Abstract
Aqueous dispersions of thallium(I) oleate soaps were prepared by direct mixing of thallium(I) nitrate solutions with solutions of potassium oleate. It was found that above a certain excess concentration of soap, the turbidity decreased sharply, indicating stable dispersions of small particles. This transition between low and high turbidities in excess soap defined the boundary between stable and unstable soap suspensions and was labeled the critical transition concentration (ctc). At much larger excess of oleate ions, thallium(I) oleate formed soluble complexes. The ionic strength was found to have a pronounced influence on the boundary between the regions of soluble and insoluble soaps.
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