ORBi: Gommes Cédric - In situ SAXS analysis of silica gel formation with an additive

Reference : In situ SAXS analysis of silica gel formation with an additive


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Physics Physical, chemical, mathematical & earth Sciences : Chemistry
	To cite this reference:	http://hdl.handle.net/2268/688

Title :	In situ SAXS analysis of silica gel formation with an additive
Language :	English
Author, co-author :	Gommes, Cédric [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
	Blacher, Silvia [Université de Liège - ULg > Département des sciences cliniques > Labo de biologie des tumeurs et du développement >]
	Goderis, Bart [Katholieke Universiteit Leuven - KUL > > > > > >]
	Pirard, René [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
	Heinrichs, Benoît [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
	Alié, Christelle [Université de Liège - ULg > > Chimie générale et chimie physique >]
	Pirard, Jean-Paul [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
Publication date :	1-Jul-2004
Journal title :	Journal of Physical Chemistry B
Publisher :	Amer Chemical Soc
Volume :	108
Issue/season :	26
Pages :	8983-8991
Audience :	International
ISSN :	1520-6106
City :	Washington
Abstract :	[en] Time-resolved small-angle X-ray scattering (SAXS) measurements performed during the formation of tetraethyl orthosilicate (TEOS) based silica gels in alcohol with 3-(2-aminoethylamino)propyltrimethoxysilane (EDAS) as an additive are reported. The measurements reveal no discontinuity of the nanostructure at the gel point. A chemically induced spinodal phase separation is found to give a coherent picture of the collected data. Increasing the amount of EDAS induces the phase separation on a smaller length scale, which finally leads to a modified gel morphology. The SAXS measurements and the electron micrographs associated with the dry gels could be interpreted in terms of the suggested wet gel formation mechanism.
Funders :	Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/2268/688

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