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ULTRASONIC STUDIES OF DIFFUSION CONTROLLED IONIC ASSOCIATION-DISSOCIATION.
CASE-WESTERN RESERVE UNIV CLEVELAND OHIO ULTRASONICS RESEARCH LAB
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Ultrasonic absorption measurements have been made in solutions of copper sulfate, magnesium sulfate, and cobalt sulfate over the frequency range 45 to 550 MHz using pulse modulated waves and a send-receive technique. The excess relaxational absorption data were computer processed and the relaxation times calculated. These results indicate that the high frequency relaxation for di-divalent electrolytes occurs at substantially higher frequencies than reported by earlier workers and is concentration dependent. On the basis of the values for partial molal volume changes, energies of activation, concentration dependence, deuteration effects, and foreign electrolyte effects, the high frequency absorption peak has been attributed to the diffusion controlled second order process leading to the formation of an encounter complex. The report also discusses possible difficulties arising from the lack of data for the non-relaxing portion of the absorption with the ionic constituents present. Author
APPROVED FOR PUBLIC RELEASE