Weighted density-functional theory for simple fluids; prewetting of a Lennard-Jones fluid

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The prewetting of a Lennard-Jones fluid is studied using weighted density-functional theory. The intrinsic Helmholtz free-energy functional is separated into repulsive and attractive contributions. An accurate functional for hard spheres is used for the repulsive functional and a weighted density-functional method is used for the attractive part. The results for this theory are compared against mean-field density-functional theory, the theory of Velasco and Tarazona [E. Velasco and P. Tarazona, J. Chem. Phys. 91, 7916 (1989)] and grand canonical ensemble simulation results. The results demonstrate that the weighted density functional for attractive forces may offer a significant increase in accuracy over the other theories. The density-functional and simulation results also indicate that a previous estimate of the wetting temperature for a model of the interaction of argon with solid carbon dioxide, obtained from simulations [J. E. Finn and P. A. Monson, Phys. Rev. A, 39, 6402 (1989)], is incorrect. The weighted density-functional method indicates that triple-point prewetting is observed for this model potential.
Original languageEnglish
Article number11102
Number of pages1
JournalPhysical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
Issue number1
Publication statusPublished - Jan 2001


  • prewetting
  • Physics
  • Engineering (General). Civil engineering (General)
  • density
  • chemical engineering
  • fluids


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