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Interpretation of mercury porosimetry applied to aerogels

Published online by Cambridge University Press:  03 March 2011

R. Pirard ,
S. Blacher ,
F. Brouers  and
J.P. Pirard
R. Pirard
Affiliation:
Université de Liège, Laboratories de Génie Chimique et d'Etude Physique des Matériaux, Institut de Chimie au Sart Tilman, batiment B6, B-4000 Liège. Belgium
S. Blacher
Affiliation:
Université de Liège, Laboratories de Génie Chimique et d'Etude Physique des Matériaux, Institut de Chimie au Sart Tilman, batiment B6, B-4000 Liège. Belgium
F. Brouers
Affiliation:
Université de Liège, Laboratories de Génie Chimique et d'Etude Physique des Matériaux, Institut de Chimie au Sart Tilman, batiment B6, B-4000 Liège. Belgium
J.P. Pirard
Affiliation:
Université de Liège, Laboratories de Génie Chimique et d'Etude Physique des Matériaux, Institut de Chimie au Sart Tilman, batiment B6, B-4000 Liège. Belgium
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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.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 8 , August 1995 , pp. 2114 - 2119
Copyright
Copyright © Materials Research Society 1995

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References

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