Abstract
A theory of microemulsions containing spherical drops has been used to develop ternary phase diagrams and to predict interfacial tensions between phases for oil-water-surfactant systems. Various conditions ranging from those where the surfactant is rather hydrophilic to those where it is rather hydrophobic have been investigated. A novel feature of the theory is a method for determining the chemical potential of the surfactant in a microemulsion phase. This scheme makes it possible to determine the conditions for microemulsion inversion from water-continuous to oil-continuous behavior and to calculate the compositions of the two microemulsions in equilibrium at the inversion point. Predicted phase behavior and interfacial tensions are in general agreement with experimental results except that inversion is abrupt instead of gradual near the so-called optimal conditions.
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