Adsorption hysteresis and capillary condensation in disordered porous solids: a density functional study

Details Adsorption hysteresis and capillary condensation in disordered porous solids: a density functional study Adsorption hysteresis and capillary condensation in disordered porous solids: a density functional study

2002-05-31

arxiv.org/abs/cond-mat/0205663v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

30 pages, 18 figures. To appear in J. Phys.: Condens. Matter

Scientific paper

10.1088/0953-8984/14/40/319

We present a theoretical study of capillary condensation of fluids adsorbed in mesoporous disordered media. Combining mean-field density functional theory with a coarse-grained description in terms of a lattice-gas model allows us to investigate both the out-of-equilibrium (hysteresis) and the equilibrium behavior. We show that the main features of capillary condensation in disordered solids result from the appearance of a complex free-energy landscape with a large number of metastable states. We detail the numerical procedures for finding these states, and the presence or absence of transitions in the thermodynamic limit is determined by careful finite-size studies.

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