Abstract
Aqueous sols of calcium olcate were prepared by mixing solutions of calcium nitrate with solutions of potassium oleate. It was found that above a certain excess concentration of oleate ions for a given concentration of calcium nitrate the turbidity drops sharply. The higher the concentration of Ca(NO 3) 2, the more K-oleate is required to produce sols of low turbidity. The entire “log [Ca(NO 3) 2]-log [K-oleate]” domain giving the transition boundary between the sols of high and low turbidity has been established. The transition boundary is linear over two orders of magnitude in concentration of precipitating components. Surface tensions of aqueous sols of calcium oleate were determined using the drop volume method, and considerable aging of the sols was observed. After 3–4 hours the surface tensions of the sols reach a steady value. The latter values were independent of the concentration of calcium nitrate in sols of low turbidity but sharply increased with increasing concentration of Ca(NO 3) 2 in sols of high turbidity. Electrophoresis showed calcium oleate particles to be strongly negatively charged even in moderate excess of calcium ions.
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