Abstract
The spin-1 Ising model, which is equivalent to the three-component lattice gas model, is used to study wetting transitions in three-component surfactant systems consisting of an oil, water, and a nonionic surfactant. Phase equilibria, interfacial profiles, and interfacial tensions for three-phase equilibrium are determined in mean field approximation, for a wide range of temperature and interaction parameters. Surfactant interaction parameters are found to strongly influence interfacial tensions, reducing them in some cases to ultralow values. Interfacial tensions are used to determine whether the middle phase, rich in surfactant, wets or does not wet the interface between the oil-rich and water-rich phases. By varying temperature and interaction parameters, a wetting transition is located and found to be of the first order. Comparison is made with recent experimental results on wetting transitions in ternary surfactant systems.
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This paper is dedicated to J. K. Percus in honor of his 65th birthday.
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Shukla, K.P., Payandeh, B. & Robert, M. Theory of interfacial phase transitions in surfactant systems. J Stat Phys 63, 1053–1075 (1991). https://doi.org/10.1007/BF01029999
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DOI: https://doi.org/10.1007/BF01029999