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Topic Area: Nanostructured Materials
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Displaying records 21 to 30 of 41 records.
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21. Origin of Universal Optical Conductivity and Optical Stacking Sequence Identification in Multilayer Graphene
Topic: Nanostructured Materials
Published: 8/6/2009
Authors: Hongki Min, Allan H. MacDonald
Abstract: We predict that the optical conductivity of normal graphene multilayers is close to {sigma}^duni^=({pi}/2) e^u2^/h per layer over a broad range of frequencies. The origin of this behavior is an emergent chiral symmetry which is present in normal N-l ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902107

22. Relative Photon-to-Carrier Efficiencies of Alternating Nanolayers of Zinc Phthalocyanine and C60 Multilayer Films Assessed by Time-Resolved Terahertz Spectroscopy
Topic: Nanostructured Materials
Published: 10/1/2009
Authors: Okan Esenturk, Joseph S Melinger, Paul A. Lane, Edwin J Heilweil
Abstract: Alternating multi-layer and 1:1 blended films of zinc phthalocyanine (ZnPc)and buckminsterfullerene (C60) were investigated as model active layers for solar cells by Time-Resolved Terahertz Spectroscopy (TRTS). Relative photon-to-carrier efficiencies ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902140

23. Report on an Interlaboratory Study for the Measurement of BET-Specific Surface Area using an Industrially Relevant TiO2 Nanopowder
Topic: Nanostructured Materials
Published: 8/3/2011
Author: Vincent A Hackley
Abstract: This report summarizes the findings of an interlaboratory study (ILS) conducted in 2009-2010 under the auspices of the Versailles Project on Advanced Materials and Standards (VAMAS) Technical Working Area (TWA) 34 (Nanoparticle Populations). The stat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908638

24. Resonant Microwave Absorption in Thermally Deposited Au Nanoparticle Films Near Percolation Coverage
Topic: Nanostructured Materials
Published: 6/19/2013
Authors: Jan Obrzut, Jack F Douglas, Oleg A Kirillov, Fred Sharifi, James Alexander Liddle
Abstract: We observe a resonant transition in microwave absorption in thin thermally deposited Au nanoparticle films near the geometrical percolation transition pc where the films exhibit a ,fractal‰ heterogeneous geometry. The absorption of incident microwa ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912786

25. Revealing the Interphase in Polymer Nanocomposites
Topic: Nanostructured Materials
Published: 3/16/2011
Authors: Mauro Zammarano, Paul Hutsell Maupin, Li Piin Sung, Jeffrey W Gilman, Douglas Matthew Fox
Abstract: Morphological characterization of polymer nanocomposites is a fundamental challenge that is complicated by multiple length scales. Here, we report a technique for high-throughput monitoring of interphase and dispersion in polymer nanocomposites based ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906284

26. 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

27. Silicon Carbide Nanostructures: A Tight Binding Approach
Topic: Nanostructured Materials
Published: 6/28/2009
Authors: Anthony D. Patrick, Xiao Dong, Thomas C Allison, Estela Blaisten-Barojas
Abstract: A tight-binding model Hamiltonian is newly parametrized for silicon carbide based on fits to a database of energy points calculated within the density functional theory approach of the electronic energy surfaces of nanoclusters and the total en ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904026

28. 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

29. Steering Acoustically Propelled Nanowire Motors towards Cells in a Biologically Compatible Environment using Magnetic Fields
Topic: Nanostructured Materials
Published: 12/10/2013
Authors: Suzanne Ahmed, Wei Wang, Lamar O. Mair, Robert D. Fraleigh, Sixing Li, Luz Angelica Castro, Mauricio Hoyos, Tony Jun Huang, Thomas E. Mallouk
Abstract: The recent discovery of fuel-free propulsion of nanomotors using acoustic energy has provided a new avenue for using nanomotors in biocompatible media. Crucial to the application of nanomotors in biosensing and biomedical applications is the ability ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914385

30. Storage Wars: How citrate capped silver nanoparticle suspensions are affected by not-so-trivial decisions
Topic: Nanostructured Materials
Published: 3/21/2014
Authors: Justin M Gorham, Anne B Rohlfing, Katrice A Lippa, Robert I. MacCuspie, Amy Hemmati, Richard D Holbrook
Abstract: A critical but often overlooked component of silver nanoparticle (AgNPs) suspensions involves their behavior following short- and long-term storage. The current study investigates the integrity of citrate-capped AgNP suspensions, nominally 20 nm in ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913638



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