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Note: This page contains sample records for the topic "metallic copper nanoparticles" 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

Formation of Metallic Copper Nanoparticles at the Soil-Root Interface  

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

Formation of Metallic Copper Formation of Metallic Copper Nanoparticles at the Soil-Root Interface Formation of Metallic Copper Nanoparticles at the Soil-Root Interface Print Wednesday, 26 March 2008 00:00 The first commercial fungicide-the "Bordeaux mixture" of copper sulfate and lime-was used to fight downy mildew in French vineyards. The fungicide worked by catalyzing the production of free radicals that damage proteins and enzymes involved in cycling copper between Cu(I) and Cu(II) oxidation states in the cellular electron transport chain. However, not all fungi are sensitive to copper toxicity. Some, called mycorrhizae, which live underground in symbiosis with host plants through intracellular or extracellular colonization of their roots, are resistant, although it is not known why. A team from the CNRS and Université Joseph Fourier in Grenoble in collaboration with researchers at the University of Illinois at Chicago and in partnership with the French company Phytorestore has discovered a new form of copper-metallic nanoparticles-in the rhizosphere (soil-root interface) that may explain how mycorrhizal (symbiotic) fungi detoxify copper.

2

Formation of Metallic Copper Nanoparticles at the Soil-Root Interface  

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

Formation of Metallic Copper Nanoparticles at the Soil-Root Interface Print Formation of Metallic Copper Nanoparticles at the Soil-Root Interface Print The first commercial fungicide-the "Bordeaux mixture" of copper sulfate and lime-was used to fight downy mildew in French vineyards. The fungicide worked by catalyzing the production of free radicals that damage proteins and enzymes involved in cycling copper between Cu(I) and Cu(II) oxidation states in the cellular electron transport chain. However, not all fungi are sensitive to copper toxicity. Some, called mycorrhizae, which live underground in symbiosis with host plants through intracellular or extracellular colonization of their roots, are resistant, although it is not known why. A team from the CNRS and Université Joseph Fourier in Grenoble in collaboration with researchers at the University of Illinois at Chicago and in partnership with the French company Phytorestore has discovered a new form of copper-metallic nanoparticles-in the rhizosphere (soil-root interface) that may explain how mycorrhizal (symbiotic) fungi detoxify copper.

3

Formation of Metallic Copper Nanoparticles at the Soil-Root Interface  

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

Formation of Metallic Copper Nanoparticles at the Soil-Root Interface Print Formation of Metallic Copper Nanoparticles at the Soil-Root Interface Print The first commercial fungicide-the "Bordeaux mixture" of copper sulfate and lime-was used to fight downy mildew in French vineyards. The fungicide worked by catalyzing the production of free radicals that damage proteins and enzymes involved in cycling copper between Cu(I) and Cu(II) oxidation states in the cellular electron transport chain. However, not all fungi are sensitive to copper toxicity. Some, called mycorrhizae, which live underground in symbiosis with host plants through intracellular or extracellular colonization of their roots, are resistant, although it is not known why. A team from the CNRS and Université Joseph Fourier in Grenoble in collaboration with researchers at the University of Illinois at Chicago and in partnership with the French company Phytorestore has discovered a new form of copper-metallic nanoparticles-in the rhizosphere (soil-root interface) that may explain how mycorrhizal (symbiotic) fungi detoxify copper.

4

Formation of Metallic Copper Nanoparticles at the Soil-Root Interface  

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

Formation of Metallic Copper Nanoparticles at the Soil-Root Interface Print Formation of Metallic Copper Nanoparticles at the Soil-Root Interface Print The first commercial fungicide-the "Bordeaux mixture" of copper sulfate and lime-was used to fight downy mildew in French vineyards. The fungicide worked by catalyzing the production of free radicals that damage proteins and enzymes involved in cycling copper between Cu(I) and Cu(II) oxidation states in the cellular electron transport chain. However, not all fungi are sensitive to copper toxicity. Some, called mycorrhizae, which live underground in symbiosis with host plants through intracellular or extracellular colonization of their roots, are resistant, although it is not known why. A team from the CNRS and Université Joseph Fourier in Grenoble in collaboration with researchers at the University of Illinois at Chicago and in partnership with the French company Phytorestore has discovered a new form of copper-metallic nanoparticles-in the rhizosphere (soil-root interface) that may explain how mycorrhizal (symbiotic) fungi detoxify copper.

5

Formation of Metallic Copper Nanoparticles at the Soil-Root Interface  

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

Formation of Metallic Copper Nanoparticles at the Soil-Root Interface Print Formation of Metallic Copper Nanoparticles at the Soil-Root Interface Print The first commercial fungicide-the "Bordeaux mixture" of copper sulfate and lime-was used to fight downy mildew in French vineyards. The fungicide worked by catalyzing the production of free radicals that damage proteins and enzymes involved in cycling copper between Cu(I) and Cu(II) oxidation states in the cellular electron transport chain. However, not all fungi are sensitive to copper toxicity. Some, called mycorrhizae, which live underground in symbiosis with host plants through intracellular or extracellular colonization of their roots, are resistant, although it is not known why. A team from the CNRS and Université Joseph Fourier in Grenoble in collaboration with researchers at the University of Illinois at Chicago and in partnership with the French company Phytorestore has discovered a new form of copper-metallic nanoparticles-in the rhizosphere (soil-root interface) that may explain how mycorrhizal (symbiotic) fungi detoxify copper.

6

Inkjet printed electronics using copper nanoparticle ink  

E-Print Network (OSTI)

electronics using copper nanoparticle ink Jin Sung Kang of electrode using copper nanoparticle ink is presented.of drop on demand copper nanoparticle inkjet printer system,

Kang, Jin Sung; Kim, Hak Sung; Ryu, Jongeun; Thomas Hahn, H.; Jang, Seonhee; Joung, Jae Woo

2010-01-01T23:59:59.000Z

7

Effects of metallic nanoparticle doped flux on the interfacial intermetallic compounds between lead-free solder ball and copper substrate  

Science Journals Connector (OSTI)

Abstract Lead free solders currently in use are prone to develop thick interfacial intermetallic compound layers with rough morphology which are detrimental to the long term solder joint reliability. A novel method has been developed to control the morphology and growth of intermetallic compound layers between lead-free Sn3.0Ag0.5Cu solder ball and copper substrate by doping a water soluble flux with metallic nanoparticles. Four types of metallic nanoparticles (nickel, cobalt, molybdenum and titanium) were used to investigate their effects on the wetting behavior and interfacial microstructural evaluations after reflow. Nanoparticles were dispersed manually with a water soluble flux and the resulting nanoparticle doped flux was placed on copper substrate. Lead-free Sn3.0Ag0.5Cu solder balls of diameter 0.45mm were placed on top of the flux and were reflowed at a peak temperature of 240C for 45s. Angle of contact, wetting area and interfacial microstructure were studied by optical microscopy, field emission scanning electron microscopy and energy-dispersive X-ray spectroscopy. It was observed that the angle of contact increased and wetting area decreased with the addition of cobalt, molybdenum and titanium nanoparticles to flux. On the other hand, wettability improved with the addition of nickel nanoparticles. Cross-sectional micrographs revealed that both nickel and cobalt nanoparticle doping transformed the morphology of Cu6Sn5 from a typical scallop type to a planer one and reduced the intermetallic compound thickness under optimum condition. These effects were suggested to be related to in-situ interfacial alloying at the interface during reflow. The minimum amount of nanoparticles required to produce the planer morphology was found to be 0.1wt.% for both nickel and cobalt. Molybdenum and titanium nanoparticles neither appear to undergo alloying during reflow nor have any influence at the solder/substrate interfacial reaction. Thus, doping of flux with appropriate metallic nanoparticles can be successfully used to control the morphology and growth of intermetallic compound layers at the solder/substrate interface which is expected to lead to better reliability of electronic devices.

G.K. Sujan; A.S.M.A. Haseeb; A.B.M. Afifi

2014-01-01T23:59:59.000Z

8

Stabilization of Electrocatalytic Metal Nanoparticles at Metal...  

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

Electrocatalytic Metal Nanoparticles at Metal-Metal Oxide-Graphene Triple Junction Points. Stabilization of Electrocatalytic Metal Nanoparticles at Metal-Metal Oxide-Graphene...

9

Nanoparticle plasma ejected directly from solid copper by localized microwaves  

SciTech Connect

A plasma column ejected directly from solid copper by localized microwaves is studied. The effect stems from an induced hotspot that melts and emits ionized copper vapors as a confined fire column. Nanoparticles of {approx}20-120 nm size were revealed in the ejected column by in situ small-angle x-ray scattering. Optical spectroscopy confirmed the dominance of copper particles in the plasma column originating directly from the copper substrate. Nano- and macroparticles of copper were verified also by ex situ scanning electron microscopy. The direct conversion of solid metals to nanoparticles is demonstrated and various applications are proposed.

Jerby, E.; Golts, A.; Shamir, Y.; Wonde, S.; Ashkenazi, D.; Eliaz, N. [Faculty of Engineering, Tel Aviv University, Ramat Aviv 69978 (Israel); Mitchell, J. B. A.; LeGarrec, J. L. [IPR., U.M.R. No. 6251 du C.N.R.S., Universite de Rennes I, 35042 Rennes (France); Narayanan, T.; Sztucki, M. [European Synchrotron Radiation Facility, BP-220, 38043 Grenoble (France); Barkay, Z. [Wolfson Applied Materials Research Center, Tel Aviv University, Ramat-Aviv 69978 (Israel)

2009-11-09T23:59:59.000Z

10

Divalent metal nanoparticles  

E-Print Network (OSTI)

Metal nanoparticles hold promise for many scientific and technological applications, such as chemical and biological sensors, vehicles for drug delivery, and subdiffraction limit waveguides. To fabricate such devices, a ...

DeVries, Gretchen Anne

2008-01-01T23:59:59.000Z

11

Apoferritin Templated Synthesis of Metal Phosphate Nanoparticle...  

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

Apoferritin Templated Synthesis of Metal Phosphate Nanoparticle Labels for Electrochemical Immunoassay. Apoferritin Templated Synthesis of Metal Phosphate Nanoparticle Labels for...

12

Inert electrode containing metal oxides, copper and noble metal  

DOE Patents (OSTI)

A cermet composite material is made by treating at an elevated temperature a mixture comprising a compound of iron and a compound of at least one other metal, together with an alloy or mixture of copper and a noble metal. The alloy or mixture preferably comprises particles having an interior portion containing more copper than noble metal and an exterior portion containing more noble metal than copper. The noble metal is preferably silver. The cermet composite material preferably includes alloy phase portions and a ceramic phase portion. At least part of the ceramic phase portion preferably has a spinel structure.

Ray, Siba P. (Murrysville, PA); Woods, Robert W. (New Kensington, PA); Dawless, Robert K. (Monroeville, PA); Hosler, Robert B. (Sarver, PA)

2001-01-01T23:59:59.000Z

13

Inert electrode containing metal oxides, copper and noble metal  

DOE Patents (OSTI)

A cermet composite material is made by treating at an elevated temperature a mixture comprising a compound of iron and a compound of at least one other metal, together with an alloy or mixture of copper and a noble metal. The alloy or mixture preferably comprises particles having an interior portion containing more copper than noble metal and an exterior portion containing more noble metal than copper. The noble metal is preferably silver. The cermet composite material preferably includes alloy phase portions and a ceramic phase portion. At least part of the ceramic phase portion preferably has a spinel structure.

Ray, Siba P. (Murrysville, PA); Woods, Robert W. (New Kensington, PA); Dawless, Robert K. (Monroeville, PA); Hosler, Robert B. (Sarver, PA)

2000-01-01T23:59:59.000Z

14

Engineering embedded metal nanoparticles with ion beam technology  

E-Print Network (OSTI)

2002) Engineering embedded metal nanoparticles with ion beam3 Engineering embedded metal nanoparticles with ion beamcompara- Engineering embedded metal nanoparticles with ion

Ren, Feng; Xiao, Xiang Heng; Cai, Guang Xu; Wang, Jian Bo; Jiang, Chang Zhong

2009-01-01T23:59:59.000Z

15

Electron Dynamics in Metallic Nanoparticles M. Aeschlimann  

E-Print Network (OSTI)

nanoparticles are discussed in the light of the results of line width measurements and femtosecond pump...............................................................................................................3 II. ADSORPTION OF LIGHT IN METALLIC NANOPARTICLES...................................4 A. General...............................................18 C. Heat transfer between the nanoparticles and the support

Bauer, Michael

16

Studies of Copper Nanoparticles Effects on Micro-organisms  

E-Print Network (OSTI)

We discuss about the antibacterial activities of copper nanoparticles on both Gram negative and Gram positive bacteria in this investigation. First time, we increase its antibacterial activities by using electrical power while on electrolysis synthesis and it is confirmed from its more antibacterial activities (For Escherichia coli bacteria). We investigate the changes of surface area to volume ratio of copper nanoparticles prepared in two different methods and its effects on antibacterial activities. We note that slight change of surface area to volume ratio results in the enhancement of its antibacterial activities.

T. Theivasanthi; M. Alagar

2011-10-05T23:59:59.000Z

17

An investigation of bulk nanocrystalline copper fabricated via severe plastic deformation and nanoparticle consolidation  

E-Print Network (OSTI)

obtained respectively by a top down approach of severe plastic deformation of wrought copper and a bottom up approach of consolidation of copper nanoparticles using equal channel angular extrusion (ECAE). A critical assessment and correlation...

Haouaoui, Mohammed

2007-04-25T23:59:59.000Z

18

METAL NANOPARTICLES FUNCTIONALIZED WITH METAL-LIGAND COVALENT BONDS  

E-Print Network (OSTI)

fundamental and technological perspectives, largely because these nanomaterials show unique optical and electronicelectronic energy structures, which may serve as a fundamentaland electronic characteristics, the metal nanoparticles have been attracting extensive interest in the field of fundamental

Kang, Xiongwu

2012-01-01T23:59:59.000Z

19

Modeling Fossil Energy Demands of Primary Nonferrous Metal Production: The Case of Copper  

Science Journals Connector (OSTI)

Modeling Fossil Energy Demands of Primary Nonferrous Metal Production: The Case of Copper ... Alumbrera (Argentina) ...

Pilar Swart; Jo Dewulf

2013-11-22T23:59:59.000Z

20

Incorporation of copper nanoparticles into paper for point-of-use water purification  

Science Journals Connector (OSTI)

Abstract As a cost-effective alternative to silver nanoparticles, we have investigated the use of copper nanoparticles in paper filters for point-of-use water purification. This work reports an environmentally benign method for the direct in situ preparation of copper nanoparticles (CuNPs) in paper by reducing sorbed copper ions with ascorbic acid. Copper nanoparticles were quickly formed in less than 10min and were well distributed on the paper fiber surfaces. Paper sheets were characterized by x-ray diffraction, scanning electron microscopy, energy dispersive x-ray spectroscopy, and atomic absorption spectroscopy. Antibacterial activity of the CuNP sheets was assessed for by passing Escherichia coli bacteria suspensions through the papers. The effluent was analyzed for viable bacteria and copper release. The CuNP papers with higher copper content showed a high bacteria reduction of log 8.8 for E. coli. The paper sheets containing copper nanoparticles were effective in inactivating the test bacteria as they passed through the paper. The copper levels released in the effluent water were below the recommended limit for copper in drinking water (1ppm).

Theresa A. Dankovich; James A. Smith

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "metallic copper nanoparticles" 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

Gold Nanoparticle-Based Sensing of "Spectroscopically Silent" Heavy Metal  

E-Print Network (OSTI)

of aqueous heavy metal ions, including toxic metals such as lead, cadmium, and mercury, is describedLetters Gold Nanoparticle-Based Sensing of "Spectroscopically Silent" Heavy Metal Ions Youngjin Kim that by functionalizing metal nanoparticles with appropriate heavy-metal ion receptors, the particles might be coaxed

22

Method for extracting copper, silver and related metals  

DOE Patents (OSTI)

A process for selectively extracting precious metals such as silver and gold concurrent with copper extraction from aqueous solutions containing the same. The process utilizes tetrathiamacrocycles and high molecular weight organic acids that exhibit a synergistic relationship when complexing with certain metal ions thereby removing them from ore leach solutions.

Moyer, B.A.; McDowell, W.J.

1987-10-23T23:59:59.000Z

23

Gold, Copper, and Platinum Nanoparticles Dispersed on CeOx/TiO2(110) Surfaces: High Water-Gas Shift Activity and the Nature of the Mixed-Metal Oxide at the Nanometer Level  

SciTech Connect

At small coverages of ceria on TiO{sub 2}(110), the CeO{sub x} nanoparticles have an unusual coordination mode. Scanning tunneling microscopy and density-functional calculations point to the presence of Ce{sub 2}O{sub 3} dimers, which form diagonal arrays that have specific orientations of 0, 24, and 42{sup o} with respect to the [1 -1 0] direction of the titania substrate. At high coverages of ceria on TiO{sub 2}(110), the surface exhibits two types of terraces. In one type, the morphology is not very different from that observed at low ceria coverage. However, in the second type of terrace, there is a compact array of ceria particles with structures that do not match the structures of CeO{sub 2}(111) or CeO{sub 2}(110). The titania substrate imposes on the ceria nanoparticles nontypical coordination modes, enhancing their chemical reactivity. This phenomenon leads to a larger dispersion of supported metal nanoparticles (M = Au, Cu, Pt) and makes possible the direct participation of the oxide in catalytic reactions. The M/CeO{sub x}/TiO{sub 2}(110) surfaces display an extremely high catalytic activity for the water-gas shift reaction that follows the sequence Au/CeO{sub x}/TiO{sub 2}(110) < Cu/CeO{sub x}/TiO{sub 2}(110) < Pt/CeO{sub x}/TiO{sub 2}(110). For low coverages of Cu and CeO{sub x}, Cu/CeO{sub x}/TiO{sub 2}(110) is 8-12 times more active than Cu(111) or Cu/ZnO industrial catalysts. In the M/CeO{sub x}/TiO{sub 2}(110) systems, there is a strong coupling of the chemical properties of the admetal and the mixed-metal oxide: The adsorption and dissociation of water probably take place on the oxide, CO adsorbs on the admetal nanoparticles, and all subsequent reaction steps occur at the oxide-admetal interface. The high catalytic activity of the M/CeO{sub x}/TiO{sub 2}(110) surfaces reflects the unique properties of the mixed-metal oxide at the nanometer level.

Park, J.; Graciani, J; Evans, J; Stacchiola, D; Senanayake, S; Barrio, L; Liu, P; Fdez. Sanz, J; Hrbek, J; Rodriguez, J

2010-01-01T23:59:59.000Z

24

Gold, Copper and Platinum Nanoparticles Dispersed on CeOx/TiO2(110) Surfaces: High Water-Gas Shift Activity and the Nature of the Mixed-Metal Oxide at the Nanometer Level  

SciTech Connect

At small coverages of ceria on TiO{sub 2}(110), the CeO{sub x} nanoparticles have an unusual coordination mode. Scanning tunneling microscopy and density-functional calculations point to the presence of Ce{sub 2}O{sub 3} dimers, which form diagonal arrays that have specific orientations of 0, 24, and 42{sup o} with respect to the [1 -1 0] direction of the titania substrate. At high coverages of ceria on TiO{sub 2}(110), the surface exhibits two types of terraces. In one type, the morphology is not very different from that observed at low ceria coverage. However, in the second type of terrace, there is a compact array of ceria particles with structures that do not match the structures of CeO{sub 2}(111) or CeO{sub 2}(110). The titania substrate imposes on the ceria nanoparticles nontypical coordination modes, enhancing their chemical reactivity. This phenomenon leads to a larger dispersion of supported metal nanoparticles (M = Au, Cu, Pt) and makes possible the direct participation of the oxide in catalytic reactions. The M/CeO{sub x}/TiO{sub 2}(110) surfaces display an extremely high catalytic activity for the water-gas shift reaction that follows the sequence Au/CeO{sub x}/TiO{sub 2}(110) < Cu/CeO{sub x}/TiO{sub 2}(110) < Pt/CeO{sub x}/TiO{sub 2}(110). For low coverages of Cu and CeO{sub x}, Cu/CeO{sub x}/TiO{sub 2}(110) is 8-12 times more active than Cu(111) or Cu/ZnO industrial catalysts. In the M/CeO{sub x}/TiO{sub 2}(110) systems, there is a strong coupling of the chemical properties of the admetal and the mixed-metal oxide: The adsorption and dissociation of water probably take place on the oxide, CO adsorbs on the admetal nanoparticles, and all subsequent reaction steps occur at the oxide-admetal interface. The high catalytic activity of the M/CeO{sub x}/TiO{sub 2}(110) surfaces reflects the unique properties of the mixed-metal oxide at the nanometer level.

Rodriguez, J.A.; Park, J.B.; Graciani, J.; Evans, J.; Stacchiola, D.; Senanayake, S.D.; Barrio, L.; Liu, P.; Sanz, J.F.; Hrbek, J.

2010-01-13T23:59:59.000Z

25

Monodisperse metal nanoparticle catalysts on silica mesoporous supports: synthesis, characterizations, and catalytic reactions  

E-Print Network (OSTI)

capillary inclusion (CI) and nanoparticle encapsulation (NE)metal nanostructures, and to collidal nanoparticle- based 2Dand 3D nanoparticle arrays. Figure 2. Preparation scheme of

Somorjai, G.A.

2010-01-01T23:59:59.000Z

26

Copper has proven to be a metal of great benefit to people throughout history.  

E-Print Network (OSTI)

Copper has proven to be a metal of great benefit to people throughout history. Copper has been molded into many instru- ments such as pots, weapons and jewelry. In recent history, copper and its alloys have been fashioned into plumbing pipes and fixtures. Although these applications of copper

27

Heteroepitaxial Self Assembling Noble Metal Nanoparticles in Monocrystalline Silicon  

E-Print Network (OSTI)

and investigate fundamental properties. Noble metal nanoparticles made of gold or silver are grown in cavities in monocrystalline silicon formed by helium ion implantation and high temperature annealing at depth greater than 500 nm from the surface. Metals...

Martin, Michael S.

2013-08-13T23:59:59.000Z

28

Copper-induced oxidative stress in three-spined stickleback : relationship with hepatic metal levels  

E-Print Network (OSTI)

contamination of aquatic ecosystems by heavy metals. Among them, copper is a widespread pollutant found, 1999). Although this metal is a required element, high concentrations appear to be toxic to freshwater1 Copper-induced oxidative stress in three-spined stickleback : relationship with hepatic metal

Paris-Sud XI, Université de

29

Process for removing copper in a recoverable form from solid scrap metal  

DOE Patents (OSTI)

A process for removing copper in a recoverable form from a copper/solid ferrous scrap metal mix is disclosed. The process begins by placing a copper/solid ferrous scrap metal mix into a reactor vessel. The atmosphere within the reactor vessel is purged with an inert gas or oxidizing while the reactor vessel is heated in the area of the copper/solid ferrous scrap metal mix to raise the temperature within the reactor vessel to a selected elevated temperature. Air is introduced into the reactor vessel and thereafter hydrogen chloride is introduced into the reactor vessel to obtain a desired air-hydrogen chloride mix. The air-hydrogen chloride mix is operable to form an oxidizing and chloridizing atmosphere which provides a protective oxide coating on the surface of the solid ferrous scrap metal in the mix and simultaneously oxidizes/chloridizes the copper in the mix to convert the copper to a copper monochloride gas for transport away from the solid ferrous scrap metal. After the copper is completely removed from the copper/solid ferrous scrap metal mix, the flows of air and hydrogen chloride are stopped and the copper monochloride gas is collected for conversion to a recoverable copper species.

Hartman, Alan D. (Albany, OR); Oden, Laurance L. (Albany, OR); White, Jack C. (Albany, OR)

1995-01-01T23:59:59.000Z

30

A mixed-valence copper coordination polymer generated by hydrothermal metal/ligand redox reactions  

E-Print Network (OSTI)

A mixed-valence copper coordination polymer generated by hydrothermal metal/ligand redox reactions A novel coordination polymer of mixed-valence copper(I,II) with 4,4A-bipyridine and in situ oxidized and crystallographically char- acterized to be a laminated structure via weak copper(II)­ oxygen interactions. Extended

Li, Jing

31

Mitochondrial matrix copper complex used in metallation of cytochrome oxidase and superoxide dismutase  

E-Print Network (OSTI)

1 Mitochondrial matrix copper complex used in metallation of cytochrome oxidase and superoxide title: Mitochondrial copper transport * Address correspondence to: Dennis Winge, University of Utah.winge@hsc.utah.edu A mitochondrial matrix copper ligand (CuL) complex, conserved in mammalian cells, is shown for the first time

Paris-Sud XI, Université de

32

Route to transition metal carbide nanoparticles through cyanamide and metal oxides  

SciTech Connect

We have designed an efficient route to the synthesis of transition metal carbide nanoparticles starting from an organic reagent cyanamide and transition metal oxides. Four technologically important metal carbide nanoparticles such as tungsten carbide, niobium carbide, tantalum carbide and vanadium carbide were synthesized successfully at moderate temperatures. It is found that cyanamide is an efficient carburization reagent and that the metal oxides are completely transmitted into the corresponding carbide nanoparticles. A possible mechanism is proposed to explain the results of the reaction between cyanamide and the metal oxides.

Li, P.G. [Department of Physics, Center for Optoelectronics Materials and Devices, Zhejiang Sci-Tech University, Xiasha College Park, Hangzhou 310018 (China)], E-mail: peigangiphy@yahoo.com.cn; Lei, M.; Tang, W.H. [Department of Physics, Center for Optoelectronics Materials and Devices, Zhejiang Sci-Tech University, Xiasha College Park, Hangzhou 310018 (China)

2008-12-01T23:59:59.000Z

33

Engineering embedded metal nanoparticles with ion beam technology  

Science Journals Connector (OSTI)

In this paper, we summarize our recent results of study on how to engineer the embedded metal nanoparticles in silica by ion implantation and ion irradiation technologies, including controlling the size,...

Feng Ren; Xiang Heng Xiao; Guang Xu Cai; Jian Bo Wang

2009-08-01T23:59:59.000Z

34

Metallic-nanoparticle assisted enhanced band-to-band tunneling current Deblina Sarkara)  

E-Print Network (OSTI)

Metallic-nanoparticle assisted enhanced band-to-band tunneling current Deblina Sarkara) and Kaustav) Metallic nanoparticle assisted band-to-band tunneling is proposed, and the impact of such nanoparticle that an asymmetric pinning is required to leverage maximum benefits from the insertion of metallic nanoparticles. VC

35

Surface Functionalization of Thin-Film Composite Membranes with Copper Nanoparticles for Antimicrobial Surface Properties  

Science Journals Connector (OSTI)

Copper is one such alternative, having a long history (>2400 years) as an effective biocide,(26) and both copper ions and nanoparticles (Cu-NPs) have demonstrated antibacterial activity against numerous bacterial strains. ... The MDMH-modified membranes were shown to possess high chlorine resistances with small changes in water fluxes and salt rejections after chlorination with 100-2000 ppm h chlorine at pH 4. The chlorinated MDMH-modified membranes demonstrated obvious sterilization effects on Escherchia coli and substantial preventions against microbial fouling. ...

Moshe Ben-Sasson; Katherine R. Zodrow; Qi Genggeng; Yan Kang; Emmanuel P. Giannelis; Menachem Elimelech

2013-12-05T23:59:59.000Z

36

Metallic nanoparticle on micro ring resonator for bio optical detection and sensing  

Science Journals Connector (OSTI)

We have numerically investigated the unique effects of metallic nanoparticle on the ring resonator, especially multiple Au nanoparticles on the micro ring resonator with the 4-port...

Haddadpour, Ali; Yi, Yasha

2010-01-01T23:59:59.000Z

37

Collective spontaneous emission of two atoms near metal nanoparticle  

E-Print Network (OSTI)

We present quantum-mechanical approach for collective spontaneous emission (superradiance) of emitters (as atoms) near metal nanoparticle, when frequencies of transitions of emitters coincide with frequency of localized plasmon resonance of the nanoparticle. Our approach is based on Schrodinger description and it uses wave functions of states of systems. Interactions between emitters and between the nanoparticle and emitters are taken into account. We consider an example of two emitters and show that radiation is occurred through symmetric states of emitters as it is in Dicke model of superradiance. The nanoparticle accelerates collective spontaneous emission similar how it accelerates spontaneous emission of single emitter. Radiation from two emitters near the nanoparticle is faster than the radiation from two separated and non-interacted "nanoparticle+single emitter" systems. Efficiency of superradiance, i.e. the ratio of emitted photons to total number initial excitations in the system, is smaller than 1 d...

Protsenko, Igor

2014-01-01T23:59:59.000Z

38

Nanoparticle assembly via the dewetting of patterned thin metal lines: Understanding the instability mechanisms  

E-Print Network (OSTI)

Nanoparticle assembly via the dewetting of patterned thin metal lines: Understanding correlated nanoparticles from lithographically patterned pseudo-one-dimensional nickel lines. The evolution of the nickel line instabilities and nanoparticle formation with a correlated size and spacing was observed

Kondic, Lou

39

Modeling of pattern dependencies in the fabrication of multilevel copper metallization  

E-Print Network (OSTI)

Multilevel copper metallization for Ultra-Large-Scale-Integrated (ULSI) circuits is a critical technology needed to meet performance requirements for advanced interconnect technologies with sub-micron dimensions. It is ...

Cai, Hong, Ph. D. Massachusetts Institute of Technology

2007-01-01T23:59:59.000Z

40

Thermal contact conductance of metallic coated superconductor/copper interfaces at cryogenic temperatures  

E-Print Network (OSTI)

THERMAL CONTACT CONDUCTANCE OF METALLIC COATED SUPERCONDUCTOR/COPPER INTERFACES AT CRYOGENIC TEMPERATURES A Thesis by JAY MATTHEW OCHTERBECK Submitted to the 0%ce of Graduate Studies of Texas AJrM IJniversity in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE August 1990 Major Subject: Mechanical Engineering THERMAL CONTACT CONDUCTANCE OF METALLIC COATED SUPERCONDUCTOR/COPPER INTERFACES AT CRYOGENIC TEMPERATURES A Thesis JA'r '(IATTHEW OCHTERBECK Approved...

Ochterbeck, Jay Matthew

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "metallic copper nanoparticles" 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

Selective Electrocatalytic Activity of Ligand Stabilized Copper Oxide Nanoparticles  

SciTech Connect

Ligand stabilization can influence the surface chemistry of Cu oxide nanoparticles (NPs) and provide unique product distributions for electrocatalytic methanol (MeOH) oxidation and CO{sub 2} reduction reactions. Oleic acid (OA) stabilized Cu{sub 2}O and CuO NPs promote the MeOH oxidation reaction with 88% and 99.97% selective HCOH formation, respectively. Alternatively, CO{sub 2} is the only reaction product detected for bulk Cu oxides and Cu oxide NPs with no ligands or weakly interacting ligands. We also demonstrate that OA stabilized Cu oxide NPs can reduce CO{sub 2} into CO with a {approx}1.7-fold increase in CO/H{sub 2} production ratios compared to bulk Cu oxides. The OA stabilized Cu oxide NPs also show 7.6 and 9.1-fold increases in CO/H{sub 2} production ratios compared to weakly stabilized and non-stabilized Cu oxide NPs, respectively. Our data illustrates that the presence and type of surface ligand can substantially influence the catalytic product selectivity of Cu oxide NPs.

Kauffman, Douglas R.; Ohodnicki, Paul R.; Kail, Brian W; Matranga, Christopher

2011-01-01T23:59:59.000Z

42

Low resistance barrier layer for isolating, adhering, and passivating copper metal in semiconductor fabrication  

SciTech Connect

Cubic or metastable cubic refractory metal carbides act as barrier layers to isolate, adhere, and passivate copper in semiconductor fabrication. One or more barrier layers of the metal carbide are deposited in conjunction with copper metallizations to form a multilayer characterized by a cubic crystal structure with a strong (100) texture. Suitable barrier layer materials include refractory transition metal carbides such as vanadium carbide (VC), niobium carbide (NbC), tantalum carbide (TaC), chromium carbide (Cr.sub.3 C.sub.2), tungsten carbide (WC), and molybdenum carbide (MoC).

Weihs, Timothy P. (Baltimore, MD); Barbee, Jr., Troy W. (Palto Alto, CA)

2002-01-01T23:59:59.000Z

43

Curve crossing and negative refraction in simulations of near-field coupled metallic nanoparticle arrays  

E-Print Network (OSTI)

Curve crossing and negative refraction in simulations of near-field coupled metallic nanoparticle-polariton LSPP dispersion on regular arrays of metal nanoparticles in the weak-field and weak-damping limits nanoparticle ar- rays to guide electromagnetic energy of optical frequencies along geometries smaller than

Baer, Roi

44

Metal Oxide Nanoparticles as Bactericidal Agents  

Science Journals Connector (OSTI)

8 Magnesium oxide prepared through an aerogel procedure (AP-MgO)9 yields square and polyhedral shaped nanoparticles with diameters varying slightly around 4 nm, arranged in an extensive porous structure with considerable pore volume. ... Approximately 106 CFU (colony forming units) of bacteria or spores were deposited on water filtration membranes with pore size 0.45 ?m (Millipore Corp.). ... The filters were dried at ambient conditions for 30 min and then completely covered with 0.25 g of AP-MgO/X2 (X = Cl, Br, none). ...

Peter K. Stoimenov; Rosalyn L. Klinger; George L. Marchin; Kenneth J. Klabunde

2002-07-04T23:59:59.000Z

45

Synthesis and characterization of copper doped zinc oxide nanoparticles and its application in energy conversion  

Science Journals Connector (OSTI)

Abstract Solar cells, in general, perform under light source of solar influx, while the heat energy of solar radiation remains unutilized. Using an aqueous suspension of copper doped zinc oxide nanoparticles in specially-designed electrochemical cells we have observed significant voltage (maximum 632.0mV) and storage duration (?47h) upon thermal excitation. The cells exhibit reasonable energy conversion efficiency (maximum 1.36%). These cells generate voltage even at room temperature (?30C) and the voltage increases gradually with increasing temperature. When the platinum foil separating the two compartments of the electrochemical cell is replaced by a planar lipid membrane, all the parameters e.g., thermovoltage, storage capacity and the energy conversion efficiency increase significantly.

Poonam Bandyopadhyay; Anindita Dey; Ruma Basu; Sukhen Das; Papiya Nandy

2014-01-01T23:59:59.000Z

46

Plasmonic transparent conducting metal oxide nanoparticles and nanoparticle films for optical sensing applications  

SciTech Connect

The ability to monitor gas species selectively, sensitively, and reliably in extreme temperatures and harsh conditions is critically important for more efficient energy production using conventional fossil energy based production technologies, enabling advanced technologies for fossil based power plants of the future, and improving efficiency in domestic manufacturing industries. Optical waveguide based sensing platforms have become increasingly important but a need exists for materials that exhibit useful changes in optical properties in response to changing gas atmospheres at high temperatures. In this manuscript, the onset of a near-IR absorption associated with an increase in free carrier density in doped metal oxide nanoparticles to form so-called conducting metal oxides is discussed in the context of results obtained for undoped and Al-doped ZnO nanoparticle based films. Detailed film characterization results are presented along with measured changes in optical absorption resulting from various high temperature treatments in a range of gas atmospheres. Optical property changes are also discussed in the context of a simple model for optical absorption in conducting metal oxide nanoparticles and thin films. The combination of experimental results and theoretical modeling presented here suggests that such materials have potential for high temperature optical gas sensing applications. Simulated sensing experiments were performed at 500 C and a useful, rapid, and reproducible near-IR optical sensing response to H{sub 2} confirms that this class of materials shows great promise for optical gas sensing.

Ohodnicki, Paul R., Jr.; Wang, Congjun; Andio, Mark

2013-07-31T23:59:59.000Z

47

Evolution of Light-Induced Vapor Generation at a Liquid-Immersed Metallic Nanoparticle  

E-Print Network (OSTI)

Evolution of Light-Induced Vapor Generation at a Liquid-Immersed Metallic Nanoparticle Zheyu Fang nanoparticle in a liquid medium is illuminated with resonant light of sufficient intensity, a nanometer scale- known process of liquid boiling, occurring at a single nanoparticle nucleation site, resulting from

Polman, Albert

48

Synthesis of noble metal nanoparticles and their non-ordered superstructures  

Science Journals Connector (OSTI)

...and edited by G. Schmid and D. Fenske Synthesis of noble metal nanoparticles and their...highlights our recent work concerning the synthesis of metal nanoparticles and their non-ordered...properties. The next section deals with the synthesis of non-ordered hydro- and aerogels...

2010-01-01T23:59:59.000Z

49

Quantitative analysis of heavy metals emission during the combustion and baling of polyvinyl chloride insulated copper wire  

E-Print Network (OSTI)

was conducted and compared to the airborne dust samples collected during the baling process. From these results, occupational exposures to heavy metals during the reclamation of PVC insulated copper wire were assessed. Bulk ash and dust samples were ?aken...

Pickard, David Paul

1996-01-01T23:59:59.000Z

50

Observing single molecule chemical reactions on metal nanoparticles.  

SciTech Connect

We report the study of the photodecomposition of single Rhodamine 6G (R6G) dye molecules adsorbed on silver nanoparticles. The nanoparticles were immobilized and spatially isolated on polylysine-derivatized glass coverslips, and confocal laser microspectroscopy was used to obtain surface-enhanced Raman scattering (SERS) spectra from individual R6G molecules. The photodecomposition of these molecules was observed with 150-ms temporal resolution. The photoproduct was identified as graphitic carbon based on the appearance of broad SERS vibrational bands at 1592 cm{sup -1} and 1340 cm{sup -1} observed in both bulk and averaged single-molecule photoproduct spectra. In contrast, when observed at the single-molecule level, the photoproduct yielded sharp SERS spectra. The inhomogeneous broadening of the bulk SERS spectra is due to a variety of photoproducts in different surface orientations and is a characteristic of ensemble-averaged measurements of disordered systems. These single-molecule studies indicate a photodecomposition pathway by which the R6G molecule desorbs from the metal surface, an excited-state photoreaction occurs, and the R6G photoproduct(s) readsorbs to the surface. A SERS spectrum is obtained when either the intact R6G or the R6G photoproduct(s) are adsorbed on a SERS-active site. This work further illustrates the power of single-molecule spectroscopy (SMS) to reveal unique behaviors of single molecules that are not discernable with bulk measurements.

Emory, S. R. (Steven R.); Ambrose, W. Patrick; Goodwin, P. M. (Peter M); Keller, Richard A.

2001-01-01T23:59:59.000Z

51

Photoresponse from noble metal nanoparticles-multi walled carbon nanotube composites  

SciTech Connect

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

52

Aerogel-Coated Metal Nanoparticle Colloids as Novel Entities for the Synthesis of Defined Supported Metal Catalysts  

Science Journals Connector (OSTI)

Aerogel-Coated Metal Nanoparticle Colloids as Novel Entities for the Synthesis of Defined Supported Metal Catalysts ... Nanometer metal particles of tailored size (3?5 nm) and composition prepared via inverse microemulsion were encapsulated by ultrathin coatings (aerogels covered with surface ?OH groups. ... Thus, the product and technology described may be suitable to synthesize these precursor entities of defined metal sizes (as inks) for wash coat/impregnation applications in catalysis. ...

Kai Man K. Yu; Connie M. Y. Yeung; David Thompsett; Shik Chi Tsang

2003-04-10T23:59:59.000Z

53

Nanoparticle generation and transport resulting from femtosecond laser ablation of ultrathin metal films: Time-resolved measurements  

E-Print Network (OSTI)

Nanoparticle generation and transport resulting from femtosecond laser ablation of ultrathin metal April 2014; published online 14 May 2014) The synthesis of metal nanoparticles by ultrafast laser nanoparticles with size distributions that were bimodal for the thicker films, but collapsed into a single mode

Zhigilei, Leonid V.

54

Self- versus directed- assembly of nanoparticles via pulsed laser induced dewetting of patterned metal films  

SciTech Connect

A nanoscale, synthetic perturbation was all that was required to nudge a natural, self-assembly process toward significantly higher order. Metallic thin film strips were transformed into nanoparticle arrays by nanosecond, liquid-phase dewetting. Arrays formed according to an evolving Rayleigh-Plateau instability, yet nanoparticle diameter and pitch were poorly controlled. However, by patterning a nanoscale sinusoid onto the original strip edge, a precise nanoparticle diameter and pitch emerged superseding the naturally evolving Rayleigh-Plateau instability.

Fowlkes, Jason Davidson [ORNL; Kondic, Lou [New Jersey Insitute of Technology; Wu, Yeuyeng [University of Tennessee, Knoxville (UTK); Rack, Philip D [ORNL; Diez, Javier A [Universidad Nacional del Centro de la Provincia de Buenos Aires

2011-01-01T23:59:59.000Z

55

High-throughput metal nanoparticle catalysis by pulsed laser ablation Selim Senkan a,*, Michael Kahn a  

E-Print Network (OSTI)

High-throughput metal nanoparticle catalysis by pulsed laser ablation Selim Senkan a,*, Michael online 18 July 2006 Abstract A high-throughput pulsed laser ablation (HT-PLA) system was developed-TEM) and energy dispersive X-ray (EDX) spectroscopy, respectively. The supported nanoparticles created by HT

Senkan, Selim M.

56

Surfactant Organic Molecules Restore Magnetism in Metal-Oxide Nanoparticle Surfaces  

E-Print Network (OSTI)

Surfactant Organic Molecules Restore Magnetism in Metal-Oxide Nanoparticle Surfaces Juan Salafranca, Nashville, Tennessee 37235, United States *S Supporting Information ABSTRACT: The properties of magnetic nanoparticles tend to be depressed by the unavoidable presence of a magnetically inactive surface layer. However

Pennycook, Steve

57

Argonne Scientists Discover Networks of Metal Nanoparticles are Culprits in Alloy Corrosion  

Science Journals Connector (OSTI)

Oxide scales are supposed to protect alloys from extensive corrosion, but scientists at U.S. Department of Energys Argonne National Laboratory have discovered metal nanoparticle chinks...

2009-02-01T23:59:59.000Z

58

A model for the latent heat of melting in free standing metal nanoparticles  

SciTech Connect

Nanoparticles of many metals are known to exhibit scale dependent latent heats of melting. Analytical models for this phenomenon have so far failed to completely capture the observed phenomena. Here we present a thermodynamic analysis for the melting of metal nanoparticles in terms of their internal energy and a scale dependent surface tension proposed by Tolman. The resulting model predicts the scale dependence of the latent heat of melting and is confirmed using published data for tin and aluminum.

Shin, Jeong-Heon; Deinert, Mark R., E-mail: mdeinert@mail.utexas.edu [Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78715 (United States)

2014-04-28T23:59:59.000Z

59

Synthesis of noble metal nanoparticles and their non-ordered superstructures  

Science Journals Connector (OSTI)

...synthesis of non-ordered hydro- and aerogels from the as-prepared sols. Very light...the noble metal. metal nanoparticles|aerogels|superstructures|non-ordered|biotemplate...approach for non-supported hydro- and aerogels and one templated approach yielding hybrid...

2010-01-01T23:59:59.000Z

60

Hydrogen-on-Demand Using Metallic Alloy Nanoparticles in Water Kohei Shimamura,,,,,  

E-Print Network (OSTI)

energy to regenerate metal fuel.1-3 One potential application of this technology is on-board hydrogenHydrogen-on-Demand Using Metallic Alloy Nanoparticles in Water Kohei Shimamura,,,�,, Fuyuki Shimojo Supporting Information ABSTRACT: Hydrogen production from water using Al particles could provide a renewable

Southern California, University of

Note: This page contains sample records for the topic "metallic copper nanoparticles" 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

BIOMONITORING OF HEAVY METAL POLLUTION NEAR COPPER SMELTER IN BOR (SERBIA) USING ACACIA  

E-Print Network (OSTI)

The correlations between sampling sites situated in the close vicinity of copper smelter (Bor, Serbia) based on heavy metal (Pb, Cu, Zn) content in plant parts and soil of acacia (Robinia pseudoacacia L.) were determined. Very strong correlations (R 2>0.9) were observed between the sites Town park and Hospital in the urban-industiral zone due to high air pollution in this sampling area. The performed cluster analysis confirmed these results by grouping the sites with high metal content in plant and soil material of Robinia pseudoacacia into the same clusters. Also, strong correlations were noted between less polluted sampling sites (Bor lake and Brestovac spa) with the control site (Sumrakovac).

Ana A. Ilic; Snezana M. Serbula; Jelena V. Kalinovic; Tanja S. Kalinovic

62

Nanoparticle generation and transport resulting from femtosecond laser ablation of ultrathin metal films: Time-resolved measurements and molecular dynamics  

E-Print Network (OSTI)

Nanoparticle generation and transport resulting from femtosecond laser ablation of ultrathin metal and redeposited nanoparticles J. Appl. Phys. 115, 124302 (2014); 10.1063/1.4869456 Impact of wavelength dependent thermo-elastic laser ablation mechanism on the generation of nanoparticles from thin gold films Appl

Geohegan, David B.

63

Changes in metal nanoparticle shape and size induced by swift heavy-ion irradiation M.C. Ridgway1  

E-Print Network (OSTI)

Changes in metal nanoparticle shape and size induced by swift heavy-ion irradiation M.C. Ridgway1 and Au nanoparticles induced by swift heavy-ion irradiation (SHII) have been characterized using-edge structure. Elemental nanoparticles of diameters 2-15 nm were first formed in amorphous SiO2 by ion

Paris-Sud XI, Université de

64

Dispersion strengthened copper  

DOE Patents (OSTI)

A composition of matter is described which is comprised of copper and particles which are dispersed throughout the copper, where the particles are comprised of copper oxide and copper having a coating of copper oxide. A method for making this composition of matter is also described. This invention relates to the art of powder metallurgy and, more particularly, it relates to dispersion strengthened metals.

Sheinberg, H.; Meek, T.T.; Blake, R.D.

1990-01-09T23:59:59.000Z

65

Metal Nanoparticles Enhanced Optical Absorption in Thin Film Solar Cells  

Science Journals Connector (OSTI)

The plasmonic enhanced absorption for thin film solar cells with silver nanoparticles (NPs) deposited on top of the amorphous silicon film (a-Si:H) solar cells and embedded inside the...

Xie, Wanlu; Liu, Fang; Qu, Di; Xu, Qi; Huang, Yidong

66

Study on metal nanoparticles induced third-order optical nonlinearity in phenylhydrazone derivatives with DFWM technique  

SciTech Connect

The third-order nonlinear optical properties of newly synthesized phenylhydrazone derivatives and the influence of noble metal nanoparticles (Ag and Au) on their nonlinear optical responses were investigated by employing Degenerate Four wave Mixing (DFWM) technique with a 7 nanosecond, 10Hz Nd: YAG laser pulses at 532nm. Metal nanoparticles were prepared by laser ablation and the particle formation was confirmed using UV-Visible spectroscopy, Transmission Electron Microscopy (TEM). The nonlinear optical susceptibility were measured and found to be of the order 10{sup ?13}esu. The results are encouraging and conclude that the materials are promising candidate for future optical device applications.

Sudheesh, P.; Chandrasekharan, K. [Laser and Nonlinear Optics Laboratory, Department of Physics, National Institute of Technology Calicut (India); Rao, D. Mallikharjuna [Nano Display Laboratory, School of Nanoscience and Technology, National Institute of Technology Calicut (India)

2014-01-28T23:59:59.000Z

67

On the Electric Conductivity of Highly Ordered Monolayers of Monodisperse Metal Nanoparticles  

Science Journals Connector (OSTI)

On the Electric Conductivity of Highly Ordered Monolayers of Monodisperse Metal Nanoparticles ... These observations are supported by finite element method calculations showing the self-capacitance to be the determining value which only depends on the permittivity constant of the surrounding space and the particles radius. ... In this paper we discuss the different transport properties of nanoparticle films and supercrystals which are governed in contrast to conventional crystals or metal films by the presence of tunnel barriers between the particles if the tunneling resistance Rt considerably exceeds the resistance quantum Rt ? h/e2 = 25.8 k?, with the Planck constant h and the elementary charge e. ...

Denis Greshnykh; Andreas Frmsdorf; Horst Weller; Christian Klinke

2008-12-22T23:59:59.000Z

68

Silica coated magnetite nanoparticles for removal of heavy metal ions from polluted waters  

E-Print Network (OSTI)

Magnetic removal of Hg2+ and other heavy metal ions like Cd2+, Pb2+ etc. using silica coated magnetite particles from polluted waters is a current topic of active research to provide efficient water recycling and long term high quality water. The technique used to study the bonding characteristics of such kind of nanoparticles with the heavy metal ions is a very sensitive hyperfine specroscopy technique called the perturbed angular correlation technique (PAC).

Dash, Monika

2013-01-01T23:59:59.000Z

69

Evolution of the Surface Science of Catalysis from Single Crystals to Metal Nanoparticles under Pressure  

SciTech Connect

Vacuum studies of metal single crystal surfaces using electron and molecular beam scattering revealed that the surface atoms relocate when the surface is clean (reconstruction) and when it is covered by adsorbates (adsorbate induced restructuring). It was also discovered that atomic steps and other low coordination surface sites are active for breaking chemical bonds (H-H, O=O, C-H, C=O and C-C) with high reaction probability. Investigations at high reactant pressures using sum frequency generation (SFG)--vibrational spectroscopy and high pressure scanning tunneling microscopy (HPSTM) revealed bond breaking at low reaction probability sites on the adsorbate-covered metal surface, and the need for adsorbate mobility for continued turnover. Since most catalysts (heterogeneous, enzyme and homogeneous) are nanoparticles, colloid synthesis methods were developed to produce monodispersed metal nanoparticles in the 1-10 nm range and controlled shapes to use them as new model catalyst systems in two-dimensional thin film form or deposited in mesoporous three-dimensional oxides. Studies of reaction selectivity in multipath reactions (hydrogenation of benzene, cyclohexene and crotonaldehyde) showed that reaction selectivity depends on both nanoparticle size and shape. The oxide-metal nanoparticle interface was found to be an important catalytic site because of the hot electron flow induced by exothermic reactions like carbon monoxide oxidation.

Somorjai, Gabor A.; Park, Jeong Y.

2008-03-06T23:59:59.000Z

70

Acoustic modes in metallic nanoparticles: Atomistic versus elasticity modeling  

Science Journals Connector (OSTI)

The validity of the linear elasticity theory is examined at the nanometer scale by investigating the vibrational properties of silver and gold nanoparticles whose diameters range from about 1.54 nm. Comparing the vibration modes calculated by elasticity theory and atomistic simulation based on the embedded-atom method, we first show that the anisotropy of the stiffness tensor in elastic calculation is essential to ensure a good agreement between elastic and atomistic models. Second, we illustrate the reduction in the number of vibration modes due to the diminution of the number of atoms when reducing the nanoparticles size. Finally, we exhibit a breakdown of the frequency-spectra scaling of the vibration modes and attribute it to surface effects. Some critical sizes under which such effects are expected, depending on the material and the considered vibration modes, are given.

Nicolas Combe and Lucien Saviot

2009-07-10T23:59:59.000Z

71

Modeling metallic nanoparticle synthesis in a magnetron-based nanocluster source by gas condensation of a sputtered vapor  

SciTech Connect

Copper nanoparticles (NPs) were synthesized by inert-gas condensation of a sputtered metallic vapor using a dedicated commercial reactor. By controlling the time of residence of NPs in the carrier gas phase via the tuning of the collision path length, Cu NPs were produced. They exhibit various and well controlled diameters (3-10 nm) and a relatively narrow size dispersion. On the basis of these experimental results, a detailed modeling of NP nucleation and growth based on the classical nucleation theory was developed. It takes into account the peculiar geometry and thermal profile of the NP reactor. The simulated curves, calculated by a MATLAB program developed for that purpose, exhibit a good qualitative agreement with experiment. Moreover, they highlight the role of process parameters and the strong influence of the reactor temperature profile on the NP size distribution. In the future, such calculations could be used for the optimization of the NP source design in order to increase its efficiency and reproducibility.

Quesnel, E; Pauliac-Vaujour, E; Muffato, V [CEA-G/DRT/LITEN/DTNM, rue des Martyrs, 38054 Grenoble Cedex 9 (France)

2010-03-15T23:59:59.000Z

72

Final Report: Sintered CZTS Nanoparticle Solar Cells on Metal Foil; July 26, 2011 - July 25, 2012  

SciTech Connect

This is the final report covering 12 months of this subcontract for research on high-efficiency copper zinc tin sulfide (CZTS)-based thin-film solar cells on flexible metal foil. Each of the first three quarters of the subcontract has been detailed in quarterly reports. In this final report highlights of the first three quarters will be provided and details will be given of the final quarter of the subcontract.

Leidholm, C.; Hotz, C.; Breeze, A.; Sunderland, C.; Ki, W.; Zehnder, D.

2012-09-01T23:59:59.000Z

73

In Vivo Effect of Copper and Silver on Synthesis of Gold Nanoparticles inside Living Plants  

Science Journals Connector (OSTI)

(6) In order to investigate the effect of plant metal combination on the absorbance of light by plant ash, the reflectance spectra of each ash sample prepared for the SEM study was obtained using a Field Spec Pro instrument (Analytical Spectral Devices, Inc., Boulder, CO) fitted with a plant probe (model A122317). ... A physiological mechanism for metal uptake after EDTA application to soil was described by Nowack et al.(20) Presumably, a similar mechanism can be expected for cyanide, where the increased salt concentration in soil solution associated with KCN treatment disrupts the natural barrier at the endodermis, allowing the metal complex to flood in via the xylem. ...

Christopher W.N. Anderson; Saleem M. Bhatti; Jorge Gardea-Torresdey; Jason Parsons

2013-04-30T23:59:59.000Z

74

Recent trends in the microwave-assisted synthesis of metal oxide nanoparticles supported on carbon nanotubes and their applications  

Science Journals Connector (OSTI)

The study of coating carbon nanotubes with metal/oxides nanoparticles is now becoming a promising and challenging area of research. To optimize the use of carbon nanotubes in various applications, it is necessary to attach functional groups or other ...

Sarah C. Motshekga; Sreejarani K. Pillai; Suprakas Sinha Ray; Kalala Jalama; Rui. W. M. Krause

2012-01-01T23:59:59.000Z

75

Directed Assembly of Bi Metallic Nanoparticles by Pulsed Laser Induced Dewetting: a Unique Nanoscale Time and Length Scale Regime  

SciTech Connect

Pulsed laser induced dewetting (PLiD) was used to assemble patterned, nanoscale metallic thin film features into bi metallic nanoparticles. The liquid-phase flow is related to a conventional droplet impact test and in appropriate dimensions have inertial and viscoinertial flow characteristics. The final size, morphology, composition, and inter-diffusion of the nanoparticles is governed by the interplay of capillary, inertial and viscous forces and an appropriate dimensional regime defined by competing Rayleigh-Plateau and spinodal instabilities.

Fowlkes, Jason Davidson [ORNL; Rack, P. D. [University of Tennessee, Knoxville (UTK); Wu, Yeuyeng [University of Tennessee, Knoxville (UTK)

2010-01-01T23:59:59.000Z

76

Metal nanoparticles in catalytic polymer membranes and ion-exchange systems for advanced purification of water from molecular oxygen  

Science Journals Connector (OSTI)

Methods of synthesis of metal nanoparticles and metal/polymer nanocomposites including ion-exchange materials are considered. The effect of the composition and size of nanoparticles on their catalytic activity is analyzed. Attention is focused on the composites used in catalytic processes, namely, catalytic membranes and ion-exchange systems. The problems associated with the removal of dissolved oxygen from water by means of such composites are discussed. The bibliography includes 225 references.

V V Volkov; T A Kravchenko; Vyacheslav I Roldughin

2013-01-01T23:59:59.000Z

77

COPPER DEFICIENCY PROPHYLAXIS IN GRAZING SHEEP BY COPPER OXIDE INJECTION  

E-Print Network (OSTI)

COPPER DEFICIENCY PROPHYLAXIS IN GRAZING SHEEP BY COPPER OXIDE INJECTION M. LAMAND Claudine LAB R of insoluble and non ionized form of injected copper has been shown in a previous paper (Lamand, 1978 it appeared that copper oxide was preferable to metallic copper, being slightly less caustic. Inflammation

Boyer, Edmond

78

Monodisperse metal nanoparticle catalysts on silica mesoporous supports: synthesis, characterizations, and catalytic reactions  

SciTech Connect

The design of high performance catalyst achieving near 100% product selectivity at maximum activity is one of the most important goals in the modern catalytic science research. To this end, the preparation of model catalysts whose catalytic performances can be predicted in a systematic and rational manner is of significant importance, which thereby allows understanding of the molecular ingredients affecting the catalytic performances. We have designed novel 3-dimensional (3D) high surface area model catalysts by the integration of colloidal metal nanoparticles and mesoporous silica supports. Monodisperse colloidal metal NPs with controllable size and shape were synthesized using dendrimers, polymers, or surfactants as the surface stabilizers. The size of Pt, and Rh nanoparticles can be varied from sub 1 nm to 15 nm, while the shape of Pt can be controlled to cube, cuboctahedron, and octahedron. The 3D model catalysts were generated by the incorporation of metal nanoparticles into the pores of mesoporous silica supports via two methods: capillary inclusion (CI) and nanoparticle encapsulation (NE). The former method relies on the sonication-induced inclusion of metal nanoparticles into the pores of mesoporous silica, whereas the latter is performed by the encapsulation of metal nanoparticles during the hydrothermal synthesis of mesoporous silica. The 3D model catalysts were comprehensively characterized by a variety of physical and chemical methods. These catalysts were found to show structure sensitivity in hydrocarbon conversion reactions. The Pt NPs supported on mesoporous SBA-15 silica (Pt/SBA-15) displayed significant particle size sensitivity in ethane hydrogenolysis over the size range of 1-7 nm. The Pt/SBA-15 catalysts also exhibited particle size dependent product selectivity in cyclohexene hydrogenation, crotonaldehyde hydrogenation, and pyrrole hydrogenation. The Rh loaded SBA-15 silica catalyst showed structure sensitivity in CO oxidation reaction. In addition, Pt-mesoporous silica core-shell structured NPs (Pt{at}mSiO{sub 2}) were prepared, where the individual Pt NP is encapsulated by the mesoporous silica layer. The Pt{at}mSiO{sub 2} catalysts showed promising catalytic activity in high temperature CO oxidation. The design of catalytic structures with tunable parameters by rational synthetic methods presents a major advance in the field of catalyst synthesis, which would lead to uncover the structure-function relationships in heterogeneous catalytic reactions.

Somorjai, G.A.

2009-09-14T23:59:59.000Z

79

Nitrogen-Doped Anatase Nanofibers Decorated with Noble Metal Nanoparticles for Photocatalytic Production of Hydrogen  

Science Journals Connector (OSTI)

Nitrogen-Doped Anatase Nanofibers Decorated with Noble Metal Nanoparticles for Photocatalytic Production of Hydrogen ... High-aspect-ratio titanate nanotubes (NT) and nanowires (NW) were produced by the hydrothermal conversion of TiO2 at 400 K. ... Two novel deposition methods were used to synthesize Pt-TiO2 composite photoelectrodes: a tilt-target room temperature sputtering method and aerosol-chemical vapor deposition (ACVD). ...

Ming-Chung Wu; Jussi Hiltunen; Andrs Spi; Anna Avila; William Larsson; Hsueh-Chung Liao; Mika Huuhtanen; Gza Tth; Andrey Shchukarev; Nomi Laufer; kos Kukovecz; Zoltn Knya; Jyri-Pekka Mikkola; Riitta Keiski; Wei-Fang Su; Yang-Fang Chen; Heli Jantunen; Pulickel M. Ajayan; Robert Vajtai; Krisztin Kords

2011-05-13T23:59:59.000Z

80

Single metallic nanoparticle imaging for protein detection in cells  

Science Journals Connector (OSTI)

...to sensitive areas. The main...intensities. Single large metal particles...particle at its plasma resonance...a humidified atmosphere (95%) at...frequency of 1 MHz, we find {delta}{phi...for example, larger heating intensities...frequency of 1 MHz, we measured {delta...per focal spot area ?0.07 {mu...

L. Cognet; C. Tardin; D. Boyer; D. Choquet; P. Tamarat; B. Lounis

2003-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "metallic copper nanoparticles" 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

Nanoparticle  

Science Journals Connector (OSTI)

Nanoparticles are submicron particles covering the size range 20200 nm (diameter). Two general methods are applied for production of nanoparticles: the topdown approach, where one starts with the bulk material ...

Prof. Tharwat Tadros

2013-01-01T23:59:59.000Z

82

Thermal conductivity studies of novel nanofluids based on metallic silver decorated mesoporous silica nanoparticles  

SciTech Connect

Graphical abstract: - Highlights: Metallic silver was decorated in mSiO{sub 2} with grafted hemiaminal functional groups. Synthesized nanoparticles were used for preparation of glycerol based nanofluids. The effect of temperature, weight fraction of mSiO{sub 2} and concentration of silver nanoparticles on thermal conductivity of nanofluids was investigated. - Abstract: In the present study, the mesoporous structure of silica (mSiO{sub 2}) nanoparticles as well as hemiaminal grafted mSiO{sub 2} decorated by metallic silver (Ag/mSiO{sub 2}) has been used for the preparation of glycerol based nanofluids. Structural and morphological characterization of the synthesized products have been carried out using Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), X-ray diffraction (XRD), UVvis spectroscopy, inductively coupled plasma (ICP) and N{sub 2} adsorptiondesorption isotherms. The thermal conductivity and viscosity of the nanofluids have been measured as a function of temperature for various weight fractions and silver concentrations of mSiO{sub 2} and Ag/mSiO{sub 2} nanoparticles, respectively. The results show that the thermal conductivity of the nanofluids increase up to 9.24% as the weight fraction of mSiO{sub 2} increases up to 4 wt%. Also, increasing the percent of the silver decorated mSiO{sub 2} (Ag/mSiO{sub 2}) up to 2.98% caused an enhancement in the thermal conductivity of the base fluid up to 10.95%. Furthermore, the results show that the nanofluids have Newtonian behavior in the tested temperature range for various concentrations of nanoparticles.

Tadjarodi, Azadeh, E-mail: tajarodi@iust.ac.ir [Research Laboratory of Inorganic Materials Synthesis, Department of Chemistry, Iran University of Science and Technology, 16846-13114 Tehran (Iran, Islamic Republic of); Zabihi, Fatemeh [Research Laboratory of Inorganic Materials Synthesis, Department of Chemistry, Iran University of Science and Technology, 16846-13114 Tehran (Iran, Islamic Republic of); Chemistry and Nanotechnology Laboratory, National Center for Laser Science and Technology, Tehran (Iran, Islamic Republic of)

2013-10-15T23:59:59.000Z

83

Copper exclusion as a mechanism of heavy metal tolerance in a green alga  

Science Journals Connector (OSTI)

... with an Evans Electroselenium 240 atomic absorption spectrophotometer fitted with a Shandon Southern Instruments A3470 flameless attachment (carbon rod). Results are expressed as percentage dry weight as copper, computed ...

PATRICIA L. FOSTER

1977-09-22T23:59:59.000Z

84

Colloid Science of Metal Nanoparticle Catalysts in 2D and 3D Structures. Challenges of Nucleation, Growth, Composition, Particle Shape, Size Control and their Influence on Activity and Selectivity  

E-Print Network (OSTI)

which are all in the nanoparticle size range and toto the 2D and 3D nanoparticle arrays that are composed ofColloid Science of Metal Nanoparticle Catalysts in 2D and 3D

Somorjai, Gabor A.

2009-01-01T23:59:59.000Z

85

The distribution of copper, manganese, zinc, and iron in antarctic waters and the relation of the concentrations of these metals to biological primary productivity  

E-Print Network (OSTI)

THE DISTRIBUTION OF COPPER, MANGANESE, ZINC, AND IRON IN ANTARCTIC WATERS AND THE RELATION OF THE CONCENTRATIONS OF THESE METALS TO BIOLOGICAL PRIMARY PRODUCTIVITY A Thesis By MARTIN EDWARD ARHELGER Submitted to the Graduate College... of the Texas A& 1 University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE August I967 Major Subj ect: CHEMICAL OCEANOGRAPHY THE DISTRIBUTION OF COPPER, MANGANESE, ZINC, AND IRON IN ANTARCTIC WATERS AND THE RELATION...

Arhelger, Martin Edward

1967-01-01T23:59:59.000Z

86

Removal of copper from ferrous scrap  

DOE Patents (OSTI)

A process for removing copper from ferrous or other metal scrap in which the scrap is contacted with a polyvalent metal sulfide slag in the presence of an excess of copper-sulfide forming additive to convert the copper to copper sulfide which is extracted into the slag to provide a ratio of copper in the slag to copper in the metal scrap of at least about 10.

Blander, M.; Sinha, S.N.

1987-07-30T23:59:59.000Z

87

Removal of copper from ferrous scrap  

DOE Patents (OSTI)

A process for removing copper from ferrous or other metal scrap in which the scrap is contacted with a polyvalent metal sulfide slag in the presence of an excess of copper-sulfide forming additive to convert the copper to copper sulfide which is extracted into the slag to provide a ratio of copper in the slag to copper in the metal scrap of at least about 10.

Blander, Milton (12833 S. 82nd Ct., Palos Park, IL 60464); Sinha, Shome N. (5748 Drexel, 2A, Chicago, IL 60637)

1990-01-01T23:59:59.000Z

88

Strengthening porous metal skeletons by metal deposition from a nanoparticle dispersion  

E-Print Network (OSTI)

The accuracy of solid freeform fabrication processes such as three-dimensional printing (3DP) and selective laser sintering (SLS) must be improved for them to achieve wide application in direct production of metal parts. ...

Crane, Nathan B., 1974-

2005-01-01T23:59:59.000Z

89

Plasmonic transparent conducting metal oxide nanoparticles and films for optical sensing applications  

DOE Patents (OSTI)

The disclosure relates to a method of detecting a change in a chemical composition by contacting a doped oxide material with a monitored stream, illuminating the doped oxide material with incident light, collecting exiting light, monitoring an optical signal based on a comparison of the incident light and the exiting light, and detecting a shift in the optical signal. The doped metal oxide has a carrier concentration of at least 10.sup.18/cm.sup.3, a bandgap of at least 2 eV, and an electronic conductivity of at least 10.sup.1 S/cm, where parameters are specified at a temperature of 25.degree. C. The optical response of the doped oxide materials results from the high carrier concentration of the doped metal oxide, and the resulting impact of changing gas atmospheres on that relatively high carrier concentration. These changes in effective carrier densities of conducting metal oxide nanoparticles are postulated to be responsible for the change in measured optical absorption associated with free carriers. Exemplary doped metal oxides include but are not limited to Al-doped ZnO, Sn-doped In.sub.2O.sub.3, Nb-doped TiO.sub.2, and F-doped SnO.sub.2.

Ohodnicki, Jr., Paul R; Wang, Congjun; Andio, Mark A

2014-01-28T23:59:59.000Z

90

Electronically conducting metal oxide nanoparticles and films for optical sensing applications  

DOE Patents (OSTI)

The disclosure relates to a method of detecting a change in a chemical composition by contacting a conducting oxide material with a monitored stream, illuminating the conducting oxide material with incident light, collecting exiting light, monitoring an optical signal based on a comparison of the incident light and the exiting light, and detecting a shift in the optical signal. The conducting metal oxide has a carrier concentration of at least 10.sup.17/cm.sup.3, a bandgap of at least 2 eV, and an electronic conductivity of at least 10.sup.-1 S/cm, where parameters are specified at the gas stream temperature. The optical response of the conducting oxide materials is proposed to result from the high carrier concentration and electronic conductivity of the conducting metal oxide, and the resulting impact of changing gas atmospheres on that relatively high carrier concentration and electronic conductivity. These changes in effective carrier densities and electronic conductivity of conducting metal oxide films and nanoparticles are postulated to be responsible for the change in measured optical absorption associated with free carriers. Exemplary conducting metal oxides include but are not limited to Al-doped ZnO, Sn-doped In.sub.2O.sub.3, Nb-doped TiO.sub.2, and F-doped SnO.sub.2.

Ohodnicki, Jr., Paul R.; Wang, Congjun; Andio, Mark A

2014-09-16T23:59:59.000Z

91

Electrodepositionof Metal Alloyand Mixed Oxide Films Usinga Single-PrecursorTetranuclearCopper-NickelComplex  

E-Print Network (OSTI)

Compositionally uniform mixed metals, metal oxides, and alloys are used extensively as corrosion protective and catalysts. I-~For example, nickel-containing oxides and alloys are used for oxidative protection of very. Although Cu-Ni alloy deposition has been stud- ied for many years, none of the previous approaches has led

Kounaves, Samuel P.

92

Metal Nitride and Metal Carbide Nanoparticles by a Soft Urea Pathway  

Science Journals Connector (OSTI)

It also worth noting that in the presence of the metal precursors, the solubility of urea (or similar compounds) is significantly higher than in pure ethanol (4.877 g/100 g at 18.2 C), which already indicates the formation of soluble complexes and coordination polymers. ... HRTEM shown well-developed lattice fringes, with d = 2.43 as interplanar distance, corresponding to the plane 101 of the hexagonal structures of gallium nitride (dcalcd = 2.43765 , ref ICDD-PDF4+ 01?089?7522). ... (Oxy)nitrides as new photocatalysts for water splitting under visible light irradiation ...

Cristina Giordano; Christian Erpen; Weitang Yao; Bettina Milke; Markus Antonietti

2009-10-07T23:59:59.000Z

93

Subsurface Synthesis and Characterization of Ag Nanoparticles...  

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

Synthesis and Characterization of Ag Nanoparticles Embedded in MgO. Subsurface Synthesis and Characterization of Ag Nanoparticles Embedded in MgO. Abstract: Metal nanoparticles...

94

A Ship in a Bottle Strategy To Load a Hydrophilic Anticancer Drug in Porous Metal Organic Framework Nanoparticles: Efficient Encapsulation, Matrix Stabilization, and Photodelivery  

Science Journals Connector (OSTI)

A Ship in a Bottle Strategy To Load a Hydrophilic Anticancer Drug in Porous Metal Organic Framework Nanoparticles: Efficient Encapsulation, Matrix Stabilization, and Photodelivery ... The attachment of the GO C layers to the spherical cages of MIL-100(Fe) (via coordination between the O groups of GO and the metallic sites of the metal-org. ...

Maria Rosaria di Nunzio; Valentina Agostoni; Boiko Cohen; Ruxandra Gref; Abderrazzak Douhal

2013-12-17T23:59:59.000Z

95

Determining whether metals nucleate homogeneously on graphite: A case study with copper  

SciTech Connect

We observe that Cu clusters grow on surface terraces of graphite as a result of physical vapor deposition in ultrahigh vacuum. We show that the observation is incompatible with a variety of models incorporating homogeneous nucleation and calculations of atomic-scale energetics. An alternative explanation, ion-mediated heterogeneous nucleation, is proposed and validated, both with theory and experiment. This serves as a case study in identifying when and whether the simple, common observation of metal clusters on carbon-rich surfaces can be interpreted in terms of homogeneous nucleation. We describe a general approach for making system-specific and laboratory-specific predictions.

Appy, David [Ames Laboratory; Lei, Huaping [Ames Laboratory; Han, Yong [Ames Laboratory; Wang, Cai-Zhuang [Ames Laboratory; Tringides, Michael C [Ames Laboratory; Shao, Dahai [Ames Laboratory; Kwolek, Emma J [Iowa State University; Evans, J W [Ames Laboratory; Thiel, P A [Ames Laboratory

2014-11-01T23:59:59.000Z

96

Nanoparticles  

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

Benjamin Gilbert1, Feng Huang1, Hengzhong Zhang1, Glenn A. Waychunas2, and Benjamin Gilbert1, Feng Huang1, Hengzhong Zhang1, Glenn A. Waychunas2, and Jillian F. Banfield1,2 1Department of Earth and Planetary Sciences, University of California at Berkeley 2Earth Sciences Division, Lawrence Berkeley National Laboratory Using synchrotron techniques, Benjamin Gilbert and colleagues in Jill Banfield's group at the University of California - Berkeley and Glenn Waychunas at LBNL have determined how the equilibrium structure and lattice dynamics of zinc sulfide (ZnS) nanoparticles differ from bulk ZnS. They combined size and shape information from small-angle x-ray scattering (SAXS) with structure information from wide-angle x-ray scattering (WAXS) to analyze structural differences in the real-space pair distribution function (PDF). By combining SAXS and WAXS, they were able to remove the small-particle size contribution to x-ray diffraction peak broadening and quantify the excess disorder and strain in the nanoparticles relative to bulk ZnS.

97

In Situ Studies of the Active Sites for the Water Gas Shift Reaction over Cu-CeO2 Catalysts: Complex Interaction Between Metallic Copper and Oxygen Vacancies of Ceria  

SciTech Connect

New information about the active sites for the water gas shift (WGS) reaction over Cu-CeO{sub 2} systems was obtained using in-situ, time-resolved X-ray diffraction (TR-XRD), X-ray absorption spectroscopy (TR-XAS, Cu K and Ce L3 edges), and infrared spectroscopy (DRIFTS). Cu-CeO{sub 2} nanoparticles prepared by a novel reversed microemulsion method (doped Ce1-xCuxO2 sample) and an impregnation method (impregnated CuO{sub x}/CeO{sub 2} sample) were studied. The results from all of the samples indicate that both metallic copper and oxygen vacancies in ceria were involved in the generation of active sites for the WGS reaction. Evidence was found for a synergistic Cu-O vacancy interaction. This interaction enhances the chemical activity of Cu, and the presence of Cu facilitates the formation of O vacancies in ceria under reaction conditions. Water dissociation occurred on the O vacancy sites or the Cu-O vacancy interface. No significant amounts of formate were formed on the catalysts during the WGS reaction. The presence of strongly bound carbonates is an important factor for the deactivation of the catalysts at high temperatures. This work identifies for the first time the active sites for the WGS reaction on Cu-CeO{sub 2} catalysts and illustrates the importance of in situ structural studies for heterogeneous catalytic reactions.

Wang,X.; Rodriguez, J.; Hanson, J.; Gamarra, D.; Martinez-Arias, A.; Fernandez-Garcia, M.

2006-01-01T23:59:59.000Z

98

Uptake of Toxic Metal Ions from Water by Naked and Monolayer Protected Silver Nanoparticles: An X-ray Photoelectron Spectroscopic Investigation  

Science Journals Connector (OSTI)

Uptake of Toxic Metal Ions from Water by Naked and Monolayer Protected Silver Nanoparticles: An X-ray Photoelectron Spectroscopic Investigation ... Several other remedial measures including nano zerovalent iron (nzvi) has been proposed. ... Although several studies have investigated gold from the perspective of heavy metal remediation, investigations to such depth have not happened with silver. ...

M. S. Bootharaju; T. Pradeep

2010-04-15T23:59:59.000Z

99

Extracellular Palladium Nanoparticle Production using Geobacter sulfurreducens  

E-Print Network (OSTI)

Extracellular Palladium Nanoparticle Production using Geobacter sulfurreducens Matthew D. Yates catalytic nanoparticles. Palladium nanoparticles can be produced via microbial reduction of soluble Pd(II) to Pd(0), but in previous tests using dissimilatory metal reducing bacteria (DMRB), the nanoparticles

100

Magnetic and structural characterization of transition metal co-doped CdS nanoparticles  

Science Journals Connector (OSTI)

We report the structural and magnetic properties of the CdS nanoparticles co-doped with Ni and Cu; 3% Ni, Cu co-doped CdS nanoparticles were synthesized by using wet chemical ... average diameter of the Ni, Cu co...

Sanjeev Kumar; Sunil Kumar; Sanyog Jain; N. K. Verma

2012-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "metallic copper nanoparticles" 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

Copper studies for alternative salt disposition  

SciTech Connect

The purpose of this study is to determine, as functions of total copper loading and iron REDOX in glass, any dependence of the leaching behavior of borosilicate glass on metallic copper.

Brown, K.G.

2000-01-26T23:59:59.000Z

102

Microwave-assisted synthesis and photovoltaic measurements of CuInS{sub 2} nanoparticles prepared by using metalorganic precursors  

SciTech Connect

Highlights: ? CuInS{sub 2} nanoparticles were prepared using complexes via a microwave-assisted method. ? The effect of preparation parameters on the morphology of CuInS{sub 2} was investigated. ? The as-deposited CdS/CuInS{sub 2} films were used for the photovoltaic measurements. -- Abstract: In this work, CuInS{sub 2} (CIS) nanoparticles have been synthesized with the aid of (1,8-diamino-3,6-dioxaoctan)copper(II) sulfate ([Cu(DADO)]SO{sub 4}) and bis(propylenediamine)copper(II) sulfate ([Cu(pn){sub 2}]SO{sub 4}) complexes as copper precursor in the presence of microwave irradiation. Besides, L-cystine, InCl{sub 3}, and sodium dodecyl sulfate (SDS) were applied as sulfur source, indium precursor, and capping agent, respectively. To investigate the effect of preparation parameters like microwave power and irradiation time on the morphology and particle size of CuInS{sub 2}, the experiment was carried out at different conditions. The as-synthesized CuInS{sub 2} nanoparticles were characterized by XRD, FT-IR, PL, SEM, TEM, and EDS. The XRD results showed that pure tetragonal CuInS{sub 2} could be only obtained after annealing at 400 C for 2 h. The SEM images indicated that with decreasing the microwave power and irradiation time, particle size of CuInS{sub 2} nanoparticles decreased. To fabricate a solar cell, CdS film was directly deposited on top of the CIS film prepared by Doctor's blade method through chemical bath deposition. The as-deposited CdS/CuInS{sub 2} films were used for the photovoltaic measurements.

Hosseinpour-Mashkani, S. Mostafa [Center for Nanoscience and Technology, IST, Jawaharlal Nehru Technological University Hyderabad, Hyderabad 500 085, Andhra Pradesh (India)] [Center for Nanoscience and Technology, IST, Jawaharlal Nehru Technological University Hyderabad, Hyderabad 500 085, Andhra Pradesh (India); Mohandes, Fatemeh [Department of Inorganic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, P.O. Box 87317-51167, Islamic Republic of Iran (Iran, Islamic Republic of)] [Department of Inorganic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, P.O. Box 87317-51167, Islamic Republic of Iran (Iran, Islamic Republic of); Salavati-Niasari, Masoud, E-mail: salavati@kashanu.ac.ir [Department of Inorganic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, P.O. Box 87317-51167, Islamic Republic of Iran (Iran, Islamic Republic of) [Department of Inorganic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, P.O. Box 87317-51167, Islamic Republic of Iran (Iran, Islamic Republic of); Institute of Nano Science and Nano Technology, University of Kashan, Kashan, P.O. Box 87317-51167, Islamic Republic of Iran (Iran, Islamic Republic of); Venkateswara-Rao, K. [Center for Nanoscience and Technology, IST, Jawaharlal Nehru Technological University Hyderabad, Hyderabad 500 085, Andhra Pradesh (India)] [Center for Nanoscience and Technology, IST, Jawaharlal Nehru Technological University Hyderabad, Hyderabad 500 085, Andhra Pradesh (India)

2012-11-15T23:59:59.000Z

103

Manufacture of YBCO Superconducting Flexible Tapes from Nanoparticle Films Derived from Sedimentation and by Flame Deposition of Nanoparticles from Solution  

SciTech Connect

The objective of this CRADA was to develop the experimental and theoretical basis of a technology to produce yttrium barium copper oxide (YBCO) superconducting flexible tapes derived from nanoparticle metal oxide sols. The CRADA was a joint effort between Oxford Superconducting Technology, Brookhaven National Laboratory and Karpov Institute of Physical Chemistry. The effort was divided into three main tasks, the synthesis of a heteroepitaxial oxide buffer layer, and the manufacture of a flexible biaxially textured metallic substrate and the synthesis of a heteroepitaxial crystalline YBCO layer. The formation of a heteroepitaxial buffer layer was implemented using technology developed at the Karpov Institute of Physical Chemistry for the synthesis, stabilization and deposition of polymer stabilized nanoparticle metal oxide sols. Using this technology, flexible oriented RABiTS nickel tapes, manufactured and supplied by the CRADA partner, Oxford Superconducting Technology, Carteret, New Jersey, were coated with a film of metal oxide nanoparticles. After coating the RABiTS nickel tapes with the nanoparticle sols the nickel tape/nanoparticle composite structure was sintered in order to form a dense crystalline heteroepitaxial oxide layer on the surface of the tape, also known as a buffer layer. The final phase of the research was the formation of a heteroepitaxial YBCO layer, grown on top of the metal oxide buffer layer. This work was scheduled to follow the development of the heteroepitaxial oxide buffer layer as described above. Three different polymer stabilized sols, yttrium hydroxide, Y(OH){sub 3}, copper hydroxide, Cu(OH){sub 2}, and barium fluoride, BaF{sub 2}, were synthesized and combined in the appropriate stoichiometric ratio. This metal oxide sol was then be deposited onto the buffer layer and reacted to form a crystalline heteroepitaxial YBCO film ranging from 15 microns thick.

Wiesmann, Harold

2008-02-24T23:59:59.000Z

104

Process Of Bonding Copper And Tungsten  

DOE Patents (OSTI)

Process for bonding a copper substrate to a tungsten substrate by providing a thin metallic adhesion promoting film bonded to a tungsten substrate and a functionally graded material (FGM) interlayer bonding the thin metallic adhesion promoting film to the copper substrate. The FGM interlayer is formed by sintering a stack of individual copper and tungsten powder blend layers having progressively higher copper content/tungsten content, by volume, ratio values in successive powder blend layers in a lineal direction extending from the tungsten substrate towards the copper substrate. The resulting copper to tungsten joint well accommodates the difference in the coefficient of thermal expansion of the materials.

Slattery, Kevin T. (St. Charles, MO); Driemeyer, Daniel E. (Manchester, MO); Davis, John W. (Ballwin, MO)

2000-07-18T23:59:59.000Z

105

Dendrimer-encapsulated metal nanoparticle thin films on solid surfaces: preparation, characterization, and applications to electrocatalysis  

E-Print Network (OSTI)

Dendrimer-encapsulated nanoparticles (DENs) were prepared, characterized, and immobilized on solid surfaces. The resulting films were applied as electrocatalysts for the oxygen reduction reaction (ORR). First, the synthesis, physical and chemical...

Ye, Heechang

2009-05-15T23:59:59.000Z

106

Understanding Atom Probe Tomography of Oxide-Supported Metal Nanoparticles by Correlation with Atomic Resolution Electron Microscopy and Field Evaporation Simulation  

SciTech Connect

Metal-dielectric composite materials, specifically metal nanoparticles supported on or embedded in metal oxides, are widely used in catalysis. The accurate optimization of such nanostructures warrants the need for detailed three-dimensional characterization. Atom probe tomography is uniquely capable of generating sub-nanometer structural and compositional data with part-per-million mass sensitivity, but there are reconstruction artifacts for composites containing materials with strongly differing fields of evaporation, as for oxide-supported metal nanoparticles. By correlating atom probe tomography with scanning transmission electron microscopy for Au nanoparticles embedded in an MgO support, deviations from an ideal topography during evaporation are demonstrated directly, and correlated with compositional errors in the reconstructed data. Finite element simulations of the field evaporation process confirm that protruding Au nanoparticles will evolve on the tip surface, and that evaporation field variations lead to an inaccurate assessment of the local composition, effectively lowering the spatial resolution of the final reconstructed dataset. Cross-correlating the experimental data with simulations results in a more detailed understanding of local evaporation aberrations during APT analysis of metal-oxide composites, paving the way towards a more accurate three-dimensional characterization of this technologically important class of materials.

Devaraj, Arun; Colby, Robert J.; Vurpillot, F.; Thevuthasan, Suntharampillai

2014-03-26T23:59:59.000Z

107

Transport, Targeting, and Applications of Metallic Functional Nanoparticles for Degradation of DNAPL Chlorinated Organic Solvents  

SciTech Connect

Dense Non-Aqueous Phase Liquid (DNAPL) such as trichloroethylene act as long term sources of groundwater contaminants and are difficult and expensive to remediate. DNAPL-contaminated sites are a significant financial liability for the Department of Energy and the private sector. The objective of this study was to engineer reactive Fe-based nanoparticles with specialized polymeric coatings to make them mobile in the subsurface and to provide them with an affinity for the DNAPL/water interface. The synthesis, characterization, and reactivity/mobility of the engineered particles, and a molecular dynamic model that predicts their behavior at the DNPAL/water interface are described in this report.

Gregory V. Lowry; Sara Majetich; Krzysztof Matyjaszewski; David Sholl; Robert Tilton

2006-12-27T23:59:59.000Z

108

Copper-free click chemistry as an emerging tool for the programmed ligation of DNA-functionalised gold  

E-Print Network (OSTI)

Copper-free click chemistry as an emerging tool for the programmed ligation of DNA-modified gold nanoparticles using copper-free click chemistry. Gold nanoparticles functionalized with a discrete of the copper-free, `click-ligation' method allows for its universal applicability and opens up new avenues

Zheludev, Nikolay

109

Experimental and Computational Evidence of MetalO2 Activation and Rate-Limiting Proton-Coupled Electron Transfer in a Copper  

E-Print Network (OSTI)

-Coupled Electron Transfer in a Copper Amine Oxidase Yi Liu, Arnab Mukherjee, Nadav Nahumi, Mehmet Ozbil,§ Doreen 33146, United States *S Supporting Information ABSTRACT: The mechanism of O2 reduction by copper amine of copper amine oxidases, O2 reduction to H2O2 is physiologically significant,17 serving diverse functions

Roth, Justine P.

110

Introducing Green and Nongreen Aspects of Noble Metal Nanoparticle Synthesis: An Inquiry-Based Laboratory Experiment for Chemistry and Engineering Students  

Science Journals Connector (OSTI)

Introducing Green and Nongreen Aspects of Noble Metal Nanoparticle Synthesis: An Inquiry-Based Laboratory Experiment for Chemistry and Engineering Students ... (5) For example, one of the most widely used fabrication methods for colloidal AgNPs and AuNPs involves the high temperature, energy consuming reduction of silver nitrate (by LeeMeisel(6, 7)) and tetrachloroauric acid (by Turkevich(8, 9)), respectively, by trisodium citrate. ...

Sesha L. A. Paluri; Michelle L. Edwards; Nhi H. Lam; Elizabeth M. Williams; Allie Meyerhoefer; Ioana E. Pavel Sizemore

2014-10-29T23:59:59.000Z

111

Process Of Bonding Copper And Tungsten  

DOE Patents (OSTI)

Process for bonding a copper substrate to a tungsten substrate by providing a thin metallic adhesion promoting film bonded to a tungsten substrate and a functionally graded material (FGM) interlayer bonding the thin metallic adhesion promoting film to the copper substrate. The FGM interlayer is formed by thermal plasma spraying mixtures of copper powder and tungsten powder in a varied blending ratio such that the blending ratio of the copper powder and the tungsten powder that is fed to a plasma torch is intermittently adjusted to provide progressively higher copper content/tungsten content, by volume, ratio values in the interlayer in a lineal direction extending from the tungsten substrate towards the copper substrate. The resulting copper to tungsten joint well accommodates the difference in the coefficient of thermal expansion of the materials.

Slattery, Kevin T. (St. Charles, MO); Driemeyer, Daniel E. (Manchester, MO)

1999-11-23T23:59:59.000Z

112

Plasmonic Dye-Sensitized Solar Cells Using Core?Shell Metal?Insulator Nanoparticles  

Science Journals Connector (OSTI)

Our spectroscopic investigation indicates that plasmon-enhanced photocarrier generation competes well with plasmons oscillation damping with in the first tens of femtoseconds following light absorption. ... The spectral response was measured using a 250 W xenon lamp filtered by a Princeton Instruments monochromator coupled to a Keithley 2636, both controlled by Labview and calibrated against a UV enhanced silicon reference diode. ... Probably in the same way as a laser generates stimulated emission of coherent photons, a spaser' could generate stimulated emission of surface plasmons (oscillations of free electrons in metallic nanostructures) in resonating metallic nanostructures adjacent to a gain medium. ...

Michael D. Brown; Teeraporn Suteewong; R. Sai Santosh Kumar; Valerio DInnocenzo; Annamaria Petrozza; Michael M. Lee; Ulrich Wiesner; Henry J. Snaith

2010-12-31T23:59:59.000Z

113

Formation and dissolution of copper-based nanoparticles in SiO{sub 2} sol-gel film using heat treatment and/or UV light exposure  

SciTech Connect

We report in this paper, results on the formation and dissolution of Cu-based nanoparticles in sol-gel SiO{sub 2} thin films using heat treatment and UV light exposure, respectively. Using UV-vis-NIR spectroscopy, we have shown that Cu{sub 2}O nanoparticles can be generated by controlling the aging of the sol prior to film deposition while the Cu{sup 0} nanoparticles can be synthesized using a heat treatment in H{sub 2} atmosphere at 550 deg. C for 6 h. It has been also demonstrated that irradiation with an UV pulsed (Q-switched Nd:YAG) or continuous black ray UV lamp can dissolve these Cu-based nanoparticles with controlled, spatial selectivity. The mechanism of the dissolution process was found to be mainly thermal. Finally, we report a new analytical technique for detecting/confirming the presence of low densities of Cu nanoparticles in the films, based on a relative heat flow measurement of such films using a micro-thermal analyzer (e.g., TA Instruments {mu}TA model 2990)

Massera, J. [School of Materials Science and Engineering, Clemson University, Clemson, SC 29634 (United States)], E-mail: massera@clemson.edu; Choi, J. [College of Optics, Center for Research and Education in Optics and Lasers (CREOL), University of Central Florida, 4000 Central Florida Boulevard, Orlando, FL 32816 (United States); Petit, L. [School of Materials Science and Engineering, Clemson University, Clemson, SC 29634 (United States); Richardson, M. [College of Optics, Center for Research and Education in Optics and Lasers (CREOL), University of Central Florida, 4000 Central Florida Boulevard, Orlando, FL 32816 (United States); Obeng, Y. [Nkanea Technologies, Inc., 6440 Aylworth Drive, Frisco, TX 75035 (United States); Richardson, K. [School of Materials Science and Engineering, Clemson University, Clemson, SC 29634 (United States)

2008-11-03T23:59:59.000Z

114

Enhancement of Perovskite-Based Solar Cells Employing CoreShell Metal Nanoparticles  

Science Journals Connector (OSTI)

(15, 16) In addition, the absorption spectrum of the active layer in the device is potentially tunable by adjusting the size and shape of metal NPs introducing prospects for color tuning for aesthetic demands in building integrated photovoltaics (BIPV). ... building integrated photovoltaics ...

Wei Zhang; Michael Saliba; Samuel D. Stranks; Yao Sun; Xian Shi; Ulrich Wiesner; Henry J. Snaith

2013-08-15T23:59:59.000Z

115

Apoferritin-Templated Synthesis of Encoded Metallic Phosphate...  

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

Apoferritin-Templated Synthesis of Encoded Metallic Phosphate Nanoparticle Tags. Apoferritin-Templated Synthesis of Encoded Metallic Phosphate Nanoparticle Tags. Abstract: Encoded...

116

Dispersion strengthened copper  

DOE Patents (OSTI)

A composition of matter comprised of copper and particles which are dispersed throughout the copper, where the particles are comprised of copper oxide and copper having a coating of copper oxide, and a method for making this composition of matter.

Sheinberg, Haskell (Los Alamos, NM); Meek, Thomas T. (Knoxville, TN); Blake, Rodger D. (Santa Fe, NM)

1990-01-01T23:59:59.000Z

117

Dispersion strengthened copper  

DOE Patents (OSTI)

A composition of matter comprised of copper and particles which are dispersed throughout the copper, where the particles are comprised of copper oxide and copper having a coating of copper oxide, and a method for making this composition of matter.

Sheinberg, Haskell (Los Alamos, NM); Meek, Thomas T. (Knoxville, TN); Blake, Rodger D. (Santa Fe, NM)

1989-01-01T23:59:59.000Z

118

It's Elemental - The Element Copper  

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

Nickel Nickel Previous Element (Nickel) The Periodic Table of Elements Next Element (Zinc) Zinc The Element Copper [Click for Isotope Data] 29 Cu Copper 63.546 Atomic Number: 29 Atomic Weight: 63.546 Melting Point: 1357.77 K (1084.62°C or 1984.32°F) Boiling Point: 2835 K (2562°C or 4644°F) Density: 8.933 grams per cubic centimeter Phase at Room Temperature: Solid Element Classification: Metal Period Number: 4 Group Number: 11 Group Name: none What's in a name? From the Latin word cuprum, which means "from the island of Cyprus." Say what? Copper is pronounced as KOP-er. History and Uses: Archaeological evidence suggests that people have been using copper for at least 11,000 years. Relatively easy to mine and refine, people discovered methods for extracting copper from its ores at least 7,000 years ago. The

119

Block Copolymer Templated Chemistry for the Formation of Metallic Nanoparticle Arrays on Semiconductor Surfaces  

Science Journals Connector (OSTI)

One of key ingredients for many future applications is the ability to precisely pattern nanoscale features on technologically relevant semiconductor surfaces such as silicon and germanium, as well as compound semiconductors such as gallium arsenide and indium phosphide. ... Deposition of these metals is possible presumably due to the water solubility of their oxides:? Ge oxide,14c As oxide,24 and P oxide25 are soluble in water. ...

Masato Aizawa; Jillian M. Buriak

2007-09-25T23:59:59.000Z

120

Bell beaker copper use in central Europe: a distinctive tradition? A re-evaluation of the composition of copper artefacts and its effects on the properties of the metal  

E-Print Network (OSTI)

This thesis is concerned with the manufacture of copper artefacts by the users of Bell Beaker pottery in the Eastern Bell Beaker group in central Europe, and addresses the question: did these metalworkers have distinct ...

Merkl, Matthias Bernd

2010-11-24T23:59:59.000Z

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121

Determining the Behavior of RuO(x) Nanoparticles in Mixed-Metal Oxides:  

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

Mechanism of Ethanol Synthesis from Syngas on Rh(111) Understanding of Mechanism of Ethanol Synthesis from Syngas on Rh(111) Understanding of ethanol decomposition on Rh(1 1 1) from density functional theory and kinetic Monte Carlo simulations Theoretical perspective of alcohol decomposition and synthesis from CO2 hydrogenation