title: Thermodynamics of water intrusion in nanoporous hydrophobic solids.
abstract: We report a joint experimental and molecular simulation study of water intrusion in silicalite-1 and ferrerite zeolites. The main conclusion of this study is that water condensation takes place through a genuine first-order phase transition, provided that the interconnected pores structure is 3-dimensional. In the extreme confinement situation (ferrierite zeolite), condensation takes place through a continuous transition, which is explained by a shift of both the first-order transition line and the critical point with increasing confinement. The present findings are at odds with the common belief that conventional phase transitions cannot take place in microporous solids such as zeolites. The most important features of the intrusion/extrusion process can be understood in terms of equilibrium thermodynamics considerations. We believe that these findings are very general for hydrophobic solids, i.e. for both nonwetting as well as wetting water-solid interface systems.
authors.affiliation: Ecole nationale supérieure de chimie de Paris (Chimie ParisTech) and Université Pierre et Marie Curie-Paris 6, France.
authors.forename: Fabien
authors.initials: F
authors.lastname: Cailliez
authors.forename: Mickael
authors.initials: M
authors.lastname: Trzpit
authors.forename: Michel
authors.initials: M
authors.lastname: Soulard
authors.forename: Isabelle
authors.initials: I
authors.lastname: Demachy
authors.forename: Anne
authors.initials: A
authors.lastname: Boutin
authors.forename: Joël
authors.initials: J
authors.lastname: Patarin
authors.forename: Alain H
authors.initials: AH
authors.lastname: Fuchs