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Topic Area: Characterization, Nanometrology, and Nanoscale Measurements
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Displaying records 11 to 20 of 145 records.
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11. 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 Claude Maurice 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

12. 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 Claude Maurice 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

13. Quantifying Dithiothreitol Displacement of Functional Ligands from Gold Nanoparticles
Topic: Characterization, Nanometrology, and Nanoscale Measurements
Published: 10/27/2012
Authors: De-Hao 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

14. 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

15. 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

16. 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

17. 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

18. Disentangling the effects of polymer coatings on silver nanoparticle agglomeration, dissolution, and toxicity to determine mechanisms of nanotoxicity
Topic: Characterization, Nanometrology, and Nanoscale Measurements
Published: 9/1/2012
Authors: Justin M Zook, Melissa Danielle Halter, Danielle Cleveland, Stephen E Long
Abstract: Silver nanoparticles (AgNPs) are frequently coated by a variety of polymers, which may affect various intertwined mechanisms of toxicity, including agglomeration and dissolution rate. Here, we measure how citrate, dextran, poly(ethylene glycol) (PEG ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908497

19. Electro-Mechanical Properties of Graphene Drumheads
Topic: Characterization, Nanometrology, and Nanoscale Measurements
Published: 6/22/2012
Authors: Nikolai Nikolayevich Klimov, Suyong S. Jung, Shuze Zhu, Teng Li, C. Alan Wright, Santiago Solares, David B Newell, Nikolai B Zhitenev, Joseph A Stroscio
Abstract: The electro-mechanical properties of a suspended graphene layer are determined by scanning tunneling microscopy (STM) and spectroscopy (STS) measurements and computational simulations of the graphene membrane mechanics and morphology. The graphene ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910689

20. Photo-induced Surface Transformation of Silica Nanocomposites
Topic: Characterization, Nanometrology, and Nanoscale Measurements
Published: 6/22/2012
Authors: Justin M Gorham, Tinh Nguyen, Coralie Bernard, Deborah L Stanley, Richard D Holbrook
Abstract: The physicochemical, UV-induced surface modifications to silica nanoparticle (SiNP) - epoxy composites have been investigated. The silica nanocomposites (SiNCs) were prepared using a two-part epoxy system with 10 % mass fraction of SiNPs and expose ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910637