catalysts Derived from Heteroatom Polymers for Oxygen Reduction in Nonaqueous Lithium–O2 Battery Cathodes  

Science Journals Connector (OSTI)

In this work, we present a synthesis approach for nitrogen-doped graphene-sheet-like nanostructures via the graphitization of a heteroatom polymer, in particular, polyaniline, under the catalysis of a cobalt species using multiwalled carbon nanotubes (...

Gang Wu; Nathan H. Mack; Wei Gao; Shuguo Ma; Ruiqin Zhong; Jiantao Han; Jon K. Baldwin; Piotr Zelenay

2012-10-04T23:59:59.000Z

105

Controlled growth of carbon nanotubes  

Science Journals Connector (OSTI)

...Terrones Controlled growth of carbon nanotubes R. Vajtai 1 B. Q. Wei 2 P. M. Ajayan...Rouge, LA 70803-5901, USA Carbon nanotubes have extraordinary mechanical and electronic...state-of-the-art account of tailored nanotube growth. To provide these properties...

2004-01-01T23:59:59.000Z

106

Materials science Nanotubes get hard  

E-Print Network [OSTI]

Materials science Nanotubes get hard under pressure Proc. Natl Acad. Sci. USA doi:10.1073/pnas.0405877101 (2004) When Zhongwu Wang et al. squeezed carbon nanotubes in a diamond anvil cell, they made nanotubes into diamond itself: the carbon material formed under compression at room temperature seems

Downs, Robert T.

107

Carbon Nanotubes for Data Processing  

E-Print Network [OSTI]

Carbon Nanotubes for Data Processing Joerg Appenzeller, T. J. Watson Research Center, IBM Research.2 Electronic Structure of Graphene 4 2.3 Electronic Structure of Carbon Nanotubes 4 2.4 Transport Properties 6 2.5 Contacts 9 3 Synthesis of Carbon Nanotubes 10 3.1 Synthetic Methods 10 3.2 Growth Mechanisms 12

Joselevich, Ernesto

108

CARBON NANOTUBE TRANSISTORS: AN EVALUATION  

E-Print Network [OSTI]

CARBON NANOTUBE TRANSISTORS: AN EVALUATION L.C. Castro, D.L. John, and D.L. Pulfrey Department A simple, non-equilibrium model is used to evaluate the likely DC performance of carbon nanotube field and transcon- ductance close to the low-quantum-capacitance limit. Keywords: Carbon nanotubes, field

Pulfrey, David L.

109

Carbon nanotubes on a substrate  

DOE Patents [OSTI]

The present invention includes carbon nanotubes whose hollow cores are 100% filled with conductive filler. The carbon nanotubes are in uniform arrays on a conductive substrate and are well-aligned and can be densely packed. The uniformity of the carbon nanotube arrays is indicated by the uniform length and diameter of the carbon nanotubes, both which vary from nanotube to nanotube on a given array by no more than about 5%. The alignment of the carbon nanotubes is indicated by the perpendicular growth of the nanotubes from the substrates which is achieved in part by the simultaneous growth of the conductive filler within the hollow core of the nanotube and the densely packed growth of the nanotubes. The present invention provides a densely packed carbon nanotube growth where each nanotube is in contact with at least one nearest-neighbor nanotube. The substrate is a conductive substrate coated with a growth catalyst, and the conductive filler can be single crystals of carbide formed by a solid state reaction between the substrate material and the growth catalyst. The present invention further provides a method for making the filled carbon nanotubes on the conductive substrates. The method includes the steps of depositing a growth catalyst onto the conductive substrate as a prepared substrate, creating a vacuum within a vessel which contains the prepared substrate, flowing H2/inert (e.g. Ar) gas within the vessel to increase and maintain the pressure within the vessel, increasing the temperature of the prepared substrate, and changing the H2/Ar gas to ethylene gas such that the ethylene gas flows within the vessel. Additionally, varying the density and separation of the catalyst particles on the conductive substrate can be used to control the diameter of the nanotubes.

Gao, Yufei [Kennewick, WA; Liu, Jun [West Richland, WA

2002-03-26T23:59:59.000Z

110

Carbon nanotube composites P. J. F. Harris*  

E-Print Network [OSTI]

Carbon nanotube composites P. J. F. Harris* Carbon nanotubes are molecular-scale tubes of graphitic. There is currently great interest in exploiting these properties by incorporating carbon nanotubes into some form/ceramic and nanotube/metal composites. This review outlines the properties of carbon nanotubes and describes

Harris, Peter J F

111

Size Effects in Carbon Nanotubes  

Science Journals Connector (OSTI)

The intershell spacing of multi-walled carbon nanotubes was determined by analyzing the high resolution transmission electron microscopy images of these nanotubes. For the nanotubes that were studied, the intershell spacing d^002 is found to range from 0.34 to 0.39 nm, increasing with decreasing tube diameter. A model based on the results from real space image analysis is used to explain the variation in intershell spacings obtained from reciprocal space periodicity analysis. The increase in intershell spacing with decreased nanotube diameter is attributed to the high curvature, resulting in an increased repulsive force, associated with the decreased diameter of the nanotube shells.

C.-H. Kiang; M. Endo; P. M. Ajayan; G. Dresselhaus; M. S. Dresselhaus

1998-08-31T23:59:59.000Z

112

Impurity screening in carbon nanotubes  

Science Journals Connector (OSTI)

Nanotube geometry determines electronic structure and thus impurity screening. A metallic carbon nanotube could effectively screen a charged impurity, while a semiconducting carbon nanotube could not. The ability to screen a long-range Coulomb field is mainly determined by whether there are free carriers in the subbands nearest the Fermi level. The detailed screening properties are sensitive to the impurity position, and the tubular structure (such as radius and chiral angle). Strong, short-wavelength Friedel oscillations at long distances are found to exist only in metallic armchair nanotubes. They are relatively obvious for a smaller armchair nanotube, and could survive at room temperature.

M. F. Lin and D. S. Chuu

1997-08-15T23:59:59.000Z

113

Magnetoconductance of carbon nanotubes  

Science Journals Connector (OSTI)

As a result of the interaction between the spin and the magnetic field (B), special step structures are predicted to exist in the ballistic magnetoconductance of carbon nanotubes. The electronic structure of a carbon nanotube drastically changes from a metal (semiconductor) to a semiconductor (metal) during the variation of the magnetic flux. When the spin-B interaction is neglected, the Fermi level only touches the conductance and valence bands of a metallic nanotube. This paramagnetic interaction could make the subbands cross and intersect with the Fermi level within a certain magnetic-flux range; the ballistic magnetoconductance thus exhibits step structures. Such special structures are expected to be observable at low temperature (<1 K) and bias voltage (<0.1 mV). Moreover there exists another effect, the doping effect, which could lead to step structures even without the spin-B interaction.

M. F. Lin and Kenneth W. -K. Shung

1995-03-15T23:59:59.000Z

114

Helical nanotubes of hexagonal boron nitride  

Science Journals Connector (OSTI)

......Physical: Full-length Papers Helical nanotubes of hexagonal boron nitride Masami Terauchi...Hongo, Bunkyo-ku, Tokyo 113, Japan Nanotubes of hexagonal boron nitride (h-BN...discovered. hexagonal boron nitride,|nanotube,|nanoball,|amorphous boron| C......

Masami Terauchi; Michiyoshi Tanaka; Hirofumi Matsuda; Masatoshi Takeda; Kaoru Kimura

1997-01-01T23:59:59.000Z

115

Microstructure of metal-filled carbon nanotubes  

Science Journals Connector (OSTI)

......Microstructure of metal-filled carbon nanotubes Shoichi Toh 1 Kenji Kaneko 2 Yasuhiko...are usually required to produce carbon nanotubes (CNTs) and play important roles during...mechanisms. metal filling|MPCVD|carbon|nanotube|palladium|microstructure| Microstructure......

Shoichi Toh; Kenji Kaneko; Yasuhiko Hayashi; Tomoharu Tokunaga; Won-Jin Moon

2004-04-01T23:59:59.000Z

116

A method for characterizing carbon nanotubes  

Science Journals Connector (OSTI)

......Letter A method for characterizing carbon nanotubes Toshie Yaguchi 1 Takahiro Sato 1 Takeo...spectroscopy of a multi-walled carbon nanotube (MWCNT) at elevated temperatures were...spectroscopy|multi&hyphen|walled carbon nanotube|specimen&hyphen|heating holder......

Toshie Yaguchi; Takahiro Sato; Takeo Kamino; Yoshifumi Taniguchi; Kenichi Motomiya; Kazuyuki Tohji; Atsuo Kasuya

2001-07-01T23:59:59.000Z

117

Carbon Nanotubes: Bearing Stress Like Never Before  

E-Print Network [OSTI]

A.J. (2013). Carbon Nanotubes: Present and Future CommercialP.M. (2008). Carbon Nanotubes. A. Jorio, G. Dresselhaus, &V.N. (2004). Carbon Nanotubes: properties and application.

Limaye, Aditya

2013-01-01T23:59:59.000Z

118

Defects and Disorder in Carbon Nanotubes  

E-Print Network [OSTI]

Perebeinos, V. (2008) Carbon Nanotubes 111 423. Bachilo, S.P. L. (2008) Carbon Nanotubes 111 Biro, L. P. , Khanh, N.structure of carbon nanotubes. Fullerenes '96. Oxford, UK.

Collins, Philip G

2010-01-01T23:59:59.000Z

119

Carbon nanotubes : synthesis, characterization, and applications  

E-Print Network [OSTI]

fibers, carbon nanotubes, and carbon capsule structures canand multi-walled nanotubes and carbon fiber, and occurs withMulti- walled carbon nanotubes”, Carbon, v.43, pp.2608-2617,

Deck, Christian Peter

2009-01-01T23:59:59.000Z

120

Growth and structure of -lactalbumin nanotubes  

Science Journals Connector (OSTI)

Nanotubes are formed after partial hydrolysis of the milk protein -lactalbumin. This scattering study presents dimensions of the -lactalbumin nanotubes and a model of their growth.

Graveland-Bikker, J.F.

2006-03-12T23:59:59.000Z

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

Functionalized carbon nanotubes and nanofibers for biosensing...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

carbon nanotubes and nanofibers for biosensing applications. Functionalized carbon nanotubes and nanofibers for biosensing applications. Abstract: This review summarizes the recent...

122

Functionalizing Nanotubes for Biomedical Applications - Donghui...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Functionalizing Nanotubes for Biomedical Applications Donghui Zhang, LSU Chemistry Department Carbon nanotubes (CNT) are one dimensional nano-structures with novel materials...

123

Electrical Transport in Carbon Nanotubes and Graphene  

E-Print Network [OSTI]

Introduction to Carbon Nanotubes and Graphene Single wallCarbon nanotubes and graphene are the most popular Carbonin the Normal Metal – Graphene – Superconductor Junctions

Liu, Gang

2010-01-01T23:59:59.000Z

124

Carbon nanotubes : synthesis, characterization, and applications  

E-Print Network [OSTI]

around Surface-Attached Carbon Nanotubes. Ind. Eng. Chem.the flexural rigidity of carbon nanotube ensembles. AppliedNanotechnology in Carbon Materials. Acta Metallurgica, 1997.

Deck, Christian Peter

2009-01-01T23:59:59.000Z

125

Charge Pumping in Carbon Nanotubes  

Science Journals Connector (OSTI)

We demonstrate charge pumping in semiconducting carbon nanotubes by a traveling potential wave. From the observation of pumping in the nanotube insulating state we deduce that transport occurs by packets of charge being carried along by the wave. By tuning the potential of a side gate, transport of either electron or hole packets can be realized. Prospects for the realization of nanotube based single-electron pumps are discussed.

P. J. Leek; M. R. Buitelaar; V. I. Talyanskii; C. G. Smith; D. Anderson; G. A. C. Jones; J. Wei; D. H. Cobden

2005-12-13T23:59:59.000Z

126

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

127

Buckling and Topological Defects in Graphene and Carbon Nanotubes  

E-Print Network [OSTI]

4 Plasticity in Carbon Nanotubes 4.1Ultimate strength of carbon nanotubes: a theoretical study”.dynamics in superplastic nanotubes”. In: Phys. Rev. Lett.

Chen, Shuo

2012-01-01T23:59:59.000Z

128

Self-assembling functionalized single-walled carbon nanotubes  

E-Print Network [OSTI]

scale synthesis of carbon nanotubes." Nature, Vol.358, 220-Ropes of Metallic Carbon Nanotubes." Science, Vol.273(5274),of single- wall carbon nanotubes. Process, product, and

Gao, Yan

2011-01-01T23:59:59.000Z

129

Electrochemical Synthesis and Structural Characterization of Titania Nanotubes  

E-Print Network [OSTI]

of Organized Arrays of Nanotubes/Nanopores . . . . . . . . .for the Formation of Organized Nanotubes/Nanopores Nanotubenanotube length for titania nanotubes synthesized in 0.15 M

Nguyen, Que Anh

2010-01-01T23:59:59.000Z

130

Self-assembling functionalized single-walled carbon nanotubes  

E-Print Network [OSTI]

Gibbs free energy and the number of nanotubes per cluster. DNumber of nanotubes per cluster (p) Figure distrib Energyenergies increase quickly, on the contrary, when more nanotubes

Gao, Yan

2011-01-01T23:59:59.000Z

131

Buckling and Topological Defects in Graphene and Carbon Nanotubes  

E-Print Network [OSTI]

4 Plasticity in Carbon Nanotubes 4.1Ultimate strength of carbon nanotubes: a theoretical study”.formation energy in carbon nanotubes and graphene”. In:

Chen, Shuo

2012-01-01T23:59:59.000Z

132

Thermoelectric power in carbon nanotubes  

SciTech Connect (OSTI)

The theoretical results for the temperature dependence of the thermoelectric power of graphite and semimetal carbon nanotubes are reported. In the calculations, the cylindrical superatomic range structure of nanotubes is taken into account. The Boltzmann equation and the {pi}-electron model of semimetal carbon nanotubes are used. The basic parameters of the calculation are the concentration of electrons, the Fermi energy, and the energy of the local level associated with the cylindrical structure of carbon nanotubes. The theoretical results are compared with the available experimental data.

Mavrinskiy, A. V., E-mail: mavrinsky@gmail.com; Baitinger, E. M. [Chelyabinsk State Pedagogical University (Russian Federation)

2009-04-15T23:59:59.000Z

133

Carbon nanotube IR detectors (SV)  

SciTech Connect (OSTI)

Sandia National Laboratories (Sandia) and Lockheed Martin Corporation (LMC) collaborated to (1) evaluate the potential of carbon nanotubes as channels in infrared (IR) photodetectors; (2) assemble and characterize carbon nanotube electronic devices and measure the photocurrent generated when exposed to infrared light;(3) compare the performance of the carbon nanotube devices with that of traditional devices; and (4) develop and numerically implement models of electronic transport and opto-electronic behavior of carbon nanotube infrared detectors. This work established a new paradigm for photodetectors.

Leonard, F. L.

2012-03-01T23:59:59.000Z

134

Nanotubes, Nanowires and Nano-electronics  

E-Print Network [OSTI]

5 FOCUS Nanotubes, Nanowires and Nano-electronics Carbon nanotubes are single molecules of carbonNa colleagues are working on both single-walled and multiple- walled nanotubes (layers of cylinders inside each industrial uses. One potential application for single-walled nanotubes is electron emitters for flat

Pulfrey, David L.

135

Carbon nanotubes : synthesis, characterization, and applications  

E-Print Network [OSTI]

carbon nanotube ceramic matrix composites. Acta Materialia,ceramic matrix material. These fiber reinforced composites

Deck, Christian Peter

2009-01-01T23:59:59.000Z

136

Polymer Brushes  

Science Journals Connector (OSTI)

...DOLAN, A.K., EFFECT OF EXCLUDED VOLUME ON POLYMER DISPERSANT ACTION, PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES...prop-erties of a tagged subset of chain units. One example is the nuclear magnetic resonance (NMR) studies by Blum and co-workers...

S. T. MILNER

1991-02-22T23:59:59.000Z

137

Self-cleaning skin-like prosthetic polymer surfaces  

DOE Patents [OSTI]

An external covering and method of making an external covering for hiding the internal endoskeleton of a mechanical (e.g., prosthetic) device that exhibits skin-like qualities is provided. The external covering generally comprises an internal bulk layer in contact with the endoskeleton of the prosthetic device and an external skin layer disposed about the internal bulk layer. The external skin layer is comprised of a polymer composite with carbon nanotubes embedded therein. The outer surface of the skin layer has multiple cone-shaped projections that provide the external skin layer with superhydrophobicity. The carbon nanotubes are preferably vertically aligned between the inner surface and outer surface of the external skin layer in order to provide the skin layer with the ability to transmit heat. Superhydrophobic powders may optionally be used as part of the polymer composite or applied as a coating to the surface of the skin layer to enhance superhydrophobicity.

Simpson, John T. (Clinton, TN); Ivanov, Ilia N. (Knoxville, TN); Shibata, Jason (Manhattan Beach, CA)

2012-03-27T23:59:59.000Z

138

Solitons in carbon nanotubes  

Science Journals Connector (OSTI)

The symmetries of spontaneous lattice distortions in carbon nanotubes are investigated. When the degeneracy of the ground states remains discrete, there are solitons or domain walls connecting the different symmetry-broken vaccua. These solitons, similarly to the case of polyacetelene, are fractionally charged states. In addition to the topological domain walls, there are polaron states with discrete energies within the energy gap. The energies and shapes of these localized midgap states should be accessible via scanning tunneling microscopy spectroscopy.

Claudio Chamon

2000-07-15T23:59:59.000Z

139

Biexciton Stability in Carbon Nanotubes  

Science Journals Connector (OSTI)

We have applied the quantum Monte Carlo method and tight-binding modeling to calculate the binding energy of biexcitons in semiconductor carbon nanotubes for a wide range of diameters and chiralities. For typical nanotube diameters we find that biexciton binding energies are much larger than previously predicted from variational methods, which easily brings the biexciton binding energy above the room temperature threshold.

David Kammerlander; Deborah Prezzi; Guido Goldoni; Elisa Molinari; Ulrich Hohenester

2007-09-21T23:59:59.000Z

140

RELATIVE CHIRAL ABUNDANCES OF CARBON NANOTUBES DETERMINED BYRELATIVE CHIRAL ABUNDANCES OF CARBON NANOTUBES DETERMINED BYRELATIVE CHIRAL ABUNDANCES OF CARBON NANOTUBES DETERMINED BYRELATIVE CHIRAL ABUNDANCES OF CARBON NANOTUBES DETERMINED BY RESONANT RAMAN  

E-Print Network [OSTI]

RELATIVE CHIRAL ABUNDANCES OF CARBON NANOTUBES DETERMINED BYRELATIVE CHIRAL ABUNDANCES OF CARBON NANOTUBES DETERMINED BYRELATIVE CHIRAL ABUNDANCES OF CARBON NANOTUBES DETERMINED BYRELATIVE CHIRAL ABUNDANCES OF CARBON NANOTUBES DETERMINED BY RESONANT RAMAN SPECTROSCOPY USING A TUNABLE DYE LASERRESONANT

Mellor-Crummey, John

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

Towards improved spinnability of chemical vapor deposition generated multi-walled carbon nanotubes  

E-Print Network [OSTI]

P. J. F. 1999 Carbon nanotubes and related structures: newof vapor grown carbon nanotubes and single wall nanotubes, Eto Carbon Materials in Carbon Nanotubes: Preparation and

McKee, Gregg Sturdivant Burke

2008-01-01T23:59:59.000Z

142

Triplet absorption in carbon nanotubes: a TD-DFT study  

E-Print Network [OSTI]

We predict properties of triplet excited states in single-walled carbon nanotubes (CNTs) using a time-dependent density-functional theory (TD-DFT). We show that the lowest triplet state energy in CNTs to be about 0.2-0.3 eV lower than the lowest singlet states. Like in $\\pi$-conjugated polymers, the lowest CNT triplets are spatially localized. These states show strong optical absorption at about 0.5-0.6 eV to the higher lying delocalized triplet states. These results demonstrate striking similarity of the electronic features between CNTs and $\\pi$-conjugated polymers and provide explicit guidelines for spectroscopic detection of CNT triplet states.

Sergei Tretiak

2007-02-13T23:59:59.000Z

143

Conductive Polymers  

SciTech Connect (OSTI)

Electroluminescent devices such as light-emitting diodes (LED) and high-energy density batteries. These new polymers offer cost savings, weight reduction, ease of processing, and inherent rugged design compared to conventional semiconductor materials. The photovoltaic industry has grown more than 30% during the past three years. Lightweight, flexible solar modules are being used by the U.S. Army and Marine Corps for field power units. LEDs historically used for indicator lights are now being investigated for general lighting to replace fluorescent and incandescent lights. These so-called solid-state lights are becoming more prevalent across the country since they produce efficient lighting with little heat generation. Conductive polymers are being sought for battery development as well. Considerable weight savings over conventional cathode materials used in secondary storage batteries make portable devices easier to carry and electric cars more efficient and nimble. Secondary battery sales represent an $8 billion industry annually. The purpose of the project was to synthesize and characterize conductive polymers. TRACE Photonics Inc. has researched critical issues which affect conductivity. Much of their work has focused on production of substituted poly(phenylenevinylene) compounds. These compounds exhibit greater solubility over the parent polyphenylenevinylene, making them easier to process. Alkoxy substituted groups evaluated during this study included: methoxy, propoxy, and heptyloxy. Synthesis routes for production of alkoxy-substituted poly phenylenevinylene were developed. Considerable emphasis was placed on final product yield and purity.

Bohnert, G.W.

2002-11-22T23:59:59.000Z

144

Dynamic Conductance of Carbon Nanotubes  

Science Journals Connector (OSTI)

The dynamic conductance of carbon nanotubes was investigated using the nonequilibrium Green's function formalism within the context of a tight-binding model. Specifically, we have studied the ac response of tubes of different helicities, both with and without defects, and an electronic heterojunction. Because of the induced displacement currents, the dynamic conductance of the nanotubes differs significantly from the dc conductance displaying both capacitive and inductive responses. The important role of photon-assisted transport through nanotubes is revealed and its implications for experiments discussed.

Christopher Roland; Marco Buongiorno Nardelli; Jian Wang; Hong Guo

2000-03-27T23:59:59.000Z

145

Supersymmetric twisting of carbon nanotubes  

E-Print Network [OSTI]

We construct exactly solvable models of twisted carbon nanotubes via supersymmetry, by applying the matrix Darboux transformation. We derive the Green's function for these systems and compute the local density of states. Explicit examples of twisted carbon nanotubes are produced, where the back-scattering is suppressed and bound states are present. We find that the local density of states decreases in the regions where the bound states are localized. Dependence of bound-state energies on the asymptotic twist of the nanotubes is determined. We also show that each of the constructed unextended first order matrix systems possesses a proper nonlinear hidden supersymmetric structure with a nontrivial grading operator.

Vit Jakubsky; Mikhail S. Plyushchay

2012-02-28T23:59:59.000Z

146

Chiral Conductivities of Nanotubes  

Science Journals Connector (OSTI)

Chiral conductivities of nanotubes are examined within the framework of the Boltzmann transport equation. Electron transport along a chiral trajectory is decomposed into current components along the tubule axis and its circumference. Within a constant relaxation time approximation, these components are derived from the expectation values of Fermi velocities by using the appropriate operators and the wave functions at the Fermi level obtained by first-principles calculations. As a typical example, the chiral current of a doped BC2N tubule is illustrated, and the strength of the induced magnetic field is discussed.

Yoshiyuki Miyamoto; Steven G. Louie; Marvin L. Cohen

1996-03-18T23:59:59.000Z

147

Polarons in Carbon Nanotubes  

Science Journals Connector (OSTI)

We use ab initio total-energy calculations to predict the existence of polarons in semiconducting carbon nanotubes (CNTs). We find that the CNTs' band edge energies vary linearly and the elastic energy increases quadratically with both radial and with axial distortions, leading to the spontaneous formation of polarons. Using a continuum model parametrized by the ab initio calculations, we estimate electron and hole polaron lengths, energies, and effective masses and analyze their complex dependence on CNT geometry. Implications of polaron effects on recently observed electro- and optomechanical behavior of CNTs are discussed.

M. Verissimo-Alves; R. B. Capaz; Belita Koiller; Emilio Artacho; H. Chacham

2001-04-09T23:59:59.000Z

148

Functionalized boron nitride nanotubes  

DOE Patents [OSTI]

A plasma treatment has been used to modify the surface of BNNTs. In one example, the surface of the BNNT has been modified using ammonia plasma to include amine functional groups. Amine functionalization allows BNNTs to be soluble in chloroform, which had not been possible previously. Further functionalization of amine-functionalized BNNTs with thiol-terminated organic molecules has also been demonstrated. Gold nanoparticles have been self-assembled at the surface of both amine- and thiol-functionalized boron nitride Nanotubes (BNNTs) in solution. This approach constitutes a basis for the preparation of highly functionalized BNNTs and for their utilization as nanoscale templates for assembly and integration with other nanoscale materials.

Sainsbury, Toby; Ikuno, Takashi; Zettl, Alexander K

2014-04-22T23:59:59.000Z

149

Influence of amine-grafted multi-walled carbon nanotubes on physical and rheological properties of PMMA-based nanocomposites  

SciTech Connect (OSTI)

In this work, poly(methyl methacrylate) (PMMA) was grafted onto amine treated multi-walled carbon nanotubes (NH-MWNTs) and the physical and rheological properties of the NH-MWNTs-g-PMMA nanocomposites were investigated. The graft reaction of NH-MWNTs and the PMMA matrix was confirmed from the change of the N{sub 1S} peaks, including those of amine oxygen and amide oxygen, by X-ray photoelectron spectroscopy (XPS). The thermal and mechanical properties of the NH-MWNT-g-PMMA nanocomposites were enhanced by the graft reaction between NH-MWNTs and PMMA matrix. In addition, the viscosity of the nanocomposites was increased with the addition of NH-MWNTs. Storage (G') and loss modulus (G'') were significantly increased by increase in the NH-MWNT content compared to acid-treated MWNTs/PMMA nanocomposites. This increase was attributed to the strong interaction by the grafting reaction between NH-MWNTs and the PMMA matrix. - Graphical abstract: This describes the increase of mechanical properties in NH-MWNTs-g-PMMA hybrid composites with different NH-MWNT contents. Highlights: > Aminized carbon nanotubes are used as reinforcement for poly(methylmethacrylate). > Poly(methylmethacrylate) is grafted on aminized carbon nanotubes by thermal reaction. > Grafting of carbon nanotubes and polymer provide enhanced physical properties. > It was due to the strong interaction between carbon nanotubes and polymer matrix.

Kim, Ki-Seok [Department of Chemistry, Inha University, Incheon 402-751 (Korea, Republic of); Park, Soo-Jin, E-mail: sjpark@inha.ac.kr [Department of Chemistry, Inha University, Incheon 402-751 (Korea, Republic of)

2011-11-15T23:59:59.000Z

150

Viscosity of polymer solutions  

Science Journals Connector (OSTI)

Viscosity of polymer solutions ... Abstracts for Volume 5A, Number 2. This program contains three components: "Density of Liquids", "Viscosity of Liquids", and "Viscosity of Polymer Solutions". ...

Gary L. Bertrand

1992-01-01T23:59:59.000Z

151

Carbon nanotubes Growth of Single-Walled Carbon Nanotubes from Sharp  

E-Print Network [OSTI]

Carbon nanotubes Growth of Single-Walled Carbon Nanotubes from Sharp Metal Tips Julio A. Rodri Banhart* The nucleation and growth of single-walled carbon nanotubes is observed in situ in a transmission a region of high surface curvature, spontaneous nucleation and growth of single-walled carbon nanotubes

Nordlund, Kai

152

Nanotube Formation: Researchers Learn To Control The Dimensions Of Metal Oxide Nanotubes  

E-Print Network [OSTI]

Nanotube Formation: Researchers Learn To Control The Dimensions Of Metal Oxide Nanotubes ScienceDaily (Aug. 29, 2007) -- Moving beyond carbon nanotubes, researchers are developing insights-walled inorganic nanotubes could be useful in a range of nanotechnology applications that require precise control

Nair, Sankar

153

Elastic modulus of viral nanotubes  

Science Journals Connector (OSTI)

We report an experimental and theoretical study of the radial elasticity of tobacco mosaic virus (TMV) nanotubes. An atomic force microscope tip is used to apply small radial indentations to deform TMV nanotubes. The initial elastic response of TMV nanotubes can be described by finite-element analysis in 5nm indentation depths and Hertz theory in 1.5nm indentation depths. The derived radial Young’s modulus of TMV nanotubes is 0.92±0.15GPa from finite-element analysis and 1.0±0.2GPa from the Hertz model, which are comparable with the reported axial Young’s modulus of 1.1GPa [Falvo et al., Biophys. J. 72, 1396 (1997)].

Yue Zhao; Zhibin Ge; Jiyu Fang

2008-09-17T23:59:59.000Z

154

The structure of trititanate nanotubes  

Science Journals Connector (OSTI)

Combining information from X-ray diffraction, selected-area electron diffraction, high-resolution transmission electron microscopy and image simulation, a structural model is derived for trititanate nanotubes.

Chen, Q.

2002-07-30T23:59:59.000Z

155

Carbon nanotubes in new materials  

Science Journals Connector (OSTI)

Studies of materials consisting of carbon nanotubes or containing them have been analyzed and generalized. Classification of these materials is proposed, their general features and main types are considered, and individual examples are presented. The bibliography includes 372 references.

Eduard G Rakov

2013-01-01T23:59:59.000Z

156

Increasing carbon nanotube forest density  

E-Print Network [OSTI]

The outstanding mechanical, electrical, thermal, and morphological properties of individual carbon nanotubes (CNTs) open up exciting potential applications in a wide range of fields. One such application is replacing the ...

McCarthy, Alexander P

2014-01-01T23:59:59.000Z

157

Emerging Applications of Carbon Nanotubes  

E-Print Network [OSTI]

On the basis of their unique electrical and mechanical properties, carbon nanotubes (CNTs) have attracted great attention in recent years. A diverse array of methods has been developed to modify CNTs and to assemble them ...

Schnorr, Jan Markus

158

Carbon nanotube electron source technology  

Science Journals Connector (OSTI)

The carbon nanotube embodies a unique combination of properties which make it potentially an extraordinary field emission electron source. These properties include small tip radii (and small source size), high el...

Kenneth Teo

2007-03-01T23:59:59.000Z

159

Structure-activity relationship of antioxidants for inhibitors of linoleic acid hydroperoxide-induced toxicity in cultured human umbilical vein endothelial cells  

Science Journals Connector (OSTI)

Structure-activity relationship of antioxidants for the protective effects on linoleic acid hydroperoxide (LOOH)-induced toxicity were examined in cultured human umbilical vein endothelial cells. ?-Tocopherol,...

Takao Kaneko; Naomichi Baba; Mitsuyoshi Matsuo

2001-01-01T23:59:59.000Z

160

Optical properties of carbon nanotubes  

Science Journals Connector (OSTI)

Using the extended Hubbard model and sum-over-state method, we have calculated the linear polarizability ? and the third-order nonlinear polarizability ? for carbon nanotubes with finite lengths. We find that the chiral symmetry of nanotubes with finite length has a great effect on their optical properties. For example, the finite length (n,m) tubes with n-m being not a multiple of 3, will have smaller ? and much smaller ? values than other finite length tubes.

Xiangang Wan; Jinming Dong; D. Y. Xing

1998-09-15T23:59:59.000Z

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

Excitations of Bose Fluids in Nanotubes  

Science Journals Connector (OSTI)

We discuss the excitation spectra of Bose fluids in the quasi-one dimensional geometries which can be found in interstitial channels of nanotubes and inside individual nanotubes. We compute the collective excitat...

E. S. Hernández; M. W. Cole

2002-01-01T23:59:59.000Z

162

Polygonal model for layered inorganic nanotubes  

E-Print Network [OSTI]

Multiwalled inorganic nanotubes with circular cross sections must have either an incoherent interface or a large amount of strain. However, nanotubes with a polygonal cross section can have a coherent interface with ...

Tibbetts, Kevin

163

Torsional instability of chiral carbon nanotubes  

E-Print Network [OSTI]

In this work we investigate the presence of a torsional instability in single-wall carbon nanotubes which causes small diameter chiral carbon nanotubes to show natural torsion. To obtain insight into the nature of this ...

Dresselhaus, Mildred

164

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

165

Underwater Sound Generation Using Carbon Nanotube Projectors  

Science Journals Connector (OSTI)

The application of solid-state fabricated carbon nanotube sheets as thermoacoustic projectors is extended from air to underwater applications, thereby providing surprising results. While the acoustic generation efficiency of a liquid immersed nanotube ...

Ali E. Aliev; Marcio D. Lima; Shaoli Fang; Ray H. Baughman

2010-05-27T23:59:59.000Z

166

On the metallicity of some carbon nanotubes .  

E-Print Network [OSTI]

??Some zigzag and all armchair single-walled carbon nanotubes are believed to behave as metals. However, recent experimental results suggest that only armchair single-walled carbon nanotubes… (more)

Gómez Jeria, Juan Sebastián

2007-01-01T23:59:59.000Z

167

Carbon Nanotubes: Bearing Stress Like Never Before  

E-Print Network [OSTI]

of the mechanical properties of carbon nanotube– polymercomposites. Carbon, 44. 1624 – 1652 doi: 10.1016/j.R.H. , & Hart, A.J. (2013). Carbon Nanotubes: Present and

Limaye, Aditya

2013-01-01T23:59:59.000Z

168

A carbon nanotube bearing and Stodola rotor  

E-Print Network [OSTI]

A nano-scale rotor supported on a cantilevered multi-wall carbon nanotube (MWNT) shaft (Stodola configuration) is proposed. The nanotube is also expected to function as the bearing, since individual walls of a MWNT are not ...

Cook, Eugene Hightower

2008-01-01T23:59:59.000Z

169

Carbon Nanotubes Based Nanoelectrode Arrays: Fabrication, Evaluation...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Arrays: Fabrication, Evaluation and Application in Voltammetric Analysis. Carbon Nanotubes Based Nanoelectrode Arrays: Fabrication, Evaluation and Application in Voltammetric...

170

Carbon Nanotubes: Bearing Stress Like Never Before  

E-Print Network [OSTI]

energy effects that cause aggregation in the first place to attaching mol- ecules to the outside of carbon nanotubes

Limaye, Aditya

2013-01-01T23:59:59.000Z

171

Hydrogen storage in multilayer carbon nanotubes  

Science Journals Connector (OSTI)

Multilayer carbon nanotubes obtained by pyrolysis and mechanical activation of plant-derived amorphous carbon are excellent sorbents for hydrogen.

D. V. Onishchenko; V. P. Reva; V. G. Kuryavyi

2013-05-01T23:59:59.000Z

172

Molecular recognition using nanotube-adsorbed polymer complexes  

E-Print Network [OSTI]

We first reported the selective detection of single nitric oxide (NO) molecules using a specific DNA sequence of d(AT) 15 oligonucleotides, adsorbed to an array of near infrared fluorescent semiconducting single-walled ...

Zhang, Jingqing, Ph. D. Massachusetts Institute of Technology

2013-01-01T23:59:59.000Z

173

E-Print Network 3.0 - aligned carbon nanotubes Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

nanotubes Search Powered by Explorit Topic List Advanced Search Sample search results for: aligned carbon nanotubes...

174

Symmetry groups of single-wall nanotubes  

Science Journals Connector (OSTI)

An approach to the determination of the symmetry groups of structural analogs of single-wall carbon nanotubes using ideas in color symmetry theory is described. The line group structures of the symmetry groups of BN, BC3, BCN and BC2N nanotubes are identified. An extension of the method to address nanotubes with non-hexagonal symmetry is also presented.

De Las Pe?as, M.L.A.N.

2013-11-26T23:59:59.000Z

175

Bamboo-like boron nitride nanotubes  

Science Journals Connector (OSTI)

......Full-length paper Bamboo-like boron nitride nanotubes Renzhi Ma Yoshio Bando Tadao Sato To...305-0044, Japan Bamboo-like boron nitride nanotubes (BN-NTs), synthesized from melamine...the temperature gradient applied in the nanotube growth process was considered as the......

Renzhi Ma; Yoshio Bando; Tadao Sato

2002-03-01T23:59:59.000Z

176

Local Energy Gap in Deformed Carbon Nanotubes  

Science Journals Connector (OSTI)

......Local Energy Gap in Deformed Carbon Nanotubes Ken-ichi Sasaki 1 *) Yoshiyuki...gap along the axis of a deformed nanotube. We compare our energy gap results...experimental data on energy gaps in nanotubes and peapods. We also discuss the......

Ken-ichi Sasaki; Yoshiyuki Kawazoe; Riichiro Saito

2005-03-01T23:59:59.000Z

177

Photo-Galvano-Mechanical Phenomena in Nanotubes  

E-Print Network [OSTI]

Photo-Galvano-Mechanical Phenomena in Nanotubes Petr KraI\\ E. J. Mele2 , David Tomanek3 and Moshe elec- trical "ballistic current". The photo-currents can be generated even in centrosym- metric be also generated in semiconductor nanotubes or in higher bands of metallic nanotubes [2]. The photo

178

Controlled Placement of Individual Carbon Nanotubes  

E-Print Network [OSTI]

Controlled Placement of Individual Carbon Nanotubes Xue Ming Henry Huang, Robert Caldwell, Limin and the technology of carbon nanotubes is the controlled assembly of devices. Here, we report a technique that allows us to place a nanotube with the desired properties in a predetermined location by direct mechanical

Hone, James

179

Novel Stack Concepts: Patterned Aligned Carbon Nanotubes  

E-Print Network [OSTI]

Novel Stack Concepts: Patterned Aligned Carbon Nanotubes as Electrodes in MEAs Di-Jia Liu proprietary or confidential information #12;Objective To develop a novel aligned carbon nanotube (ACNT/mass transport and thermal conductivity through patterned nanotubes with micrometer-dimension flowfield

180

Doped Carbon Nanotubes for Hydrogen Storage  

E-Print Network [OSTI]

Doped Carbon Nanotubes for Hydrogen Storage U. S. DOE Hydrogen Program Annual Review May, 2003 structure carbon nanotube systems ·Not restricted to physisorption or chemisorption (weak covalent bond structures of doped carbon nanotubes APPROACH Based on C-H bond Dihydrogen bond H H M = + charge = - charge

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

CARBON NANOTUBE TRANSISTORS, SENSORS, AND A Dissertation  

E-Print Network [OSTI]

CARBON NANOTUBE TRANSISTORS, SENSORS, AND BEYOND A Dissertation Presented to the Faculty of Philosophy by Xinjian Zhou January 2008 #12;#12;CARBON NANOTUBE TRANSISTORS, SENSORS, AND BEYOND Xinjian Zhou, Ph. D. Cornell University 2008 Carbon nanotubes are tiny hollow cylinders, made from a single

McEuen, Paul L.

182

Scanning Probe Microscopy Studies of Carbon Nanotubes  

E-Print Network [OSTI]

Scanning Probe Microscopy Studies of Carbon Nanotubes Teri Wang Odom1 , Jason H. Hafner1 relationship between Single-Walled Carbon Nanotube (SWNT) atomic structure and electronic properties, (2, properties and application of carbon nanotube probe microscopy tips to ultrahigh resolution and chemically

Odom, Teri W.

183

Dominoes in Carbon Nanotubes  

Science Journals Connector (OSTI)

We demonstrate by molecular dynamics simulations that the domino process can be developed in single-walled carbon nanotubes (SWCNTs). Once a section of a SWCNT with an appropriate diameter (>3.5??nm) is collapsed, the successive collapse of the neighboring portions can generate a domino wave along the longitudinal direction of the tube. The wave is driven by van der Waals potential energy and its natural speed can be up to 1??km/s. Molecules inside the SWCNT can be accelerated by the domino wave and finally shot out. The finding shows for the first time that a SWCNT can be an energy supplier, which provides opportunities for designing new concept (domino-driven) nanoelectromechanical system devices.

Tienchong Chang

2008-10-21T23:59:59.000Z

184

Carbon nanotubes: from production to functional composites  

Science Journals Connector (OSTI)

In this paper, we present our work on carbon nanotubes, including our most recent results, in two important fields: production of carbon nanotubes itself and fabrication of carbon nanotube based composites with enhanced functionality. Firstly, we focus on the three main carbon nanotube production techniques, namely electric arc, laser evaporation and CVD. Based on our results, for each method the importance of the key parameters is highlighted. A comparison of production possibilities towards commercialisation concludes this section. Secondly, we report on the synthesis of a soluble and highly functional polyaniline/carbon nanotube composite and emphasise the general importance of conformational changes in order to achieve proper carbon nanotubeâ??matrix interactions.

A.M. Benito; W.K. Maser; M.T. Martinez

2005-01-01T23:59:59.000Z

185

Electroreduction of Oxygen in Polymer Electrolyte Fuel Cells by Activated Carbon Coated Cobalt Nanocrystallites Produced by Electric Arc Discharge  

Science Journals Connector (OSTI)

Electroreduction of Oxygen in Polymer Electrolyte Fuel Cells by Activated Carbon Coated Cobalt Nanocrystallites Produced by Electric Arc Discharge ... A recent review of the encapsulation of rare earth and iron group metals (Fe, Co, Ni) using electric arc discharge has been published by Saito. ... Nanotubes have been observed after activation of catalytically inactive carbon-coated Co nanocrystallites generated by electric arc discharge. ...

G. Lalande; D. Guay; J. P. Dodelet; S. A. Majetich; M. E. McHenry

1997-03-18T23:59:59.000Z

186

All carbon nanotubes are not created equal  

SciTech Connect (OSTI)

This chapter presents the various factors that enter into consideration when choosing the source of carbon nanotubes for a specific application. Carbon nanotubes are giant molecules made of pure carbon. They have captured the imagination of the scientific community by the unique structure that provides superior physical, chemical, and electrical properties. However, a surprisingly wide disparity exists between the intrinsic properties determined under ideal conditions and the properties that carbon nanotubes exhibit in real world situations. The lack of uniformity in carbon nanotube properties is likely to be the main obstacle holding back the development of carbon nanotube applications. This tutorial addresses the nonuniformity of carbon nanotube properties from the synthesis standpoint. This synthesis-related nonuniformity is on top of the intrinsic chirality distribution that gives the ~1:2 ratio of metallic to semiconducting nanotubes. From the standpoint of carbon bonding chemistry the variation in the quality and reproducibility of carbon nanotube materials is not unexpected. It is an intrinsic feature that is related to the metastability of carbon structures. The extent to which this effect is manifested in carbon nanotube formation is governed by the type and the kinetics of the carbon nanotube synthesis reaction. Addressing this variation is critical if nanotubes are to live up to the potential already demonstrated by their phenomenal physical properties.

Geohegan, David B [ORNL; Puretzky, Alexander A [ORNL; Rouleau, Christopher M [ORNL

2010-01-01T23:59:59.000Z

187

Spectroscopic Properties of Nanotube-Chromophore Hybrids  

E-Print Network [OSTI]

Recently, individual single-walled carbon nanotubes (SWNTs) functionalized with azo-benzene chromophores were shown to form a new class of hybrid nanomaterials for optoelectronics applications. Here we use a number of experimental techniques and theory to understand the binding, orientation, and nature of coupling between chromophores and the nanotubes, all of which are of relevance to future optimization of these hybrid materials. We find that the binding energy between chromophores and nanotubes depends strongly on the type of tether that is used to bind the chromophores to the nanotubes, with pyrene tethers resulting in more than 90% of the bound chromophores during processing. DFT calculations show that the binding energy of the chromophores to the nanotubes is maximized for chromophores parallel to the nanotube sidewall, even with the use of tethers; second harmonic generation shows that there is nonetheless a partial radial orientation of the chromophores on the nanotubes. We find weak electronic coupli...

Huang, Changshui; Wong, Bryan M; McGee, David J; Léonard, François; Kim, Yun Jun; Johnson, Kirsten F; Arnold, Michael S; Eriksson, Mark A; Gopalan, Padma

2013-01-01T23:59:59.000Z

188

Bimolecular recombination on carbon nanotubes  

Science Journals Connector (OSTI)

By using a suspension of single-walled carbon nanotubes in an applied electric field and measuring transient photoinduced currents the problem of contacting nanotubes in charge transport studies is circumvented; basic electronic transport properties are thus studied. It is observed that the peak photocurrent excited by a mode-locked laser pulse has a sublinear dependence on light intensity. Careful measurement of these phototransients has allowed a fit of the intensity dependence of the peak photocurrent to a bimolecular recombination model developed for the one-dimensional semiconductor that the nanotubes represent. Application of the model allows the determination of some microscopic transport properties. This has been done as concentration, electric field and excitation wavelength are varied.

J. C. Bunning; K. J. Donovan; K. Scott; M. Somerton

2005-02-14T23:59:59.000Z

189

Hydrodynamic properties of carbon nanotubes  

Science Journals Connector (OSTI)

We study water flowing past an array of single walled carbon nanotubes using nonequilibrium molecular dynamics simulations. For carbon nanotubes mounted with a tube spacing of 16.4×16.4 nm and diameters of 1.25 and 2.50 nm, respectively, we find drag coefficients in reasonable agreement with the macroscopic, Stokes-Oseen solution. The slip length is -0.11 nm for the 1.25 nm carbon nanotube, and 0.49 for the 2.50 nm tube for a flow speed of 50 m/s, respectively, and 0.28 nm for the 2.50 nm tube at 200 m/s. A slanted flow configuration with a stream- and spanwise velocity component of 100 ms-1 recovers the two-dimensional results, but exhibits a significant 88 nm slip along the axis of the tube. These results indicate that slip depends on the particular flow configuration.

J. H. Walther; T. Werder; R. L. Jaffe; P. Koumoutsakos

2004-06-04T23:59:59.000Z

190

Chiral currents in gold nanotubes  

Science Journals Connector (OSTI)

Results are presented for the electron current in gold chiral nanotubes (AuNTs). Starting from the band structure of (4,3) and (5,3) AuNTs, we find that the magnitude of the chiral currents are greater than those found in carbon nanotubes. We also calculate the associated magnetic flux inside the tubes and find this to be higher than the case of carbon nanotubes. Although (4,3) and (5,3) AuNTs carry transverse momenta of similar magnitudes, the low-bias magnetic flux carried by the former is far greater than that carried by the latter. This arises because the low-bias longitudinal current carried by a (4,3) AuNT is significantly smaller than that of a (5,3) AuNT.

D. Zs. Manrique; J. Cserti; C. J. Lambert

2010-02-04T23:59:59.000Z

191

Energetics of bent carbon nanotubes  

Science Journals Connector (OSTI)

Several junctions between different nanotubes have been constructed which preserve the C sp2 honeycomb lattice with the sole insertion of a pentagon and a heptagon. This construction bends the structure at an angle that depends on the distance between the pentagon and heptagon. The atomic structure of these systems was optimized with empirical interatomic potentials. The nanotubes on both sides of the junctions were treated as infinitely long. Local ?+? electron densities of states were computed locally in the interfacial region with a tight-binding Hamiltonian. From this, the electron energy of the junctions was computed and compared to that of the separated nanotubes. It is found that the energy of a pentagon-heptagon defect in the graphitic tubular network is around 6 eV.

V. Meunier; L. Henrard; Ph. Lambin

1998-01-15T23:59:59.000Z

192

Correlation effects in carbon nanotubes  

Science Journals Connector (OSTI)

We consider the effects of Coulomb interactions on single-wall carbon nanotubes using an on-site Hubbard interaction, u. For the (N,N) armchair tubes the low-energy theory is shown to be identical to a two-chain Hubbard model at half-filling, with an effective interaction uN=u/N. Umklapp scattering leads to gaps in the spectrum of charge and spin excitations which are exponentially small for large N. Above the gaps the intrinsic nanotube resistivity due to these scattering processes is linear in temperature, as observed experimentally. The presence of ``d-wave'' superconductivity in the two-chain Hubbard model away from half-filling suggests that doped armchair nanotubes might exhibit superconductivity with a purely electronic mechanism.

Leon Balents and Matthew P. A. Fisher

1997-05-01T23:59:59.000Z

193

Identifying and counting point defects in carbon nanotubes  

E-Print Network [OSTI]

of single-walled carbon nanotubes. J. Phys. Chem. B 103,single-walled carbon nanotubes on patterned silicon wafers.of single-walled carbon nanotubes from carbon monoxide.

Fan, Y W; Goldsmith, B R; Collins, Philip G

2005-01-01T23:59:59.000Z

194

Identifying and Counting Point Defects in Carbon Nanotubes  

E-Print Network [OSTI]

single-walled carbon nanotubes on patterned silicon wafers.of single-walled carbon nanotubes from carbon monoxide.single-walled carbon nanotubes. Science 306, 1362–1364 (

Collins, Philip G

2005-01-01T23:59:59.000Z

195

Buckling and Topological Defects in Graphene and Carbon Nanotubes  

E-Print Network [OSTI]

defect formation energy in carbon nanotubes and graphene”.Carbon Nanotubes strain e zz Defect Formation Energies fromCARBON NANOTUBES Figure 4.3: Contour plots of strain energy

Chen, Shuo

2012-01-01T23:59:59.000Z

196

Scaffolding Carbon Nanotubes into Single-Molecule Circuitry  

E-Print Network [OSTI]

tion of individual carbon nanotubes. Nano Lett. 3, 613 (C. Dekker: Enzyme-coated carbon nanotubes as single-moleculeing point defects in carbon nanotubes. Nat. Mater. 4, 906 (

Collins, Philip G

2008-01-01T23:59:59.000Z

197

Chirality effects in carbon nanotubes  

Science Journals Connector (OSTI)

We consider chirality related effects in optical, photogalvanic, and electron-transport properties of carbon nanotubes. We show that these properties of chiral nanotubes are determined by terms in the electron effective Hamiltonian describing the coupling between the electron wave vector along the tube principal axis and the orbital momentum around the tube circumference. We develop a theory of photogalvanic effects and a theory of dc electric current, which is linear in the magnetic field and quadratic in the bias voltage. Moreover, we present analytic estimations for the natural circular dichroism and magnetospatial effect in the light absorption.

E. L. Ivchenko and B. Spivak

2002-10-02T23:59:59.000Z

198

Phonon eigenvectors of chiral nanotubes  

Science Journals Connector (OSTI)

Although a commonly neglected fact, the physical properties of chiral carbon nanotubes may differ significantly from those of the usually considered, simpler achiral tubes. We show that the phonon eigenvectors, e.g., of the high-energy eigenmodes no longer fall into axial and circumferential modes as in armchair and zig-zag nanotubes. The atomic displacement may, instead, point in any tangential direction and even show an angular dependence of its direction around the circumference, as the results of ab initio calculations demonstrate.

S. Reich; C. Thomsen; P. Ordejón

2001-10-26T23:59:59.000Z

199

Phonons in narrow carbon nanotubes  

Science Journals Connector (OSTI)

Accurate calculations of the phonon dispersion relations, phonon density of states, and phonon eigenvectors of the narrow single-wall carbon nanotubes in optimized geometry are carried out. The method applied is based on the force constants for graphene which reflect the long-range character of the dynamical matrix. Further, the relaxation and symmetry imposed modifications of the force constants are performed and the calculations are carried out by means of the fully symmetry implemented POLSym code. Shortcomings of the widely used frozen phonon model are overcome. The results obtained are compared to the Raman scattering measurements on the zeolite-grown nanotubes.

Ivanka Miloševi?; Edib Dobardži?; Milan Damnjanovi?

2005-08-09T23:59:59.000Z

200

Endohedral Impurities in Carbon Nanotubes  

Science Journals Connector (OSTI)

A generalization of the Anderson model that includes pseudo-Jahn-Teller impurity coupling is proposed to describe distortions of an endohedral impurity in a carbon nanotube. Within mean-field theory, spontaneous axial symmetry breaking is found when the vibronic coupling strength g exceeds a critical value. The effective potential is found to have O(2) symmetry, in agreement with numerical calculations. For metallic zigzag nanotubes endohedrally doped with transition metals in the dilute limit, the low-energy properties of the system may display two-channel Kondo behavior; however, strong vibronic coupling is seen to exponentially suppress the Kondo energy scale.

Dennis P. Clougherty

2003-01-24T23:59:59.000Z

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

Coulomb interactions in carbon nanotubes  

Science Journals Connector (OSTI)

The effect of electron-electron interactions on the electronic properties of nonchiral single-wall carbon nanotubes is investigated by an extended Hubbard model resolved within the generalized unrestricted Hartree-Fock approximation. On-site U and nearest-neighbor u Coulomb interactions are considered in tubules with different geometries at half-filling. A phase diagram is obtained in the coordinates U and u. For the electron-electron interaction strength estimated to hold for graphite, carbon nanotubes would lie close to the boundary region between metallic and insulator density wave states. Therefore, any small external perturbation can substantially modify their electronic properties.

M. P. López Sancho; M. C. Muńoz; L. Chico

2001-04-04T23:59:59.000Z

202

Acoustoelectric Effects in Carbon Nanotubes  

Science Journals Connector (OSTI)

We report observations of acoustoelectric effects in carbon nanotubes. We excite sound in ?m long ropes of single walled carbon nanotubes suspended between two metallic contacts by applying radio-frequency electric field. The sound is detected by measuring either the dc resistance of the tubes in a region of strong temperature dependence (in the vicinity of superconducting or metal-insulator transition), or their critical current. We show that, depending on the excitation power, the vibrations produce either electron heating or phase coherence breaking.

B. Reulet; A. Yu. Kasumov; M. Kociak; R. Deblock; I. I. Khodos; Yu. B. Gorbatov; V. T. Volkov; C. Journet; H. Bouchiat

2000-09-25T23:59:59.000Z

203

Molecular jet growth of carbon nanotubes and dense vertically aligned nanotube arrays  

DOE Patents [OSTI]

A method of growing a carbon nanotube includes the step of impinging a beam of carbon-containing molecules onto a substrate to grow at least one carbon nanotube on the catalyst surface.

Eres, Gyula (Knoxville, TN) [Knoxville, TN

2010-10-12T23:59:59.000Z

204

Understanding the Nanotube Growth Mechanism: A Strategy to Control Nanotube Chirality during Chemical Vapor Deposition Synthesis  

E-Print Network [OSTI]

during chemical vapor deposition synthesis must focus on controlling the structure of the nucleated nanotube seeds. DFT and RMD simulations demonstrate the viability of using the structures of catalyst particles over which nanotube growth proceeds...

Gomez Gualdron, Diego Armando 1983-

2012-10-26T23:59:59.000Z

205

Diameter-Refined Metallic Carbon Nanotubes as Optically Tunable...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Diameter-Refined Metallic Carbon Nanotubes as Optically Tunable Transparent Conductors Home > Research > ANSER Research Highlights > Diameter-Refined Metallic Carbon Nanotubes as...

206

Biosensors Based on Carbon Nanotubes/Nickel Hexacyanoferrate...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Biosensors Based on Carbon NanotubesNickel HexacyanoferrateGlucose Oxidase Nanocomposites. Biosensors Based on Carbon NanotubesNickel HexacyanoferrateGlucose Oxidase...

207

Synthesis of supported carbon nanotubes in mineralized silica...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

supported carbon nanotubes in mineralized silica-wood composites. Synthesis of supported carbon nanotubes in mineralized silica-wood composites. Abstract: Multiwall carbon...

208

Carbon nanotubes decorated with Pt nanoparticles via electrostatic...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

nanotubes decorated with Pt nanoparticles via electrostatic self-assembly: a highly active oxygen reduction Carbon nanotubes decorated with Pt nanoparticles via electrostatic...

209

Biogenic formation of photoactive arsenic-sulfide nanotubes by...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

formation of photoactive arsenic-sulfide nanotubes by Shewanella sp. strain HN-41 . Biogenic formation of photoactive arsenic-sulfide nanotubes by Shewanella sp. strain HN-41 ....

210

Deposition of Platinum Nanoparticles on Carbon Nanotubes by Supercriti...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Deposition of Platinum Nanoparticles on Carbon Nanotubes by Supercritical Fluid Method. Deposition of Platinum Nanoparticles on Carbon Nanotubes by Supercritical Fluid Method....

211

Hydrogen-bond acidic functionalized carbon nanotubes (CNTs) with...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Hydrogen-bond acidic functionalized carbon nanotubes (CNTs) with covalently-bound hexafluoroisopropanol groups. Hydrogen-bond acidic functionalized carbon nanotubes (CNTs) with...

212

Carbon Nanotubes (CNTs) for the Development of Electrochemical...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

(CNTs) for the Development of Electrochemical Biosensors . Carbon Nanotubes (CNTs) for the Development of Electrochemical Biosensors . Abstract: Carbon nanotube (CNT) is a very...

213

Band-Gap Engineering of Carbon Nanotubes with Grain Boundaries...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Band-Gap Engineering of Carbon Nanotubes with Grain Boundaries. Band-Gap Engineering of Carbon Nanotubes with Grain Boundaries. Abstract: Structure and electronic properties of...

214

Cathodoluminescence from a device of carbon nanotube-field emission...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Cathodoluminescence from a device of carbon nanotube-field emission display with ZnO nanocluster phosphor. Cathodoluminescence from a device of carbon nanotube-field emission...

215

Quantum transport and field-induced superconductivity in carbon nanotubes.  

E-Print Network [OSTI]

?? For my thesis, I conducted experiments to investigate superconductivity and superconducting proximity effect in carbon nanotubes. The measurements are carried out on carbon nanotube… (more)

Yang, Yanfei

2010-01-01T23:59:59.000Z

216

Interlayer spacings in carbon nanotubes  

Science Journals Connector (OSTI)

Electron and x-ray-diffraction studies of nanotubes have revealed that the distances between the graphitic sheets are larger by a few percent than those in bulk graphite. The mean value of the interlayer spacings is 0.344±0.001 nm.

Yahachi Saito; Tadanobu Yoshikawa; Shunji Bandow; Masato Tomita; Takayoshi Hayashi

1993-07-15T23:59:59.000Z

217

Method for synthesizing carbon nanotubes  

DOE Patents [OSTI]

A method for preparing a precursor solution for synthesis of carbon nanomaterials, where a polar solvent is added to at least one block copolymer and at least one carbohydrate compound, and the precursor solution is processed using a self-assembly process and subsequent heating to form nanoporous carbon films, porous carbon nanotubes, and porous carbon nanoparticles.

Fan, Hongyou

2012-09-04T23:59:59.000Z

218

Reversal modes in magnetic nanotubes  

E-Print Network [OSTI]

The magnetic switching of ferromagnetic nanotubes is investigated as a function of their geometry. Two independent methods are used: Numerical simulations and analytical calculations. It is found that for long tubes the reversal of magnetization is achieved by two mechanism: The propagation of a transverse or a vortex domain wall depending on the internal and external radii of the tube.

P. Landeros; S. Allende; J. Escrig; E. Salcedo; D. Altbir; E. E. Vogel

2006-11-08T23:59:59.000Z

219

Terahertz detection and carbon nanotubes  

SciTech Connect (OSTI)

Researchers at Sandia National Laboratories, along with collaborators from Rice University and the Tokyo Institute of Technology, are developing new terahertz detectors based on carbon nanotubes that could lead to significant improvements in medical imaging, airport passenger screening, food inspection and other applications.

Leonard, Francois

2014-06-11T23:59:59.000Z

220

Terahertz detection and carbon nanotubes  

ScienceCinema (OSTI)

Researchers at Sandia National Laboratories, along with collaborators from Rice University and the Tokyo Institute of Technology, are developing new terahertz detectors based on carbon nanotubes that could lead to significant improvements in medical imaging, airport passenger screening, food inspection and other applications.

Leonard, Francois

2014-06-13T23:59:59.000Z

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

Telescopic nanotube device for hot nanolithography  

DOE Patents [OSTI]

A device for maintaining a constant tip-surface distance for producing nanolithography patterns on a surface using a telescopic nanotube for hot nanolithography. An outer nanotube is attached to an AFM cantilever opposite a support end. An inner nanotube is telescopically disposed within the outer nanotube. The tip of the inner nanotube is heated to a sufficiently high temperature and brought in the vicinity of the surface. Heat is transmitted to the surface for thermal imprinting. Because the inner tube moves telescopically along the outer nanotube axis, a tip-surface distance is maintained constant due to the vdW force interaction, which in turn eliminates the need of an active feedback loop.

Popescu, Adrian; Woods, Lilia M

2014-12-30T23:59:59.000Z

222

Nanoporous polymer electrolyte  

DOE Patents [OSTI]

A nanoporous polymer electrolyte and methods for making the polymer electrolyte are disclosed. The polymer electrolyte comprises a crosslinked self-assembly of a polymerizable salt surfactant, wherein the crosslinked self-assembly includes nanopores and wherein the crosslinked self-assembly has a conductivity of at least 1.0.times.10.sup.-6 S/cm at 25.degree. C. The method of making a polymer electrolyte comprises providing a polymerizable salt surfactant. The method further comprises crosslinking the polymerizable salt surfactant to form a nanoporous polymer electrolyte.

Elliott, Brian (Wheat Ridge, CO); Nguyen, Vinh (Wheat Ridge, CO)

2012-04-24T23:59:59.000Z

223

Electro-optical memory of a nematic liquid crystal doped by multi-walled carbon nanotubes  

E-Print Network [OSTI]

A pronounced irreversible electro-optical response (memory effect) has been recently observed for nematic liquid crystal (LC) EBBA doped by multi-walled carbon nanotubes (MWCNTs) near the percolation threshold of the MWCNTs (0.02-0.05 wt. %). It is caused by irreversible homeotropic-to-planar reorientation of LC in an electric field. This feature is explained by electro-hydrodynamically stimulated dispergation of MWCNTs in LC and by the formation of a percolation MWCNT network which acts as a spatially distributed surface stabilizing the planar state of the LC. This mechanism is confirmed by the absence of memory in the EBBA/MWCNT composites, whose original structure is fixed by a polymer. The observed effect suggests new operation modes for the memory type and bistable LC devices, as well as a method for \\textit{in situ} dispergation of carbon nanotubes in LC cells.

L. Dolgov; O. Yaroshchuk; S. Tomylko; N. Lebovka

2012-10-04T23:59:59.000Z

224

Carbon nanotubes : synthesis, characterization, and applications.  

E-Print Network [OSTI]

??Carbon nanotubes (CNTs) possess exceptional material properties, making them desirable for use in a variety of applications. In this work, CNTs were grown using two… (more)

Deck, Christian Peter

2009-01-01T23:59:59.000Z

225

Carbon Nanohoops: Molecular Templates for Precision Nanotube...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

build carbon-ring "nanohoops," molecular building blocks for the formation of carbon nanotubes. Carbon nanohoops might serve as seeds, or templates, for the efficient and...

226

Thermoelectric ŤFabrics? based on carbon nanotube composites...  

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

based on carbon nanotube composites Composite films of multi-walled carbon nanotubespolyvinylidene fluoride layered into multiple element modules, results in...

227

Raman spectroscopy of metallic carbon nanotubes  

E-Print Network [OSTI]

Metallic carbon nanotubes are one dimensional conductors that are both technologically promising for electronic applications, and scientifically interesting for studying the physics of low dimensional materials. In this ...

Farhat, Hootan

2010-01-01T23:59:59.000Z

228

Processable Cyclic Peptide Nanotubes with Tunable Interiors ...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Processable Cyclic Peptide Nanotubes with Tunable Interiors Previous Next List Rami Hourani, Chen Zhang, Rob van der Weegen, Luis Ruiz, Changyi Li, Sinan Keten, Brett A. Helms, and...

229

Nanotube Composite Anode Materials | Argonne National Laboratory  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (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....

230

Numerical simulation and modeling of carbon nanotubes.  

E-Print Network [OSTI]

??The discovery of carbon nanotubes has triggered a significant amount of interest. Since then, much research has been done on these new forms of carbon… (more)

Wong, Chee How.

2008-01-01T23:59:59.000Z

231

CHEMICAL MODIFICATION AND CHARACTERIZATION OF CARBON NANOTUBES.  

E-Print Network [OSTI]

??Carbon nanotubes (CNTs) are a relatively new allotrope of carbon that possess very unique and exciting physical characteristics. However, much is still unknown regarding their… (more)

Cassity, Kelby Brandan

2010-01-01T23:59:59.000Z

232

Synthesis and Characterization of Polymer Composites Containing Aligned Conducting Polymers and Carbon Nanotubes  

E-Print Network [OSTI]

Field effect transistor Ge Germanium HOMO Highest occupied molecular orbital I-V Current vs. Voltage ? Total thermal conductivity ?e Electronic contribution of thermal conductivity L Length xiv LC Liquid Crystal LED Light emitting diode LUMO... feasible for applications in organic light emitting diodes, photovoltaics6 and more recently, thermoelectric devices. Traditional inorganic semi-conductor materials like Bismuth (Bi), Te and Selenium (Se) deliver high thermoelectric power and deliver...

Manda, Swathi

2014-04-21T23:59:59.000Z

233

ccsd00001984, Selective production of metallic carbon nanotubes  

E-Print Network [OSTI]

ccsd­00001984, version 1 ­ 18 Oct 2004 Selective production of metallic carbon nanotubes Yasushi- type nanotubes (metallic character) evaluated using the previous Huckel-Poisson method can be applied at the tip of a nanotube in a realistic system. Setting the cross-section of a nanotube and the external #12

234

Scanning tunneling spectroscopy of suspended single-wall carbon nanotubes  

E-Print Network [OSTI]

Scanning tunneling spectroscopy of suspended single-wall carbon nanotubes B. J. LeRoy,a) S. G-wall carbon nanotubes that are freely suspended over a trench. The nanotubes were grown by chemical vapor on the freestanding portions of the nanotubes. Spatially resolved spectroscopy on the suspended portion of both

Dekker, Cees

235

Carbon Nanotube GHz Nano-Resonator Shengdong Li1  

E-Print Network [OSTI]

Carbon Nanotube GHz Nano-Resonator Shengdong Li1 , Zhen Yu1 , Sheng-Feng Yen1 , Peter J. Burke1 walled carbon nanotube. Both semiconducting and metallic nanotubes are measured. Using a semiconducting signal processing components based on carbon nanotubes. Index Terms -- Nanotechnology, Resonators, Tuning

Tang, William C

236

Hydrogen Raman shifts in carbon nanotubes from molecular dynamics simulation  

E-Print Network [OSTI]

Hydrogen Raman shifts in carbon nanotubes from molecular dynamics simulation S.J.V. Frankland *, D hydrogen in individual single-shell carbon nanotubes and nanotube ropes using a semiclassical model. The calculations predict that isolated hydrogen molecules inside of nanotubes have a Raman frequency that increases

Brenner, Donald W.

237

Method for nano-pumping using carbon nanotubes  

DOE Patents [OSTI]

The present invention relates generally to the field of nanotechnology, carbon nanotubes and, more specifically, to a method and system for nano-pumping media through carbon nanotubes. One preferred embodiment of the invention generally comprises: method for nano-pumping, comprising the following steps: providing one or more media; providing one or more carbon nanotubes, the one or more nanotubes having a first end and a second end, wherein said first end of one or more nanotubes is in contact with the media; and creating surface waves on the carbon nanotubes, wherein at least a portion of the media is pumped through the nanotube.

Insepov, Zeke (Darien, IL); Hassanein, Ahmed (Bolingbrook, IL)

2009-12-15T23:59:59.000Z

238

Sagnac interference in carbon nanotubes  

Science Journals Connector (OSTI)

The Sagnac interference mode arises when two interfering counterpropogating beams traverse a loop, but with their velocities detuned by a small amount 2u, with vR/L=vF±u. In this paper we perform a perturbative nonequilibrium calculation of Sagnac interference in single-channel wires as well as armchair nanotube loops. We study the dependence of the Sagnac conductance oscillations on temperature and interactions. We find that the Sagnac interference is not destroyed by strong interactions, but becomes weakly dependent on the velocity detuning u. In armchairs nanotubes with typical interaction strength, 0.25?g?0.5, we find that the necessary temperature for observing the interference effect, TSAG is also only weakly dependent on the interaction, and is enhanced by a factor of 8 relative to the temperature necessary for observing Fabry-Pérot interference in the same system, TFP.

Waheb Bishara; Gil Refael; Marc Bockrath

2008-10-06T23:59:59.000Z

239

Longitudinal solitons in carbon nanotubes  

Science Journals Connector (OSTI)

We present results on soliton excitations in carbon nanotubes (CNT’s) using Brenner’s many-body potential. Our numerical simulations demonstrate high soliton stability in (10,10) CNT’s. The interactions of solitons and solitary excitation with CNT defect are found to be inelastic if the excitations and defects length scales are comparable, resulting in a substantial part of soliton energy being distributed inhomogeneously over the defect bonds. In these solitary-excitation–cap collisions the local energy of a few bonds in the cap can exceed the average energy by an order of magnitude and more. This phenomenon, denoted the “Tsunami effect,” can contribute dynamically to the recently proposed “kinky chemistry.” We also present results of changes in the local density of states and variations in the atomic partial charges estimated at different time instants of the solitary-excitation Tsunami at the nanotube cap.

T. Yu. Astakhova; O. D. Gurin; M. Menon; G. A. Vinogradov

2001-06-27T23:59:59.000Z

240

Impurity resonances in carbon nanotubes  

Science Journals Connector (OSTI)

Analytical expressions are derived for the self-energies of electrons in carbon nanotubes while interacting with impurity atoms. Results are reported for armchair and zigzag tubes. It is shown that the impurity causes a bound electron donor or acceptor state beneath every semiconductor band edge. If the tubes are metallic, these bound states become resonance states. The analytical formulas give resonance shapes in good agreement with former numerical calculations.

G. D. Mahan

2004-03-17T23:59:59.000Z

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

Polarons in Suspended Carbon Nanotubes  

Science Journals Connector (OSTI)

We prove theoretically the possibility of electric-field controlled polaron formation involving flexural (bending) modes in suspended carbon nanotubes. Upon increasing the field, the ground state of the system with a single extra electron undergoes a first-order phase transition between an extended state and a localized polaron state. For a common experimental setup, the threshold electric field is only of the order of ?5×10-2??V/?m.

I. Snyman and Yu. V. Nazarov

2012-02-15T23:59:59.000Z

242

Flexure modes in carbon nanotubes  

Science Journals Connector (OSTI)

Phonons are calculated for single wall carbon nanotubes. Eigenvalues and eigenvectors are presented for armchair and zig-zag tubes. The model contains just three adjustable spring constants: two for first and second nearest neighbor directed bonds, and a third for radial bond-bending interactions. There are four low frequency modes at long wavelength: a longitudinal acoustical, a torsional mode, and two flexure modes.

G. D. Mahan and Gun Sang Jeon

2004-08-09T23:59:59.000Z

243

Rabi Waves in Carbon Nanotubes  

E-Print Network [OSTI]

QED-model for the multichain qubit system with interactions of qubits and chains between themselves on the example of the system of $\\sigma$-polarons in carbon zigzag nanotubes, interacting with quantized EM-field, is considered analytically. The possibility of experimental detection of Rabi waves in conventional stationary optical experiments for any quasi-1D system with strong electron-photon interaction is predicted.

Alla Dovlatova; Dmitry Yearchuck

2010-09-08T23:59:59.000Z

244

Fluorescent Single-Walled Carbon Nanotube Aerogels in Surfactant-free Environments  

Science Journals Connector (OSTI)

†Physical Chemistry and Applied Spectroscopy Group, Chemistry Division, ‡Center for Integrated Nanotechnologies, Materials Physics and Applications Division, §Polymers and Coatings Group, Materials Science and Technology Division, and ?National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos New Mexico 87545, United States ... single-walled carbon nanotube; fluorescence; surfactant-free; silica aerogel; nanocomposite; low-temperature ... Thus, during gelation the silica precursor molecules can penetrate the SDS assembly more readily than the DOC coating resulting in weaker PL intensities for the SDS-suspended tubes in contrast to DOC-wrapped tubes. ...

Juan G. Duque; Christopher E. Hamilton; Gautam Gupta; Scott A. Crooker; Jared. J. Crochet; Aditya Mohite; Han Htoon; Kimberly A. DeFriend Obrey; Andrew M. Dattelbaum; Stephen K. Doorn

2011-07-26T23:59:59.000Z

245

Carbon Nanotubes in a Photonic Metamaterial  

Science Journals Connector (OSTI)

Hybridization of single-walled carbon nanotubes with plasmonic metamaterials leads to photonic media with an exceptionally strong ultrafast nonlinearity. This behavior is underpinned by strong coupling of the nanotube excitonic response to the weakly radiating Fano-type resonant plasmonic modes that can be tailored by metamaterial design.

Andrey E. Nikolaenko; Francesco De Angelis; Stuart A. Boden; Nikitas Papasimakis; Peter Ashburn; Enzo Di Fabrizio; Nikolay I. Zheludev

2010-04-12T23:59:59.000Z

246

Curvilinear lattice in chiral carbon nanotubes  

Science Journals Connector (OSTI)

In this paper, the energy bands of chiral-type single-walled carbon nanotubes are studied employing a new curvilinear lattice theory and its reciprocal lattice aided by the spherical triangle theory. In this theory, the notion of a distance law is introduced ... Keywords: Bandgap, carbon nanotubes, curvilinear lattice, distance law

Ming Zang; K. K. Tamma

2004-12-01T23:59:59.000Z

247

Scaling of Excitons in Carbon Nanotubes  

Science Journals Connector (OSTI)

Light emission from carbon nanotubes is expected to be dominated by excitonic recombination. Here we calculate the properties of excitons in nanotubes embedded in a dielectric, for a wide range of tube radii and dielectric environments. We find that simple scaling relationships give a good description of the binding energy, exciton size, and oscillator strength.

Vasili Perebeinos; J. Tersoff; Phaedon Avouris

2004-06-25T23:59:59.000Z

248

Sacrificial template method of fabricating a nanotube  

DOE Patents [OSTI]

Methods of fabricating uniform nanotubes are described in which nanotubes were synthesized as sheaths over nanowire templates, such as using a chemical vapor deposition process. For example, single-crystalline zinc oxide (ZnO) nanowires are utilized as templates over which gallium nitride (GaN) is epitaxially grown. The ZnO templates are then removed, such as by thermal reduction and evaporation. The completed single-crystalline GaN nanotubes preferably have inner diameters ranging from 30 nm to 200 nm, and wall thicknesses between 5 and 50 nm. Transmission electron microscopy studies show that the resultant nanotubes are single-crystalline with a wurtzite structure, and are oriented along the <001> direction. The present invention exemplifies single-crystalline nanotubes of materials with a non-layered crystal structure. Similar "epitaxial-casting" approaches could be used to produce arrays and single-crystalline nanotubes of other solid materials and semiconductors. Furthermore, the fabrication of multi-sheath nanotubes are described as well as nanotubes having multiple longitudinal segments.

Yang, Peidong (Berkeley, CA); He, Rongrui (Berkeley, CA); Goldberger, Joshua (Berkeley, CA); Fan, Rong (El Cerrito, CA); Wu, Yi-Ying (Albany, CA); Li, Deyu (Albany, CA); Majumdar, Arun (Orinda, CA)

2007-05-01T23:59:59.000Z

249

Carbon Nanotube DNA Sensor and Sensing Mechanism  

E-Print Network [OSTI]

Carbon Nanotube DNA Sensor and Sensing Mechanism Xiaowu Tang,*,, Sarunya Bansaruntip, Nozomi; Revised Manuscript Received June 7, 2006 ABSTRACT We report the fabrication of single-walled carbon nanotube (SWNT) DNA sensors and the sensing mechanism. The simple and generic protocol for label

Le Roy, Robert J.

250

Strong, Transparent, Multifunctional, Carbon Nanotube Sheets  

Science Journals Connector (OSTI)

...anisotropic electronically conducting aerogel that can be densified into...fabricated from a nanotube aerogel (7), by Langmuir-Blodgett...from oleum (9), and by spin coating (10). We produced highly oriented...contacting nanotube sheets. The aerogel sheet regions under the aqueous...

Mei Zhang; Shaoli Fang; Anvar A. Zakhidov; Sergey B. Lee; Ali E. Aliev; Christopher D. Williams; Ken R. Atkinson; Ray H. Baughman

2005-08-19T23:59:59.000Z

251

Theory of carbon nanotube growth  

Science Journals Connector (OSTI)

The kinetics of carbon nanotube growth under arc discharge conditions were investigated over different length and time scales using complementary numerical techniques. Relaxation by ab initio molecular dynamics (Car-Parrinello method) shows that large electric fields present at the tube tips are not the critical factor responsible for the open-ended growth observed experimentally. Classical molecular-dynamics simulations using realistic many-body carbon-carbon potentials show that wide tubes that are initially open can continue to grow straight and maintain an all-hexagonal structure. However, tubes narrower than a critical diameter, estimated to be about ?3 nm, readily nucleate curved, pentagonal structures that lead to tube closure with further addition of atoms. Very narrow tubes can be grown, however, if a small metal particle prevents tube closure. This effect was simulated explicitly by kinetic Monte Carlo methods. Monte Carlo simulations were also used to study nanotube growth over longer time scales. The resulting structures are in agreement with the above growth scenario, and provide an estimate for the lowest tube tip temperature necessary for the growth of nanotubes.

A. Maiti; C. J. Brabec; C. Roland; J. Bernholc

1995-11-15T23:59:59.000Z

252

Symmetry Properties of Single-Walled BC2N Nanotubes  

SciTech Connect (OSTI)

The symmetry properties of the single-walled BC2N nanotubes were investigated. All the BC2N nanotubes possess nonsymmorphic line groups. In contrast with the carbon and boron nitride nanotubes, armchair and zigzag BC2N nanotubes belong to different line groups, depending on the index n (even or odd) and the vector chosen. The number of Raman- active phonon modes is almost twice that of the infrared-active phonon modes for all kinds of BC2N nanotubes.

Pan, Hui [ORNL; Feng, Yuan Ping [National University of Singapore; Lin, Jainyi [Institute of Chemical and Engineering, Singapore

2009-06-01T23:59:59.000Z

253

Microwave-induced synthesis of ?-cyclodextrin/N-doped carbon nanotube polyurethane nanocomposites for water purification  

Science Journals Connector (OSTI)

Abstract The fabrication of polymer nanocomposites for the removal of organic species in aqueous media is achieved using conventional methods. However, these methods are expensive and deteriorating to the environment due to high energy demands and high organic solvent volume requirements. This work discusses the synthesis of nanocomposite polymers of ?-cyclodextrin (?-CD) and nitrogen-doped carbon nanotubes (N-CNTs) under microwave irradiation for the first time. This novel method is efficient, greener and time saving. Typically, the reaction to prepare ?-CD polymers takes about 24 h. Here we report a novel method to synthesize the polymers in 10 min. N-CNTs were synthesized via chemical vapour deposition method (CVD) using a 10 wt% Fe–Co/CaCO3 catalyst. The N-CNTs were found to contain ?2 at% nitrogen by CN analysis. The N-CNTs were of high purity and were oxidized with acid functional groups (–COOH, –CO, –OH) using nitric acid under reflux. Zeta potential studies indicated that the quantity of acid functional groups increases with increase in acid treatment times. The functionalised N-CNTs (fN-CNTs) were then polymerized with ?-CD using hexamethylene diisocyanate as the functional cross-linker in a microwave under an inert gas atmosphere. The polymers showed an efficient removal of p-nitrophenol from spiked water samples as confirmed by UV–Vis spectroscopy.

Sello P. Masinga; Edward N. Nxumalo; Bhekie B. Mamba; Sabelo D. Mhlanga

2014-01-01T23:59:59.000Z

254

CARBON NANOTUBES: PROPERTIES AND APPLICATIONS  

SciTech Connect (OSTI)

Carbon nanotubes were discovered in 1991 as a minority byproduct of fullerene synthesis. Remarkable progress has been made in the ensuing years, including the discovery of two basic types of nanotubes (single-wall and multi-wall), great strides in synthesis and purification, elucidation of many fundamental physical properties, and important steps towards practical applications. Both the underlying science and technological potential of SWNT can profitably be studied at the scale of individual tubes and on macroscopic assemblies such as fibers. Experiments on single tubes directly reveal many of the predicted quantum confinement and mechanical properties. Semiconductor nanowires have many features in common with nanotubes, and many of the same fundamental and practical issues are in play – quantum confinement and its effect on properties; possible device structures and circuit architectures; thermal management; optimal synthesis, defect morphology and control, etc. In 2000 we began a small effort in this direction, conducted entirely by undergraduates with minimal consumables support from this grant. With DOE-BES approval, this grew into a project in parallel with the carbon nanotube work, in which we studied of inorganic semiconductor nanowire growth, characterization and novel strategies for electronic and electromechanical device fabrication. From the beginnings of research on carbon nanotubes, one of the major applications envisioned was hydrogen storage for fuel-cell powered cars and trucks. Subsequent theoretical models gave mixed results, the most pessimistic indicating that the fundamental H2-SWNT interaction was similar to flat graphite (physisorption) with only modest binding energies implying cryogenic operation at best. New material families with encouraging measured properties have emerged, and materials modeling has gained enormously in predictive power, sophistication, and the ability to treat a realistically representative number of atoms. One of the new materials, highly porous carbide-derived carbons (CDC), is the subject of an add-on to this grant awarded to myself and Taner Yildirim (NIST). Results from the add-on led eventually to a new 3-year award DE-FG02-08ER46522 “From Fundamental Understanding to Predicting New Nanomaterials for High Capacity Hydrogen Storage”, $1000K, (05/31/2008 - 05/01/2011) with Taner Yildirim and myself as co-PI’s.

Fischer, John, E.

2009-07-24T23:59:59.000Z

255

Bulk Heterojunction Polymer Solar Cells  

Science Journals Connector (OSTI)

Recent developments on bulk-heterojunction polymer photovoltaic diodes will be presented, focusing on the mechanism of charge generation, low bandgap polymers for increased photon...

Janssen, René

256

Radioluminescent polymer lights  

SciTech Connect (OSTI)

The preparation of radioluminescent light sources where the tritium is located on the aryl-ring in a polymer has been demonstrated with deuterium/tritium substitution. This report discusses tests, results, and future applications of radioluminescent polymers. 10 refs. (FI)

Jensen, G.A.; Nelson, D.A.; Molton, P.M.

1990-09-01T23:59:59.000Z

257

Fabrication of carbon microcapsules containing silicon nanoparticles-carbon nanotubes nanocomposite by sol-gel method for anode in lithium ion battery  

SciTech Connect (OSTI)

Carbon microcapsules containing silicon nanoparticles (Si NPs)-carbon nanotubes (CNTs) nanocomposite (Si-CNT-C) have been fabricated by a surfactant mediated sol-gel method followed by a carbonization process. Silicon nanoparticles-carbon nanotubes (Si-CNT) nanohybrids were produced by a wet-type beadsmill method. To obtain Si-CNT nanocomposites with spherical morphologies, a silica precursor (tetraethylorthosilicate, TEOS) and polymer (PMMA) mixture was employed as a structure-directing medium. Thus the Si-CNT/Silica-Polymer microspheres were prepared by an acid catalyzed sol-gel method. Then a carbon precursor such as polypyrrole (PPy) was incorporated onto the surfaces of pre-existing Si-CNT/silica-polymer to generate Si-CNT/Silica-Polymer-PPy microspheres. Subsequent thermal treatment of the precursor followed by wet etching of silica produced Si-CNT-C microcapsules. The intermediate silica/polymer must disappear during the carbonization and etching process resulting in the formation of an internal free space. The carbon precursor polymer should transform to carbon shell to encapsulate remaining Si-CNT nanocomposites. Therefore, hollow carbon microcapsules containing Si-CNT nanocomposites could be obtained (Si-CNT-C). The successful fabrication was confirmed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). These final materials were employed for anode performance improvement in lithium ion battery. The cyclic performances of these Si-CNT-C microcapsules were measured with a lithium battery half cell tests. - Graphical Abstract: Carbon microcapsules containing silicon nanoparticles (Si NPs)-carbon nanotubes (CNTs) nanocomposite (Si-CNT-C) have been fabricated by a surfactant mediated sol-gel method. Highlights: > Polymeric microcapsules containing Si-CNT transformed to carbon microcapsules. > Accommodate volume changes of Si NPs during Li ion charge/discharge. > Sizes of microcapsules were controlled by experimental parameters. > Lithium storage capacity and coulombic efficiency were demonstrated. > Use of sol-gel procedure as intermediate reaction.

Bae, Joonwon, E-mail: joonwonbae@gmail.com [Samsung Advanced Institute of Technology, Yong-In City 446-712, Gyeong-Gi Province (Korea, Republic of)

2011-07-15T23:59:59.000Z

258

Properties of copper/graphite/carbon nanotubes composite reinforced by carbon nanotubes  

Science Journals Connector (OSTI)

Electroless Cu plating was used for flake G powder and CNTs, Cu–G–CNTs (copper/graphite/carbon nanotubes) composites were manufactured by means of powder...

Xin-Ying Liu; Xiong-Zhi Xiang; Fei Niu; Xiao-Jun Bai

2013-06-01T23:59:59.000Z

259

Quantifying the Solubility of Boron Nitride Nanotubes and Sheets with Static Light Scattering and Refractometry  

SciTech Connect (OSTI)

The dissolution of nanoparticles, particularly those containing boron, is an important area of interest for polymer nanocomposite formation and material development. In this work, the solubility of boron nitride nanotubes (BNNT), functionalized boron nitride nanotubes (FBNNT), and boron nitride sheets (BNZG) is quantified in toluene and THF with static light scattering, refractometry, UV vis spectroscopy, and physical observations. UV vis spectroscopy provides a method to determine the concentration and solubility limits of the solutions tested. Using light scattering, the second virial coefficient, A2, is determined and used to calculate , the solute solvent interaction parameter. The Hildebrand solubility parameter, , is then extracted from this data using the Hildebrand Scatchard Solution Theory. A list of potential good solvents based on the estimated value is provided for each nanoparticle. Single-walled carbon nanotubes (SWNTs) and prepolymers (EN4 and EN8) used to synthesize polyurethanes were also tested, because the published and molar attraction constants of these materials provided a selfconsistent check. The dn/dc of SWNTs and boron-containing particles was measured for the first time in this work. A solvent screen for BN-ZG provides additional information that supports the obtained and . Three systems were found to have values below 0.5 and were thermodynamically soluble: BNNT in THF, EN8 in THF, and EN8 in toluene.

Mutz, M [The University of Tennessee; Eastwood, Eric Allen [ORNL; Dadmun, Mark D [ORNL

2013-01-01T23:59:59.000Z

260

Structural stability of transparent conducting films assembled from length purified single-wall carbon nanotubes  

SciTech Connect (OSTI)

Single-wall carbon nanotube (SWCNT) films show significant promise for transparent electronics applications that demand mechanical flexibility, but durability remains an outstanding issue. In this work, thin membranes of length purified single-wall carbon nanotubes (SWCNTs) are uniaxially and isotropically compressed by depositing them on prestrained polymer substrates. Upon release of the strain, the topography, microstructure, and conductivity of the films are characterized using a combination of optical/fluorescence microscopy, light scattering, force microscopy, electron microscopy, and impedance spectroscopy. Above a critical surface mass density, films assembled from nanotubes of well-defined length exhibit a strongly nonlinear mechanical response. The measured strain dependence reveals a dramatic softening that occurs through an alignment of the SWCNTs normal to the direction of prestrain, which at small strains is also apparent as an anisotropic increase in sheet resistance along the same direction. At higher strains, the membrane conductivities increase due to a compression-induced restoration of conductive pathways. Our measurements reveal the fundamental mode of elasto-plastic deformation in these films and suggest how it might be suppressed.

J. M. Harris; G. R. S. Iyer; D. O. Simien; J. A. Fagan; J. Y. Huh; J. Y. Chung; S. D. Hudson; J. Obrzut; J. F. Douglas; C. M. Stafford; E. K. Hobbie

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

GLASSY STATES OF ADSORBED FLEXIBLE POLYMERS AND SPREAD POLYMER "MONOLAYERS"  

E-Print Network [OSTI]

1269 GLASSY STATES OF ADSORBED FLEXIBLE POLYMERS AND SPREAD POLYMER "MONOLAYERS" K. KREMER* Exxon mechanism for the dynamics of irreversibly adsorbed polymers. We argue that glass-like states can exist near of polymer adsorbed ' ' and the thickness of the adsorbed layer 2-7. While the results of the different

Paris-Sud XI, Université de

262

Collective resonances in carbon nanotubes  

Science Journals Connector (OSTI)

A theory is presented to study the plasma oscillations of the full ?+? electron system of carbon nanotubes. Cylindrical charge density was supposed to represent the electron distribution within the shells of the tubule and an integral equation is derived for the perturbation caused by an external electric field. From the solution of this equation the dynamical dipole polarizability is calculated in the energy range above 10 eV. For single-shell nanotubes a double-peaked spectrum resulted resembling the slow tangential and the fast radial dipole active mode of a classical spherical shell of finite width. The peak positions are around 17 and 22 eV for the smallest tubule radius and with increasing radius the low-energy peak shifts to a lower energy, the high-energy peak to a higher energy. For multishell nanotubes a strong shell-shell interaction is found, as a result of which the double-peaked structure of the innermost shell will be the dominant part in the imaginary part of the polarizability. With increasing shell number the low-energy peak shifts to a higher energy, the high-energy peak to lower energy; this is just the opposite tendency found in the radius dependence. For a large enough shell number the two peaks coincide at about 19 eV, and this value is independent of the radius of the innermost shell. Although the numbers mentioned may vary within 3–4 eV depending on the parameters of our models, the tendencies are in overall agreement with the existing electron energy loss spectroscopy measurements and with other theoretical predictions.

B. Vasvári

1997-03-15T23:59:59.000Z

263

Scaling of the conductance in gold nanotubes  

Science Journals Connector (OSTI)

A new form of gold nanobridges has been recently observed in ultrahigh-vacuum experiments, where gold atoms rearrange to build helical nanotubes, akin in some respects to carbon nanotubes. The good reproducibility of these wires and their unexpected stability allow for conductance measurements and make them promising candidates for future applications. We present here a study of the transport properties of these nanotubes in order to understand the role of chirality and of the different orbitals in quantum transport observables. The conductance per atomic row shows a light decreasing trend as the diameter grows, which is also shown through an analytical formula based on a one-orbital model.

Miriam del Valle; Carlos Tejedor; Gianaurelio Cuniberti

2006-07-10T23:59:59.000Z

264

Methods for producing reinforced carbon nanotubes  

DOE Patents [OSTI]

Methods for producing reinforced carbon nanotubes having a plurality of microparticulate carbide or oxide materials formed substantially on the surface of such reinforced carbon nanotubes composite materials are disclosed. In particular, the present invention provides reinforced carbon nanotubes (CNTs) having a plurality of boron carbide nanolumps formed substantially on a surface of the reinforced CNTs that provide a reinforcing effect on CNTs, enabling their use as effective reinforcing fillers for matrix materials to give high-strength composites. The present invention also provides methods for producing such carbide reinforced CNTs.

Ren, Zhifen (Newton, MA); Wen, Jian Guo (Newton, MA); Lao, Jing Y. (Chestnut Hill, MA); Li, Wenzhi (Brookline, MA)

2008-10-28T23:59:59.000Z

265

Hydrogenation of single-walled carbon nanotubes  

E-Print Network [OSTI]

Towards the development of a useful mechanism for hydrogen storage, we have studied the hydrogenation of single-walled carbon nanotubes with atomic hydrogen using core-level photoelectron spectroscopy and x-ray absorption spectroscopy. We find that atomic hydrogen creates C-H bonds with the carbon atoms in the nanotube walls and such C-H bonds can be com-pletely broken by heating to 600 oC. We demonstrate approximately 65+/-15 at % hydrogenation of carbon atoms in the single-walled carbon nanotubes which is equivalent to 5.1+/-1.2 weight % hydrogen capacity. We also show that the hydrogenation is a reversible process.

Anton Nikitin; Hirohito Ogasawara; David Mann; Reinhard Denecke; Zhiyong Zhang; Hongjie Dai; KJ Cho; Anders Nilsson

2005-10-14T23:59:59.000Z

266

Growth model for carbon nanotubes  

Science Journals Connector (OSTI)

Evidence is presented, through high-resolution electron microscopy images, for the open-end growth of carbon nanotubes. Terminations of incomplete layers of carbon, seen on the tube surfaces and cone tips, suggest that the extension and thickening of the tubes occur by the island growth of graphite basal planes on existing tube surfaces. The nucleation of positive (pentagons) and negative (heptagons) disclinations on open tube ends results in changes of growth directions, producing different morphologies. A novel structure that shows complete ‘‘turn around growth,’’ involving pentagon-heptagon pairs, of the tubular assemblies is presented.

Sumio Iijima; P. M. Ajayan; T. Ichihashi

1992-11-23T23:59:59.000Z

267

Quantum Entanglement in Carbon Nanotubes  

Science Journals Connector (OSTI)

With the surge of research in quantum information, the issue of producing entangled states has gained prominence. Here, we show that judiciously bringing together two systems of strongly interacting electrons with vastly differing ground states—the gapped BCS superconductor and the Luttinger liquid—can result in quantum entanglement. We propose three sets of measurements involving single-walled metallic carbon nanotubes which have been shown to exhibit Luttinger liquid physics, to test our claim and as nanoscience experiments of interest in and of themselves.

Cristina Bena; Smitha Vishveshwara; Leon Balents; Matthew P. A. Fisher

2002-06-26T23:59:59.000Z

268

Growth Energetics of Carbon Nanotubes  

Science Journals Connector (OSTI)

The growth energetics of carbon nanotubes during arc discharge conditions are investigated. Ab initio molecular dynamics calcualtions show that the electric field alone cannot stabilize the growth of open metallic tubes. The addition of atoms and small clusters to tubes were studied using realistic atomic potentials. Deposition on tubes narrower than Ĺ3 nm leads to nucleation of curved defects (adjacent pentagon pairs) and eventual tube closure, while deposition on wider tubes favors the formation of hexagons and isolated pentagons, thereby promoting open-ended growth.

A. Maiti; C. J. Brabec; C. M. Roland; J. Bernholc

1994-10-31T23:59:59.000Z

269

Tunable Adsorption on Carbon Nanotubes  

Science Journals Connector (OSTI)

We investigated the adsorption of a single atom, hydrogen and aluminum, on single-wall carbon nanotubes from first principles. The adsorption is exothermic, and the associated binding energy varies inversely as the radius of the zigzag tube. We found that the adsorption of a single atom and related properties can be modified continuously and reversibly by the external radial deformation. The binding energy on the high curvature site of the deformed tube increases with increasing radial deformation. The effects of curvature and radial deformation depend on the chirality of the tube.

O. Gülseren; T. Yildirim; S. Ciraci

2001-08-24T23:59:59.000Z

270

Nematic Anchoring on Carbon Nanotubes  

E-Print Network [OSTI]

A dilute suspension of carbon nanotubes (CNTs) in a nematic liquid crystal (LC) does not disturb the LC director. Due to a strong LC-CNT anchoring energy and structural symmetry matching, CNT long axis follows the director field, possessing enhanced dielectric anisotropy. This strong anchoring energy stabilizes local pseudo-nematic domains, resulting in non-zero dielectric anisotropy in the isotropic phase. These anisotropic domains respond to external electric fields and show intrinsic frequency response. The presence of these domains makes the isotropic phase field-responsive, giving rise to a large dielectric hysteresis effect.

Rajratan Basu; Germano S. Iannacchione

2009-09-28T23:59:59.000Z

271

Carbon Nanotubes in an Optical Trap  

Science Journals Connector (OSTI)

Study of carbon nanotubes (CNTs) in a single beam optical trap (1064 nm) was done. In the optical trap, repulsion of the CNTS from the laser radiation, bubble formation, broad band...

Ramanandan, Gopika; Dharmadhikari, Aditya K; Ramachandran, Hema; Dharmadhikari, Jayasree A; Mathur, Deepak

272

BX CY NZ nanotubes and nanoparticles  

DOE Patents [OSTI]

The invention provides crystalline nanoscale particles and tubes made from a variety of stoichiometries of B.sub.x C.sub.y N.sub.z where x, y, and z indicate a relative amount of each element compared to the others and where no more than one of x, y, or z are zero for a single stoichiometry. The nanotubes and nanoparticles are useful as miniature electronic components, such as wires, coils, schotky barriers, diodes, etc. The nanotubes and nanoparticles are also useful as coating that will protect an item from detection by electromagnetic monitoring techniques like radar. The nanotubes and nanoparticles are additionally useful for their mechanical properties, being comparable in strength and stiffness to the best graphite fibers or carbon nanotubes. The inventive nanoparticles are useful in lubricants and composites.

Cohen, Marvin Lou (Piedmont, CA); Zettl, Alexander Karlwalter (Kensington, CA)

2001-01-01T23:59:59.000Z

273

Separation of carbon nanotubes in density gradients  

DOE Patents [OSTI]

The separation of single-walled carbon nanotubes (SWNTs), by chirality and/or diameter, using centrifugation of compositions of SWNTs in and surface active components in density gradient media.

Hersam, Mark C. (Evanston, IL); Stupp, Samuel I. (Chicago, IL); Arnold, Michael S. (Northbrook, IL)

2012-02-07T23:59:59.000Z

274

Separation of carbon nanotubes in density gradients  

DOE Patents [OSTI]

The separation of single-walled carbon nanotubes (SWNTs), by chirality and/or diameter, using centrifugation of compositions of SWNTs in and surface active components in density gradient media.

Hersam, Mark C. (Evanston, IL); Stupp, Samuel I. (Chicago, IL); Arnold, Michael S. (Northbrook, IL)

2010-02-16T23:59:59.000Z

275

Continuous Growth of Vertically Aligned Carbon Nanotubes  

E-Print Network [OSTI]

Vertically aligned carbon nanotubes (VACNTs), sometimes called forests or carpets, are a promising material due to their unique physical and scale-dependent physical properties [1-3]. Continuous production of VACNTs is ...

Guzman de Villoria, R.

276

Transplanting assembly of individual carbon nanotubes  

E-Print Network [OSTI]

Handling and assembling individual nanostructures to bigger scale systems such as MEMS have been the biggest challenge. A deterministic assembly of individual carbon nanotubes by transplanting them to MEMS structures is ...

Kim, Soohyung

2009-01-01T23:59:59.000Z

277

Ultrafast Nonlinear Spectroscopy of Semiconducting Carbon Nanotubes  

E-Print Network [OSTI]

Bond, et al. , Nano Lett. 6, 1603 (2006). [18] H. Htoon, M.P. Nano Lett. 2006, 6, 1603. [14] Htoon, H. ; O’Connell, M.nanotubes. Nano Lett. , 6(8):1603–1608, 2006. [21] M.S.

Graham, Matthew Werden

2010-01-01T23:59:59.000Z

278

Functionalization and applications of carbon nanotubes  

E-Print Network [OSTI]

Carbon nanotubes (CNTs) possess a unique set of electrical and mechanical properties and have been used in a variety of applications. In this thesis, we explore strategies to functionalize CNTs as well as applications which ...

Schnorr, Jan M. (Jan Markus)

2012-01-01T23:59:59.000Z

279

Nanolithographic control of carbon nanotube synthesis  

E-Print Network [OSTI]

A method offering precise control over the synthesis conditions to obtain carbon nanotube (CNT) samples of a single chirality (metallic or semi-conducting) is presented. Using this nanolithographic method of catalyst deposition, the location of CNT...

Huitink, David Ryan

2009-05-15T23:59:59.000Z

280

Carbon nanotube synthesis for integrated circuit interconnects  

E-Print Network [OSTI]

Based on their properties, carbon nanotubes (CNTs) have been identified as ideal replacements for copper interconnects in integrated circuits given their higher current density, inertness, and higher resistance to ...

Nessim, Gilbert Daniel

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

Fabrication of microscale carbon nanotube fibers  

Science Journals Connector (OSTI)

Carbon nanotubes (CNTs) have excellent mechanical, chemical, and electronic properties, but realizing these excellences in practical applications needs to assemble individual CNTs into larger-scale products. Recently, CNT fibers demonstrate the potential ...

Gengzhi Sun; Yani Zhang; Lianxi Zheng

2012-01-01T23:59:59.000Z

282

Vibration, buckling and impact of carbon nanotubes.  

E-Print Network [OSTI]

??Natural frequencies of the double and triple-walled carbon nanotubes are determined exactly and approximately for both types. Approximate solutions are found by using Bubnov-Galerkin and… (more)

Pentaras, Demetris.

2009-01-01T23:59:59.000Z

283

Carbon nanotube bearings in theory and practice  

E-Print Network [OSTI]

Carbon Nanotubes (CNTs) are attractive elements for bearings in Micro-Electro-Mechanical Systems (MEMS), because their structure comprises nested shells with no bonding and sub-nanometer spacing between them, enabling ...

Cook, Eugene Hightower

2011-01-01T23:59:59.000Z

284

Carbon nanotube temperature and pressure sensors  

DOE Patents [OSTI]

The present invention, in one embodiment, provides a method of measuring pressure or temperature using a sensor including a sensor element composed of a plurality of carbon nanotubes. In one example, the resistance of the plurality of carbon nanotubes is measured in response to the application of temperature or pressure. The changes in resistance are then recorded and correlated to temperature or pressure. In one embodiment, the present invention provides for independent measurement of pressure or temperature using the sensors disclosed herein.

Ivanov, Ilia N; Geohegan, David Bruce

2013-10-29T23:59:59.000Z

285

Sulfonated polyphenylene polymers  

DOE Patents [OSTI]

Improved sulfonated polyphenylene compositions, improved polymer electrolyte membranes and nanocomposites formed there from for use in fuel cells are described herein. The improved compositions, membranes and nanocomposites formed there from overcome limitations of Nafion.RTM. membranes.

Cornelius, Christopher J. (Albuquerque, NM); Fujimoto, Cy H. (Albuquerque, NM); Hickner, Michael A. (Albuquerque, NM)

2007-11-27T23:59:59.000Z

286

Nanotube Fabrication byNanotube Fabrication by Anodic Aluminum Oxide,Anodic Aluminum Oxide,  

E-Print Network [OSTI]

Nanotube Fabrication byNanotube Fabrication by Anodic Aluminum Oxide,Anodic Aluminum Oxide, Self-regulating phenomena in materials science: Self-assembly of nanopores during anodic oxidation of aluminum (AAO) Self combined anodic aluminum oxide (AAO) nanostructures with atomic layer deposition (ALD) to fabricate

Rubloff, Gary W.

287

Synthesis and fluid interaction of ultra long carbon nanotubes  

E-Print Network [OSTI]

The successful integration for carbon nanotubes in future electronic applications relies on advances in their synthesis. In this work optimization of growth parameters was conducted to obtain ultra long carbon nanotubes. ...

Hofmann, Mario

2009-01-01T23:59:59.000Z

288

Boron-Nitride Nanotubes Show Potential in Cancer Treatment |...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Boron-Nitride Nanotubes Show Potential in Cancer Treatment NEWPORT NEWS, VA, April 26 - A new study has shown that adding boron-nitride nanotubes to the surface of cancer cells can...

289

First Principles Prediction of Nitrogen-doped Carbon Nanotubes...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

First Principles Prediction of Nitrogen-doped Carbon Nanotubes as a High-Performance Cathode for Li-S Batteries. First Principles Prediction of Nitrogen-doped Carbon Nanotubes as a...

290

Electrochemical Synthesis and Structural Characterization of Titania Nanotubes  

E-Print Network [OSTI]

Energy Dispersive X-ray Spectroscopy As-Grown Nanotubes EDSsurface energy, and other driving forces. As such, nanotubesenergy loss spectroscopy (EELS). Identification of the crystalline nature of the nanotubes

Nguyen, Que Anh

2010-01-01T23:59:59.000Z

291

HYDROGEN STORAGE IN CARBON NANOTUBES JOHN E. FISCHER  

E-Print Network [OSTI]

HYDROGEN STORAGE IN CARBON NANOTUBES JOHN E. FISCHER UNIVERSITY OF PENNSYLVANIA * SOME BASIC NOTIONS * BINDING SITES AND ENERGIES * PROCESSING TO ENHANCE CAPACITY: EX: ELECTROCHEMICAL Li INSERTION of Li+. AND: van der Waals interaction NANOTUBES CAPILLARITY: metals

292

A Generic Approach to Coat Carbon Nanotubes With Nanoparticles  

E-Print Network [OSTI]

A Generic Approach to Coat Carbon Nanotubes With Nanoparticles for Potential Energy Applications vari- ous nanoparticles onto multiwalled carbon nanotubes (CNTs). Charged and nonagglomerated aerosol unique hybrid nanostructures at- tractive for various energy applications. DOI: 10

Chen, Junhong

293

Analyzing manufacturing methods of carbon nanotubes for commercialization  

E-Print Network [OSTI]

This research explores the history and structure of carbon nanotubes and the current technologies and methods available for synthesizing, purifying, and assembling carbon nanotubes. Furthermore, the current state of ...

Dee, H. Devin (Herbert Devin)

2013-01-01T23:59:59.000Z

294

Energy Carrier Transport In Surface-Modified Carbon Nanotubes  

E-Print Network [OSTI]

of organic molecules or inorganic nanoparticles, debundling of nanotubes by dispersing agents, and microwave irradiation. Because carbon nanotubes have unique carrier transport characteristics along a sheet of graphite in a cylindrical shape, the properties...

Ryu, Yeontack

2012-11-30T23:59:59.000Z

295

Book review Carbon Nanotube Science: Synthesis, Properties and Appli-  

E-Print Network [OSTI]

Book review Carbon Nanotube Science: Synthesis, Properties and Appli- cations, Peter J.F. Harris, yet very broad coverage of such a variety of nanotube-related topics. As Peter Harris writes

Harris, Peter J F

296

Length dependence of the Raman spectra of carbon nanotubes  

E-Print Network [OSTI]

DNA-wrapping technology, combined with size-exclusion chromatography, have made possible the sorting of carbon nanotubes according to length. In particular, length sorted nanotube samples, with finite lengths approaching ...

Zare, Aurea Tucay

2009-01-01T23:59:59.000Z

297

A Continuum Model for Carbon Nanotube-Infused Polyimides  

E-Print Network [OSTI]

A Continuum Model for Carbon Nanotube-Infused Polyimides Heather Wilson1 , Sumanth Banda2 , Ralph C, the materials need to withstand this process. The nanotube-infused polyimides are flexible enough to withstand

298

NASA Partners License Nanotube Technology for Commercial Use...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

prnewswire.comnews-releasesnasa-partners-license-nanotube-technology-for-commercial-use-149724205.html Submitted: Monday, April 3...

299

Optimizing Carbon Nanotube Contacts for Use in Organic Photovoltaics: Preprint  

SciTech Connect (OSTI)

This report describes research on optimizing carbon nanotube networks for use as transparent electrical contacts (TCs) in organic photovoltaics (OPV).

Barnes, T. M.; Blackburn, J. L.; Tenent, R. C.; Morfa, A.; Heben, M.; Coutts, T. J.

2008-05-01T23:59:59.000Z

300

Structure and energetics of carbon nanotube ropes Zejian Liu a  

E-Print Network [OSTI]

materials. Single-walled carbon nanotubes, produced by the popular techniques such as electric arc-discharge

Qin, Lu-Chang

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

Biosensors Based on Functionalized Carbon Nanotubes, Nanoparticles, and Nanowires  

SciTech Connect (OSTI)

In this book chapter, we will review recent progress in functionalization of nanotubes, nanoparticles, and nanowires for sensing applications.

Wang, Jun; Liu, Guodong; Wu, Hong; Lin, Yuehe

2009-01-01T23:59:59.000Z

302

Synthčse de nanotubes de carbone monofeuillets individuels et composites modčles polymčres - nanotubes de carbone : application ŕ l'effet photovoltaďque.  

E-Print Network [OSTI]

??L'objectif de ce travail est d'élaborer des matériaux composites modčles nanotubes de carbone/polymčres permettant de tirer profit des propriétés des nanotubes de carbone ŕ l'échelle… (more)

Salem, Diana

2012-01-01T23:59:59.000Z

303

Nanotube Boiler 1 Abstract--Controlled copper evaporation at attogram  

E-Print Network [OSTI]

Nanotube Boiler 1 Abstract-- Controlled copper evaporation at attogram level from individual carbon nanotube (CNT) vessels, which we call nanotube boilers, is investigated experimentally, and ionization in these CNT boilers, which can serve as sources for mass transport and deposition in nanofluidic

Paris-Sud XI, Université de

304

ccsd00003793, Room temperature Peierls distortion in small diameter nanotubes  

E-Print Network [OSTI]

nanotubes D. Conn#19;etable, 1 G.-M. Rignanese, 2, 3 J.-C. Charlier, 2, 3 and X. Blase 1 1 Laboratoire de structure and electron-phonon coupling in small 4- #23; A diameter nanotubes. We show that both the C(5 the diameter decreases. These results question the origin of superconductivity in small diameter nanotubes

305

Method for synthesis of titanium dioxide nanotubes using ionic liquids  

SciTech Connect (OSTI)

The invention is directed to a method for producing titanium dioxide nanotubes, the method comprising anodizing titanium metal in contact with an electrolytic medium containing an ionic liquid. The invention is also directed to the resulting titanium dioxide nanotubes, as well as devices incorporating the nanotubes, such as photovoltaic devices, hydrogen generation devices, and hydrogen detection devices.

Qu, Jun; Luo, Huimin; Dai, Sheng

2013-11-19T23:59:59.000Z

306

Carbon Nanotubes for Thermoacoustic Contrast Enhancement Preliminary Results  

E-Print Network [OSTI]

Carbon Nanotubes for Thermoacoustic Contrast Enhancement ­ Preliminary Results Darrin Byrda., Milwaukee, WI 53211, USA ABSTRACT The unique electrical properties of Single-Walled Carbon Nanotubes make that nanotubes are capable of greatly increasing a material's absorption of electromagnetic radiation. We

Patch, Sarah

307

Nanoelectro-mechanical systems based on carbon nanotubes  

E-Print Network [OSTI]

:" , : Nanoelectro-mechanical systems based on carbon nanotubes ,81.90.88,81:39 ( -) 81:99 , ' ", '" #12;"Atomistic simulations of vibration of carbon nanotubes: is it possible to measure the mass of single atom?" Polina Pine Supervisor: Joan Adler, Yuval E. Yaish Carbon nanotubes

Adler, Joan

308

Evaluation of the Aquatic Ecotoxicology of Fullerenes and Nanotubes  

E-Print Network [OSTI]

Evaluation of the Aquatic Ecotoxicology of Fullerenes and Nanotubes of fullerenes and carbon nanotubes on aquatic organisms. The number of papers published on this topic is not very high and there are differences in the scientific quality. Fullerenes and carbon nanotubes appear

Fischlin, Andreas

309

Carbon nanotubes used to form fast, flexible circuitry  

E-Print Network [OSTI]

Carbon nanotubes used to form fast, flexible circuitry By Yun Xie | Published: July 23, 2008 - 12 the semiconductor portion of these flexible integrated circuits. Related Stories Carbon nanotubes as molecular scales Carbon nanotubes send electrons for a spin These conventional materials are serviceable

Rogers, John A.

310

Carbon nanotubes as photoacoustic molecular imaging agents in living mice  

E-Print Network [OSTI]

Carbon nanotubes as photoacoustic molecular imaging agents in living mice ADAM DE LA ZERDA1 not shown to target a diseased site in living subjects. Here we show that single-walled carbon nanotubes of tumours. Intravenous administration of these targeted nanotubes to mice bearing tumours showed eight times

Khuri-Yakub, Butrus T. "Pierre"

311

Absorption spectroscopy of individual single-walled carbon nanotubes  

E-Print Network [OSTI]

Absorption spectroscopy of individual single-walled carbon nanotubes Stéphane Berciaud,a Laurent-walled carbon nanotubes (SWNTs) lead to heterogeneous samples containing mixtures of metallic and semiconducting species with a variety of lengths and defects. Optical detection at the single nanotube level should thus

Boyer, Edmond

312

Electrochemical and Raman measurements on single-walled carbon nanotubes  

E-Print Network [OSTI]

Electrochemical and Raman measurements on single-walled carbon nanotubes M. Stoll a,*, P performed on a carbon nanotube mat as a working electrode using different salt solutions. The gravimetric capacitance of the nanotube material was estimated and its effective surface area was de- termined in a purely

Nabben, Reinhard

313

Manipulation and Imaging of Individual Single-Walled Carbon Nanotubes  

E-Print Network [OSTI]

Manipulation and Imaging of Individual Single-Walled Carbon Nanotubes with an Atomic Force Microscope** By Henk W. C. Postma, Allard Sellmeijer, and Cees Dekker* Carbon nanotubes[1] have attracted-walled nanotubes,[3±5] the prototype single-walled tubes are much more difficult to study since their diameter

314

Inorganic Nanotubes DOI: 10.1002/anie.200803447  

E-Print Network [OSTI]

Angewandte Chemie Inorganic Nanotubes DOI: 10.1002/anie.200803447 Core­Shell PbI2@WS2 Inorganic Nanotubes from Capillary Wetting** Ronen Kreizman, Sung You Hong, Jeremy Sloan, Ronit Popovitz-Biro, Ana cavity. Capillarity has been shown to drive the wetting and filling of multiwalled carbon nanotubes

Davis, Ben G.

315

Phonon Confinement Effects in Hybrid Virus-Inorganic Nanotubes for  

E-Print Network [OSTI]

Phonon Confinement Effects in Hybrid Virus-Inorganic Nanotubes for Nanoelectronic Applications as nanotemplates, viruses can actually improve the electron transport properties in semiconductor nanotubes grown nanotubes deposited on tobacco mosaic viruses, the confined acoustic phonons are found to be redistributed

Fonoberov, Vladimir

316

Carbon Nanotubes as Ultrahigh Quality Factor Mechanical Resonators  

E-Print Network [OSTI]

Carbon Nanotubes as Ultrahigh Quality Factor Mechanical Resonators Andreas K. Hu¨ttel, Gary A mode of suspended carbon nanotubes at millikelvin temperatures by measuring the single- electron tunneling current. The suspended nanotubes are actuated contact-free by the radio frequency electric field

317

THE ELECTRONIC PROPERTIES OF MULTI-WALLED CARBON NANOTUBES  

E-Print Network [OSTI]

THE ELECTRONIC PROPERTIES OF MULTI-WALLED CARBON NANOTUBES A Thesis Submitted to the Faculty I #12;rst started. I also thank Michael Buss for his insight and for making my #12;rst nanotube family for the many yawns and blank stares at the mention of the word nanotube. At least they listened

318

Carbon nanotubes adhesion and nanomechanical behavior from peeling force spectroscopy  

E-Print Network [OSTI]

Carbon nanotubes adhesion and nanomechanical behavior from peeling force spectroscopy Julien December 17, 2010 Abstract Applications based on Single Walled Carbon Nanotube (SWNT) are good example such as adhesion energy per unit length, curvature and bending rigidity of the nanotube. A complete picture

Boyer, Edmond

319

Repeat Space Theory Applied to Carbon Nanotubes and  

E-Print Network [OSTI]

1 Repeat Space Theory Applied to Carbon Nanotubes and Matrix Art Shigeru Arimoto* , Massoud Amini with the series of papers entitled "Repeat space theory applied to carbon nanotubes and related molecular networks formulated and discussed. The Matrix Art pictures of carbon nanotube energy band curves played a significant

Taylor, Keith F.

320

Direct Compressive Measurements of Individual Titanium Dioxide Nanotubes  

E-Print Network [OSTI]

Direct Compressive Measurements of Individual Titanium Dioxide Nanotubes Tolou Shokuhfar the syn- thesis of TiO2 nanotube arrays using an aqueous HF based electrolyte.5 The pH of F ion containing electrolytes was con- trolled to form nanotubes up to a few mi- crometers in length. They reported

Endres. William J.

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

Band structure and optical properties of isolated and bundled nanotubes  

E-Print Network [OSTI]

Band structure and optical properties of isolated and bundled nanotubes S. Reich , C. Thomsen , P of isolated and bundled single-walled nanotubes by ab initio calculations. Curvature effects on the electronic states depend on the chirality of the nanotube; the strongest deviations from the zone

Nabben, Reinhard

322

Simulations of nanosensors based on single walled carbon nanotubes  

E-Print Network [OSTI]

Simulations of nanosensors based on single walled carbon nanotubes Polina Pine1, Yuval E. Yaish2. The potential of single-walled carbon nanotubes as mass sensors is examined. The change in mass leads to proportional changes in the nanotube vibrational frequencies, which are monitored during atomistic simulations

Adler, Joan

323

Visualizing the Local Optical Response of Semiconducting Carbon Nanotubes to  

E-Print Network [OSTI]

Visualizing the Local Optical Response of Semiconducting Carbon Nanotubes to DNA-Wrapping Huihong ABSTRACT We studied the local optical response of semiconducting single-walled carbon nanotubes to wrapping-field images of single nanotubes reveal large DNA-wrapping-induced red shifts of the exciton energy

Novotny, Lukas

324

Stepwise Quenching of Exciton Fluorescence in Carbon Nanotubes  

E-Print Network [OSTI]

1 Stepwise Quenching of Exciton Fluorescence in Carbon Nanotubes by Single Molecule Reactions with individual single-walled carbon nanotubes are observed, and luminescence quenching analysis reveals the diffusional range of excitons in semiconducting nanotubes. *To whom correspondence should be addressed

Paris-Sud XI, Université de

325

Characterization of single wall carbon nanotubes by nonane preadsorption  

E-Print Network [OSTI]

energy for nitrogen adsorbed in nanotubes at zero coverage within the range of 12­18 kJ/mol. This bindingCharacterization of single wall carbon nanotubes by nonane preadsorption Oleg Byl a , Jie Liu b The preferential blocking of the interior adsorption sites of single walled carbon nanotubes (SWNTs) by n

Liu, Jie

326

UV-light enhanced oxidation of carbon nanotubes M. Grujicica,*  

E-Print Network [OSTI]

the activation energy for molecular-oxygen chemisorption to a nanotube, increases the adsorption energyUV-light enhanced oxidation of carbon nanotubes M. Grujicica,* , G. Caoa , A.M. Raob , T.M. Trittb) calculations of the interactions between selected semiconducting and metallic single-walled carbon nanotubes

Grujicic, Mica

327

Electrical Transport in Single-Wall Carbon Nanotubes  

E-Print Network [OSTI]

. (a) Schematic view a nanotube field-effect transistor (b) The Dirac energy dispersion coneElectrical Transport in Single-Wall Carbon Nanotubes Michael J. Biercuk1,3 , Shahal Ilani2 metal and semiconducting single-wall carbon nanotubes. The fundamental scattering mechanisms governing

McEuen, Paul L.

328

Raman Scattering in Carbon Nanotubes Christian Thomsen1  

E-Print Network [OSTI]

energy [4]. Theoretically, the electronic dispersion of nanotubes may be described by an- alyticRaman Scattering in Carbon Nanotubes Christian Thomsen1 and Stephanie Reich2 1 Institut f¨ur Festk of single-walled carbon nanotubes reflect the electron and phonon confinement as well as the cylindrical

Nabben, Reinhard

329

Molecular dynamics simulations of boronnitride nanotubes embedded in  

E-Print Network [OSTI]

, theoretical studies suggest that BN nanotubes exhibit an energy gap of about 4--5 eV independent of chiralityMolecular dynamics simulations of boron­nitride nanotubes embedded in amorphous Si­B­N Michael In this article, we examine the elastic properties of boron­nitride nanotubes, which are embedded in amorphous

Ferrari, Patrik L.

330

Measuring Point Defect Density in Individual Carbon Nanotubes Using  

E-Print Network [OSTI]

based on defec- tive nanotubes also show improved sensitivity.7 Recently, high-energy electron and ionMeasuring Point Defect Density in Individual Carbon Nanotubes Using Polarization-Dependent X in carbon nanotubes (CNTs) dramatically alter their physical, mechani- cal, and electronic properties.1

Hitchcock, Adam P.

331

Nanomechanical Energy Storage in Twisted Nanotube Ropes David Teich,1  

E-Print Network [OSTI]

Nanomechanical Energy Storage in Twisted Nanotube Ropes David Teich,1 Zacharias G. Fthenakis,2 2012) We determine the deformation energetics and energy density of twisted carbon nanotubes. The deformation energy of twisted nanotube ropes contains contributions associated not only with twisting but also

332

Experimental study of exiton binding energy in semiconducting carbon nanotubes  

E-Print Network [OSTI]

Experimental study of exiton binding energy in semiconducting carbon nanotubes Nicolas Izard,1, 2 to the exciton binding energy of nanotubes. Electroabsorption is a powerfull technique which directly probe dimensional nanotube leads to strong electron-hole localiza- tion, with binding energy as high as 0.5 e

Maruyama, Shigeo

333

Single-Walle 4. Single-Walled Carbon Nanotubes  

E-Print Network [OSTI]

applications, carbon nanotube research is ac- tively being pursued in diverse areas including energy storage105 Single-Walle 4. Single-Walled Carbon Nanotubes Sebastien Nanot, Nicholas A. Thompson, Ji Single-walled carbon nanotubes (SWCNTs) are hol- low, long cylinders with extremely large aspect ratios

Kono, Junichiro

334

Broadband Photodetector Based on Carbon Nanotube Fibers Simon Lee,1  

E-Print Network [OSTI]

UG-30 Broadband Photodetector Based on Carbon Nanotube Fibers Simon Lee,1 Xuan Wang absorption properties of the carbon nanotube fibers generate a thermal distribution across the length of applications of carbon nanotubes has been constantly expanding since its inception. From being a copper wire

335

Optical microcavity with semiconducting single-wall carbon nanotubes  

E-Print Network [OSTI]

Optical microcavity with semiconducting single- wall carbon nanotubes Etienne Gaufrès,1 Nicolas-Perot microcavities based on semiconducting single-wall carbon nanotubes with a quality factor of 160. We properties References and links 1. P. Avouris, M. Freitag and V. Perebeinos, "Carbon nanotube photonics

Paris-Sud XI, Université de

336

Carbon Nanotube Field-effect Transistors: AC Performance Capabilities.  

E-Print Network [OSTI]

Carbon Nanotube Field-effect Transistors: AC Performance Capabilities. D.L. Pulfrey, D.L. John-barrier carbon nanotube field-effect transistors are examined via simulations using a self-consistent Schrödinger is known about the DC capabilities of carbon nanotube field-effect transistors [1,2,3], and devices

Pulfrey, David L.

337

Why do nanotubes grow chiral?  

E-Print Network [OSTI]

Carbon nanotubes (CNT) hold enormous technological promise. It can only be harnessed if one controls in a practical way the CNT chirality, the feature of the tubular carbon topology that governs all the CNT properties---electronic, optical, mechanical. Experiments in catalytic growth over the last decade have repeatedly revealed a puzzling strong preference towards minimally-chiral (near-armchair) CNT, challenging any existing hypotheses and turning chirality control ever more tantalizing yet leaving its understanding elusive. Here we combine the CNT/catalyst interface thermodynamics with the kinetic growth theory to show that the unusual near-armchair peaks emerge from the two antagonistic trends: energetic preference towards achiral CNT/catalyst interfaces vs. faster growth of chiral CNT. This narrow distribution is profoundly related with the peaked behavior of a simple function, x*exp(-x).

Artyukhov, Vasilii I; Yakobson, Boris I

2014-01-01T23:59:59.000Z

338

Infrared spectra of individual semiconducting single-walled carbon nanotubes: Testing the scaling of transition energies for large diameter nanotubes  

E-Print Network [OSTI]

of transition energies for large diameter nanotubes Matthew Y. Sfeir and James A. Misewich* Condensed Matter on the same individual nanotube over an energy range of 0.3­2.7 eV. We find that well-established energy scaling relations developed for nanotubes of smaller diameter are not consistent with the measured low-energy

Heinz, Tony F.

339

Stimulation of osteogenic and angiogenic ability of cells on polymers by pulsed laser deposition of uniform akermanite-glass nanolayer  

Science Journals Connector (OSTI)

Abstract Polymer biomaterials have been widely used for bone replacement/regeneration because of their unique mechanical properties and workability. Their inherent low bioactivity makes them lack osseointegration with host bone tissue. For this reason, bioactive inorganic particles have been always incorporated into the matrix of polymers to improve their bioactivity. However, mixing inorganic particles with polymers always results in inhomogeneity of particle distribution in polymer matrix with limited bioactivity. This study sets out to apply the pulsed laser deposition (PLD) technique to prepare uniform akermanite (Ca2MgSi2O7, AKT) glass nanocoatings on the surface of two polymers (non-degradable polysulfone (PSU) and degradable polylactic acid (PDLLA)) in order to improve their surface osteogenic and angiogenic activity. The results show that a uniform nanolayer composed of amorphous AKT particles (?30 nm) of thickness 130 nm forms on the surface of both PSU and PDLLA films with the PLD technique. The prepared AKT-PSU and AKT-PDLLA films significantly improved the surface roughness, hydrophilicity, hardness and apatite mineralization, compared with pure PSU and PDLLA, respectively. The prepared AKT nanocoatings distinctively enhance the alkaline phosphate (ALP) activity and bone-related gene expression (ALP, OCN, OPN and Col I) of bone-forming cells on both PSU and PDLLA films. Furthermore, AKT nanocoatings on two polymers improve the attachment, proliferation, VEGF secretion and expression of proangiogenic factors and their receptors of human umbilical vein endothelial cells (HUVEC). The results suggest that PLD-prepared bioceramic nanocoatings are very useful for enhancing the physicochemical, osteogenic and angiogenic properties of both degradable and non-degradable polymers for application in bone replacement/regeneration.

Chengtie Wu; Dong Zhai; Hongshi Ma; Xiaomin Li; Yali Zhang; Yinghong Zhou; Yongxiang Luo; Yueyue Wang; Yin Xiao; Jiang Chang

2014-01-01T23:59:59.000Z

340

Growth Mechanisms of Vertically-aligned Carbon, Boron Nitride, and Zinc Oxide Nanotubes  

SciTech Connect (OSTI)

Nanotubes are one-dimensional nanomaterials with all atoms located near the surface. This article provides a brief review on the possible growth mechanisms of a series of inorganic nanotubes, in particular, vertically-aligned (VA) carbon nanotubes (CNTs), boron nitride nanotubes (BNNTs), and ZnO nanotubes (ZnO NTs).

Yap, Yoke Khin [Department of Physics, Michigan Technological University, 118 Fisher Hall, 1400 Townsend Drive, Houghton, MI 49931 (United States)

2009-07-07T23:59:59.000Z

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

Robust Polymer Composite Membranes for Hydrogen Separation |...  

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

Robust Polymer Composite Membranes for Hydrogen Separation Robust Polymer Composite Membranes for Hydrogen Separation polymercompositemembranes.pdf More Documents & Publications...

342

1 - Fundamental optical properties of carbon nanotubes and graphene  

Science Journals Connector (OSTI)

Abstract: The fundamental electronic states and optical properties of single-walled carbon nanotubes are briefly explained in this chapter. Moreover, the novel optical properties of carbon nanotubes revealed by advanced laser spectroscopy (single-nanotube spectroscopy and time-resolved spectroscopy) are introduced. Due to the enhanced Coulomb interaction, the optically generated electron-hole pair forms a strongly bound ‘exciton’ state, analogous to the hydrogen-like state in the carbon nanotubes. The striking features of excitons in the carbon nanotube, such as singlet-dark states and triplet states, which dominate the optical properties, are described in this chapter.

K. Matsuda

2013-01-01T23:59:59.000Z

343

Pitch of a polymer cholesteric  

Science Journals Connector (OSTI)

Pitch of a polymer cholesteric ... We report measurements of the cholesteric pitch and twist elastic constant (K22) in monodisperse suspensions of the rodlike virus filamentous bacteriophage fd. ... Cholesteric Pitch of Lyotropic Polymer Liquid Crystals ...

Theo. Odijk

1987-01-01T23:59:59.000Z

344

polymers | OpenEI  

Open Energy Info (EERE)

polymers polymers Dataset Summary Description These data files contain volume, mass, and hardness changes of elastomers and plastics representative exposed to gasoline containing various levels of ethanol. These materials are representative of those used in gasoline fuel storage and dispensing hardware. All values are compared to the original untreated condition. The data sets include results from specimens exposed directly to the fuel liquid and also a set of specimens exposed only to the fuel vapors. Source Mike Kass, Oak Ridge National Laboratory Date Released August 16th, 2012 (2 years ago) Date Updated August 16th, 2012 (2 years ago) Keywords compatibility elastomers ethanol gasoline plastics polymers Data application/vnd.openxmlformats-officedocument.spreadsheetml.sheet icon plastics_dma_results_san.xlsx (xlsx, 4.9 MiB)

345

Inorganic nanotubes and electro-fluidic devices fabricated therefrom  

DOE Patents [OSTI]

Nanofluidic devices incorporating inorganic nanotubes fluidly coupled to channels or nanopores for supplying a fluid containing chemical or bio-chemical species are described. In one aspect, two channels are fluidly interconnected with a nanotube. Electrodes on opposing sides of the nanotube establish electrical contact with the fluid therein. A bias current is passed between the electrodes through the fluid, and current changes are detected to ascertain the passage of select molecules, such as DNA, through the nanotube. In another aspect, a gate electrode is located proximal the nanotube between the two electrodes thus forming a nanofluidic transistor. The voltage applied to the gate controls the passage of ionic species through the nanotube selected as either or both ionic polarities. In either of these aspects the nanotube can be modified, or functionalized, to control the selectivity of detection or passage.

Yang, Peidong (Kensington, CA); Majumdar, Arunava (Orinda, CA); Fan, Rong (Pasadena, CA); Karnik, Rohit (Cambridge, MA)

2011-03-01T23:59:59.000Z

346

DSM INVESTS IN MEDICAL POLYMERS  

Science Journals Connector (OSTI)

DSM INVESTS IN MEDICAL POLYMERS ... AS PART OF ITS SHIFT toward the specialty materials business, DSM will acquire Polymer Technology Group (PTG), a privately held maker of biomedical polymers. ... DSM isn’t disclosing the purchase price other than to say it is about 10 times PTG’s annual earnings. ...

MELODY VOITH

2008-05-05T23:59:59.000Z

347

Extended Platinum Nanotubes as Fuel Cell Catalysts  

SciTech Connect (OSTI)

Energy consumption has relied principally on fossil fuels as an energy source; fuel cells, however, can provide a clean and sustainable alternative, an answer to the depletion and climate change concerns of fossil fuels. Within proton exchange membrane fuel cells, high catalyst cost and poor durability limit the commercial viability of the device. Recently, platinum nanotubes (PtNTs) were studied as durable, active catalysts, providing a platform to meet US Department of Energy vehicular activity targets.[1] Porous PtNTs were developed to increase nanotube surface area, improving mass activity for oxygen reduction without sacrificing durability.[2] Subsurface platinum was then replaced with palladium, forming platinum-coated palladium nanotubes.[3] By forming a core shell structure, platinum utilization was increased, reducing catalyst cost. Alternative substrates have also been examined, modifying platinum surface facets and increasing oxygen reduction specific activity. Through modification of the PtNT platform, catalyst limitations can be reduced, ensuring a commercially viable device.

Alia, S.; Pivovar, B. S.; Yan, Y.

2012-01-01T23:59:59.000Z

348

Third Sound in Superfluid 4He Films Adsorbed on Packed Multiwall Carbon Nanotubes  

E-Print Network [OSTI]

of gases adsorbed on carbon nanotubes,” Phys. Rev. B. , vol.and P. Avouris, Carbon Nanotubes: Syn- thesis, Structure,4 He films on carbon nanotubes,” J. Phys. : Conf. Ser. ,

Menachekanian, Emin

2014-01-01T23:59:59.000Z

349

Co-synthesis of LiFePO4 and Carbon Nanotubes  

E-Print Network [OSTI]

as low as 0.1% have been reported for nanotubes in epoxy. 8of LiFePO 4 and carbon nanotubes potentially bypassesthat multi-walled carbon nanotubes (MWCNTs, Figure 1) and

Wilcox, James; Doeff, Marca M.

2006-01-01T23:59:59.000Z

350

E-Print Network 3.0 - altered nanotube dimension Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

nanotube dimension Page: << < 1 2 3 4 5 > >> 1 Thermal conductivity of B-C-N and BN nanotubes C. W. Changa Summary: Thermal conductivity of B-C-N and BN nanotubes C. W. Changa...

351

Synthesis and Electronic Transport in Known Chirality Single Wall Carbon Nanotubes  

E-Print Network [OSTI]

Synthesis and Electronic Transport in Known Chirality Single Wall Carbon Nanotubes Bhupesh Chandra;ABSTRACT Synthesis and Electronic Transport in Known Chirality Single Wall Carbon Nanotubes Bhupesh Chandra Carbon nanotubes are intriguing new materials with extraordinary electrical properties originating from

Hone, James

352

Conductance-Controlled Point Functionalization of Single-Walled Carbon Nanotubes  

E-Print Network [OSTI]

of Single-Walled Carbon Nanotubes Brett R. Goldsmith, 1 Johnof Single-Walled Carbon Nanotubes Brett R. Goldsmith et al.single-walled carbon nanotubes (SWNTs) to fabricate single-

Collins, Philip G

2007-01-01T23:59:59.000Z

353

Ultrafast Mid-Infrared Intra-Excitonic Response of Individualized Single-Walled Carbon Nanotubes  

E-Print Network [OSTI]

Z. Ma et al. , in: Carbon Nanotubes, edited by A. Jorio, G.Single-Walled Carbon Nanotubes Jigang Wang, 1, 2 Matt W.7,5) single-walled carbon nanotubes. Strong photoinduced

Wang, Jigang

2011-01-01T23:59:59.000Z

354

First principles study of structure and lithium storage in inorganic nanotubes  

E-Print Network [OSTI]

The exact structure of layered inorganic nanotubes is difficult to determine, but this information is vital to using atomistic calculations to predict nanotube properties. A multi-walled nanotube with a circular cross ...

Tibbetts, Kevin (Kevin Joseph)

2009-01-01T23:59:59.000Z

355

Effect of Localized Oxygen Functionalization On the Conductance of Metallic Carbon Nanotubes  

E-Print Network [OSTI]

of metallic carbon nanotubes M. K. Ashraf, 1, * Nicolas A.and metallic zigzag carbon nanotubes ?CNTs? is presented. InI. INTRODUCTION Carbon nanotubes ?CNTs? are a candidate for

Collins, Philip G

2009-01-01T23:59:59.000Z

356

Four-Wave Mixing Microscopy with Electronic Contrast of Individual Carbon Nanotubes  

E-Print Network [OSTI]

and J. Jiang, in Carbon Nanotubes, edited by A. Jorio, G.V. Perebeinos, in Carbon Nanotubes, edited by A. Jorio, G.and P. Finnie, in Carbon Nanotubes, edited by A. Jorio, G.

Collins, Philip G

2012-01-01T23:59:59.000Z

357

Electrode Characteristics of Individual, MnO2 Coated Carbon Nanotubes  

E-Print Network [OSTI]

MnO2 Coated Carbon Nanotubes Brad L. Corso, Israel Perez,single- walled carbon nanotubes. Li ion cyclic voltammetrysingle-walled carbon nanotubes (SWNTs) that are grown in

Collins, Philip G

2011-01-01T23:59:59.000Z

358

images/logoetsf Introduction Electron Energy Loss Spectroscopy Applications: Nanotubes and Graphene Perspectives  

E-Print Network [OSTI]

images/logoetsf Introduction Electron Energy Loss Spectroscopy Applications: Nanotubes and Graphene excitations Francesco Sottile #12;Introduction Electron Energy Loss Spectroscopy Applications: Nanotubes excitations Francesco Sottile #12;Introduction Electron Energy Loss Spectroscopy Applications: Nanotubes

Botti, Silvana

359

The Surface Reactivities of Single-Walled Carbon Nanotubes and Their Related Toxicities  

E-Print Network [OSTI]

single-walled carbon nanotubes Energy (eV) C 2 C 1 S 11 S 22nanotubes (SWCNTs) have found applications in production of renewable energy,nanotubes (CNTs) are of paramount importance for the production of renewable energy

Ren, Lei

2012-01-01T23:59:59.000Z

360

Co-synthesis of LiFePO4 and Carbon Nanotubes  

E-Print Network [OSTI]

of LiFePO 4 and carbon nanotubes potentially bypassessynthesis of LiFePO 4 and Carbon Nanotubes James Wilcox* ,†that multi-walled carbon nanotubes (MWCNTs, Figure 1) and

Wilcox, James; Doeff, Marca M.

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

Bisphenol-A (BPA), BPA Glucuronide, and BPA Sulfate in Midgestation Umbilical Cord Serum in a Northern and Central California Population  

Science Journals Connector (OSTI)

Bisphenol-A (BPA), BPA Glucuronide, and BPA Sulfate in Midgestation Umbilical Cord Serum in a Northern and Central California Population ... Bisphenol-A (BPA) is an endocrine disrupting chemical used in numerous consumer products, resulting in universal exposure in the United States. ... Prenatal exposure to BPA is associated with numerous reproductive and developmental effects in animals. ...

Roy R. Gerona; Tracey J. Woodruff; Carrie A. Dickenson; Janet Pan; Jackie M. Schwartz; Saunak Sen; Matthew W. Friesen; Victor Y. Fujimoto; Patricia A. Hunt

2013-08-13T23:59:59.000Z

362

Improved synthesis of carbon nanotubes with junctions and of single-walled carbon nanotubes  

Science Journals Connector (OSTI)

Pyrolysis of thiophene over nickel nanoparticles dispersed on silica is shown to yield Y-junction carbon nanotubes with smaller diameters than those obtained by ... pyrolysis of organometallic-hydrocarbon mixture...

F. L. Deepak; A. Govindaraj; C. N. R. Rao

2006-01-01T23:59:59.000Z

363

Sedimentation of Knotted Polymers  

E-Print Network [OSTI]

We investigate the sedimentation of knotted polymers by means of stochastic rotation dynamics, a molecular dynamics algorithm that takes hydrodynamics fully into account. We show that the sedimentation coefficient s, related to the terminal velocity of the knotted polymers, increases linearly with the average crossing number n_c of the corresponding ideal knot. To the best of our knowledge, this provides the first direct computational confirmation of this relation, postulated on the basis of experiments in "The effect of ionic conditions on the conformations of supercoiled DNA. I. sedimentation analysis" by Rybenkov et al., for the case of sedimentation. Such a relation was previously shown to hold with simulations for knot electrophoresis. We also show that there is an accurate linear dependence of s on the inverse of the radius of gyration R_g^-1, more specifically with the inverse of the R_g component that is perpendicular to the direction along which the polymer sediments. When the polymer sediments in a slab, the walls affect the results appreciably. However, R_g^-1 remains to a good precision linearly dependent on n_c. Therefore, R_g^-1 is a good measure of a knot's complexity.

Joonas Piili; Davide Marenduzzo; Kimmo Kaski; Riku Linna

2012-12-20T23:59:59.000Z

364

Electrical device fabrication from nanotube formations  

DOE Patents [OSTI]

A method for forming nanotube electrical devices, arrays of nanotube electrical devices, and device structures and arrays of device structures formed by the methods. Various methods of the present invention allow creation of semiconducting and/or conducting devices from readily grown SWNT carpets rather than requiring the preparation of a patterned growth channel and takes advantage of the self-controlling nature of these carpet heights to ensure a known and controlled channel length for reliable electronic properties as compared to the prior methods.

Nicholas, Nolan Walker; Kittrell, W. Carter; Kim, Myung Jong; Schmidt, Howard K.

2013-03-12T23:59:59.000Z

365

Laser ablative synthesis of carbon nanotubes  

DOE Patents [OSTI]

An improved method for the production of single walled carbon nanotubes that utilizes an RF-induction heated side-pumped synthesis chamber for the production of such. Such a method, while capable of producing large volumes of carbon nanotubes, concurrently permits the use of a simplified apparatus that allows for greatly reduced heat up and cool down times and flexible flowpaths that can be readily modified for production efficiency optimization. The method of the present invention utilizes a free electron laser operating at high average and peak fluence to illuminate a rotating and translating graphite/catalyst target to obtain high yields of SWNTs without the use of a vacuum chamber.

Smith, Michael W. (Newport News, VA); Jordan, Kevin (Newport News, VA); Park, Cheol (Yorktown, VA)

2010-03-02T23:59:59.000Z

366

Nanoscale atomic waveguides with suspended carbon nanotubes  

E-Print Network [OSTI]

We propose an experimentally viable setup for the realization of one-dimensional ultracold atom gases in a nanoscale magnetic waveguide formed by single doubly-clamped suspended carbon nanotubes. We show that all common decoherence and atom loss mechanisms are small guaranteeing a stable operation of the trap. Since the extremely large current densities in carbon nanotubes are spatially homogeneous, our proposed architecture allows to overcome the problem of fragmentation of the atom cloud. Adding a second nanowire allows to create a double-well potential with a moderate tunneling barrier which is desired for tunneling and interference experiments with the advantage of tunneling distances being in the nanometer regime.

V. Peano; M. Thorwart; A. Kasper; R. Egger

2005-11-23T23:59:59.000Z

367

Magnetic Schrödinger operators on armchair nanotubes  

E-Print Network [OSTI]

We consider the Schr\\"odinger operator with a periodic potential on a quasi 1D continuous periodic model of armchair nanotubes in $\\R^3$ in a uniform magnetic field (with amplitude $B\\in \\R$), which is parallel to the axis of the nanotube. The spectrum of this operator consists of an absolutely continuous part (spectral bands separated by gaps) plus an infinite number of eigenvalues with infinite multiplicity. We describe all eigenfunctions with the same eigenvalue including compactly supported. We describe the spectrum as a function of $B$. For some specific potentials we prove an existence of gaps independent on the magnetic field. If $B\

Evgeny Korotyaev; Andrey Badanin

2008-04-01T23:59:59.000Z

368

Intersubband Edge Singularity in Metallic Nanotubes  

E-Print Network [OSTI]

Tunneling density of states of both the massless and massive (gapped) particles in metallic carbon nanotubes is known to have anomalous energy dependence. This is the result of coupling to multiple low-energy bosonic excitation (plasmons). For both kinds of particles the ensuing effect is the suppression of the density of states by electron-electron interactions. We demonstrate that the optical absorption between gapless and gapped states is affected by the many-body effects in the opposite way. The absorption probability is enhanced compared with the non-interacting value and develops a power-law frequency dependence with the exponent -0.2 for typical nanotubes.

E. G. Mishchenko; O. A. Starykh

2011-09-08T23:59:59.000Z

369

Neutron scattering studies of carbon nanotubes  

Science Journals Connector (OSTI)

We report on neutron scattering studies of single wall carbon nanotubes (SWNT). Small angle scattering was used to investigate the structure of SWNT suspensions. Diffraction data were compared to calculations on finite-size bundles of SWNT in order to estimate the distribution of tube diameters. Lastly we present an inelastic neutron scattering study of the density of phonon states in SWNT. In the frequency range of intramolecular modes the measured spectrum is found to be in good agreement with that calculated on an isolated (10 10) nanotube.

E. Anglaret; S. Rols; J. L. Sauvajol

1999-01-01T23:59:59.000Z

370

Gel polymer electrolytes for batteries  

DOE Patents [OSTI]

Nanostructured gel polymer electrolytes that have both high ionic conductivity and high mechanical strength are disclosed. The electrolytes have at least two domains--one domain contains an ionically-conductive gel polymer and the other domain contains a rigid polymer that provides structure for the electrolyte. The domains are formed by block copolymers. The first block provides a polymer matrix that may or may not be conductive on by itself, but that can soak up a liquid electrolyte, thereby making a gel. An exemplary nanostructured gel polymer electrolyte has an ionic conductivity of at least 1.times.10.sup.-4 S cm.sup.-1 at 25.degree. C.

Balsara, Nitash Pervez; Eitouni, Hany Basam; Gur, Ilan; Singh, Mohit; Hudson, William

2014-11-18T23:59:59.000Z

371

Vasoconstrictor effects of 8-iso-prostaglandin E2 and 8-iso-prostaglandin F2? on human umbilical vein  

Science Journals Connector (OSTI)

The present study was undertaken to determine whether 8-iso-prostaglandin E2 and 8-iso-prostaglandin F2? posses contractile action on human umbilical vein and to evaluate the possible involvement of prostanoid TP receptors in this effect. Human umbilical vein rings were mounted in organ baths and concentration–response curves to 8-iso-prostaglandin E2 or 8-iso-prostaglandin F2? were constructed. Both isoprostanes evoked concentration-dependent contraction. 8-iso-prostaglandin E2 (pEC50=6.90±0.03) was significantly more potent than 8-iso-prostaglandin F2? (pEC50=6.10±0.04). However, both isoprostanes were equieffective. The prostanoid TP receptor antagonists, ICI-192,605 (4-(Z)-6-(2-o-Chlorophenyl-4-o-hydroxyphenyl-1,3-dioxan-cis-5-yl)hexenoic acid) and SQ-29548 (7-[3-[[2-[(phenylamino)carbonyl]hydrazino]methyl]-7-oxabicyclo[2.2.1]hept-2-yl]-[1S(1?,2?(Z),3?,4?)]-5-Heptenoic acid) produced a competitive rightward shift of 8-iso-prostaglandin E2 concentration–response curves with pKB values of 8.91±0.04 and 8.07±0.07, respectively. When ICI-192,605 (1 nM) and SQ-29548 (10 nM) were evaluated against 8-iso-prostaglandin F2? they produced a parallel rightward displacement of 8-iso-prostaglandin F2? concentration–response curves without affecting the maximum responses giving pA2 values of 9.02±0.12 and 8.26±0.13, respectively. In conclusion, the present study describes for the first time the vasoconstrictor action of 8-iso-prostaglandin E2 and 8-iso-prostaglandin F2? in human umbilical vein. Furthermore, the affinity values obtained with ICI-192,605 and SQ-29548 provide strong pharmacological evidence of prostanoid TP receptors involvement in this effect.

Federico M. Daray; Ana I. Minvielle; Soledad Puppo; Rodolfo P. Rothlin

2004-01-01T23:59:59.000Z

372

E-Print Network 3.0 - armchair carbon nanotubes Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

carbon nanotubes Search Powered by Explorit Topic List Advanced Search Sample search results for: armchair carbon nanotubes Page: << < 1 2 3 4 5 > >> 1 Fluorescence spectroscopy of...

373

E-Print Network 3.0 - amyloid peptide nanotubes Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

peptide nanotubes Search Powered by Explorit Topic List Advanced Search Sample search results for: amyloid peptide nanotubes Page: << < 1 2 3 4 5 > >> 1 NATURE NANOTECHNOLOGY |...

374

Layer-By-Layer Assembled Hybrid Film of Carbon Nanotubes/Iron...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

By-Layer Assembled Hybrid Film of Carbon NanotubesIron Oxide Nanocrystals for Reagentless Electrochemical Detection of Layer-By-Layer Assembled Hybrid Film of Carbon Nanotubes...

375

Fabrication of high thermal conductivity arrays of carbon nanotubes and their composites  

DOE Patents [OSTI]

Methods and apparatus are described for fabrication of high thermal conductivity arrays of carbon nanotubes and their composites. A composition includes a vertically aligned nanotube array including a plurality of nanotubes characterized by a property across substantially all of the vertically aligned nanotube array. A method includes depositing a vertically aligned nanotube array that includes a plurality of nanotubes; and controlling a deposition rate of the vertically aligned nanotubes array as a function of an in situ monitored property of the plurality of nanotubes.

Geohegan, David B. (Knoxville, TN) [Knoxville, TN; Ivanov, Ilya N. (Knoxville, TN) [Knoxville, TN; Puretzky, Alexander A [Knoxville, TN

2010-07-27T23:59:59.000Z

376

Block copolymer-templated iron oxide nanoparticles for bimodal growth of multi-walled carbon nanotubes  

E-Print Network [OSTI]

Since their discovery carbon nanotubes (CNTs) have sparked great interest due to their exceptional mechanical, electrical, and thermal properties. These properties make carbon nanotubes desirable for numerous applications ...

Yazzie, Kyle E

2008-01-01T23:59:59.000Z

377

Effective models for excitons in carbon nanotubes  

E-Print Network [OSTI]

We analyse the low lying spectrum of a model of excitons in carbon nanotubes. Consider two particles with an attractive Coulomb self-interaction, placed on an infinitely long cylinder. If the cylinder radius becomes small, the low lying spectrum is well described by a one-dimensional effective Hamiltonian which is exactly solvable.

Horia D. Cornean; Pierre Duclos; Benjamin Ricaud

2006-05-04T23:59:59.000Z

378

Nanotube/Nanowire Based ORR Catalyst  

Broader source: Energy.gov [DOE]

Presentation about nanotube or nanowire-based oxygen reduction reaction (ORR) catalysts, presented by Yushan Yan, University of Delaware, at the kick-off meeting of the U.S. Department of Energy Fuel Cell Technologies Program's Catalysis Working Group, held May 14, 2012, in Arlington, Virginia.

379

Highly Ordered Carbon Nanotube Nematic Liquid Crystals  

Science Journals Connector (OSTI)

Nicolas Puech †, Christophe Blanc ‡, Eric Grelet †, Camilo Zamora-Ledezma §, Maryse Maugey †, Cécile Zakri †, Eric Anglaret ‡, and Philippe Poulin †* ... *E-mail: poulin@crpp-bordeaux.cnrs.fr. ... Vigolo, B.; Penicaud, A.; Coulon, C.; Sauder, C.; Pailler, R.; Journet, C.; Bernier, P.; Poulin, P.Macroscopic fibers and ribbons of oriented carbon nanotubes Science 2000, 290 ( 5495) 1331– 1334 ...

Nicolas Puech; Christophe Blanc; Eric Grelet; Camilo Zamora-Ledezma; Maryse Maugey; Ce?cile Zakri; Eric Anglaret; Philippe Poulin

2011-02-04T23:59:59.000Z

380

Lipid Bilayers Covalently Anchored to Carbon Nanotubes  

Science Journals Connector (OSTI)

Formvar coated-copper grids (TED Pella, Redding, CA) were placed on the sample droplets for 3–4 min, and the excess fluid was removed by filter paper. ... Polizu, S.; Savadogo, O.; Poulin, P.; Yahia, L.Applications of carbon nanotubes-based biomaterials in biomedical nanotechnology J. Nanosci. ...

Yasaman Dayani; Noah Malmstadt

2012-05-08T23:59:59.000Z

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

Hydrogen Evolution on Hydrophobic Aligned Carbon Nanotube  

E-Print Network [OSTI]

).3 From a fundamental standpoint, hydro- phobicity is governed by the surface micro- structure Institute of Technology, Pasadena, California 91125 C arbon nanotubes (CNTs) hydro- phobic and hydrophilic pressure on the stability of water droplets sitting on hydro- phobic vertically aligned CNT forests

Daraio, Chiara

382

A C70-carbon nanotube complex for bulk heterojunction photovoltaic cells  

SciTech Connect (OSTI)

A C70 fullerene-multi-walled carbon nanotube (C70-CNT) complex has been used as a component of the photoactive layer in a bulk heterojunction photovoltaic cell. As compared to a control device with only C70, the addition of CNTs led to improvements in short circuit current density (J{sub sc}), open circuit voltage (V{sub oc}), and power conversion efficiency by 31.8, 17.5, and 69.5%, respectively. This device takes advantage of both the electron accepting feature of C70 and the high electron transport capability of CNTs. These results indicate that C70 decorated CNT is a promising additive for performance enhancement of polymer photovoltaic cells.

Lau, Xinbo C.; Wang, Zhiqian; Mitra, Somenath, E-mail: Somenath.Mitra@njit.edu [Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102 (United States)] [Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102 (United States)

2013-12-09T23:59:59.000Z

383

Carbon nanotubes and carbon onions for modification of styrene-acrylate copolymer based nanocomposites  

SciTech Connect (OSTI)

Styrene acrylate polymer (SAC) nanocomposites with various carbon nanofillers (multiwalled carbon nanotubes MWCNTs and onion like carbon OLC) are manufactured by means of latex based routes. Concentration of the carbon nanofillers is changed in a broad interval starting from 0.01 up to 10 wt. %. Elastic, dielectric and electromagnetic properties of SAC nanocomposites are investigated. Elastic modulus, electrical conductivity and electromagnetic radiation absorption of the investigated SAC nanocomposites increase along with rising nanofiller content. The effect of the addition of anisometric MWCNTs on the elastic properties of the composite is higher than in the case of the addition of OLC. Higher electrical conductivity of the OLC containing nanocomposites is explained with the fact that reasonable agglomeration of the nanofiller can promote the development of electrically conductive network. Efficiency of the absorption of electromagnetic radiation depends on the development of conductive network within the SAC matrix.

Merijs-Meri, Remo; Zicans, Janis; Ivanova, Tatjana; Bitenieks, Juris [Institute of Polymer Materials, Riga Technical University, Azenes street 14/24, LV-1048, Riga (Latvia); Kuzhir, Polina; Maksimenko, Sergey [Institute of Nuclear Problems, Belarus State University, Bobruiskaya str. 11, 220030, Minsk (Belarus); Kuznetsov, Vladimir; Moseenkov, Sergey [Boreskov Institute of Catalyst Siberian branch of RAS, pr. Lavrentieva 5, 630090, Novosibirsk (Russian Federation)

2014-05-15T23:59:59.000Z

384

Diffusion through Carbon Nanotube Semipermeable membranes  

SciTech Connect (OSTI)

The goal of this project is to measure transport through CNTs and study effects of confinement at molecular scale. This work is motivated by several simulation papers in high profile journals that predict significantly higher transport rates of gases and liquids through carbon nanotubes as compared with similarly-sized nanomaterials (e.g. zeolites). The predictions are based on the effects of confinement, atomically smooth pore walls and high pore density. Our work will provide the first measurements that would compare to and hopefully validate the simulations. Gas flux is predicted to be >1000X greater for SWNTs versus zeolitesi. A high flux of 6-30 H2O/NT/ns {approx} 8-40 L/min for a 1cm{sup 2} membrane is also predicted. Neutron diffraction measurements indicate existence of a 1D water chain within a cylindrical ice sheet inside carbon nanotubes, which is consistent with the predictions of the simulation. The enabling experimental platform that we are developing is a semipermeable membrane made out of vertically aligned carbon nanotubes with gaps between nanotubes filled so that the transport occurs through the nanotubes. The major challenges of this project included: (1) Growth of CNTs in the suitable vertically aligned configuration, especially the single wall carbon nanotubes; (2) Development of a process for void-free filling gaps between CNTs; and (3) Design of the experiments that will probe the small amounts of analyte that go through. Knowledge of the behavior of water upon nanometer-scale confinement is key to understanding many biological processes. For example, the protein folding process is believed to involve water confined in a hydrophobic environment. In transmembrane proteins such as aquaporins, water transport occurs under similar conditions. And in fields as far removed as oil recovery and catalysis, an understanding of the nanoscale molecular transport occurring within the nanomaterials used (e.g. zeolites) is the key to process optimization. Furthermore, advancement of many emerging nanotechnologies in chemistry and biology will undoubtedly be aided by an understanding confined water transport, particularly the details of hydrogen bonding and solvation that become crucial on this length scale. We can envision several practical applications for our devices, including desalination, gas separations, dialysis, and semipermeable fabrics for protection against CW agents etc. The single wall carbon nanotube membranes will be the key platform for applications because they will allow high transport rates of small molecules such as water and eliminate solvated ions or CW agents.

Bakajin, O

2006-02-13T23:59:59.000Z

385

Lightweight polymer concrete composites  

SciTech Connect (OSTI)

Lightweight polymer concrete composites have been developed with excellent insulating properties. The composites consist of lightweight aggregates such as expanded perlites, multicellular glass nodules, or hollow alumina silicate microspheres bound together with unsaturated polyester or epoxy resins. These composites, known as Insulating Polymer Concrete (IPC), have thermal conductivites from 0.09 to 0.19 Btu/h-ft-/sup 0/F. Compressive strengths, dependent upon the aggregates used, range from 1000 to 6000 psi. These materials can be precast or cast-in-place on concrete substrates. Recently, it has been demonstrated that these materials can also be sprayed onto concrete and other substrates. An overlay application of IPC is currently under way as dike insulation at an LNG storage tank facility. The composites have numerous potentials in the construction industry such as insulating building blocks or prefabricated insulating wall panels.

Fontana, J.J.; Steinberg, M.; Reams, W.

1985-08-01T23:59:59.000Z

386

Elegant Way of Strengthening Polymer?Polymer Interface Using Nanoclay  

Science Journals Connector (OSTI)

Elegant Way of Strengthening Polymer?Polymer Interface Using Nanoclay ... In this group, montmorillonite (MMT) nanoclay has been employed in numerous polymer nanocomposite systems because it is environmentally friendly, readily available in large quantities, and its intercalation chemistry has been well studied in comparison with other nanoclays (18-20). ... The detection of this interesting behavior of nanoclays in BIMS rubber has prompted us to initiate a detailed investigation into the tackification mechanism of nanoclay in other general purpose elastomers also. ...

Ganesh C. Basak; K. Dinesh Kumar; Abhijit Bandyopadhyay; Anil K. Bhowmick

2010-10-12T23:59:59.000Z

387

Low band gap polymers Organic Photovoltaics  

E-Print Network [OSTI]

Low band gap polymers for Organic Photovoltaics Eva Bundgaard Ph.D. Dissertation Risø National Bundgaard Title: Low band gap polymers for Organic photovoltaics Department: The polymer department Report the area of organic photovoltaics are focusing on low band gap polymers, a type of polymer which absorbs

388

Polymer Crowding and Shape Distributions in Polymer-Nanoparticle Mixtures  

E-Print Network [OSTI]

Macromolecular crowding can influence polymer shapes, which is important for understanding the thermodynamic stability of polymer solutions and the structure and function of biopolymers (proteins, RNA, DNA) under confinement. We explore the influence of nanoparticle crowding on polymer shapes via Monte Carlo simulations and free-volume theory of a coarse-grained model of polymer-nanoparticle mixtures. Exploiting the geometry of random walks, we model polymer coils as effective penetrable ellipsoids, whose shapes fluctuate according to the probability distributions of the eigenvalues of the gyration tensor. Accounting for the entropic cost of a nanoparticle penetrating a larger polymer coil, we compute the crowding-induced shift in the shape distributions, radius of gyration, and asphericity of ideal polymers in a theta solvent. With increased nanoparticle crowding, we find that polymers become more compact (smaller, more spherical), in agreement with predictions of free-volume theory. Our approach can be easily extended to nonideal polymers in good solvents and used to model conformations of biopolymers in crowded environments.

Wei Kang Lim; Alan R. Denton

2014-10-24T23:59:59.000Z

389

Metal-Polymer Interactions in a Polymer/Metal Nanocomposite  

Science Journals Connector (OSTI)

A poly(t-butyl acrylate)/gold nanocomposite sandwich was annealed to induce diffusion of the gold particles, which was monitored using Rutherford backscattering spectrometry. Marker motion experiments were also performed to probe particle and polymer mobilities independently. The experiments revealed that particle mobility was decreased by 2 to 3 orders of magnitude compared with the predictions by Stokes-Einstein theory. Diffusion of polymer molecules through a gold particle layer is decreased by a much smaller extent. These results are attributed to bridging between particles arising from slow exchange kinetics of polymer segments at the polymer/metal interface.

Douglas H. Cole; Kenneth R. Shull; L. E. Rehn; P. Baldo

1997-06-30T23:59:59.000Z

390

Eu-doped Y2O3 nanosheets and nanotubes  

SciTech Connect (OSTI)

A hydrothermal method was used to synthesize Eu-doped Y2O3 nanosheets and nanotubes. High Resolution transmission electron microscopy (HRTEM) and synchrotron x-ray diffraction were used to characterize these nanomaterials. The nanosheets were obtained using a slightly lower pH value and they were partly crystalline and partly amorphous. Using a pH value of about 10, fully crystalline nanotubes were obtained. It is anticipated that nanosheets folded themselves to form stable nanotubes.

Sun, Hongtao [Texas Tech University, Lubbock; Chaudhari, Jharna [Texas Tech University, Lubbock; Kenik, Edward A [ORNL; Zhu, H [Texas Tech University, Lubbock; Ma, Y [Texas Tech University, Lubbock

2011-01-01T23:59:59.000Z

391

Polymer Thermodynamics and Chain Structure Polymers display some similarities and some differences with nano-aggregates.  

E-Print Network [OSTI]

for aggregates and by the late Paul Flory of Stanford for polymer coils. Since the spring constant of a polymer of a polymer coil is largely determined by entropy, an individual polymer coil displays an increasing spring an aggregate in nanomaterials and a polymer coil in Polymer Science. The mass-fractal or minimum dimension

Beaucage, Gregory

392

Noncatalytic synthesis of carbon nanotubes by chemical vapor deposition  

SciTech Connect (OSTI)

A new method is proposed to obtain uniform arrays of multiwall carbon nanotubes without catalysts. Nanotubes have been formed by carbon condensation from a hydrogen-methane gas mixture activated by a dc discharge. Structural and morphological investigations of the obtained material were performed by Raman spectroscopy, scanning and transmission electron microscopy, energy-dispersive X-ray analysis, and electron energy loss spectroscopy. It is shown that the obtained nanotubes contain no impurities that could act as catalysts. Based on these experimental data, it is concluded that the nanotube synthesis under study is noncatalytic. Possible mechanisms of this synthesis are considered.

Ismagilov, R. R., E-mail: ismagil@polly.phys.msu.ru; Shvets, P. V.; Kharin, A. Yu.; Obraztsov, A. N. [Moscow State University (Russian Federation)

2011-03-15T23:59:59.000Z

393

Helium 4 Dimer in Two Coaxial Adjacent Nanotubes  

Science Journals Connector (OSTI)

The ground state properties of the helium 4 dimer, within the geometry defined by two adjacent nanotubes with different radii and hard core walls,...

J. Brana; S. Kili?; L. Vranješ

2002-01-01T23:59:59.000Z

394

Exciton Dynamics in (6,5) Carbon Nanotubes  

Science Journals Connector (OSTI)

Relaxation dynamics in carbon nanotubes, measured by transient absorption spectroscopy, are shown to exhibit stretched exponential behavior. The power dependence of the zero time delay...

Swan, Anna; Walsh, A G; Schneck, J; Green, A A; Hersam, M; Ziegler, L D

395

Geometry and X-ray diffraction characteristics of carbon nanotubes  

SciTech Connect (OSTI)

Algorithms for generating atomic coordinates in nanotubes with an arbitrary cell in the layer plane have been developed. The conditions for the seamless matching of a flat layer rolled up in any direction are formulated for cylindrical, conical, and faceted tubes. A method has been developed for generating different types of faceted nanotubes using a group transformation (obtained in this study) that leaves invariant an arbitrary polygon in the nanotube cross section. Equations are proposed for deriving the diameter and chirality of single-wall carbon cylindrical nanotubes from X-ray diffraction spectra.

Pleshakov, V. F., E-mail: victorpleshakov@list.ru [FGUP Scientific Research Institute of Electrical Carbon Products (Russian Federation)

2009-12-15T23:59:59.000Z

396

Oxygen adsorption on graphite and nanotubes P. Giannozzi,a)  

E-Print Network [OSTI]

.1063/1.1536636 There is currently a strong interest on the phenomenol- ogy of gas adsorption by carbon nanotubes. Recent experi

Giannozzi, Paolo

397

Nanotubes as Robust Thermal Conductors - Energy Innovation Portal  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Advanced Materials Advanced Materials Find More Like This Return to Search Nanotubes as Robust Thermal Conductors Lawrence Berkeley National Laboratory Contact LBL About This...

398

Photoexcitation of the triplet exciton in single wall carbon nanotubes  

E-Print Network [OSTI]

The carbon nanotube photoexcitation spectrum is dominated by excitonic transitions, rather than interband transitions between continuum states. There are eight distinct excitonic transitions (four singlet and four triplet), ...

Santos, Tiffany S.

399

Apparatus for the Laser Ablative Synthesis of Carbon Nanotubes...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Apparatus for the Laser Ablative Synthesis of Carbon Nanotubes Thomas Jefferson National Accelerator Facility Contact TJNAF About This Technology Technology Marketing SummaryThis...

400

Synthetic nanotubes lay foundation for new technology: Artificial...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Synthetic nanotubes lay foundation for new technology: Artificial pores mimic key features of natural pores By Tona Kunz * July 17, 2012 Tweet EmailPrint Scientists have overcome...

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

Water-splitting using photocatalytic porphyrin-nanotube composite devices  

DOE Patents [OSTI]

A method for generating hydrogen by photocatalytic decomposition of water using porphyrin nanotube composites. In some embodiments, both hydrogen and oxygen are generated by photocatalytic decomposition of water.

Shelnutt, John A. (Tijeras, NM); Miller, James E. (Albuquerque, NM); Wang, Zhongchun (Albuquerque, NM); Medforth, Craig J. (Winters, CA)

2008-03-04T23:59:59.000Z

402

Characterization of composites with aligned carbon nanotubes (CNTs) as reinforcement  

E-Print Network [OSTI]

Carbon nanotubes' (CNTs) superlative combination of electrical, thermal, and especially mechanical properties make them ideal candidates for composite reinforcement. Nanocomposites and hybrid composite architectures employing ...

García, Enrique J

2006-01-01T23:59:59.000Z

403

Thermal Management Using Graphene and Carbon-Nanotubes.  

E-Print Network [OSTI]

??This dissertation investigates the application of graphene and carbon nanotubes (CNTs) for thermal management of high-power batteries and interconnects. The research is focused on three… (more)

Goli, Pradyumna

2014-01-01T23:59:59.000Z

404

Towards structural health monitoring in carbon nanotube reinforced composites  

E-Print Network [OSTI]

An experimental investigation was conducted to understand the non-destructive evaluation (NDE) capabilities of carbon nanotubes (CNTs) of several network architectures towards structural health monitoring (SHM). As ...

Wang, Wennie

2013-01-01T23:59:59.000Z

405

Preparation and Characterisation of Vertically Aligned Carbon Nanotubes.  

E-Print Network [OSTI]

??This thesis presents the preparation of vertically aligned carbon nanotubes using porous anodic alumina templates via thermal chemical vapour deposition. The characteristics of prepared carbon… (more)

Xu, Rui

2010-01-01T23:59:59.000Z

406

Massively Parallel Indirect Dielectrophoresis Controlled Placement of Carbon Nanotubes.  

E-Print Network [OSTI]

??Placement of single walled carbon nanotubes is demonstrated through massively parallel indirect dielectrophoresis (MPID). MPID is shown to be able to control the placement of… (more)

Conley, Hiram Jacob

2009-01-01T23:59:59.000Z

407

Excited State Dynamics of Individual Single-Walled Carbon Nanotubes.  

E-Print Network [OSTI]

??In this work we tried to shed light on issue by excited state dynamics in carbon nanotubes by combining the photoluminescence (PL) spectroscopy with the… (more)

HARUTYUNYAN, HAYK

2009-01-01T23:59:59.000Z

408

Continuous Growth of Vertically Aligned Carbon Nanotubes Forests  

E-Print Network [OSTI]

Vertically aligned carbon nanotubes are one of the most promising materials due their numerous applications in flexible electronic devices, biosensors and multifunctional aircraft materials, among others. However, the ...

Guzman de Villoria, Roberto

409

Scaffolding Carbon Nanotubes into Single-Molecule Circuitry  

E-Print Network [OSTI]

Carbon Nanotubes into Single-Molecule Circuitry Brett R.to a single binding site, single molecule precision can beto directly transduce single-molecule interactions such as

Collins, Philip G

2007-01-01T23:59:59.000Z

410

NASA Scientist Discusses Nanotube Advances Feb. 9 at Jefferson...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Nanotube Advances Feb. 9 at Jefferson Lab NEWPORT NEWS, Va., Feb. 2, 2011 - Mike Smith, a NASA Langley Research Center scientist, will present a lecture titled "20th...

411

Synthesis of chalcogenide ternary and quaternary nanotubes through directed compositional alterations of bacterial As--S nanotubes  

E-Print Network [OSTI]

Synthesis of chalcogenide ternary and quaternary nanotubes through directed compositional alterations of bacterial As--S nanotubes Shenghua Jiang,a Fang Liu,b Min-Gyu Kim,c Jae-Hong Lim,b Kun-Jae Lee--S--Se and As--Cd--S) and quaternary (i.e. As--Cd--S--Se) composite nanotubes were synthesized using biotic As

Chen, Wilfred

412

Photochemical Crosslinking Reactions in Polymers.  

E-Print Network [OSTI]

??The post-synthesis modification of polymer properties has very broad applications in industry. It is employed to produce products that are impossible to directly synthesize, modify… (more)

Carbone, Nicholas

2012-01-01T23:59:59.000Z

413

Acoustic emission during polymer crystallization  

Science Journals Connector (OSTI)

... .G.; part support to L.K.) Acoustic Emission, Special Technical Publication 505, ASTM, Philadelphia, 1971; Grabec, I. & Peterlin, A. J. Polymer Sci. ...

A. Galeski; L. Koenczoel; E. Piorkowska; E. Baer

1987-01-01T23:59:59.000Z

414

Photopatterned conjugated polymer electrochromic nanofibers Arvind Kumara  

E-Print Network [OSTI]

Photopatterned conjugated polymer electrochromic nanofibers on paper Arvind Kumara , Chris Asemotaa. Electrochromic nanofibers of conducting polymer (terthiophene) have been deposited over a conventional paper in electrochromic characters. SEM images of the conducting polymer nanofibers together with the cellulose fibers

Otero, Toribio Fernández

415

Infrared Spectra of Individual Semiconducting Single-walled Carbon Nanotubes: Testing the Scaling of Transition Energies for Large Diameter Nanotubes  

SciTech Connect (OSTI)

We have measured the low-energy excitonic transitions of chiral assigned individual large-diameter semiconducting single-walled nanotubes using a high-resolution Fourier transform photoconductivity technique. When photoconductivity is complemented by Rayleigh scattering spectroscopy, as many as five optical transitions can be identified on the same individual nanotube over an energy range of 0.3-2.7 eV. We find that well-established energy scaling relations developed for nanotubes of smaller diameter are not consistent with the measured low-energy transitions in large (1.8-2.3 nm) diameter nanotubes.

M Sfeir; J Misewich; S Rosenblatt; Y Wu; C Voisin; H Yan; S Berciaud; T Heinz; B Chandra; et al.

2011-12-31T23:59:59.000Z

416

Raman excitation profiles for the (n1, n2) assignment in carbon nanotubes  

E-Print Network [OSTI]

Raman excitation profiles for the (n1, n2) assignment in carbon nanotubes H. Telg , J. Maultzsch indices n1 and n2 in semiconducting and metallic nanotubes was performed comparing resonance Raman nanotube families. Ever since the discovery of how to keep isolated nanotubes from rebundeling in solu

Nabben, Reinhard

417

10.1098/rsta.2004.1444 Resonant Raman spectroscopy of nanotubes  

E-Print Network [OSTI]

10.1098/rsta.2004.1444 Resonant Raman spectroscopy of nanotubes By Christian Thomsen1 , Stephanie. The experimental situation in carbon nanotubes is reviewed in view of these criteria. The evidence for the D mode for the application of Raman scattering to the characterization of nanotubes are discussed. Keywords: carbon nanotubes

Nabben, Reinhard

418

ensl-00109517,version1-24Oct2006 Superconducting instability in 3 bands metallic nanotubes  

E-Print Network [OSTI]

ensl-00109517,version1-24Oct2006 Superconducting instability in 3 bands metallic nanotubes David on small radius nanotubes, we study the superconducting in- stabilities of cylindrical (5,0) nanotubes. According to band structure calculations, these nanotubes possess three bands at the Fermi energy. Using

419

ccsd-00001984,version1-18Oct2004 Selective production of metallic carbon nanotubes  

E-Print Network [OSTI]

ccsd-00001984,version1-18Oct2004 Selective production of metallic carbon nanotubes Yasushi- type nanotubes (metallic character) evaluated using the previous H¨uckel-Poisson method can be applied at the tip of a nanotube in a realistic system. Setting the cross-section of a nanotube and the external

Paris-Sud XI, Université de

420

Helicity in Ropes of Chiral Nanotubes: Calculations and Observation David Teich,1  

E-Print Network [OSTI]

of such helices is the energy gain associated with the optimum orientational alignment of neighboring nanotubes in helical nanotube ropes and specify under which conditions straight nanotube bundles gain energy upon nanotubes outweighs the coiling stress. Our total energy calculations allow us to analyze the torsional

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

Electronic band structure of isolated and bundled carbon nanotubes S. Reich and C. Thomsen  

E-Print Network [OSTI]

for nanotubes with larger diameters 1­1.5 nm a shift of the energy levels of 100 meV is obtained in our abElectronic band structure of isolated and bundled carbon nanotubes S. Reich and C. Thomsen Institut in chiral and achiral isolated nanotubes as well as in carbon nanotube bundles. The curvature

Nabben, Reinhard

422

Length control of individual carbon nanotubes by nanostructuring with a scanning tunneling microscope  

E-Print Network [OSTI]

and quantum-size energy-level splitting.6,7 The quantum transport properties of nanotubes strongly dependLength control of individual carbon nanotubes by nanostructuring with a scanning tunneling of carbon nanotubes. Individual carbon nanotubes can be locally cut by applying a voltage pulse to the tip

423

204 IEEE TRANSACTIONS ON NANOBIOSCIENCE, VOL. 5, NO. 3, SEPTEMBER 2006 Using Carbon Nanotubes to Absorb  

E-Print Network [OSTI]

activated carbon in this regard. Fluorescence intensity of the carbon nanotube with and without immersion204 IEEE TRANSACTIONS ON NANOBIOSCIENCE, VOL. 5, NO. 3, SEPTEMBER 2006 Using Carbon Nanotubes the interaction between hydrogen sulfide and carbon nanotube. The carbon nanotube is chosen because of a known

Zhang, WJ "Chris"

424

Breakdown of 2mm symmetry in electron diffraction from multiwalled carbon nanotubes  

E-Print Network [OSTI]

Breakdown of 2mm symmetry in electron diffraction from multiwalled carbon nanotubes Zejian Liu of single-walled carbon nanotubes always have 2mm symmetry regardless if the nanotubes them- selves have such symmetry. We here show that, for the case of multiwalled carbon nanotubes, the 2mm symmetry can break down

Qin, Lu-Chang

425

Hybrid Silicon Nanocone–Polymer Solar Cells  

Science Journals Connector (OSTI)

Hybrid Silicon Nanocone–Polymer Solar Cells ... In this study, we demonstrate a hybrid solar cell composed of Si nanocones and conductive polymer. ...

Sangmoo Jeong; Erik C. Garnett; Shuang Wang; Zongfu Yu; Shanhui Fan; Mark L. Brongersma; Michael D. McGehee; Yi Cui

2012-04-30T23:59:59.000Z

426

Webinar: Hydrogen Production by Polymer Electrolyte Membrane...  

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

Production by Polymer Electrolyte Membrane (PEM) Electrolysis-Spotlight on Giner and Proton Webinar: Hydrogen Production by Polymer Electrolyte Membrane (PEM) Electrolysis-Spotligh...

427

Electronic properties of single-walled silicon nanotubes compared to carbon nanotubes  

Science Journals Connector (OSTI)

Using the first principles method, we have investigated the electronic properties of Si-based single-walled nanotubes with different diameters and chiral vectors. The electronic properties show significant difference with those of carbon nanotubes. Si gearlike nanotubes (g-NTs) are more stable according to the formation energies, as Si atoms prefer the sp3 hybridization. Si (n,n)(n=5–11) g-NTs are semiconductors, whose gaps decrease as the diameters increase. Si (n,0)(n=10–24) g-NTs are semiconductors and the gaps decrease in a period of 3. The results for large Si g-NTs can be explained using the tight-binding model and the method of Brillouin zone foldings. The (n,0)(n=5–9) tubes are metal due to the ?* and ?* mixing, which is rather strong for the small tubes.

Xiaobao Yang and Jun Ni

2005-11-22T23:59:59.000Z

428

Polymers in a Vacuum  

SciTech Connect (OSTI)

In a variety of situations, isolated polymer molecules are found in a vacuum, and here we examine their properties. Angular momentum conservation is shown to significantly alter the average size of a chain and its conservation is only broken slowly by thermal radiation. For an ideal chain, the time autocorrelation for monomer position oscillates with a period proportional to chain length. The oscillations and damping are analyzed in detail. Short-range repulsive interactions suppress oscillations and speed up relaxation, but stretched chains still show damped oscillatory correlations.

Deutsch, J. M. [Department of Physics, University of California, Santa Cruz, California 95064 (United States)

2007-12-07T23:59:59.000Z

429

Nanotubes Complexed with DNA and Proteins for Resistive-Pulse Sensing  

Science Journals Connector (OSTI)

We also show that both the electronic type and degree of bundling of the nanotubes in the nanotube/TiO2 complex are crit. ... It is shown here that the strong optical absorbance of single-walled carbon nanotubes (SWNTs) in this special spectral window, an intrinsic property of SWNTs, can be used for optical stimulation of nanotubes inside living cells to afford multifunctional nanotube biol. ... This study represents the first in depth investigation of protein structure and function on carbon nanotubes, which is crit. in designing optimal carbon nanotube-protein conjugates. ...

Jingjie Sha; Tawfique Hasan; Silvia Milana; Cristina Bertulli; Nicholas A. W. Bell; Giulia Privitera; Zhonghua Ni; Yunfei Chen; Francesco Bonaccorso; Andrea C. Ferrari; Ulrich F. Keyser; Yan Yan S. Huang

2013-09-25T23:59:59.000Z

430

Density controlled carbon nanotube array electrodes  

DOE Patents [OSTI]

CNT materials comprising aligned carbon nanotubes (CNTs) with pre-determined site densities, catalyst substrate materials for obtaining them and methods for forming aligned CNTs with controllable densities on such catalyst substrate materials are described. The fabrication of films comprising site-density controlled vertically aligned CNT arrays of the invention with variable field emission characteristics, whereby the field emission properties of the films are controlled by independently varying the length of CNTs in the aligned array within the film or by independently varying inter-tubule spacing of the CNTs within the array (site density) are disclosed. The fabrication of microelectrode arrays (MEAs) formed utilizing the carbon nanotube material of the invention is also described.

Ren, Zhifeng F. (Newton, MA); Tu, Yi (Belmont, MA)

2008-12-16T23:59:59.000Z

431

Carbon nanotube plectonemes: Loops of twisted helices  

E-Print Network [OSTI]

The relaxation of twist in elastic filaments often drives conformational changes. We explore this paradigm using all-atom computations and report the formation of novel supercoiled shapes in individual carbon nanotubes (CNTs). Decreasing the end distance of torsionally constrained CNTs leads to spontaneous nucleation and growth of a nanotube plectoneme. We develop a stability diagram and comparisons with theoretical frameworks reveal the importance of non-local van Der Waals interactions. In some cases, they stabilize the supercoiling to an extent that its tip locally kinks and then irreversibly reconstructs into a disordered yet strengthened structure that involves $sp^3$ bonding. The ability to engineer supercoiled conformations of CNTs and related nanoscale filaments opens the possibility of a unique set of tunable functional properties at the nanoscale.

Alireza Shahabi; Moneesh Upmanyu

2014-10-27T23:59:59.000Z

432

Vacuum flash evaporated polymer composites  

DOE Patents [OSTI]

A method for fabrication of polymer composite layers in a vacuum is disclosed. More specifically, the method of dissolving salts in a monomer solution, vacuum flash evaporating the solution, condensing the flash evaporated solution as a liquid film, and forming the condensed liquid film into a polymer composite layer on a substrate is disclosed.

Affinito, J.D.; Gross, M.E.

1997-10-28T23:59:59.000Z

433

An ultrafast carbon nanotube terahertz polarisation modulator  

SciTech Connect (OSTI)

We demonstrate ultrafast modulation of terahertz radiation by unaligned optically pumped single-walled carbon nanotubes. Photoexcitation by an ultrafast optical pump pulse induces transient terahertz absorption in nanowires aligned parallel to the optical pump. By controlling the polarisation of the optical pump, we show that terahertz polarisation and modulation can be tuned, allowing sub-picosecond modulation of terahertz radiation. Such speeds suggest potential for semiconductor nanowire devices in terahertz communication technologies.

Docherty, Callum J.; Stranks, Samuel D.; Habisreutinger, Severin N.; Joyce, Hannah J.; Herz, Laura M.; Nicholas, Robin J.; Johnston, Michael B., E-mail: m.johnston@physics.ox.ac.uk [Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU (United Kingdom)

2014-05-28T23:59:59.000Z

434

Energy dispersion in graphene and carbon nanotubes and molecular encapsulation in nanotubes  

Science Journals Connector (OSTI)

Density-functional calculations of electronic and vibrational dispersion energies for pristine graphite monolayer (graphene) and single-walled carbon nanotubes (SWCNTs) are presented. Optimized parameters for nonlocal norm-preserving pseudopotentials which replace the potential field due to core electrons are given. Comparison with observations, where available, is made. The effect of encapsulation of carbon nanotubes with an alkali-halide matrix is numerically investigated. The electronic band structure of encapsulated SWCNT is noticeably modified, as is its charge density, and hence its optical properties.

K. V. Christ and H. R. Sadeghpour

2007-05-15T23:59:59.000Z

435

Materials - Recycling - Polymer Matrix Composites  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (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

436

Accelerated Characterization of Polymer Properties  

SciTech Connect (OSTI)

This report describes the efforts to develop a suite of microanalysis techniques that can rapidly measure a variety of polymer properties of industrial importance, including thermal, photo-oxidative, and color stability; as well as ductility, viscosity, and mechanical and antistatic properties. Additional goals of the project were to direct the development of these techniques toward simultaneous measurements of multiple polymer samples of small size in real time using non-destructive and/or parallel or rapid sequential measurements, to develop microcompounding techniques for preparing polymers with additives, and to demonstrate that samples prepared in the microcompounder could be analyzed directly or used in rapid off-line measurements. These enabling technologies are the crucial precursors to the development of high-throughput screening (HTS) methodologies for the polymer additives industry whereby the rate of development of new additives and polymer formulations can be greatly accelerated.

R. Wroczynski; l. Brewer; D. Buckley; M. Burrell; R. Potyrailo

2003-07-30T23:59:59.000Z

437

Polymer formulations for gettering hydrogen  

DOE Patents [OSTI]

A novel method for preparing a hydrogenation composition comprising organic polymer molecules having carbon--carbon double bonds, for removing hydrogen from the atmosphere within enclosed spaces and particularly from atmospheres within enclosed spaces that contain air, water vapor, oxygen, carbon dioxide or ammonia. The organic polymers molecules containing carbon--carbon double bonds throughout their structures, preferably polybutadiene, polyisoprene and derivatives thereof, intimately mixed with an insoluble noble metal catalyst composition. High molecular weight polymers may be added to the organic polymer/catalyst mixture in order to improve their high temperature performance. The hydrogenation composition is prepared by dispersing the polymers in a suitable solvent, forming thereby a solution suspension, flash-freezing droplets of the solution in a liquid cryogen, freeze-drying the frozen droplets to remove frozen solvent incorporated in the droplets, and recovering the dried powder thus formed.

Shepodd, Timothy J. (330 Thrasher Ave., Livermore, CA 94550); Even, Jr., William R. (4254 Drake Way, Livermore, CA 94550)

2000-01-01T23:59:59.000Z

438

Fundamental studies of polymer filtration  

SciTech Connect (OSTI)

This is the final report of a one-year, Laboratory Directed Research and Development (LDRD) project at Los Alamos National Laboratory (LANL). The objectives of this project were (1) to develop an enhanced fundamental understanding of the coordination chemistry of hazardous-metal-ion complexation with water-soluble metal-binding polymers, and (2) to exploit this knowledge to develop improved separations for analytical methods, metals processing, and waste treatment. We investigated features of water-soluble metal-binding polymers that affect their binding constants and selectivity for selected transition metal ions. We evaluated backbone polymers using light scattering and ultrafiltration techniques to determine the effect of pH and ionic strength on the molecular volume of the polymers. The backbone polymers were incrementally functionalized with a metal-binding ligand. A procedure and analytical method to determine the absolute level of functionalization was developed and the results correlated with the elemental analysis, viscosity, and molecular size.

Smith, B.F.; Lu, M.T.; Robison, T.W.; Rogers, Y.C.; Wilson, K.V.

1998-12-31T23:59:59.000Z

439

THERMAL PROPERTIES OF SINGLE-WALLED CARBON NANOTUBES Shigeo MARUYAMA  

E-Print Network [OSTI]

, optical and mechanical properties, thermal properties of SWNTs are quite unique with the high thermal and thermal conductance between a nanotube and various materials are reviewed. The experimental approach, and thermal boundary resistance in a junction of nanotubes are reviewed. Then, the heat transfer from an SWNT

Maruyama, Shigeo

440

Apparatus for the laser ablative synthesis of carbon nanotubes  

DOE Patents [OSTI]

An RF-induction heated side-pumped synthesis chamber for the production of carbon nanotubes. Such an apparatus, while capable of producing large volumes of carbon nanotubes, concurrently provides a simplified apparatus that allows for greatly reduced heat up and cool down times and flexible flowpaths that can be readily modified for production efficiency optimization.

Smith, Michael W. (Newport News, VA); Jordan, Kevin (Newport News, VA)

2010-02-16T23:59:59.000Z

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

Phonon eigenvectors of chiral nanotubes S. Reich and C. Thomsen  

E-Print Network [OSTI]

Phonon eigenvectors of chiral nanotubes S. Reich and C. Thomsen Institut fu¨r Festko of chiral carbon nanotubes may differ signifi- cantly from those of the usually considered, simpler achiral tubes. We show that the phonon eigenvectors, e.g., of the high-energy eigenmodes no longer fall

Nabben, Reinhard

442

Raman Measurements on Electrochemically Doped Single-Walled Carbon Nanotubes  

E-Print Network [OSTI]

Raman Measurements on Electrochemically Doped Single-Walled Carbon Nanotubes P. M. Rafailov, M and studied the Raman response of electro- chemically doped single-walled carbon nanotubes (SWNT) using different salt solutions. The fre- quency shift of the radial breathing mode (RBM) and the high-energy mode

Nabben, Reinhard

443

Phonon dispersion of carbon nanotubes J. Maultzscha,*, S. Reicha  

E-Print Network [OSTI]

Phonon dispersion of carbon nanotubes J. Maultzscha,*, S. Reicha , C. Thomsena , E. Dobardz the phonon dispersion relations of single-wall carbon nanotubes calculated within a force-constants approach 6 and 12 cm21 independent of the tube diameter. The order of the high-energy modes at the G

Nabben, Reinhard

444

Computational Study of Catalyzed Growth of Single Wall Carbon Nanotubes  

E-Print Network [OSTI]

-end-closed nanotubes with different chiralities, which is believed to be the basic step of nanotube elongation, are studied as a function of tube length. The energy and shape of the frontier highest occupied molecular orbital (HOMO) and lowest unoccupied molecular...

Zhao, Jin

2010-01-14T23:59:59.000Z

445

Plasma-induced alignment of carbon nanotubes Chris Bowera)  

E-Print Network [OSTI]

. Here we report the growth of aligned carbon nanotubes using high-frequency, microwave plasma enhanced cylindrical growth chamber and a molybdenum sub- strate stage with a radio-frequency rf graphite heaterPlasma-induced alignment of carbon nanotubes Chris Bowera) Department of Physics and Astronomy

446

Anode Sheath Switching in a Carbon Nanotube Arc Plasma  

SciTech Connect (OSTI)

The anode ablation rate is investigated as a function of anode diameter for a carbon nanotube arc plasma. It is found that anomalously high ablation occurs for small anode diameters. This result is explained by the formation of a positive anode sheath. The increased ablation rate due to this positive anode sheath could imply greater production rate for carbon nanotubes.

Abe Fetterman, Yevgeny Raitses, and Michael Keidar

2008-04-08T23:59:59.000Z

447

Optical absorption intensity of semiconductor single-wall carbon nanotubes  

E-Print Network [OSTI]

Optical absorption intensity of semiconductor single-wall carbon nanotubes Y. Oyama1 , R. Saito1. The optical absorption intensity is inversely proportional to the diameter in the unit of per carbon atom of single-wall carbon nanotubes (SWNT) synthesized by alcohol CCVD (ACCVD) method and HiPco method [1

Maruyama, Shigeo

448

Contracting Polymer with Current  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Contracting Polymer with Current Contracting Polymer with Current Name: Ian Status: student Grade: 9-12 Location: PA Country: USA Date: Summer 2011 Question: Hello and thank you in advance. I have previously read of a material ( a kind of "rubber") that contracts when an electric current is applied. My question is what is this material, how does it work/what is it made of? Thank you very much. Replies: Hi Ian, I believe the material you are referring to is a kind of piezoelectric rubber. Piezoelectric materials (usually they are special types of ceramics or crystals) produce an electrical voltage when compressed of otherwise subjected to stress. They also do the opposite... they slightly expand or contract when a voltage is applied. But the amount they expand or contract is very small indeed. For example, one square meter of the recently discovered piezoelectric rubber materials typically contracts a mere 100 picometers for ever applied volt. Translated into everyday measurements, this means that if you apply a voltage of 1 Volt to a one foot long piece of this rubber, it will only contract less than half a billionth of an inch! Applying 100 volts will cause it to contract just under 50 billionths of an inch!

449

Dynamic response of phenolic resin and its carbon-nanotube composites to shock wave loading  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

We investigate with nonreactive molecular dynamics simulations the dynamic response of phenolic resin and its carbon-nanotube (CNT) composites to shock wave compression. For phenolic resin, our simulations yield shock states in agreement with experiments on similar polymers except the “phase change” observed in experiments, indicating that such phase change is chemical in nature. The elastic–plastic transition is characterized by shear stress relaxation and atomic-level slip, and phenolic resin shows strong strain hardening. Shock loading of the CNT-resin composites is applied parallel or perpendicular to the CNT axis, and the composites demonstrate anisotropy in wave propagation, yield and CNT deformation. The CNTs induce stress concentrations in the composites and may increase the yield strength. Our simulations suggest that the bulk shock response of the composites depends on the volume fraction, length ratio, impact cross-section, and geometry of the CNT components; the short CNTs in current simulations have insignificant effect on the bulk response of resin polymer.

Arman, B. [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States) and Texas A and M Univ., College Station, TX (United States); An, Q. [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States) and California Institute of Technology, Pasedena, CA (United States); Luo, S. N. [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Desai, T. G. [Advanced Cooling Technologies, Inc., Lancaster, PA (United States); Tonks, D. L. [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Cagin, T. [Texas A and M Univ., College Station, TX (United States); Goddard III, W. A. [California Institute of Technology, Pasedena, CA (United States)

2011-01-04T23:59:59.000Z

450

Rotational actuator of motor based on carbon nanotubes  

DOE Patents [OSTI]

A rotational actuator/motor based on rotation of a carbon nanotube is disclosed. The carbon nanotube is provided with a rotor plate attached to an outer wall, which moves relative to an inner wall of the nanotube. After deposit of a nanotube on a silicon chip substrate, the entire structure may be fabricated by lithography using selected techniques adapted from silicon manufacturing technology. The structures to be fabricated may comprise a multiwall carbon nanotube (MWNT), two in plane stators S1, S2 and a gate stator S3 buried beneath the substrate surface. The MWNT is suspended between two anchor pads and comprises a rotator attached to an outer wall and arranged to move in response to electromagnetic inputs. The substrate is etched away to allow the rotor to freely rotate. Rotation may be either in a reciprocal or fully rotatable manner.

Zettl, Alexander K. (Kensington, CA); Fennimore, Adam M. (Berkeley, CA); Yuzvinsky, Thomas D. (Berkeley, CA)

2008-11-18T23:59:59.000Z

451

Synthetic nanotubes lay foundation for new technology: Artificial pores  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Synthetic nanotubes lay foundation for new technology: Artificial pores Synthetic nanotubes lay foundation for new technology: Artificial pores mimic key features of natural pores By Tona Kunz * July 17, 2012 Tweet EmailPrint Scientists have overcome key design hurdles to expand the potential uses of nanopores and nanotubes. The creation of smart nanotubes with selective mass transport opens up a wider range of applications for water purification, chemical separation and fighting disease. Nanopores and their rolled up version, nanotubes, consist of atoms bonded to each other in a hexagonal pattern to create an array of nanometer-scale openings or channels. This structure creates a filter that can be sized to select which molecules and ions pass into drinking water or into a cell. The same filter technique can limit the release of chemical by-products

452

Phonon spectrum and interaction between nanotubes in single-walled carbon nanotube bundles at high pressures and temperatures  

SciTech Connect (OSTI)

The Raman spectra of single-walled carbon nanotubes at temperatures up to 730 K and pressures up to 7 GPa have been measured. The behavior of phonon modes and the interaction between nanotubes in bundles have been studied. It has been found that the temperature shift of the vibrational G mode is completely reversible, whereas the temperature shift of radial breathing modes is partially irreversible and the softening of the modes and narrowing of phonon bands are observed. The temperature shift and softening of radial breathing modes are also observed when samples are irradiated by laser radiation with a power density of 6.5 kW/mm{sup 2}. The dependence of the relative frequency {Omega}/{Omega}{sub 0} for G{sup +} and G{sup -} phonon modes on the relative change A{sub 0}/A in the triangular lattice constant of bundles of nanotubes calculated using the thermal expansion coefficient and compressibility coefficient of nanotube bundles shows that the temperature shift of the G mode is determined by the softening of the C-C bond in nanotubes. An increase in the equilibrium distances between nanotubes at the breaking of random covalent C-C bonds between nanotubes in bundles of nanotubes is in my opinion the main reason for the softening of the radial breathing modes.

Meletov, K. P., E-mail: mele@issp.ac.ru [Russian Academy of Sciences, Institute of Solid State Physics (Russian Federation)

2012-12-15T23:59:59.000Z

453

SULFUR POLYMER ENCAPSULATION.  

SciTech Connect (OSTI)

Sulfur polymer cement (SPC) is a thermoplastic polymer consisting of 95 wt% elemental sulfur and 5 wt% organic modifiers to enhance long-term durability. SPC was originally developed by the U.S. Bureau of Mines as an alternative to hydraulic cement for construction applications. Previous attempts to use elemental sulfur as a construction material in the chemical industry failed due to premature degradation. These failures were caused by the internal stresses that result from changes in crystalline structure upon cooling of the material. By reacting elemental sulfur with organic polymers, the Bureau of Mines developed a product that successfully suppresses the solid phase transition and significantly improves the stability of the product. SPC, originally named modified sulfur cement, is produced from readily available, inexpensive waste sulfur derived from desulfurization of both flue gases and petroleum. The commercial production of SPC is licensed in the United States by Martin Resources (Odessa, Texas) and is marketed under the trade name Chement 2000. It is sold in granular form and is relatively inexpensive ({approx}$0.10 to 0.12/lb). Application of SPC for the treatment of radioactive, hazardous, and mixed wastes was initially developed and patented by Brookhaven National Laboratory (BNL) in the mid-1980s (Kalb and Colombo, 1985; Colombo et al., 1997). The process was subsequently investigated by the Commission of the European Communities (Van Dalen and Rijpkema, 1989), Idaho National Engineering Laboratory (Darnell, 1991), and Oak Ridge National Laboratory (Mattus and Mattus, 1994). SPC has been used primarily in microencapsulation applications but can also be used for macroencapsulation of waste. SPC microencapsulation has been demonstrated to be an effective treatment for a wide variety of wastes, including incinerator hearth and fly ash; aqueous concentrates such as sulfates, borates, and chlorides; blowdown solutions; soils; and sludges. It is not recommended for treatment of wastes containing high concentrations of nitrates because of potentially dangerous reactions between sulfur, nitrate, and trace quantities of organics. Recently, the process has been adapted for the treatment of liquid elemental mercury and mercury contaminated soil and debris.

KALB, P.

2001-08-22T23:59:59.000Z

454

The workshop on conductive polymers: Final report  

SciTech Connect (OSTI)

Reports are made by groups on: polyacetylene, polyphenylene, polyaniline, and related systems; molecular, crystallographic, and defect structures in conducting polymers; heterocyclic polymers; synthesis of new and improved conducting polymers; future applications possibilities for conducting polymers; and challenges for improved understanding of properties. (DLC)

Not Available

1985-01-01T23:59:59.000Z

455

46 (2009-6) Nucleation of a single-walled carbon nanotube inside a carbon nanotube  

E-Print Network [OSTI]

of the metal-carbide. Key Words : Molecular Dynamics, Double-Walled Carbon Nanotube, Growth Mechanism, Carbon functions of carbon atoms and metal atoms in the metal carbide cluster #12;,10) Carbon (11,11) Carbon (15,6) Carbon (10,10) Metal (11,11) Metal (15,6) Metal Fig. 4 Density distribution

Maruyama, Shigeo

456

Thermodynamics of tubelike flexible polymers  

E-Print Network [OSTI]

In this work we present the general phase behavior of short tubelike flexible polymers. The geometric thickness constraint is implemented through the concept of the global radius of curvature. We use sophisticated Monte Carlo sampling methods to simulate small bead-stick polymer models with Lennard-Jones interaction among non-bonded monomers. We analyze energetic fluctuations and structural quantities to classify conformational pseudophases. We find that the tube thickness influences the thermodynamic behavior of simple tubelike polymers significantly, i.e., for given temperature, the formation of secondary structures strongly depends on the tube thickness.

Thomas Vogel; Thomas Neuhaus; Michael Bachmann; Wolfhard Janke

2009-07-17T23:59:59.000Z

457

Thermodynamics of tubelike flexible polymers  

Science Journals Connector (OSTI)

In this work, we discuss the general phase behavior of short tubelike flexible polymers. The geometric thickness constraint is implemented through the concept of the global radius of curvature. We use sophisticated Monte Carlo sampling methods to simulate small bead-stick polymer models with Lennard-Jones interaction among nonbonded monomers. We analyze energetic fluctuations and structural quantities to classify conformational pseudophases. We find that the tube thickness influences the thermodynamic behavior of simple tubelike polymers significantly, i.e., for a given temperature, the formation of secondary structures strongly depends on the tube thickness.

Thomas Vogel; Thomas Neuhaus; Michael Bachmann; Wolfhard Janke

2009-07-16T23:59:59.000Z

458

A conjugated polymer plastic gel  

E-Print Network [OSTI]

We present a gel route to process highly oriented conjugated polymer films and fibers. The incorporation of hexafluoroisopropanol, a strong and stable dipolar group, to the polythiophene backbone enhances the solubility ...

Alcazar Jorba, Daniel

2008-01-01T23:59:59.000Z

459

Polymers For Advanced Lithium Batteries  

Broader source: Energy.gov (indexed) [DOE]

Accomplishments 1 m SEM of cathode LiFePO 4 +Binder (5050) Nothing else, no optimization Li metal (anode) Al current collector Polymer electrolyte membrane (S-EO-S)...

460

Polymers, Fractals, and Ceramic Materials  

Science Journals Connector (OSTI)

...application primarily as optical coatings and aerogels. Aerogels (1...4) Gelation //Polymer x Coating_rn Film Monomer Aggregation...Sintering.......... Aerogel Monolith Fig. 1. Ceramic...desired for index-matched coatings, then base-catalyzed materials...

DALE W. SCHAEFER

1989-02-24T23:59:59.000Z

Note: This page contains sample records for the topic "umbilicals polymer nanotube" 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

Layered plasma polymer composite membranes  

DOE Patents [OSTI]

Layered plasma polymer composite fluid separation membranes are disclosed, which comprise alternating selective and permeable layers for a total of at least 2n layers, where n is [>=]2 and is the number of selective layers. 2 figs.

Babcock, W.C.

1994-10-11T23:59:59.000Z

462

Characterization of macro-length conducting polymers and the development of a conducting polymer rotary motor  

E-Print Network [OSTI]

Conducting polymers are a subset of materials within the electroactive polymer class that exhibit active mechanical deformations. These deformations induce stresses and strains that allow for conducting polymers to be used ...

Schmid, Bryan D. (Bryan David), 1981-

2005-01-01T23:59:59.000Z

463

Viscosity of Ring Polymer Melts  

Science Journals Connector (OSTI)

Viscosity of Ring Polymer Melts ... The ratio of the zero-shear viscosities of linear polymer melts ?0,linear to their ring counterparts ?0,ring at isofrictional conditions is discussed as a function of the number of entanglements Z. ... For this reason we have determined the viscosities by fitting the complex viscosity curves with different methods to obtain reliable estimates and error bars (see Supporting Information). ...

Rossana Pasquino; Thodoris C. Vasilakopoulos; Youn Cheol Jeong; Hyojoon Lee; Simon Rogers; George Sakellariou; Jürgen Allgaier; Atsushi Takano; Ana R. Brás; Taihyun Chang; Sebastian Gooßen; Wim Pyckhout-Hintzen; Andreas Wischnewski; Nikos Hadjichristidis; Dieter Richter; Michael Rubinstein; Dimitris Vlassopoulos

2013-09-17T23:59:59.000Z

464

High cation transport polymer electrolyte  

DOE Patents [OSTI]

A solid state ion conducting electrolyte and a battery incorporating same. The electrolyte includes a polymer matrix with an alkali metal salt dissolved therein, the salt having an anion with a long or branched chain having not less than 5 carbon or silicon atoms therein. The polymer is preferably a polyether and the salt anion is preferably an alkyl or silyl moiety of from 5 to about 150 carbon/silicon atoms.

Gerald, II, Rex E. (Brookfield, IL); Rathke, Jerome W. (Homer Glen, IL); Klingler, Robert J. (Westmont, IL)

2007-06-05T23:59:59.000Z

465

High Temperature Polymer Membrane Development at Argonne National...  

Broader source: Energy.gov (indexed) [DOE]

Polymer Membrane Development at Argonne National Laboratory High Temperature Polymer Membrane Development at Argonne National Laboratory Summary of ANL's high temperature polymer...

466

Hydrogen-Bond Acidic Polymers for Chemical Vapor Sensing. | EMSL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Acidic Polymers for Chemical Vapor Sensing. Hydrogen-Bond Acidic Polymers for Chemical Vapor Sensing. Abstract: A review with 171 references. Hydrogen-bond acidic polymers for...

467

Carbon Nanotubes Potentialities in Directional Dark Matter Searches  

E-Print Network [OSTI]

We propose a new solution to the problem of dark matter directional detection based on large parallel arrays of carbon nanotubes. The phenomenon of ion channeling in single wall nanotubes is simulated to calculate the expected number of recoiling carbon ions, due to the hypothetical scattering with dark matter particles, subsequently being driven along their longitudinal extension. As shown by explicit calculation, the relative orientation of the carbon nanotube array with respect to the direction of motion of the Sun has an appreciable effect on the channeling probability of the struck ion and this provides the required detector anisotropic response.

L. M. Capparelli; G. Cavoto; D. Mazzilli; A. D. Polosa

2014-12-28T23:59:59.000Z

468

Single-wall carbon nanotubes as coherent plasmon generators  

Science Journals Connector (OSTI)

The possibility of low-energy surface plasmon amplification by optically excited excitons in small-diameter single-wall carbon nanotubes is theoretically demonstrated. The nonradiative exciton-plasmon energy transfer causes the buildup of macroscopic population numbers of coherent localized surface plasmons associated with high-intensity coherent local fields formed at nanoscale throughout the nanotube surface. These strong local fields can be used in a variety of new optoelectronic applications of carbon nanotubes, including near-field nonlinear-optical probing and sensing, optical switching, enhanced electromagnetic absorption, and materials nanoscale modification.

I. V. Bondarev

2012-01-30T23:59:59.000Z

469

Fast reverse osmosis using boron nitride and carbon nanotubes  

Science Journals Connector (OSTI)

We investigate reverse osmosis through commonly used polymeric and advanced inorganic nanotube based semipermeable membranes by performing nonequilibrium molecular dynamics simulations. Simulations indicate that there is a significantly higher water flux through boron-nitride nanotube (BNNT) and carbon nanotube(CNT) compared to a polymethyl methacrylate (PMMA) pore and a slightly higher water flux through BNNT as compared to CNT. The calculated permeation coefficient is in reasonable agreement with the theoretical single-file “hopping” model. Potential of mean force analysis indicates that the irregular nature of PMMA pore surface can cause significant localized energy barriers inside the pore thereby reducing the water flux.

M. E. Suk; A. V. Raghunathan; N. R. Aluru

2008-01-01T23:59:59.000Z

470

On the possible optical resonance in carbon nanotubes based cavities  

Science Journals Connector (OSTI)

An enhanced interference phenomenon in the IR absorbance-wavenumber profiles of ship-shaped carbon nanotubes powder has been observed by attenuated total reflection at room temperature. This room temperature interference phenomenon was considered as possibly originating from an optical resonance effect and that single carbon nanotubes could act as individual Fabry-Perot or Lummer-Gehrcke resonant cavities. It is demonstrated that this interference phenomenon could be an Anderson type localisation phenomenon due to resonant modes in the semi-disordered ship-shaped carbon nanotubes nanopowder which could form a plausible resonant cavity.

M. Maaza; T. Mhlungu; M.O. Ndwandwe; N. Cingo; A.C. Beye; A. Govindaraj; C.N.R. Rao

2007-01-01T23:59:59.000Z

471

Novel Semiconducting Silicon and Germanium Nanotubes  

E-Print Network [OSTI]

In this work we report new silicon and germanium nanotube structures, with no corresponding stable carbon analogues and which cannot be described by integer chiral indices. The electronic and mechanical properties of these new tubes were investigated through ab initio methods. Our results show that the structures are stable up to high temperatures (500 and 1000 K, for silicon and germanium tubes, respectively). Both tubes are semiconducting with small indirect band gaps, which can be significantly altered by both compressive and tensile strains. They also present high Young modulus values (0.25 and 0.15 TPa, respectively).

Perim, Eric; Botari, Tiago; Galvao, Douglas S

2014-01-01T23:59:59.000Z

472

Schrödinger operators on armchair nanotubes. II  

E-Print Network [OSTI]

We consider the Schr\\"odinger operator with a periodic potential on quasi-1D models of armchair single-wall nanotubes. The spectrum of this operator consists of an absolutely continuous part (intervals separated by gaps) plus an infinite number of eigenvalues with infinite multiplicity. We describe the absolutely continuous spectrum of the Schr\\"odinger operator: 1) the multiplicity, 2) endpoints of the gaps, they are given by periodic or antiperiodic eigenvalues or resonances (branch points of the Lyapunov function), 3) resonance gaps, where the Lyapunov function is non-real. We determine the asymptotics of the gaps at high energy.

Andrey Badanin; Jochen Brüning; Evgeny Korotyaev

2007-07-26T23:59:59.000Z

473

Angular dependence of coercivity in magnetic nanotubes  

E-Print Network [OSTI]

The nucleation field for infinite magnetic nanotubes, in the case of a magnetic field applied parallel to the long axis of the tubes, is calculated as a function of their geometric parameters and compared with those produced inside the pores of anodic alumina membranes by atomic layer deposition. We also extended this result to the case of an angular dependence. We observed a transition from curling-mode rotation to coherent-mode rotation as a function of the angle in which the external magnetic field is applied. Finally, we observed that the internal radii of the tubes favors the magnetization curling reversal.

J. Escrig; M. Daub; P. Landeros; K. Nielsch; D. Altbir

2007-10-30T23:59:59.000Z

474

Fibrous composites comprising carbon nanotubes and silica  

DOE Patents [OSTI]

Fibrous composite comprising a plurality of carbon nanotubes; and a silica-containing moiety having one of the structures: (SiO).sub.3Si--(CH.sub.2).sub.n--NR.sub.1R.sub.2) or (SiO).sub.3Si--(CH.sub.2).sub.n--NCO; where n is from 1 to 6, and R.sub.1 and R.sub.2 are each independently H, CH.sub.3, or C.sub.2H.sub.5.

Peng, Huisheng (Shanghai, CN); Zhu, Yuntian Theodore (Cary, NC); Peterson, Dean E. (Los Alamos, NM); Jia, Quanxi (Los Alamos, NM)

2011-10-11T23:59:59.000Z

475

Schrödinger operators on armchair nanotubes. I  

E-Print Network [OSTI]

We consider the Schr\\"odinger operator with a periodic potential on quasi-1D models of armchair single-wall nanotubes. The spectrum of this operator consists of an absolutely continuous part (intervals separated by gaps) plus an infinite number of eigenvalues with infinite multiplicity. We describe all eigenfunctions with the same eigenvalue. We define a Lyapunov function, which is analytic on some Riemann surface. On each sheet, the Lyapunov function has the same properties as in the scalar case, but it has branch points, which we call resonances. In example we show the existence of real and complex resonances for some specific potentials.

Andrey Badanin; Jochen Brüning; Evgeny Korotyaev; Igor Lobanov

2007-07-26T23:59:59.000Z

476

Structure and electronic properties of saturated and unsaturated gallium nitride nanotubes  

SciTech Connect (OSTI)

The atomic and electronic structures of saturated and unsaturated GaN nanotubes along the [001] direction with (100) lateral facets are studied using first-principles calculations. Atomic relaxation of nanotubes shows that appreciable distortion occurs in the unsaturated nanotubes. All the nanotubes considered, including saturated and unsaturated ones, exhibit semiconducting, with a direct band gap. Surface states arisen from the threefold-coordinated N and Ga atoms at the lateral facets exist inside the bulk-like band gap. When the nanotubes saturated with hydrogen, these dangling bond bands are removed from the band gap, but the band gap decreases with increasing the wall thickness of the nanotubes.

Wang, Zhiguo; Wang, Shengjie; Li, Jingbo; Gao, Fei; Weber, William J.

2009-11-05T23:59:59.000Z

477

Nanotube diameter optimal for channeling of high-energy particle beam  

E-Print Network [OSTI]

Channeling of particle beam in straight and bent single-wall nanotubes has been studied in computer simulations. We have found that the nanotubes should be sufficiently narrow in order to steer efficiently the particle beams, with preferred diameter in the order of 0.5-2 nm. Wider nanotubes, e.g. 10-50 nm, appear rather useless for channeling purpose because of high sensitivity of channeling to nanotube curvature. We have compared bent nanotubes with bent crystals as elements of beam steering technique, and found that narrow nanotubes have an efficiency of beam bending similar to that of crystals.

V. M. Biryukov; S. Bellucci

2002-06-04T23:59:59.000Z

478

Photoresponse from noble metal nanoparticles-multi walled carbon nanotube composites  

SciTech Connect (OSTI)

In this Letter, we investigated the photo-response of multi wall carbon nanotube-based composites obtained from in situ thermal evaporation of noble metals (Au, Ag, and Cu) on the nanotube films. The metal deposition process produced discrete nanoparticles on the nanotube outer walls. The nanoparticle-carbon nanotube films were characterized by photo-electrochemical measurements in a standard three electrode cell. The photocurrent from the decorated carbon nanotubes remarkably increased with respect to that of bare multiwall tubes. With the aid of first-principle calculations, these results are discussed in terms of metal nanoparticle-nanotube interactions and electronic charge transfer at the interface.

Scarselli, M.; Camilli, L.; Castrucci, P.; De Crescenzi, M. [Dipartimento di Fisica, Universita di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Roma (Italy); Matthes, L. [Dipartimento di Fisica, Universita di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Roma (Italy); Institut fuer Festkoepertheorie und optik, Friedrich Schiller Universitaet, Max-Wien Platz 1, Jena (Germany); Pulci, O. [Dipartimento di Fisica, Universita di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Roma (Italy); ETSF, MIFO, and CNR-ISM, Via del Fosso del Cavaliere, Roma (Italy); Gatto, E.; Venanzi, M. [Dipartimento di Scienze e Tecnologie Chimiche, Universita di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Roma (Italy)

2012-12-10T23:59:59.000Z

479

Thermal expansion of multiwall carbon nanotube reinforced nanocrystalline silver matrix composite  

SciTech Connect (OSTI)

Multiwall carbon nanotube reinforced silver matrix composite was fabricated by novel molecular level mixing method, which involves nucleation of Ag ions inside carbon nanotube dispersion at the molecular level. As a result the carbon nanotubes get embedded within the powder rather than on the surfaces. Micro structural characterization by X- ray diffraction and scanning electron microscopy reveals that the nanotubes are homogeneously dispersed and anchored within the matrix. The thermal expansion of the composite with the multiwall nanotube content (0, 1.5 vol%) were investigated and it is found that coefficient of thermal expansion decreases with the addition of multiwall nanotube content and reduce to about 63% to that of pure Ag.

Sharma, Manjula, E-mail: manjula.physics@gmail.com; Sharma, Vimal [Department of Physics, NIT Hamirpur - 177005, HP (India); Pal, Hemant [Department of Physics, NIT Hamirpur - 177005, HP, India and Department of Physics, Govt. College Chamba - 176310, HP (India)

2014-04-24T23:59:59.000Z

480

Computational modeling of thermal conductivity of single walled carbon nanotube polymer composites  

E-Print Network [OSTI]

to solid materials like metals. Keywords: SWNT, Random Walk, Thermal Conductivity, Composites 1 at the interface between the matrix material and the SWNT plays a very important role on the effective thermal conductivity. This thermal resistance is known as the Kapitza resistance [8]. According to the acoustic theory

Maruyama, Shigeo

Note: This page contains sample records for the topic "umbilicals polymer nanotube" from the National Library of EnergyBeta (NLEBeta).
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481

Wafer-Level Patterned and Aligned Polymer Nanowire/ Micro-and Nanotube Arrays on any Substrate  

E-Print Network [OSTI]

in an ICP reactive ion milling chamber with a pressure of 10 mTorr (1 Torr ÂĽ 133.3 Pa). Ar, O2, and CF4 ions.[25] Our system input gases included CF4, O2, and Ar. CF4 is commonly used as a chemical etchant

Wang, Zhong L.

482

Electrical, electromagnetic and structural characteristics of carbon nanotube-polymer nanocomposites  

E-Print Network [OSTI]

Composites for Electromagnetic Interference Shielding. NanoY. Ma, et al. Electromagnetic Interference (EMI) Shieldingof Bonn). Chung DDL. Electromagnetic interference shielding

Park, Sung-Hoon

2009-01-01T23:59:59.000Z

483

Electrical, electromagnetic and structural characteristics of carbon nanotube-polymer nanocomposites  

E-Print Network [OSTI]

composites mechanical, electrical and optical properties.Nanocomposites: Rheology and Electrical Conductivity.Weglikowska, Roth S. Electrical and mechanical properties of

Park, Sung-Hoon

2009-01-01T23:59:59.000Z

484

Three-dimensional constitutive relations of aligned carbon nanotube polymer nanocomposites  

E-Print Network [OSTI]

We have created a set of decision support tools to streamline the surgical case scheduling process by allowing surgical wait list cases (elective cases that cannot be assigned a slot on the operating room schedule at the ...

Handlin, Daniel A

2013-01-01T23:59:59.000Z

485

SUPER HARD SURFACED POLYMERS  

SciTech Connect (OSTI)

High energy ion beam surface treatments were applied to a selected group of polymers. Of the six materials in the present study, four were thermoplastics (polycarbonate, polyethylene, polyethylene terephthalate, and polystyrene) and two were thermosets (epoxy and polyimide). The particular epoxy evaluated in this work is one of the resins used in formulating fiber reinforced composites for military helicopter blades. Measures of mechanical properties of the near surface regions were obtained by nanoindentation hardness and pin on disk wear. Attempts were also made to measure erosion resistance by particle impact. All materials were hardness tested. Pristine materials were very soft, having values in the range of approximately 0.1 to 0.5 GPa. Ion beam treatment increased hardness by up to 50 times compared to untreated materials. For reference, all materials were hardened to values higher than those typical of stainless steels. Wear tests were carried out on three of the materials, PET, PI and epoxy. On the ion beam treated epoxy no wear could be detected, whereas the untreated material showed significant wear.

Mansur, Louis K [ORNL] [ORNL; Bhattacharya, R [UES, Incorporated, Dayton, OH] [UES, Incorporated, Dayton, OH; Blau, Peter Julian [ORNL] [ORNL; Clemons, Art [ORNL] [ORNL; Eberle, Cliff [ORNL] [ORNL; Evans, H B [UES, Incorporated, Dayton, OH] [UES, Incorporated, Dayton, OH; Janke, Christopher James [ORNL] [ORNL; Jolly, Brian C [ORNL] [ORNL; Lee, E H [Consultant, Milpitas, CA] [Consultant, Milpitas, CA; Leonard, Keith J [ORNL] [ORNL; Trejo, Rosa M [ORNL] [ORNL; Rivard, John D [ORNL] [ORNL

2010-01-01T23:59:59.000Z

486

Resonance-Stabilized Anion Exchange Polymer Electrolytes  

Broader source: Energy.gov (indexed) [DOE]

- 4OH - No precious metal catalyst is needed in AFC "Nitrogen-containing carbon nanotubes can act as a metal-free electrode with a much better electro-catalytic activity........

487

Super-high-frequency shielding properties of excimer-laser-synthesized-single-wall-carbon-nanotubes/polyurethane nanocomposite films  

SciTech Connect (OSTI)

Electromagnetic shielding attenuation (ESA) properties of carbon nanotubes/polymer nanocomposite films, in the super high frequency (SHF) X-band (7-12 GHz) domain are studied. The nanocomposite films consisted of thermoset polyurethane (PU) resin blended with single-walled carbon nanotubes (SWCNTs) mats, and deposited on fused quartz substrates. Two different approaches were used to achieve the nanocomposite films, namely (i) through the on-substrate ''all-laser'' growth approach of SWCNTs directly onto substrate, followed by their infiltration by the PU resin, and (ii) by appropriately dispersing the chemically-purified SWCNTs (in the soot form) into the PU matrix and their subsequent deposition onto quartz substrates by means of a solvent casting process. Characterizations of the ESA properties of the developed nanocomposite films show that they exhibit systematically a deep shielding band, centered at around 9.5 GHz, with an attenuation as high as |- 30| dB, recorded for SWCNT loads of 2.5 wt. % and above. A direct correlation is established between the electrical conductivity of the nanocomposite films and their electromagnetic shielding capacity. The SWCNTs/PU nanocomposites developed here are highly promising shielding materials as SHF notch filters, as their ESA capacity largely exceeds the target value of |- 20| dB generally requested for commercial applications.

Aiessa, B.; Habib, M. A.; Denidni, T. A.; El Khakani, M. A. [Institut National de la Recherche Scientifique, INRS-Energie, Materiaux et Telecommunications, 1650 Blvd. Lionel Boulet, C.P. 1020, Varennes, Quebec, J3X 1S2 (Canada); Laberge, L. L.; Therriault, D. [Mechanical Engineering Department, Ecole Polytechnique de Montreal, P.O. Box 6079, Montreal, H3C 3A7 (Canada)

2011-04-15T23:59:59.000Z

488

Symmetric space description of carbon nanotubes  

E-Print Network [OSTI]

Using an innovative technique arising from the theory of symmetric spaces, we obtain an approximate analytic solution of the Dorokhov-Mello-Pereyra-Kumar (DMPK) equation in the insulating regime of a metallic carbon nanotube with symplectic symmetry and an odd number of conducting channels. This symmetry class is characterized by the presence of a perfectly conducting channel in the limit of infinite length of the nanotube. The derivation of the DMPK equation for this system has recently been performed by Takane, who also obtained the average conductance both analytically and numerically. Using the Jacobian corresponding to the transformation to radial coordinates and the parameterization of the transfer matrix given by Takane, we identify the ensemble of transfer matrices as the symmetric space of negative curvature SO^*(4m+2)/[SU(2m+1)xU(1)] belonging to the DIII-odd Cartan class. We rederive the leading-order correction to the conductance of the perfectly conducting channel and its variance Var(log(delta g)). Our results are in complete agreement with Takane's. In addition, our approach based on the mapping to a symmetric space enables us to obtain new universal quantities: a universal group theoretical expression for the ratio Var(log(delta g)/ and as a byproduct, a novel expression for the localization length for the most general case of a symmetric space with BC_m root system, in which all three types of roots are present.

M. Caselle; U. Magnea

2006-01-10T23:59:59.000Z

489

Heterojunctions between metals and carbon nanotubes as ultimate nanocontacts  

Science Journals Connector (OSTI)

...solute-to-solvent) of ferrocene, Co acetylacetonate II, nickelocene, or a mixture of...carbon-nanopillar tubulization caused by liquidlike iron particles . Phys Rev Lett 92 : 215702...carbon nanotube growth from solid state iron carbide nanoparticles . Nano Lett 8...

Julio A. Rodríguez-Manzo; Florian Banhart; Mauricio Terrones; Humberto Terrones; Nicole Grobert; Pulickel M. Ajayan; Bobby G. Sumpter; Vincent Meunier; Mingsheng Wang; Yoshio Bando; Dmitri Golberg

2009-01-01T23:59:59.000Z

490

Design and modeling of carbon nanotube-based compliant mechanisms  

E-Print Network [OSTI]

The objective of this research is to generate the knowledge required to adapt macro- and microscale compliant mechanism theory to design carbon nanotube-based nano-scale compliant mechanisms. Molecular simulations of a ...

DiBiasio, Christopher M. (Christopher Michael)

2007-01-01T23:59:59.000Z

491

Scattering and absorption of ultracold atoms by nanotubes  

E-Print Network [OSTI]

We investigate theoretically how cold atoms, including Bose-Einstein condensates, are scattered from, or absorbed by nanotubes with a view to analysing recent experiments. In particular we consider the role of potential strength, quantum reflection, atomic interactions and tube vibrations on atom loss rates. Lifshitz theory calculations deliver a significantly stronger scattering potential than that found in experiment and we discuss possible reasons for this. We find that the scattering potential for dielectric tubes can be calculated to a good approximation using a modified pairwise summation approach, which is efficient and easily extendable to arbitrary geometries. Quantum reflection of atoms from a nanotube may become a significant factor at low temperatures, especially for non-metallic tubes. Interatomic interactions are shown to increase the rate at which atoms are lost to the nanotube and lead to non-trivial dynamics. Thermal nanotube vibrations do not significantly increase loss rates or reduce condensate fractions, but lower frequency oscillations can dramatically heat the cloud.

B. Jetter; J. Märkle; P. Schneeweiss; M. Gierling; S. Scheel; A. Günther; J. Fortágh; T. E. Judd

2012-05-28T23:59:59.000Z

492

Magneto-optical spectroscopy of metallic carbon nanotubes.  

E-Print Network [OSTI]

??Through polarization-dependent magneto-optical absorption spectroscopy, the magnetic susceptibility anisotropy for metallic single-walled carbon nanotubes has been extracted and found to be up to 4x greater… (more)

Searles, Thomas A., Jr

2010-01-01T23:59:59.000Z

493

Template-based Ferromagnetic Nanowires and Nanotubes: Fabrication and Characterization  

E-Print Network [OSTI]

This dissertation describes experimental studies of the structures and properties, and their correlations in ferromagnetic nanowires and nanotubes fabricated using porous templates. Ferromagnetic Ni and Fe nanowires with diameters 30 ~ 250 nm were...

Wei, Zhiyuan

2013-05-01T23:59:59.000Z

494

Hydrophobic silica aerogel reinforced with carbon nanotube for oils removal  

Science Journals Connector (OSTI)

Hydrophobic silica aerogel reinforced with carbon nanotube (CNT/silica aerogel) has been prepared by forming silica layer on carboxylated CNT via a sol–gel process. The prepared CNT/silica aerogel can bear a l...

Tao Sun; Qin Zhuo; Xin Liu; Zhaopeng Sun; Zhanjun Wu…

2014-08-01T23:59:59.000Z

495

Irradiation Stability of Carbon Nanotubes and Related Materials  

E-Print Network [OSTI]

defect annealing at elevated irradiation temperatures, which delays the formation of amorphous regions. Investigation of nanotube stability after various processing techniques and irradiation indicated that radiation response of CNTs in a composite...

Aitkaliyeva, Assel 1985-

2012-09-28T23:59:59.000Z

496

Minimum Exergy Requirements for the Manufacturing of Carbon Nanotubes  

E-Print Network [OSTI]

The purpose of this paper is to address both the high values, and the large variation in reported values for the energy requirements for the production of carbon nanotubes. The paper includes an estimate of the standard ...

Gutowski, Timothy G.

497

Optical studies of DNA-wrapped carbon nanotubes  

E-Print Network [OSTI]

This thesis presents a series of detailed optical studies of phonon-assisted relaxation processes in DNA-wrapped single walled carbon nanotubes. Using resonance Raman spectroscopy (RRS) and photoluminescence spectroscopy ...

Chou, Shin Grace

2006-01-01T23:59:59.000Z

498

Modeling Carbon Nanotubes in Injection Molding | ornl.gov  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Modeling Carbon Nanotubes in Injection Molding Feb 03 2015 11:00 AM - 11:30 AM Lukas Bystricky, Florida State University Computer Science and Mathematics Division Computational and...

499

Work functions of functionalized singled-walled carbon nanotubes  

E-Print Network [OSTI]

Introduction: Carbon nanotube (CNT) structures were discovered by Sumio Iijima in 1991 at NEC laboratories in Japan. Since their discovery, scientists and engineers have been fascinated by their electrical and mechanical ...

Ryu, Janet. (Janet Sun)

2006-01-01T23:59:59.000Z

500

Superconductivity in Bundles of Double-Wall Carbon Nanotubes  

E-Print Network [OSTI]

We present electrical and thermal specific heat measurements that show superconductivity in double-wall carbon nanotube (DWCNT) bundles. Clear evidence, comprising a resistance drop as a function of temperature, magnetoresistance ...

Shi, Wu