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Author: daniel fischer

Displaying records 181 to 190 of 209 records.
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181. Temperature Dependence of Molecular Orientation on the Surfaces of Semi-Fluorinated Polymer Thin Films
Published: 2/1/2000
Authors: Jan Genzer, E Sivaniah, E K Kramer, J G Wang, H Koerner, K Char, Christopher K. Ober, B M DeKoven, Robert A Bubeck, Daniel A Fischer, S Sambasivan
Abstract: Near-edge X-ray absorption fine structure is used to investigate the temperature dependence of molecular orientation of semi-fluorinated liquid crystalline (SF-LC) mesogens, which are attached to the modified isoprene backbone of i) a polyisoprene ho ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850305

182. Orientation of Surface Bound Proteins Studied by Near Edge X-Ray Absorption Fine Structure
Published: 1/25/2000
Authors: L Gamble, J R Long, P S Stayton, Daniel A Fischer, S Sambasivan, David G. Castner
Abstract: The orientation of surface bound proteins may play an important role in the function and properties of materials to which they are adsorbed. Near edge absorption fine structure (NEXAFS) is a technique which allows the user to determine the presence ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850375

183. In Situ Characterization of Catalytic Propylene Oxidation on the Pt (111) Surface
Published: 1/17/2000
Authors: A M Gabelnick, A T Capitano, D J Burnett, Daniel A Fischer, J L Gland
Abstract: The catalytic oxidation of propylene with both propylene and oxygen in the gas phase has been characterized on the Pt(111) surface. In situ soft x-ray kinetic and spectroscopic measurements using fluorescence detection have been used to characterize ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850474

184. Effects of Annealing on UHMWPE Molecular Orientation
Published: 1/1/2000
Authors: S Sambasvian, Daniel A Fischer, M C Shen, John A Tesk, Stephen M. Hsu
Abstract: Ultra-high molecular weight polyethylene (UHMWPE) is the dominant material used in artificial joints due to its outstanding wear resistance. At the same time, UHMWPE wear debris has been found to contribute to the loosening of the im-plants. As li ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851641

185. Propylene Oxidation Mechanisms and Intermediates Using In-Situ Soft X-Ray Fluorescence Methods on the Pt(111) Surface
Published: 1/1/2000
Authors: A M Gabelnick, A T Capitano, S M Kane, J L Gland, Daniel A Fischer
Abstract: The oxidation of propylene on the Pt(111) surface has been characterized in oxygen pressures up to 0.02 torr using fluorescence yield near -edge spectroscopy (FYNES) and temperature programmed fluorescence yield near-edge spectroscopy (TP-FYNES) abov ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850320

186. Reaction of NO^d2^ with Zn and ZnO: Photoemission, XANES and Density Functional Studies of the Formation of NO^d3^
Published: 1/1/2000
Authors: J A Rodriguez, T Jirsak, J Dvorak, S Sambasivan, Daniel A Fischer
Abstract: Synchrotron-based high-resolution photoemission and x-ray absorption near-edge spectroscopy (XANES) have been used to study the interaction of NO^d2^ with polycrystalline surfaces of metallic zinc and zinc oxide. NO^d2^ exhibits a complex chemistry ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850380

187. The Use of Cyclic Phosphazene Additives to Enhance the Performance of the Head/Disk Interface
Published: 1/29/1999
Authors: H J Kang, Q Zhao, F E Talke, D J Perettie, B M DeKoven, T A Morgan, Daniel A Fischer, Stephen M. Hsu, C S Bhatia
Abstract: Phase separation of phosphazene additives in perfluoropolyalkylether (PFPAE) lubricants is investigated as a function of additive concentration and lubricant layer thickness. The tribological behavior of various phosphazene additive/lubricant mixture ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850210

188. Wear Induced Molecular Orientation in Ultra High Molecular Weight Polyethylene (UHMWPE) Measured by Soft X-Ray Adsorption
Published: 1/29/1999
Authors: Daniel A Fischer, S Sambasivan, M C Shen, Stephen M. Hsu
Abstract: Molecular orientation in ultra high molecular weight polyethylene (UHMWPE) when it is subjected to wear is important in understanding the basic wear processes for this material. Current methods of inferring or deducing orientation information for UH ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850262

189. Effects of Wear Motion on Ultra High Molecular Weight Polyethylene (HMWPE) Molecular Orientation
Published: 1/28/1999
Authors: S Sambasivan, Daniel A Fischer, M C Shen, Stephen M. Hsu
Abstract: In a human hip joint, the motion is complex and consists of flexion/extension, abduction, and adduction. Laboratory studies have shown that these motions increase wear significantly. The aim of this study is to measure the change in molecular orien ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850261

190. Morphology of Polyethylene-Carbon Black Composites
Published: 11/1/1998
Authors: G Beaucage, Daniel A Fischer, Gabrielle Gibbs Long, S Rane, D W Schaefer
Abstract: Carbon black is a common polymer additive that is used for reforcement and for its ability to enhance physical properties such as conductivity. This paper pertains to a small-angle x-ray scattering [SAXS] study of a conductive grade of carbon black ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850323



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