Influence of Capillary Condensation on the Near-Critical Solvation Force

Details Influence of Capillary Condensation on the Near-Critical Solvation Force Influence of Capillary Condensation on the Near-Critical Solvation Force

2000-10-16

arxiv.org/abs/cond-mat/0010214v1

Phys. Rev. Lett. 85, 3079 (2000)

Physics

Condensed Matter

Statistical Mechanics

4 Pages, RevTeX, and 3 figures included

Scientific paper

10.1103/PhysRevLett.85.3079

We argue that in a fluid, or magnet, confined by adsorbing walls which favour liquid, or (+) phase, the solvation (Casimir) force in the vicinity of the critical point is strongly influenced by capillary condensation which occurs below the bulk critical temperature T_c. At T slightly below and above T_c, a small bulk field h<0, which favours gas, or (-) phase, leads to residual condensation and a solvation force which is much more attractive (at the same large wall separation) than that found exactly at the critical point. Our predictions are supported by results obtained from density-matrix renormalization-group calculations in a two-dimensional Ising strip subject to identical surface fields.

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