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Modeling of Changing Electrode Profiles

Description: A model for simulating the transient behavior of solid electrodes undergoing deposition or dissolution has been developed. The model accounts for ohmic drop, charge transfer overpotential, and mass transport limitations. The finite difference method, coupled with successive overrelaxation, was used as the basis of the solution technique. An algorithm was devised to overcome the computational instabilities associated with the calculations of the secondary and tertiary current distributions. Simu… more
Date: December 1, 1980
Creator: Prentice, Geoffrey Allen
Partner: UNT Libraries Government Documents Department
open access

Bubble Dynamics at Gas-Evolving Electrodes

Description: Nucleation of bubbles, their growth by diffusion of dissolved gas to the bubble surface and by coalescence, and their detachment from the electrode are all very fast phenomena; furthermore, electrolytically generated bubbles range in size from ten to a few hundred microns; therefore, magnification and high speed cinematography are required to observe bubbles and the phenomena of their growth on the electrode surface. Viewing the action from the front side (the surface on which the bubbles form)… more
Date: December 1, 1980
Creator: Sides, Paul J.
Partner: UNT Libraries Government Documents Department
open access

Effect of nuclear spin on chemical reactions and internal molecular rotation

Description: Part I of this dissertation is a study of the magnetic isotope effect, and results are presented for the separation of /sup 13/C and /sup 12/C isotopes. Two models are included in the theoretical treatment of the effect. In the first model the spin states evolve quantum mechanically, and geminate recombination is calculated by numerically integrating the collision probability times the probability the radical pair is in a singlet state. In the second model the intersystem crossing is treated vi… more
Date: December 1, 1980
Creator: Sterna, L.L.
Partner: UNT Libraries Government Documents Department
open access

Activity and Diffusion of Metals in Binary Aluminum Alloys

Description: To determine the activity of zinc in Zn-Al alloys, the electromotive force (emf) of the cell: Zn/ZnCl/sub 2/-KC1 (eut)/Zn,Al was measured at temperatures between 569.5 K (296.5C) and 649.5 K (376.5C). The applicability of a two-suffix Margules equation was demonstrated, in good agreement with theoretical expectations. The diffusion coefficient of Zn in Al determined from a planar diffusion model for the experimental data was about 3 x 10/sup -10/ cm/sup 2//sec to 2 x 10/sup -9/ cm/sup 2//sec in… more
Date: December 1, 1980
Creator: Jao, Chiang Seng
Partner: UNT Libraries Government Documents Department
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