New developments for inhomogeneous fluids

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Abstract
Convenient theoretical methods for calculating structure and thermodynamic properties of a fluid near an attractive hard wall are developed. Using the diagram expansion technique, the accessible volume is divided in three layers: In the first one, the adsorption is due to the direct action of the potential on the particles. Its result can be treated as a separate fluid, so we call that a fictitious system. The adsorption phenomenon is then propagated in the second layer via the correlations between the fictitious and the unperturbed fluids. The third one is described by the reference fluid, the potential has no effect.