[en] The effect of evaporative drying on the pore size of two series of hybrid silica gels is investigated by combining beam bending on the gels and mercury porosimetry on the aerogels and xerogels with transmission electron microscopy on the xerogels. It is shown that the shrinkage of the pores during drying is different in the two series: in one series the pores shrink proportionally to their volume, in the other the pores collapse until they all reach the same size. The experimental data enable us to discuss the relation between these two different behaviours and the different morphology of the two series of gels.
Disciplines :
Materials science & engineering Physics
Author, co-author :
Gommes, Cédric ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Génie catalytique
Blacher, Silvia ; 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
Scherer, G. W.
Language :
English
Title :
The microstructure of hybrid silica gels and its modification by evaporative and supercritical dryings
Publication date :
December 2007
Journal title :
Journal of Sol-Gel Science and Technology
ISSN :
0928-0707
eISSN :
1573-4846
Publisher :
Springer, Dordrecht, United States - Massachusetts
Volume :
44
Issue :
3
Pages :
211-218
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
