Abstract
Some of the thermodynamic properties, including bulk andsurface properties, of square-well fluids with ranges of interaction1.1≤λ≤3 have been investigated. Properties of vapor–liquid interfaces are obtained using densityfunctional theory, in which the Helmholtz free energy functional of the surface region isbased on hard sphere repulsive interactions between molecules under the local densityapproximation, and the attractive interactions between molecules are represented by asquare-well potential at the mean field level of approximation. Moreover, the vapor–liquidphase equilibrium, thermodynamic regularities and critical behavior of square-well fluidsare studied and a new regularity in the behavior of the reduced bulk modulus versusthe attractive range parameter is reported. We have also optimized square-wellpotential parameters using the surface tension experimental data for several purefluids.
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