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Interpretation of mercury porosimetry applied to aerogels

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Abstract

The observation of aerogels submitted to a pressure of mercury indicates that this porous material is compacted and not intruded by the mercury. Consequently, the classical Washburn equation cannot be applied. A relation is established between the pressure P of compaction and the size L of the largest pores. The size of pores is estimated by using the nitrogen adsorption-desorption isotherms analysis and SEM measurements. A relation is found in which P is proportional to L−4 The new relation is applied to mercury porosimetry. Finally, a mechanical model is proposed that reproduces successfully the behavior of aerogels under high pressure of mercury.

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Authors and Affiliations

  1. Laboratories de Génie Chimique et d’Etude Physique des Matériaux, Université de Liège, Institut de Chimie au Sart Tilman, batiment B6, B-4000, Liège, Belgium

    R. Pirard, S. Blacher, F. Brouers & J. P. Pirard

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  1. R. Pirard
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  2. S. Blacher
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  3. F. Brouers
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  4. J. P. Pirard
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Pirard, R., Blacher, S., Brouers, F. et al. Interpretation of mercury porosimetry applied to aerogels. Journal of Materials Research 10, 2114–2119 (1995). https://doi.org/10.1557/JMR.1995.2114

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  • DOI: https://doi.org/10.1557/JMR.1995.2114

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