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You searched on: Author: daniel fischer

Displaying records 171 to 180 of 211 records.
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171. Molecular Mechanisms of Propyne Oxidation on the Pt(111) Surface: In Situ Soft X-Ray Studies in Pressures of Oxygen
Published: 8/1/2001
Authors: A M Gabelnick, D J Burnett, J L Gland, Daniel A Fischer
Abstract: Oxidation of preadsorbed propyne has been characterized on the Pt(111) surface in oxygen pressures up to 1.2 Pa. using fluorescence yield ultra-soft X-ray adsorption methods above the carbon K edge. A combination of temperature programmed reaction s ...

172. Polymer Chain Relaxation: Surface Outpaces Bulk
Published: 7/1/2001
Authors: William E Wallace III, Daniel A Fischer, K Efimenko, Wen-Li Wu, Jan Genzer
Abstract: In this work we show how carbon near-edge X-ray absorption fine structure (NEXAFS) can be applied to detect both surface and bulk segmental relaxation in uniaxially deformed polystyrene samples. We demonstrate that by simultaneously monitoring the p ...

173. Abstracts for the MSEL Assessment Panel, March 2001
Published: 1/26/2001
Authors: Leslie E Smith, Alamgir Karim, Leonid A Bendersky, C Lu, J J Scott, Ichiro Takeuchi, Kathleen M. Flynn, Vinod K Tewary, Davor Balzar, G A Alers, Stephen E Russek, Charles C. Dr. Han, Haonan Wang, William E Wallace III, Daniel A Fischer, K Efimenko, Wen-Li Wu, Jan Genzer, Joseph C Woicik, Thomas H. Gnaeupel-Herold, Henry Joseph Prask, Charles F. Majkrzak, Norman F. Berk, John Barker, Charles Joseph Glinka, Eric K Lin, Ward L Johnson, Paul R Heyliger, David Thomas Read, R R Keller, J Blendell, Grady S White, Lin-Sien H Lum, Eric J Cockayne, Igor Levin, C E Johnson, Maureen E Williams, Gery R Stafford, William J Boettinger, Kil Won Moon, Daniel Josell, Daniel Wheeler, Thomas P Moffat, W H Huber, Lee J Richter, Clayton S. Yang, Robert D Shull, R A. Fry, Robert D McMichael, William F. Egelhoff Jr., Ursula R Kattner, James A Warren, Jonathan E Guyer, Steven P Mates, Stephen D Ridder, Frank S. Biancaniello, D Basak, Jon C Geist, Kalman D Migler
Abstract: Abstracts relating to research and development in the NIST Materials Science and Engineering Laboratory (MSEL) are presented for a poster session to be presented to the 2001 MSEL Assessment Panel.

174. Near Edge X-Ray Absorption Fine Structure Characterization of Polymers Based on 2-Vinyl-4,5-Dieyanoimidazole
Published: 1/1/2001
Authors: A L Marsh, D J Burnett, Daniel A Fischer, P G Rasmussen, J L Gland
Abstract: Polymer thin films are used for a variety of applications ranging from microelectronics to coatings. New polymers, designed with specific applications in mind are currently being developed. Polyvinazene, a poly(imidazole) based on the monomer 2-vin ...

175. Direct Observations of Propylene and Silver Transformations on the Surface and in the Pores of Silver Y Zeolites
Published: 12/1/2000
Authors: S Sambasivan, Daniel A Fischer, B M DeKoven, A Kuperman
Abstract: Near-Edge Soft X-ray Absorption Spectroscopy Fine Structure (NEXAFS) electron yield (surface sensitive about 50 ) and fluorescence yield (bulk sensitive) have been applied simultaneously to characterize the adsorbed state of propylene in the surface ...

176. Combined ^u63,65^Cu NQR and NMR Study of Y^d1-x^Ca^dx^Ba^d2^Cu^d3^O^dy^
Published: 11/1/2000
Authors: D M Potrepka, J. I. Budnick, A R Moodenbaugh, Daniel A Fischer, W A Hines
Abstract: Zero-field ^u63,65^Cu nuclear quadrupole resonance (NQR) and nuclear magnetic resonance (NMR) spectra were obtained at 1.3 K for powdered samples of Y^d1-x^Ca^dx^Ba^d2^Cu^d3^O^dy^ with 0 {less than or equal to} x {less than or equal to} 0.20. The re ...

177. The Effect of Changing Molecular End Groups on Surface Properties: Synthesis and Characterization of Poly (Styrene-b-Semifluorinated Isoprene) Block Copolymers With -CF^d2^H End Groups
Published: 10/1/2000
Authors: T Hayakawa, J G Wang, M Xiang, X Li, M Ueda, Christopher K. Ober, Jan Genzer, E Sivaniah, E J Kramer, Daniel A Fischer
Abstract: Poly(styrene-b-semifluorinated isoprene) block copolymers with -CF^d2^H terminated side groups were synthesized by the esterification reaction of a poly(styrene-b-hydroxylated 1,2-/3,4-isoprene) block copolymer with semifluorinated acid chlorides. T ...

178. Molecular Orientation of Single and Two-Armed Monodendron Semifluorinated Chains on Soft and Hard Surfaces Studied Using NEXAFS
Published: 8/1/2000
Authors: Jan Genzer, E Sivaniah, E K Kramer, J G Wang, M Xiang, K Char, Christopher K. Ober, Robert A Bubeck, Daniel A Fischer, M Graupe, R Colorado, O E Shmakova, T R Lee
Abstract: Near-edge absorption fine structure (NEXAFS) measurements are used to probe the molecular orientation of semifluorinated (SF) mesogens, -(CH^d2^)x(CF^d2^)yF, which are attached to I) the isoprene backbone of polyisoprene or a styrene-isoprene dibloc ...

179. Surface Stability in Liquid-Crystalline Block Copolymers With Semifluorinated Monodendron Side Groups
Published: 8/1/2000
Authors: M Xiang, X Li, Christopher K. Ober, K Char, Jan Genzer, E Sivaniah, E K Kramer, Daniel A Fischer
Abstract: Block copolymers with semifluorinated monodendron side groups were synthesized by attachement of a first generation 2-or 3-armed monodendron acid chloride to a hydroxylated poly(styrene-b-1,2/3,4-isoprene). A convergent growth strategy was developed ...

180. Chemistry of NO^d2^ on CeO^d2^ and MgO: Experimental and Theorectical Studies on the Formation of NO^d3^
Published: 6/1/2000
Authors: J A Rodriguez, T Jirsak, S Sambasivan, Daniel A Fischer, A Maiti
Abstract: In environmental catalysis the destruction or removal of nitrogen oxides (DeNOx process) is receiving a lot of attention. Synchrotron-based x-ray absorption near-edge spectroscopy, high-resolution photoemission, and first-principles density-function ...

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