Abstract
A dielectric thin film of charged surfaces intervening between two electrolyte solutions is considered as a model of the non-electrolyte films in water-in-oil emulsions, lipid bilayers or biomembranes. The fluctuations of the ion-charge density in the two electrolyte phases interact through the oil film thus giving rise to an effective attraction between the film surfaces, which is due to the ion correlations. The respective ionic correlation free energy of the film is calculated and its dependence on various factors is investigated. It is found that when the dielectric permittivity of the film substance is relatively high, the effect of ion correlations is comparable with the effect of van der Waals forces and can influence the thin film contact angle and emulsion stability.
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