Spectroscopic studies of the structure and orientational effects of electroresponsive polymeric and Langmuir-Blodgett films.
Item
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Title
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Spectroscopic studies of the structure and orientational effects of electroresponsive polymeric and Langmuir-Blodgett films.
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Identifier
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AAI9108086
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identifier
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9108086
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Creator
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Chen, Jiming.
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Contributor
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Adviser: Marten L. denBoer
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Date
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1990
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Language
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English
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Publisher
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City University of New York.
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Subject
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Physics, Condensed Matter | Physics, Molecular
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Abstract
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The microscopic structure, bond length, orientation, and coordination number of a series of electroresponsive molecular and polymeric systems were studied by several spectroscopic techniques: Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy, Near-Edge X-ray Absorption Fine Structure (NEXAFS) spectroscopy, X-ray diffraction, and Fourier-Transform Infra-Red (FTIR) spectroscopy. The studies concern ion complexation in poly(ethylene oxide), and the structure and orientation of pyrrole and thiophene based Langmuir-Blodgett (LB) films and electrochemically polymerized poly(3-methylthiophene) films. The temperature dependence of the coordination number of oxygen around the cation K{dollar}\sp{lcub}+{rcub}{dollar} in the ion-conducting polymer complex of poly(ethylene oxide) and potassium iodide was studied with EXAFS and NEXAFS spectroscopies. NEXAFS spectroscopy also is a sensitive probe of the orientational behavior of LB films. The relative intensities of the absorption peaks from the core level ground state to {dollar}\sigma{dollar}* and {dollar}\pi{dollar}* antibonding states at different incident angles of the x-ray beam can be used to calculate the orientation of the molecules. In the near-edge C K-edge spectra of various LB films, a charge transfer interaction between a polymer film and its metallic substrate was also observed. The layer structure and in-plane structure of LB films were studied by x-ray diffraction. A clear superlattice structure was observed in Y-type LB films. The temperature dependance of the structure of LB film also was studied by x-ray diffraction. The orientation and ordering of thin films of the electron conducting polymer poly(3-methylthiophene) were also studied by NEXAFS, and FTIR spectroscopic techniques. The results of the NEXAFS and the FTIR experiments are consistent.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
