Thesis (Ph. D.)--University of Chicago. / Caption title. Reprinted from the American Journal of Physiology, vol. 7, no. 1, April, 1902. Includes bibliographical references. Also available on the Internet.

Bibliography: pages 103-106. / Beta-alumina solid electrolytes studied were subjected to charge and discharge cycles in a secondary, high energy density Na/beta-alumina/NaAlCl₄/FeCl₂ cell (known as the Zebra cell) at 250⁰ C. These electrolytes were studied by means of optical microscopy, as well as SEM and EDS analyses to est ablish possible failure modes. After cycling little discolouration, or impurity pickup was found to have occurred in the electrolyte. The forms of degradation of the beta-alumina electrolyte identified appeared to be a result of inherent flaws in the beta-alumina electrolyte tube, problems due to protracted storage of the tubes, or an apparent interfacial film on the cathode/electrolyte interface. A lead wetting agent was used in the cells to enhance the wetting of the beta-alumina electrolyte by the liquid Na. A study of the coating after cycling of the cell showed that the coating was adherent irrespective of the number of cycles completed. The coating did not appear to influence cracking of the electrolyte during cycling. Cracking of the beta-alumina electrolyte was found to have initiated from the Na/electrolyte interface. No evidence of crack initiation nor internal damage was found on the cathode/electrolyte interface. The cracks through the beta-alumina electrolyte wall were found to have sealed by the formation of a plug consisting largely of Na and Cl. On the basis of EDS analyses of the fracture surface of the sealed crack possible sealing mechanisms are proposed.

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Thesis (Ph. D.)--Florida State University, 2002. / Advisor: Dr. Joseph B. Schlenoff, Florida State University, College of Arts and Sciences, Dept. of Chemistry. Title and description from dissertation home page (viewed Sept. 29, 2003). Includes bibliographical references.

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x, 131 leaves : photos., graphs, tables ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Physical and Inorganic Chemistry, 1979

Thesis (Ph.D.) -- University of Adelaide, Dept. of Physical and Inorganic Chemistry, 1979.

The equilibrium constant for the dissociation of the BeF₄˭ ion in aqueous solutions of the ammonium salt has been computed by using the intensities of the fluorine nuclear magnetic resonance signals to indicate the concentrations of the three species at equilibrium. The simple dissociation may be represented as; BeF₄˭⇢ BeF₃¯+ F¯ (i) KE = 8.0 ± 0.9 x 10¯²moles (Kg)¯¹at 33°C. The equilibrium was measured over the temperature range 0-50°C but no appreciable temperature coefficient was observed. Variation of the concentration of BeF₂ solution allows the identification of further resonances, which have been associated with the unionized BeF₂ and a possible existence of a BeBeF₄ species. Chemical shift changes in the ⁹Be nuclear resonance positions are minimal. Some suggestions are made regarding the kinetics of fluorine exchange in reaction (i). The large changes in ¹¹B-¹⁹F coupling constant and ¹⁹F chemical shift of BF₄¯ ion at different concentration in aqueous and mixed solvents (acetone/water, dioxane/ water and D.M.S.O./water) have been interpreted in terms of changes in the hydrogen bonding of water to the BF₄¯ ion. The unique behavior of chemical shift and coupling constant in D.M.S.O./water has been explained by preferential solvation of BF₄¯ ion by the protolysis product of D.M.S.O. in water. The concentration dependence of the fluorine chemical shift of diamagnetic salts of fluoroanions of the type F¯, BF₄¯ and SiF₆˭ have been studies and the molal chemical shift has been correlated with the size and the charge of the cation. A displacement of the fluorine chemical shift to low field was observed for F¯, BF₄¯, BeF₄˭, PF₆¯ and SiF₆˭ aqueous solutions with paramagnetic cations Cu⁺⁺, Ni⁺⁺, Co⁺⁺, Fe⁺⁺, Fe⁺⁺⁺, Cr⁺⁺⁺ and Mn⁺⁺. These shifts are explained on the basis of ion-pair formation between cation and fluoroanion. The molar shifts have been interpreted in terms of a contact interaction between unpared electron and ¹⁹F nucleus. The contribution due to Pseudo contact shift, which arises due to anisotropy in g-factor is probably small. The changes in ¹⁹F line width with the concentration of paramagnetic ion have been discussed in the light of exchange between freee and ion-paired fluoro-anion. Further evidence regarding the ion-pair formation in f luoro-borates has been obtained from ¹¹B chemical shift and line width measurements. ¹⁹F N.M.R. spectra of HF₂¯ ion of Na⁺, K⁺ and NH₄⁺ cations have been studied, and the equilibrium constant for the reaction HF₂ ⇢ HF + F¯ (ii) have been measured for the potassium salt. Preliminary investigations of different gallium fluoride complex in mixtures of AgF and Ga(ClO₄)₃ have been made / Science, Faculty of / Chemistry, Department of / Graduate

The non-ideal aqueous electrolyte simulator (NAELS) is composed of three major parts: a Newton-Raphson non-linear optimization program written by Weare, et al (1987); an activity coefficient subroutine for non-ideal electrolyte systems based on Pitzer's model; and an extensive, user expandable database. It is robust, stable, and requires neither thermodynamic data nor initial guesses as input. NAELS provides very good estimates of equilibrium speciation and solubility in concentrated electrolyte systems. NAELS was assembled as a technical utility package for use on IBM-compatable microcomputers. / Graduation date: 1992