Interpretation of mercury porosimetry applied to aerogels

Author:

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

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.

Publisher

Springer Science and Business Media LLC

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Reference8 articles.

1. 1 Fricke J. , in Aerogels, Proc. 1st Int. Symp., Würzburg, 23–25 Sept. 1985, edited by Fricke J. (Springer-Berlin, 1986), p. 13.

2. Studies on pore systems in catalysts XII. Pore distributions from the desorption branch of a nitrogen sorption isotherm in the case of cylindrical pores A. An analysis of the capillary evaporation process

3. 2 Broeker F. J. , Heckmann W. , Fischer F. , Mielke M. , Schoeder J. , and Stange A. , in Aerogels, Proc. 1st Int. Symp., Würzburg, 23–25 Sept. 1985, edited by Fricke J. (Springer-Berlin, 1986), p. 60.

4. On a Theory of the van der Waals Adsorption of Gases

5. Texture of Catalysts

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