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Search Publications by: Daniel A Fischer (Fed)

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Displaying 101 - 125 of 231

Changes in Electronic Structure of the Electrochemically Li-Ion Deintercalated LiNiO 2 System Investigated by Soft X-Ray Absorption Spectroscopy

December 7, 2006
Author(s)
W S. Yoon, Kyung Y. Chung, James McBreen, Daniel A. Fischer, Xiao-Qing Yang
The electronic structures of Li1-xNiO2 system after electrochemically delithiated to various x values have been investigated using soft X-ray absorption spectroscopy (XAS) for oxygen K-edge and Ni LII,III-edge. By comparing the O K-edge XAS spectra of Li1

Thickness Dependence of Microstructure in Semiconducting Films of an Oligofluorene Derivative

December 7, 2006
Author(s)
Dean M. DeLongchamp, Mang-Mang Ling, Youngsuk Jung, Daniel A. Fischer, Mark Roberts, Eric K. Lin, Zhenan Bao
The measurement and optimization of microstructure development in organic semiconductor films is valuable because microstructure in many cases critically impacts electronic performance. We demonstrate a general method to measure microstructure thickness

Anti-Biofouling Properties of Comb-Like Block Copolymer With Amphiphilic Side-Chains

August 11, 2006
Author(s)
Sitaraman Krishnan, R Ayothi, A Hexemer, J Finlay, K E. Sohn, R Perry, Christopher K. Ober, E J. Kramer, M E. Callow, J A. Callow, Daniel A. Fischer
Surfaces of novel block copolymers with amphiphilic side chains were studied for adhesion of marine organisms. the surface-active polymer, obtained by grafting fluorinated molecules with hydrophobic and hydrophilic blocks to a block copolymer precursor

Effect of Self-Assembled Monolayer Film Order on Nanofriction

July 6, 2006
Author(s)
S Sambasivan, S Hsieh, Daniel A. Fischer, Stephen M. Hsu
Friction at the nanoscale has become a significant challenge for microsystems, including MEMS, NEMS and other devices. At nanoscale, lateral loading often causes component breakage and loss of functions in devices, therefore, accurate measurement and

Correlating Molecular Design to Microstructure in Thermally Convertible Oligothiophenes: The Effect of Branched versus Linear End Groups

June 8, 2006
Author(s)
Dean M. DeLongchamp, Youngsuk Jung, Daniel A. Fischer, Eric K. Lin, P C. Chang, V Subramanian, A R. Murphy, J M. Frechet
The thin film microstructure development of functionalized oligothiophenes with branched, thermally removable groups at each end of conjugated cores with five, six, and seven thiophene rings was monitored during their thermal conversion from solution

Soft X-Ray Absorption Spectroscopy of the MgB 2 Boron K Edge in an MgB 2 /Mg Composite

June 8, 2006
Author(s)
Daniel A. Fischer, A R. Moodenbaugh, Q Li, G Gu, Y Zhu, J W. Davenport, D O. Welch, H Su
Soft x-ray absorption (XAS), using fluorescence yield, was used to study the boron K near edge in MgB2 superconductor. The sample consists of MgB2 crystallites randomly oriented in a magnesium matrix. Abrasion of the sample surface in vacuum provides a

Solution and Surface Composition Gradients via Microfluidic Confinement: Fabrication of a Statistical-Copolymer-Brush Composition Gradient

June 6, 2006
Author(s)
Chang Xu, Susan E. Barnes, Tao Wu, Daniel A. Fischer, Dean M. DeLongchamp, J Batteas, Kathryn L. Beers
A simple method to generate solution gradients through microfluidic confinement is described. The solution gradient inside a microchannel was formed by varying the relative infusion rates of two solutions that differed in compositions. The establishment

Characterization of the Skin Orientation of Thermotropic Liquid-Crystalline Copolyester Moldings with Near-Edge X-ray Absorption Fine Structure

May 11, 2006
Author(s)
Robert A. Bubeck, L S. Thomas, S Rendon, W R. Burghardt, A Hexemer, Daniel A. Fischer
The process of injection molding net-shape parts from thermotropic liquid crystalline polymers (TLCPs) results in a skin-core macrostructure. The underlying orientation in the core and the skin may differ both in magnitude and direction. A combination of

Effect of Self-Assembled Monolayer Film Order on Nanofriction

May 11, 2006
Author(s)
S Sambasivan, S Hsieh, Daniel A. Fischer, Stephen M. Hsu
Self-assembled monolayers (SAMs) have increasingly being explored as potential protective films in devices friction and adhesion. However, accurate determination of the nanomechanical properties of monolayer films is difficult and fraught with