Percolation, depinning, and avalanches in capillary condensation of gases in disordered porous solids
Laboratoire de Physique Théorique des Liquides,
Université Pierre et
Marie Curie 4 place Jussieu, 75252 Paris Cedex 05, France
Accepted: 7 March 2003
We propose a comprehensive theoretical description of hysteresis in capillary condensation of gases in mesoporous disordered materials. Applying mean-field density-functional theory to a coarse-grained lattice-gas model, we show that the morphology of the hysteresis loops is influenced by out-of-equilibrium transitions that are different on filling and on draining. In particular, desorption may be associated to a depinning process and be percolation-like even without explicitly introducing pore-blocking effects.
PACS: 68.35.Rh – Phase transitions and critical phenomena / 75.10.Hk – Classical spin models / 75.60.Ej – Magnetization curves, hysteresis, Barkhausen and related effects
© EDP Sciences, 2003