[en] Some silica low-density xerogels exhibit two successive volume variation mechanisms, compaction and intrusion when submitted to mercury porosimetry. The position of the pressure of transition P-t between the two mechanisms is characteristic of the tested material and allows to compute the buckling constant used to determine the pore size distribution in the compaction part of the experiment. The analysis of the mercury porosimetry data of a low-density xerogel wrapped in a tight membrane by the buckling law (intrusion is prevented and the sample is crushed during the whole porosimetry experiment) 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. This experiment confirms the validity of the use of the buckling law. The behaviour of the low-density xerogels can be related to one of their morphological characteristics. As the size of the aggregates of silica particles increases, the strength towards crushing increases and the change of mechanism from crushing to intrusion takes place at a lower pressure. (C) 2001 Elsevier Science B.V. All rights reserved.
Disciplines :
Materials science & engineering Chemical 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 applied to porous silica materials: successive buckling and intrusion mechanisms
Publication date :
2001
Audience :
International
Journal title :
Colloids and Surfaces A: Physicochemical and Engineering Aspects
ISSN :
0927-7757
eISSN :
1873-4359
Publisher :
Elsevier Science
Volume :
187
Pages :
367-374
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Scherer G.W., Smith D.M., Stein D. J. Non-Cryst. Solids 1995, 186:309.
.
Pirard R., Pirard J.P. J. Non-Cryst. Solids 1997, 212:262.
Pirard R., Blacher S., Brouers F., Pirard J.P. J. Mater. Res. 1995, 10:2114.
Pirard R., Heinrichs B., Pirard J.P., McEnaney B., Mays T.J., Rouquerol J., Rodriguez-Reinoso F., Sing K.S.W., Unger K.K. (Eds.), Characterisation of Porous Solids IV, Cambridge: The Royal Society of Chemistry; 1997, 460.
Pirard R., Sahouli B., Blacher S., Pirard J.P. J. Coll. Interf. Sci. 1999, 217:216.
.
Alié C., Pirard R., Lecloux A.J., Pirard J.P. J. Non-Cryst. Solids 1999, 246:216.
.
Lecloux A.J. Catalysis: Science and Technology , Anderson J.R., Boudart M. (Eds.), Berlin: Springer; 1981, 2:171.
Washburn E.W. Proc. Natl. Acad. Sci. 1921, 7:115.
Scherer G.W., Smith D.M., Qiu X., Anderson J.M. J. Non-Cryst. Solids 1995, 186:316.
Pirard R., Heinrichs B., Van Cantfort O., Pirard J.P. J. Sol-Gel Sci. Technol. 1998, 13:335.