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Author: angela hight walker

Displaying records 21 to 30 of 74 records.
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21. Origin of the exceptional negative thermal expansion in metal-organic framework-5 Zn^d4^O(1,4-benzenedicarboxylate)^d3
Published: 8/1/2008
Authors: Wei Zhou, Hui Wu, Taner Yildirim, Jeffrey Ray Simpson, Angela R Hight Walker
Abstract: Metal-organic framework-5 (MOF-5) was recently suggested to possess an exceptionally large negative thermal expansion coefficient. Our direct experimental measurement of the thermal expansion of MOF-5, using neutron powder diffraction, in the tempe ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=610032

22. Influence of the Colloidal Environment on the Magnetic Behavior of Cobalt Nanoparticles
Published: 11/6/2007
Authors: Guangjun Cheng, Cindi L Dennis, Robert D Shull, Angela R Hight Walker
Abstract: The magnetic properties of 10 nm cobalt (Co) nanoparticles in 1,2-dicholorbenenze (DCB) are investigated via a series of magnetization (M) vs. temperature (T) measurements. A rapid rise in magnetization around 250 K during warming and a sudden drop a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841084

23. The Influence of Temperature on the Magnetic Behavior of Collodial Cobalt Nanoparticles
Published: 6/7/2007
Authors: Cindi L Dennis, Brian B. Maranville, Angela R Hight Walker, Robert D Shull
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901755

24. Synthesis and Characterization of Cobalt/Gold Bimetallic Nanoparticles
Published: 4/1/2007
Authors: Guangjun Cheng, Angela R Hight Walker
Abstract: Cobalt/gold (Co/Au) bimetallic nanoparticles are prepared by synthesizing Au via chemical reduction in the presence of pre-synthesized Co nanoparticles. Transmission electron microscopy (TEM), ultraviolet-visible (UV-vis) absorption spectrometry, and ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841034

25. Dielectric response of aligned semiconducting single-wall nanotubes
Published: 1/1/2007
Authors: J A Fagan, Jeffrey Ray Simpson, B J Landi, L J Richter, I Mandelbaum, V Bajpai, D L Ho, R Raffaelle, Angela R Hight Walker, B J Bauer, Erik K Hobbie
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=101743

26. The influence of temperature on the magnetic behavior of colloidal cobalt nanoparticles
Published: 1/1/2007
Authors: C L Dennis, Guangjun Cheng, K A Baler, B B Maranville, Angela R Hight Walker, R D Shull
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=101730

27. Comparative Measures of Single Wall Carbon Nanotube Dispersion
Published: 9/14/2006
Authors: Jeffrey A Fagan, Brian Landi, Idan Mandelbaum, Vardhan Bajpai, Barry J. Bauer, Kalman D Migler, Jeffrey Ray Simpson, Angela R Hight Walker, Ryan Raffaelle, Erik K. Hobbie
Abstract: Model polymer composites of DNA wrapped single-wall carbon nanotubes (SWNTs) dispersed in polyacrylic acid are used for a systematic comparison of the different metrologies currently used to evaluate SWNT dispersion. Application of a pH-controlled v ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852660

28. Method for Measuring the Raman Gain Tensor in Optical Fiber
Published: 4/7/2006
Authors: Idan Mandelbaum, M Bolshtyansky, T F Heinz, Angela R Hight Walker
Abstract: In this paper we introduce a technique to measure the tensor properties of the Raman gain in a short piece (10m) of silica based polarization maintaining optical fiber. We present the results of the measurement and show agreement with new and previo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840959

29. High Resolution THz Spectroscopy of Crystalline Trialanine: Extreme Sensitivity to {beta}-sheet Structure and Co-crystallized Water
Published: 4/6/2006
Authors: Karen M. Siegrist, C R. Bucher, Idan Mandelbaum, Angela R Hight Walker, R Balu, Susan K. Gregurick, David F Plusquellic
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=104190

30. Quantitative, Interactive Measurement of Tissue Engineering Scaffold Structure Using Immersive Visualization
Published: 1/1/2006
Authors: Jeffrey A Fagan, Erik K. Hobbie, Brian Landi, Idan Mandelbaum, Vardhan Bajpai, Barry J. Bauer, Kalman D Migler, Jeffrey Ray Simpson, Angela R Hight Walker, Ryan Raffaelle
Abstract: At NIST, we are using new approaches to better understand and quantify the structure of tissue engineering scaffolds. This approach uses immersive visualization (IV) and is inherently three dimensional, multivariate and interactive, providing real-ti ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852639



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