Article (Scientific journals)
Mercury porosimetry: applicability of the buckling-intrusion mechanism to low-density xerogels
Alié, Christelle; Pirard, René; Pirard, Jean-Paul
2001In Journal of Non-Crystalline Solids, 292 (1-3), p. 138-149
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Abstract :
[en] Mineral materials can be either crushed or invaded by mercury during mercury porosimetry experiments. It has been shown here that many low-density xerogels exhibit the two volume variation mechanisms successively, compaction followed by intrusion. when submitted to mercury porosimetry and that a unimodal pore size distribution can be obtained by applying Pirard's collapse model below the pressure of transition P-1 and Washburn's intrusion theory above P-t. To confirm the validity of the use of the buckling law, one low-density xerogel was wrapped in a tight membrane (intrusion is prevented and the sample is crushed during the whole porosimetry experiment). The analysis of the mercury porosimetry data of the wrapped sample by the buckling law leads to a continuous unimodal distribution similar to the distribution of the unwrapped sample obtained by applying the buckling law below P-t and the intrusion law above P-t. The position of P-t is characteristic of the tested material: when submitted to mercury pressure. aerogels and low-density xerogels only collapse in case of very small aggregates whereas they are crushed and then intruded in case of larger silica aggregates. The fact that compacted slabs of monodisperse non-aggregated silica spheres (of the same size range as the xerogels and aerogels) show only intrusion during mercury porosimetry experiments implies that the particles need to be aggregated so that the compaction mechanism takes place. The position of the change of mechanism from crushing to intrusion is not directly related to the size of the elementary particles but is linked to the size of the aggregates of silica particles. (C) 2001 Elsevier Science B.V. All rights reserved.
Disciplines :
Chemical engineering
Materials science & engineering
Author, co-author :
Alié, Christelle ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie physique appliquée
Pirard, René ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie physique appliquée
Pirard, Jean-Paul ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie physique appliquée
Language :
English
Title :
Mercury porosimetry: applicability of the buckling-intrusion mechanism to low-density xerogels
Publication date :
2001
Journal title :
Journal of Non-Crystalline Solids
ISSN :
0022-3093
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
292
Issue :
1-3
Pages :
138-149
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 28 August 2009

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