Phase equilibria and interfacial properties of model ternary mixtures

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Abstract
We use a mean field theory for non-uniform molecular fluids to study the interfacial properties of the AB liquid-liquid interface of model ternary mixtures (A, B, C) with one amphiphilic component (C). We calculate the surface tension, adsorption and density-orientational profiles at the interface as a function of the bulk composition of C in the two liquid phase region. The latter terminates at a plait, tricritical or triple point depending on the values of the external fields (temperature and pressure) and on the parameters characterizing the intermolecular interactions. The surface tension of the AB interface decreases rapidly with the bulk concentration of C and vanishes at the plait and tricritical points. Under conditions of three phase equilibria the AB interface is characterized, in general, by low surface tensions and may undergo a wetting transition.

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