Diffusion During the Supercritical Drying of Silica Gels

Abstract : Drying is the most critical elaboration step of large monolithic and crack-free silica aerogel plates. In the present work, we are studying the supercritical CO2 drying and more precisely the first step, here called the supercritical washing step. This phase consists of replacing the liquid phase contained in the nanopores with supercritical CO2. Within this study, this step is governed by molecular diffusion through the gels. These phenomena were investigated experimentally in order to estimate the duration of the washing step. The experimental results were then fitted with an analytical mass transfer model to identify the effective diffusion coefficient.
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Article dans une revue
Drying Technology: An International Journal, 2006, 24 (9), pp.1121-1125. 〈10.1080/07373930600778270〉
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https://hal.archives-ouvertes.fr/hal-01266137
Contributeur : Yasmine Masmoudi <>
Soumis le : mardi 2 février 2016 - 10:38:24
Dernière modification le : mardi 27 mars 2018 - 16:06:18

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Yasmine Masmoudi, Arnaud Rigacci, Pierre Ilbizian, François Cauneau, Patrick Achard. Diffusion During the Supercritical Drying of Silica Gels. Drying Technology: An International Journal, 2006, 24 (9), pp.1121-1125. 〈10.1080/07373930600778270〉. 〈hal-01266137〉

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