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You searched on: Author: angela hight walker

Displaying records 21 to 30 of 79 records.
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21. Dipolar Chains formed by synthesized cobalt nanocubes
Published: 5/11/2009
Authors: Guangjun Cheng, Robert D Shull, Angela R Hight Walker
Abstract: Cobalt nanocubes with an average edge length of 50 nm and the epsilon crystalline structure were synthesized via thermo-decomposition in 1,2-dichlorobenzene at 120 oC in the presence of the surfactants. These nanocubes form dipolar chains upon drying ...

22. Towards optimization and characterization of dye-embedded gold nanoclusters for multiplexed optical imaging
Published: 2/26/2009
Authors: Michael A. McDonald, Angela R Hight Walker
Abstract: Metallic nanoparticle aggregates coupling strong surface plasmons with a Raman reporter molecule have been developed for application in multiplexed optical imaging. Of interest to our work is the ability of the agents to serve as surface-enhanced Ram ...

23. Transmission electron microscopy characterization of colloidal copper nanoparticles and their chemical reactivity
Published: 2/16/2009
Authors: Guangjun Cheng, Angela R Hight Walker
Abstract: A colloidal synthesis route was developed to produce face-centered cubic (fcc) copper (Cu) nanoparticles in the presence of the surfactants in an organic solvent under an argon environment. Various synthetic conditions have been explored to control t ...

24. Centrifugal Length Separation of Carbon Nanotubes
Published: 10/1/2008
Authors: Jeffrey A Fagan, Matthew Becker, Jae H. Chun, Barry J. Bauer, Jeffrey Ray Simpson, Angela R Hight Walker, Erik K. Hobbie
Abstract: Separation of single wall carbon nanotubes (SWCNTs) by length via centrifugation in a high density medium, and the characterization of both the separated fractions and the centrifugation process are presented. Significant quantities of the separated ...

25. Surface-Enhanced Raman Spectroscopy via Gold Nanostars
Published: 9/28/2008
Authors: Emren Nalbant-Esenturk, Angela R Hight Walker
Abstract: Anisotropic metallic nanoparticles have unique optical properties, which lend them to applications such as Surface Enhanced Raman Spectroscopy (SERS). Branched and star-shaped gold nanoparticles have been prepared in aqueous phase by seed-mediated gr ...

26. 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 ...

27. 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 ...

28. 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

29. 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 ...

30. 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

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