Article (Scientific journals)
Multigram scale synthesis and characterization of low-density silica xerogels
Alié, Christelle; Tcherkassova, Natalia; Ferauche, Fabrice et al.
2006In Journal of Non-Crystalline Solids, 352 (26-27), p. 2763-2771
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Keywords :
porosity; silica; sol-gels (xerogels)
Abstract :
[en] The synthesis of silica with preserved porosity and tailored morphology by sol-gel process can be achieved by hybrid organic-inorganic synthesis: a modified alkoxide, viz. 3-(2-aminoethylamino)propyltrimethoxysilane (EDAS), is introduced during the base catalysed synthesis with TEOS as main silica precursor. Additives with methoxy groups induce a nucleation mechanism because of their higher reactivity compared to main reagents with ethoxy groups. The nucleation model presented in previous papers was refined by taking into account the porosity of the particles and calculating the number of additive molecules by nucleus for each value of the ratio of additive/main reagent. The extrapolation of the synthesis process to semi-industrial scale goes through the replacement of laboratory grade reagents by industrial grade reagents and the scaling up to the production of higher quantities. At each of these two steps, the morphology and porosity of the samples has been compared to those of laboratory grade samples. It was shown that the texture and particle size has quasi totally been preserved. (c) 2006 Elsevier B.V. All rights reserved.
Disciplines :
Chemistry
Chemical engineering
Materials science & engineering
Author, co-author :
Alié, Christelle ;  Université de Liège - ULiège > Département de Chimie appliquée > Génie chimique - Chimie physique appliquée
Tcherkassova, Natalia ;  Centre Hospitalier Universitaire de Liège - CHU > Département de Chimie appliquée > Génie chimique - Chimie physique appliquée
Ferauche, Fabrice;  Université de Liège - ULiège > Département de Chimie appliquée > Génie chimique - Chimie physique appliquée
Lambert, Stéphanie  ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie physique appliquée
Heinrichs, Benoît ;  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 :
Multigram scale synthesis and characterization of low-density silica xerogels
Publication date :
01 August 2006
Journal title :
Journal of Non-Crystalline Solids
ISSN :
0022-3093
Publisher :
Elsevier Science Bv, Amsterdam, Netherlands
Volume :
352
Issue :
26-27
Pages :
2763-2771
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 25 August 2009

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