Capillary condensation in disordered porous materials: hysteresis versus equilibrium behavior

Details Capillary condensation in disordered porous materials: hysteresis versus equilibrium behavior Capillary condensation in disordered porous materials: hysteresis versus equilibrium behavior

2001-01-08

arxiv.org/abs/cond-mat/0101093v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.87.055701

We study the interplay between hysteresis and equilibrium behavior in capillary condensation of fluids in mesoporous disordered materials via a mean-field density functional theory of a disordered lattice-gas model. The approach reproduces all major features observed experimentally. We show that the simple van der Waals picture of metastability fails due to the appearance of a complex free-energy landscape with a large number of metastable states. In particular, hysteresis can occur both with and without an underlying equilibrium transition, thermodynamic consistency is not satisfied along the hysteresis loop, and out-of-equilibrium phase transitions are possible.

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