Capillary condensation and hysteresis in disordered porous materials

L Sarkisov, P A Monson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this article we consider capillary condensation and hysteresis in molecular models of fluids confined in a disordered porous materials. Capillary phase diagrams for these systems show that the phase behavior is substantially modified by confinement in the porous material. Isotherms from grand canonical Monte Carlo simulations of these systems exhibit hysteresis loops which resemble those seen in experiments on adsorption in silica xerogels. The hysteresis in the Monte Carlo simulations is associated with metastability of low density states on the adsorption branch and high density states on the desorption branch of the isotherm. It is suggested that further investigation of the stability of these states in Monte Carlo simulations and their relationship with those seen in experiments is worthwhile. In this regard an algorithm for simulation of adsorption via diffusive mass transfer based on the grand canonical molecular dynamics with control volume method is described. An illustrative application to the hysteresis in the bulk vapor-liquid equilibrium for the Lennard-Jones 12-6 fluid is presented.

Original languageEnglish
Title of host publicationCHARACTERIZATION OF POROUS SOLIDS V
EditorsKK Unger, G Kreysa, JP Baselt
Place of PublicationAMSTERDAM
PublisherElsevier B.V.
Pages21-29
Number of pages9
ISBN (Print)0-444-50259-9
Publication statusPublished - 2000
Event5th International Symposium on the Characterization of Porus Solids (COPS-V) - HEIDELBERG
Duration: 30 May 19992 Jun 1999

Conference

Conference5th International Symposium on the Characterization of Porus Solids (COPS-V)
CityHEIDELBERG
Period30/05/992/06/99

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