Adsorption-Induced Deformation of Mesoporous Solids

Details Adsorption-Induced Deformation of Mesoporous Solids Adsorption-Induced Deformation of Mesoporous Solids

2010-03-29

arxiv.org/abs/1003.5608v3

Physics

Chemical Physics

21 pages, 3 figures

Scientific paper

10.1021/la1019247

The Derjaguin - Broekhoff - de Boer theory of capillary condensation is employed to describe deformation of mesoporous solids in the course of adsorption-desorption hysteretic cycles. We suggest a thermodynamic model, which relates the mechanical stress induced by adsorbed phase to the adsorption isotherm. Analytical expressions are derived for the dependence of the solvation pressure on the vapor pressure. The proposed method provides a description of non-monotonic hysteretic deformation during capillary condensation without invoking any adjustable parameters. The method is showcased drawing on the examples of literature experimental data on adsorption deformation of porous glass and SBA-15 silica.

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