Ostwald ripening in emulsions: 2. Ostwald ripening in hydrocarbon emulsions: Experimental verification of equation for absolute rates

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Abstract

Kinetics of Ostwald ripening in emulsions of aliphatic C9C16 hydrocarbons stabilized by sodium dodecyl sulfate (SDS) was studied by means of photon correlation spectroscopy. Two kinds of systems were studied. In the first case, the emulsion medium was a diluted molecular solution of SDS; in the second one, the medium was a concentrated micellar solution of SDS. The experimental values of absolute Ostwald ripening rates were compared with the theoretical values. It was found that the experimental values are systematically higher by a factor of ∼2.5 than the theoretical ones. It was shown that the micellar solubility of hydrocarbons did not contribute essentially to the kinetics of Ostwald ripening in the investigated systems. A method for evaluation of the solubility of organic liquids in water, with a very low detection limit of about ∼10−11 ml/ml, was proposed.

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