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Poroelastic Theory Applied to the Adsorption-Induced Deformation of Vitreous Silica

TitlePoroelastic Theory Applied to the Adsorption-Induced Deformation of Vitreous Silica
Publication TypeJournal Article
Year of Publication2014
AuthorsCoasne BA, Weigel C, Polian A, Kint M, Rouquette J, Haines J, Foret M, Vacher R, Ruffle B
JournalThe Journal of Physical Chemistry B
Volume118
Issue49
Pagination14519 - 14525
Date PublishedDec-11-2014
ISSN1520-6106
Abstract

When vitreous silica is submitted to high pressures under a helium atmosphere, the change in volume observed is much smaller than expected from its elastic properties. It results from helium penetration into the interstitial free volume of the glass network. We present here the results of concurrent spectroscopic experiments using either helium or neon and molecular simulations relating the amount of gas adsorbed to the strain of the network. We show that a generalized poromechanical approach, describing the elastic properties of microporous materials upon adsorption, can be applied successfully to silica glass in which the free volume exists only at the subnanometer scale. In that picture, the adsorption-induced deformation accounts for the small apparent compressibility of silica observed in experiments.

URLhttp://pubs.acs.org/doi/10.1021/jp5094383
DOI10.1021/jp5094383
Short TitleJ. Phys. Chem. B
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