Abstract
To examine the existence of a Laplace pressure inside a micelle, the temperature dependence of the maximum additive concentration (MAC) of an alkane in a micellar solution of a nonionic surfactant obtained by K. Kuriyama ( Kolloid-Z., 180, 55, 1962) has been analyzed by means of the conventional and the corpuscular phase separation models. The conventional phase model, in which the Laplace pressure is not allowed, failed to explain the MAC versus temperature relation, whereas the corpuscular phase model, taking into account the Laplace pressure, could quantitatively explain the relation well. It can, therefore, be considered that the Laplace pressure may be present inside the micelles and the corpuscular phase model is a better and a convenient thermodynamic model for describing micellar behavior.
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