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Capillary condensation in disordered porous materials: hysteresis versus equilibrium behavior

E. Kierlik·P. A. Monson·M. L. Rosinberg·L. Sarkisov·G. Tarjus
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Abstract

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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E. Kierlik, P. A. Monson, M. L. Rosinberg, L. Sarkisov, G. Tarjus. 2001-01-08. Capillary condensation in disordered porous materials: hysteresis versus equilibrium behavior. https://doi.org/10.1103/physrevlett.87.055701

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