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Topic Area: Nanomaterials

Displaying records 71 to 80 of 147 records.
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71. Dynamic light scattering investigations of nanoparticle aggregation following a light-induced pH jump
Topic: Nanomaterials
Published: 5/19/2010
Authors: Ryan Murphy, Denis Pristinski, Kalman D Migler, Jack F Douglas, Vivek M Prabhu
Abstract: We use dynamic light scattering to characterize the kinetics of nanoparticle aggregation. The aggregation process was conveniently initiated in photoacid generator (PAG) solutions where changes in the pH of the solution can be controlled by exposure ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904974

72. Substrate Hybridization and Rippling of Graphene Evidenced by Near-Edge X-ray Absorption Fine Structure Spectroscopy
Topic: Nanomaterials
Published: 5/1/2010
Authors: Daniel A Fischer, V. J. Lee, Patrick S Lysaght, Sarbajit Banerjee
Abstract: Interfacial interactions at graphene/metal and graphene/dielectric interfaces are likely to profoundly influence the electronic structure of graphene. We present here the first angle-resolved near-edge X-ray absorption fine structure (NEXAFS) spectro ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905244

73. Excimer laser-based purification of single-walled carbon nanotubes
Topic: Nanomaterials
Published: 4/1/2010
Authors: Katie Hurst, Elisabeth Mansfield, Anne Dillon, John H Lehman
Abstract: Bulk purified carbon nanotube (CNT) material is essential for the realization of CNT applications including incorporating them into various composite materials. We have developed a laser-based purification technique for bulk single-walled carbon nano ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904499

74. Wrinkling and Strain Softening in Single-Wall Carbon Nanotube Membranes
Topic: Nanomaterials
Published: 3/26/2010
Authors: Erik K. Hobbie, Daneesh Olivia Simien, Jeffrey A Fagan, JiYeon Huh, Jun Y. Chung, Steven D Hudson, Jan Obrzut, Jack F Douglas, Christopher M Stafford
Abstract: Ultrathin layers of single-wall carbon nanotubes (SWCNTs) show considerable promise for applications ranging from fuel-cell membranes and biochemical sensors to bioactive films and transparent electrodes. The high conductivity and extreme anisotropy ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904589

75. Methods for TEM analysis of NIST‰s SWCNT SRM
Topic: Nanomaterials
Published: 3/25/2010
Authors: Roy Howard Geiss, Elisabeth Mansfield, Jeffrey A Fagan
Abstract: The National Institute of Standards and Technology (NIST) is developing a series of single-walled carbon nanotube, SWCNT, reference materials, RMs, to provide researchers with well characterized materials for their applications. The SWCNT reference m ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905078

76. 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

77. 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

78. 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

79. 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

80. 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



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