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Topic Area: Characterization, Nanometrology, and Nanoscale Measurements

Displaying records 51 to 60 of 199 records.
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51. Real-Time Size Discrimination and Elemental Analysis of Gold Nanoparticles using ES-DMA coupled to ICP-MS
Topic: Characterization, Nanometrology, and Nanoscale Measurements
Published: 1/22/2013
Authors: Sherrie R. Elzey, De-Hao D. Tsai, Lee Lijian Yu, Michael R Winchester, Michael E Kelley, Vincent A Hackley
Abstract: We report the development of a hyphenated instrument with the capacity to quantitatively characterize aqueous suspended gold nanoparticles (AuNPs) based on a combination of gas-phase size separation, particle counting, and elemental analysis. A custo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912171

52. Differentiation and characterization of isotopically modified silver nanoparticles in aqueous media using asymmetric-flow field flow fractionation coupled to optical detection and mass spectrometry
Topic: Characterization, Nanometrology, and Nanoscale Measurements
Published: 12/10/2012
Authors: Julien C. Gigault, Vincent A Hackley
Abstract: The principal objective of this work was to develop and demonstrate a new methodology for silver nanoparticle (AgNP) detection and characterization based on asymmetric-flow field flow fractionation (A4F) coupled to multiple detectors and using stable ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912174

53. Gold nanorod separation and characterization by asymmetric-flow field flow fractionation with UV-Vis detection
Topic: Characterization, Nanometrology, and Nanoscale Measurements
Published: 11/14/2012
Authors: Julien C. Gigault, Tae Joon Cho, Robert I. MacCuspie, Vincent A Hackley
Abstract: The application of asymmetrical-flow field flow fractionation (A4F) for gold nanorod (GNR) fractionation and characterization was comprehensively investigated. We report on two novel aspects of this application. The first addresses the analytical cha ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911860

54. Nanoscale Reference Materials for Environmental, Health, and Safety Measurements: Needs, Gaps, and Opportunities
Topic: Characterization, Nanometrology, and Nanoscale Measurements
Published: 11/7/2012
Authors: Aleksandr B. Stefaniak, Vincent A Hackley, Gert Roebben, Kensei Ehara, Steve Hankin, Michael T Postek, Iseult Lynch, Wei-En Fu, Thomas P.J. Linsinger, Andreas Th?nemann
Abstract: There is a need to understand and manage potential risks posed to workers, the public, and the environment from exposure to engineered nanomaterials. In response, several organizations have developed lists of relevant nano-objects and of physico-che ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910519

55. Quantifying Dithiothreitol Displacement of Functional Ligands from Gold Nanoparticles
Topic: Characterization, Nanometrology, and Nanoscale Measurements
Published: 10/27/2012
Authors: De-Hao D. Tsai, Frank W DelRio, Sherrie R. Elzey, Suvajyoti S. Guha, Michael Russel Zachariah, Vincent A Hackley, Melanie P Shelton
Abstract: Dithiothreitol (DTT)-based displacement is widely utilized for separating ligands from their gold nanoparticle (AuNP) conjugates, a critical step for differentiating and quantifying surface-bound functional ligands and therefore the effective surface ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911354

56. Temperature-dependent mechanical-resonance frequencies and damping in ensembles of gallium nitride nanowires
Topic: Characterization, Nanometrology, and Nanoscale Measurements
Published: 10/22/2012
Authors: Kristine A Bertness, Norman A Sanford, J. R. Montague, H.S. Park, Victor M. Bright, C. T. Rogers
Abstract: We have measured singly clamped cantilever mechanical-resonances in ensembles of as-grown gallium nitridenanowires (GaN NWs), from 12 K to 320 K. Resonance frequencies are approximately linearly dependent on temperature near 300 K ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910038

57. Aggregation/agglomeration state of carbon nanotubes
Topic: Characterization, Nanometrology, and Nanoscale Measurements
Published: 10/12/2012
Authors: Vivek M Prabhu, Toshiya Okazaki, Takeshi Eitoku, Masayoshi Tange, Haruhisa Kato
Abstract: Evaluation of aggregation and agglomeration of carbon nanotube (CNT) solution has been one of the key issues for applications. Here we introduce a simple method based on depolarized dynamic light scattering (DDLS) performed at multiple scattering ang ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912177

58. MEMS Kinematics by Super-Resolution Fluorescence Microscopy
Topic: Characterization, Nanometrology, and Nanoscale Measurements
Published: 9/28/2012
Authors: Craig Dyer McGray, Samuel M Stavis, Joshua Giltinan, Eric Eastman, Samara L. Firebaugh, Jenelle Piepmeier, Jon C Geist, Michael Gaitan
Abstract: Super-resolution fluorescence microscopy is used for the first time to study the nanoscale kinematics of a MEMS device in motion across a surface. A device under test is labeled with fluorescent nanoparticles that form a microscale constellation of n ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910908

59. UV-induced photochemical transformations of citrate capped silver nanoparticle suspensions
Topic: Characterization, Nanometrology, and Nanoscale Measurements
Published: 9/14/2012
Authors: Justin M Gorham, Robert I. MacCuspie, Kate L Klein, D Howard Fairbrother, Richard D Holbrook
Abstract: Due to the increasing use of silver nanoparticles (AgNPs) in consumer products, it is essential to understand how variables, such as light exposure, may change the physical and chemical characteristics of AgNP suspensions. To this end, the effect o ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911250

60. Renormalization of the graphene dispersion velocity determined from scanning tunneling spectroscopy
Topic: Characterization, Nanometrology, and Nanoscale Measurements
Published: 9/11/2012
Authors: Joseph A Stroscio, Jungseok Chae, Nikolai B Zhitenev, Suyong Jung, Andrea F. Young, Cory Dean, Yuanda Gao, Kenji Watanabe, Takashi Taniguchi, James Hone, Kenneth L. Shepard, Philip Kim, Lei Wang
Abstract: In most metals, electrons behave as non-interacting quasiparticles with renormalized dynamical properties in the presence of electron interactions. Historically, many measurements are capable to probe the effect of interactions at the Fermi energy. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911329



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