Adsorption-Induced Deformation of Mesoporous Solids
Gennady Yu. Gor, Alexander V. Neimark
TL;DR
This paper presents a thermodynamic model linking adsorption-induced stress to deformation in mesoporous solids during capillary condensation, accurately describing hysteretic deformation without adjustable parameters.
Contribution
It introduces a novel thermodynamic approach that relates mechanical stress to adsorption isotherms, providing analytical expressions for deformation during hysteresis.
Findings
Model accurately predicts non-monotonic hysteretic deformation
Describes deformation in porous glass and SBA-15 silica
No adjustable parameters needed for the model
Abstract
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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