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Topic Area: Nanomaterials

Displaying records 81 to 90 of 152 records.
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81. Compressive stress effect on the radial elastic modulus of oxidized Si nanowires
Topic: Nanomaterials
Published: 3/23/2010
Authors: Gheorghe Stan, Sergiy Krylyuk, Albert Davydov, Robert Francis Cook
Abstract: Detailed understanding and optimal control of the properties of Si nanowires are essential steps in developing Si nanoscale circuitry. In this work, we have investigated mechanical properties of as-grown and oxidized Si nanowires as a function of the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904727

82. Analysis of Au Nanoparticles by Electrospray Differential Mobility Analysis (ES-DMA)
Topic: Nanomaterials
Published: 3/1/2010
Author: Rebecca A Zangmeister
Abstract: This document describes a protocol for size analysis of citrate stabilized gold nanoparticles of nominally 10 nm, 30 nm, and 60 nm sizes using electrospray differential mobility analysis (ES-DMA).  Nanoparticles are centrifuged to remove excess ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832212

83. In-situ Kinetics Studies on Hydrogenation of Transition Metal (=Ti, Fe) Doped Mg Films
Topic: Nanomaterials
Published: 3/1/2010
Authors: Zhuopeng Tan, Edwin J Heilweil, Leonid A Bendersky
Abstract: In this paper we report on kinetics studies on growth rates of a hydride phase during metal-hydride phase transformation of Mg films doped with transition metals (=Ti, Fe). Infrared imaging of wedge-shaped thin films during hydrogen loading reveals d ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904735

84. Measuring the Size of Nanoparticles Using Transmission Electron Microscopy (TEM)
Topic: Nanomaterials
Published: 3/1/2010
Authors: John E Bonevich, Wolfgang K. Haller
Abstract: This assay protocol outlines procedures for sample preparation and the determination of mean nanoparticle size (in projection) using transmission electron microscopy (TEM). The projected diameter is the diameter of an equivalent hard uniform sphere s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854083

85. Challenges in Continuum Modeling of Intergranular Fracture
Topic: Nanomaterials
Published: 2/11/2010
Authors: Valerie R. Coffman, James P. Sethna
Abstract: Intergranular fracture in polycrystals is often simulated by finite elements coupled to a cohesive-zone model for the interfaces, requiring cohesive laws for grain boundaries as a function of their geometry. We discuss three challenges in understandi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903627

86. Applications of Thermogravimetric Analysis in Quality Control of Single-Walled Carbon Nanotubes
Topic: Nanomaterials
Published: 2/1/2010
Authors: Elisabeth Mansfield, Aparna Kar, Stephanie A Hooker
Abstract: Carbon nanotube exhibit a range of chemistries, including mixtures of different nanotube diameters, lengths and chiralities, coupled with various concentrations of metallic and non-nanotube carbon impurities. The performance of a given material for ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903419

87. Laser Patterning of Diamond. Part II. Surface Nondiamond Carbon Formation and its Removal
Topic: Nanomaterials
Published: 12/30/2009
Authors: Daniel A Fischer, John Smedley, Trvini Rao, Cherno Jaye, Jen Bohon
Abstract: As diamond becomes more prevalent for electronic and research applications, methods of patterning diamond will be required. One such method, laser ablation, has been investigated in a related work.1 We report on the formation of surface non-diamond c ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902382

88. Size Measurement of Nanoparticles using Atomic Force Microscopy
Topic: Nanomaterials
Published: 10/1/2009
Authors: Jaroslaw Grobelny, Frank W DelRio, Pradeep Narayanan Namboodiri, Doo-In Kim, Vincent A Hackley, Robert Francis Cook
Abstract: In this assay protocol, procedures for dispersing gold nanoparticles on various surfaces such that they are suitable for imaging and height measurement via intermittent contact mode AFM are first described. The procedures for AFM calibration and ope ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854085

89. Optical Properties of Rod-like Metallic Nanostructures: Insight from Theory and Experiment
Topic: Nanomaterials
Published: 9/3/2009
Authors: Jinsong Duan, Kyoungweon Park, Robert I. MacCuspie, Richard A Vaia, Ruth Pachter
Abstract: In this work, we combined synthesis of metal Au and Au-Ag core-shell NRs, of high-purity and for a broad range of NR aspect ratios, with theoretical prediction, in order to gain an understanding of the optical response. Self-assembled NRs were also ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902067

90. Origin of Universal Optical Conductivity and Optical Stacking Sequence Identification in Multilayer Graphene
Topic: Nanomaterials
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



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