Electrochemical morphogenesis of zinc and silver metals.
Item
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Title
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Electrochemical morphogenesis of zinc and silver metals.
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Identifier
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AAI9108124
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identifier
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9108124
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Creator
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Kahanda, Galathara Lekamge Mahendra Kumara Samarakone.
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Contributor
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Adviser: Micha Tomkiewicz
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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 | Chemistry, Physical
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Abstract
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The morphological evolution of zinc and silver metals in a pseudo two dimensional, thin layer, three electrode electrochemical cell was studied. Detailed growth patterns were obtained with varying applied potential and the concentration of the active and supporting electrolytes. We found a correlation between the kinetics of the deposition and the fractal dimension of the deposit. The general trend of the growth structures is similar for all systems as the potential varies from the activation to the mass transfer limited region. Near the activation region, deposits resemble the mossy type structures while in the mass transfer limit it follows the DLA type growth, depending upon the active electrolyte concentration and diffusion-migration ratio. The frequency dispersions of the impedance of smooth and the ramified silver deposits, in their oxidized and unoxidized state, were measured. We sought to correlate the constant phase angle exponent (CPA) with surface fractal dimension of the deposits and compare the results with present theories. A monotonic relation between the two parameters was found. The functional relationship is insensitive to the dielectric properties of the interface.
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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.
