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Topic Area: Nanostructured Materials
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Displaying records 31 to 39.
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31. Comparison of Steric Effects in the Modeling of Spheres and Rodlike Particles in Field-Flow Fractionation (FFF)
Topic: Nanostructured Materials
Published: 2/27/2009
Authors: Frederick R Phelan Jr, Barry J. Bauer
Abstract: The elution of spheres and rods in field-flow fractionation is studied using a Brownian dynamics method. The particle motions for spheres are governed by a familiar Langevin equation which models drag force and diffusion. The rods are modeled as prol ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852788

32. Transmission electron microscopy characterization of colloidal copper nanoparticles and their chemical reactivity
Topic: Nanostructured Materials
Published: 2/16/2009
Authors: Guangjun Cheng, Angela R Hight Walker
Abstract: A colloidal synthesis route was developed to produce face-centered cubic (fcc) copper (Cu) nanoparticles in the presence of the surfactants in an organic solvent under an argon environment. Various synthetic conditions have been explored to control t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903450

33. Simulation of Nanotube Separation in Field-Flow Fractionation (FFF)
Topic: Nanostructured Materials
Published: 4/27/2007
Authors: Frederick R Phelan Jr, Barry J. Bauer
Abstract: A Brownian dynamics simulation of prolate ellipsoidal particles is developed to investigate the separation of nanotubes in flow-FFF. The particle motions are governed by stochastic forms of a linear momentum balance with orientation dependent drag an ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852686

34. Characterization and Surface-Reactivity of Nanocrystalline Anatase in Aqueous Solutions
Topic: Nanostructured Materials
Published: 12/19/2006
Authors: Moira K Ridley, Vincent A Hackley, Michael L Machesky
Abstract: The chemical and electrostatic interactions at mineral- water interfaces are of fundamental importance in many geochemical, materials science, and technological processes; however, the effects of particle size at the nanoscale on these interactions a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854317

35. Structure Development in Aerogel-Processed Nanocrystalline Alkaline-Earth Oxides as Revealed by SANS
Topic: Nanostructured Materials
Published: 8/1/2005
Authors: Vincent A Hackley, P K Stoimenov, D L Ho, Li Piin Sung, K J Klabunde
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850837

36. Rheological and Electrokinetic Behavior Associated with Concentrated Nanosize Silica Hydrosols
Topic: Nanostructured Materials
Published: 5/1/2005
Authors: J Y Kim, U Paik, Vincent A Hackley
Abstract: We report that concentrated fumed silica nanosols exhibit anomalous rheology with regards to predictions based on DLVO theory. Despite a high electrokinetic potential at pH 8, fumed silica not only exhibits rheologicl behavior normally indicative of ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850762

37. Ferroelectric Phase Transitions in Nano-Scale Chemically Ordered PbSc^d0.5^Nb^d0.5^O^d3^ Using a First-Principles Model Hamiltonian
Topic: Nanostructured Materials
Published: 7/1/2003
Authors: U Waghmare, Eric J Cockayne, Benjamin P Burton
Abstract: fects of chemical order, disorder, short range order, and anti-phase boundaries on phase transitions and dielectric properties of PBSc^d1/2^Nb^d1/2^O^d3^ are studied through molecular dynamics simulations of a FP model. Simulations of large systems ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850670

38. Microwave Dielectric Characterization of Polyaniline Composites
Topic: Nanostructured Materials
Published: 1/1/2000
Authors: Jan Obrzut, C. K. Chiang
Abstract: Dielectric permittivity of polyaniline (emerdaline salt) and its dispersions in epoxy glasses have been investigated in the frequency rangebetween 1 GHz to 18 GHz by using the reflection - transmission method. The observed high value of the dielectri ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851568

39. Unconventional structure-assisted laser trapping of high-index nanowires in liquid crystals
Topic: Nanostructured Materials
Published: Date unknown
Authors: Kristine A Bertness, David Engstrom, Michael C. M. Varney, Martin Persson, Rahul P. Trivedi, Mattias Goksor, Ivan I. Smalyukh
Abstract: Stable optical trapping and manipulation of high-index particles in low-index host media is often impossible due to the dominance of scattering forces over gradient forces. Here we explore optical trapping in liquid crystalline structured hosts and s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910451



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