We present analytical results for the grand canonical density functional of inhomogeneous fluids by explicitly taking into account the van der Waals tails of interfacial density profiles which are characteristic for systems with long-range forces. Two cases are considered: wetting of a wall by a one-component fluid near its liquid-gas coexistence line and interfacial wetting in a binary liquid mixture along its triple line. We discuss the influence of these van der Waals tails of the order of wetting transition as well as their relevance for the onset of critical adsorption.
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Napiórkowski et al. (1989) studied this question.
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