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Author: daniel fischer

Displaying records 171 to 180 of 208 records.
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171. 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 ...

172. 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 ...

173. 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 ...

174. 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 ...

175. 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 ...

176. 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 ...

177. 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 ...

178. Multilevel Structure of Reinforcing Silica and Carbon
Published: 6/1/2000
Authors: D W Schaefer, T Rieker, M M Agamalian, J S Lin, Daniel A Fischer, S Sukumaran, C I Chen, G Beaucage, C Herd, J Ivie
Abstract: We study the structure of colloidal silica and carbon on length scales from 0.25 ...

179. The Orientation of Semifluorinated Alkanes Attached to Polymers at the Surface of Polymer Films
Published: 3/1/2000
Authors: Jan Genzer, E Sivaniah, E K Kramer, J G Wang, H Kerner, M Xiang, K Char, Christopher K. Ober, B M DeKoven, Robert A Bubeck, M K Chaudhury, S Sambasivan, Daniel A Fischer
Abstract: The surface molecular orientation of a liquid crystalline (LC) layer made up a semi-fluorinated (SF) single side-groups [-CO-(CH^d2^)^dx-1^-(CF^d2^)^dy^F] (single SF groups) attached to polyisoprene homopolymer or the isoprene block of a styrene-isop ...

180. Hole State Density of La^d1-x^Sr^dx^CoO^d3-{Delta} (0{less then or equal to}x{less then or equal to}0.5) Across the Insulator/Metal Phase Boundary
Published: 2/1/2000
Authors: A R Moodenbaugh, B Nielson, S Sambasivan, Daniel A Fischer, T Friessnegg, S Aggarwal, R Ramesh, B Pfeffer
Abstract: The oxygen K near edge x-ray absorption fine structure (NEXAFS) of polycrystalline and film La1-xSrxCoO3-d at room temperature was studied using fluorescence yield techniques. The bulk sensitive nature of fluorescence yield (relative to electron yie ...

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