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in subjects: "Nanoparticles"  
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Determination of critical length scales for corrosion processes using microelectroanalytical techniques.

Description: A key factor in our ability to produce and predict the stability of metal-based macro- to nano-scale structures and devices is a fundamental understanding of the localized nature of corrosion. Corrosion processes where physical dimensions become critical in the degradation process include localized corrosion initiation in passivated metals, microgalvanic interactions in metal alloys, and localized corrosion in structurally complex materials like nanocrystalline metal films under atmospheric and… more
Date: March 1, 2004
Creator: Zavadil, Kevin Robert & Wall, Frederick Douglas
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

"Nanotechnology Enabled Advanced Industrial Heat Transfer Fluids"

Description: ABSTRACT Nanotechnology Enabled Advanced industrial Heat Transfer Fluids” Improving the efficiency of Industrial Heat Exchangers offers a great opportunity to improve overall process efficiencies in diverse industries such as pharmaceutical, materials manufacturing and food processing. The higher efficiencies can come in part from improved heat transfer during both cooling and heating of the material being processed. Additionally, there is great interest in enhancing the performance and reducin… more
Date: June 12, 2008
Creator: Skandan, Dr. Ganesh; Singhal, Dr. Amit; Eberts, Mr. Kenneth; Sobrevilla, Mr. Damian; Shan, Prof. Jerry; Tse, Stephen et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Photodeposition of Pt on Colloidal CdS and CdSe/CdS Semiconductor Nanostructures

Description: Semiconductor photocatalysis has been identified as a promising avenue for the conversion of solar energy into environmentally friendly fuels, most notably by the production of hydrogen from water.[1-5] Nanometer-scale materials in particular have attracted considerable scientific attention as the building blocks for light-harvesting applications.[6,7] Their desirable attributes include tunability of the optical properties with size, amenability to relatively inexpensive low-temperature process… more
Date: August 6, 2008
Creator: Dukovic, Gordana; Merkle, Maxwell G.; Nelson, James H.; Hughes, Steven M. & Alivisatos, A. Paul
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Surface Bonding Effects in Compound Semiconductor Nanoparticles: II

Description: Small nanoparticles have a large proportion of their atoms either at or near the surface, and those in clusters are essentially all on the surface. As a consequence, the details of the surface structure are of paramount importance in governing the overall stability of the particle. Just as with bulk materials, factors that determine this stability include “bulk” structure, surface reconstruction, charge balance and hybridization, ionicity, strain, stoichiometry, and the presence of adsorbates. … more
Date: July 1, 2008
Creator: Farrell, Helen H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Plasma Synthesis of Nanoparticles for Nanocomposite Energy Applications

Description: The nanocomposite energy applications for plasma reactor produced nanoparticles are reviewed. Nanoparticles are commonly defined as particles less than 100 nm in diameter. Due to this small size, nanoparticles have a high surface-to-volume ratio. This increases the surface energy compared to the bulk material. The high surface-to-volume ratio and size effects (quantum effects) give nanoparticles distinctive chemical, electronic, optical, magnetic and mechanical properties from those of the bulk… more
Date: September 1, 2008
Creator: Kong, Peter C. & Kawczak, Alex W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Gel Electrophoresis of Gold-DNA Nano-Conjugates

Description: Single stranded DNA of different lengths and different amounts was attached to colloidal phosphine stabilized Au nanoparticles. The resulting conjugates were investigated in detail by a gel electrophoresis study based on 1200 gels. We demonstrate how these experiments help to understand the binding of DNA to Au particles. In particular we compare specific attachment of DNA via gold-thiol bonds with nonspecific adsorption of DNA. The maximum number of DNA molecules that can be bound per particle… more
Date: January 10, 2006
Creator: Pellegrino, T.; Sperling, R. A.; Alivisatos, A. P. & Parak, W. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Protein-Nanocrystal Conjugates Support a Single Filament Polymerization Model in R1 Plasmid Segregation

Description: To ensure inheritance by daughter cells, many low-copy number bacterial plasmids, including the R1 drug-resistance plasmid, encode their own DNA segregation systems. The par operon of plasmid R1 directs construction of a simple spindle structure that converts free energy of polymerization of an actin-like protein, ParM, into work required to move sister plasmids to opposite poles of rod-shaped cells. The structures of individual components have been solved, but little is known about the ultrast… more
Date: July 15, 2008
Creator: Choi, Charina L.; Claridge, Shelley A.; Garner, Ethan C.; Alivisatos, A. Paul & Mullins, R. Dyche
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Final Report: Thermal Conductance of Solid-Liquid Interfaces

Description: Research supported by this grant has significantly advanced fundamental understanding of the thermal conductance of solid-liquid interfaces, and the thermal conductivity of nanofluids and nanoscale composite materials. • The thermal conductance of interfaces between carbon nanotubes and a surrounding matrix of organic molecules is exceptionally small and this small value of the interface conductance limits the enhancement in thermal conductivity that can be achieved by loading a fluid or a poly… more
Date: May 31, 2006
Creator: Cahil, David, G. & Braun, Paul, V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Structural Distortions in 5-10 Nm Silver Nanoparticles Under High Pressure

Description: We present experimental evidence that silver nanoparticles in the size range of 5-10 nm undergo a reversible structural transformation under hydrostatic pressures up to 10 GPa. We have used x-ray diffraction with a synchrotron light source to investigate pressure-dependent and size-dependent trends in the crystal structure of silver nanoparticles in a hydrostatic medium compressed in a diamond-anvil cell. Results suggest a reversible linear pressure-dependent rhombohedral distortion which has n… more
Date: October 13, 2008
Creator: Koski, Kristie J.; Kamp, Noelle M.; Kunz, Martin; Knight, Jason K.; Alivisatos, A. P. & Smith, R. K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Quasi-ternary nanoparticle superlattices through nanoparticle design

Description: Individual nanoscale building blocks exhibit a wide range of size-dependent properties, since their size can be tuned over known characteristic length scales of bulk materials. In the last several years, the possibility of combining different materials in the form of two and three component nanoparticles (NPs) has been extensively explored. Also multi-component materials can be obtained via self-assembly of NPs from their binary colloidal mixtures. These new nanocrystal solids may possess tunab… more
Date: June 19, 2007
Creator: Kortright, Jeffrey; Shevchenko, Elena V.; Kortright, Jeffrey B.; Talapin, Dmitri V.; Aloni, Shaul & Alivisatos, A. Paul
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Catalytic Activity of Supported Metal Particles for Sulfuric Acid Decomposition Reaction

Description: Production of hydrogen by splitting water in thermochemical water-splitting cycles, such as the sulfur-based group that employs the catalytic decomposition of sulfuric acid into SO2 and O2 is of considerable interest. Most of these processes occur at high temperatures (T = 1,000 K) and exposes catalysts to the extreme conditions such as steam, oxygen, and acid vapor that severely damage these catalysts within a short time. To develop an understanding of the factors that cause catalyst deactivat… more
Date: August 1, 2007
Creator: Rashkeev, Sergey N.; Ginosar, Daniel M.; Petkovic, Lucia M. & Farrell, Helen H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Unconventional Magnetism in Low Carrier Density Systems and Nanoparticle Composites

Description: Under the auspices of this funding, we have developed a program to synthesize and characterize highly monodispersed magnetic nanoparticles. We have been particularly interested in the origin of the exchange bias effect, which occurs in compound nanoparticles with a ferromagnetic core and an antiferromagnetic shell, and have mostly focused on Co/CoO core-shell nanoparticles. The exchange bias effect involves exchange coupling between the core moment and the antiferromagnetic shell which stabiliz… more
Date: June 14, 2008
Creator: Aronson, Meigan C
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

NREL Paves the Way to Commercialization of Silicon Ink (Fact Sheet)

Description: In 2008, Innovalight, a start-up company in Sunnyvale, California, invented a liquid form of silicon, called Silicon Ink. It contains silicon nanoparticles that are suspended evenly within the solution. Those nanoparticles contain dopant atoms that can be driven into silicon solar cells, which changes the conductivity of the silicon and creates the internal electric fields that are needed to turn photons into electrons -- and thus into electricity. The ink is applied with a standard screen prin… more
Date: April 1, 2012
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

NREL Scientists Reveal Origin of Diverse Melting Behaviors of Aluminum Nanoclusters (Fact Sheet)

Description: Research reveals active role of cluster symmetries on the size-sensitive, diverse melting behaviors of metallic nanoclusters, providing insight to understanding phase changes of nanoparticles for thermal energy storage. Unlike macroscopic bulk materials, intermediate-sized nanoclusters with around 55 atoms inherently exhibit size-sensitive melting changes: adding just a single atom to a nanocluster can cause a dramatic change in melting behavior. Microscopic understanding of thermal behaviors o… more
Date: October 1, 2011
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Multimodality Imaging with Silica-Based Targeted Nanoparticle Platforms

Description: Objectives: To synthesize and characterize a C-Dot silica-based nanoparticle containing 'clickable' groups for the subsequent attachment of targeting moieties (e.g., peptides) and multiple contrast agents (e.g., radionuclides with high specific activity) [1,2]. These new constructs will be tested in suitable tumor models in vitro and in vivo to ensure maintenance of target-specificity and high specific activity. Methods: Cy5 dye molecules are cross-linked to a silica precursor which is reacted … more
Date: April 9, 2012
Creator: Lewis, Jason S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Selective Electrocatalytic Activity of Ligand Stabilized Copper Oxide Nanoparticles

Description: 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 liga… more
Date: January 1, 2011
Creator: Kauffman, Douglas R.; Ohodnicki, Paul R.; Kail, Brian W & Matranga, Christopher
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Spectroscopic Evidence for Exceptional Thermal Contribution to Electron-Beam Induced Fragmentation

Description: While electron beam induced fragmentation (EBIF) has been reported to result in the formation of nanocrystals of various compositions, the physical forces driving this phenomenon are still poorly understood. We report EBIF to be a much more general phenomenon than previously appreciated, operative across a wide variety of metals, semiconductors and insulators. In addition, we leverage the temperature dependent bandgap of several semiconductors to quantify -- using in situ cathodoluminescence sp… more
Date: November 16, 2010
Creator: Caldwell, Marissa A.; Haynor, Ben; Aloni, Shaul; Ogletree, D. Frank; Wong, H.-S. Philip; Urban, Jeffrey J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Room-temperature Formation of Hollow Cu2O Nanoparticles

Description: Monodisperse Cu and Cu2O nanoparticles (NPs) are synthesized using tetradecylphosphonic acid as a capping agent. Dispersing the NPs in chloroform and hexane at room temperature results in the formation of hollow Cu2O NPs and Cu@Cu2O core/shell NPs, respectively. The monodisperse Cu2O NPs are used to fabricate hybrid solar cells with efficiency of 0.14percent under AM 1.5 and 1 Sun illumination.
Date: January 18, 2010
Creator: Hung, Ling-I; Tsung, Chia-Kuang; Huang, Wenyu & Yang, Peidong
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Characterization of fundamental catalytic properties of MoS2/WS2 nanotubes and nanoclusters for desulfurization catalysis - a surface temperature study

Description: The prior project consisted of two main project lines. First, characterization of novel nanomaterials for hydrodesulfurization (HDS) applications. Second, studying more traditional model systems for HDS such as vapor-deposited silica-supported Mo and MoSx clusters. In the first subproject, we studied WS2 and MoS2 fullerene-like nanoparticles as well as WS2 nanotubes. Thiophene (C4H4S) was used as the probe molecule. Interestingly, metallic and sulfur-like adsorption sites could be identified on… more
Date: July 5, 2012
Creator: Burghaus, U.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Magnetic domains and surface effects in hollow maghemite nanoparticles

Description: In the present work, we investigate the magnetic properties of ferrimagnetic and non-interacting maghemite hollow nanoparticles obtained by the Kirkendall effect. From the experimental characterization of their magnetic behavior, we find that polycrystalline hollow maghemite nanoparticles exhibit low blocked-to-superparamagnetic transition temperatures, small magnetic moments, significant coercivities and irreversibility fields, and no magnetic saturation on external magnetic fields up to 5 T. … more
Date: September 30, 2008
Creator: Cabot, Andreu; Alivisatos, A. Paul; Puntes, Victor; Balcells, Lluis; Iglesias, Oscar & Labarta, Amilcar
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Final Report DE-FG02-00ER54583: "Physics of Atmospheric Pressure Glow Discharges" and "Nanoparticle Nucleation and Dynamics in Low-Pressure Plasmas"

Description: This project was funded over two periods of three years each, with an additional year of no-cost extension. Research in the first funding period focused on the physics of uniform atmospheric pressure glow discharges, the second funding period was devoted to the study of the dynamics of nanometer-sized particles in plasmas.
Date: June 1, 2009
Creator: Kortshagen, Uwe; Heberlein, Joachim & Girshick, Steven L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department

Nanostructured Metal Oxide Anodes

Description: This summarizes NREL's FY09 battery materials research activity in developing metal oxide nanostructured anodes to enable high-energy, durable and affordable li-ion batteries for HEVs and PHEVs.
Date: May 1, 2009
Creator: Dillon, A. C.; Riley, L. A.; Lee, S. H.; Kim, Y. H.; Ban, C.; Gillaspie, D. T. et al.
Item Type: Refine your search to only Presentation
Partner: UNT Libraries Government Documents Department
open access

Probing the Conformational Distributions of Sub-Persistence Length DNA

Description: We have measured the bending elasticity of short double-stranded DNA (dsDNA) chains through small-angle X-ray scattering from solutions of dsDNA-linked dimers of gold nanoparticles. This method, which does not require exertion of external forces or binding to a substrate, reports on the equilibrium distribution of bending fluctuations, not just an average value (as in ensemble FRET) or an extreme value (as in cyclization), and in principle provides a more robust data set for assessing the suita… more
Date: June 8, 2009
Creator: Mastroianni, Alexander; Sivak, David; Geissler, Phillip & Alivisatos, Paul
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

LDRD final report on "controlled synthesis of nanocrystalline catalysts <U+2013> from solutions to supports".

Description: Control of nanoparticle size is crucial to the development of nanotechnology. At this point in time, no general, rational synthetic strategy for controlling nanocrystal diameters and producing narrow diameter distributions has emerged. This is a reflection of a poor understanding of the mechanisms for nanocrystal growth. Based on previous studies of bismuth and gold nanoparticle growth, this work clearly establishes two new synthetic approaches to controlled growth of colloidal Pt nanocrystals,… more
Date: December 1, 2006
Creator: Buhro, William E. (Washington University in St. Louis, St. Louis, MO); Richards, Vernal (Washington University in St. Louis, St. Louis, MO); Lattman, Micheal; Resler, Shawn P. (Washington University in St. Louis, St. Louis, MO) & Kemp, Richard Alan
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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