Reference : Preparation of low-density xerogels from mixtures of TEOS with substituted alkoxysila...
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
Preparation of low-density xerogels from mixtures of TEOS with substituted alkoxysilanes. I. O-17 NMR study of the hydrolysis-condensation process
Alié, Christelle mailto [Université de Liège - ULg > Département de Chimie appliquée > Chimie physique appliquée > >]
Pirard, Jean-Paul mailto [Université de Liège - ULg > Département de chimie appliquée > Chimie physique appliquée > >]
Journal of Non-Crystalline Solids
Elsevier Science Bv
Yes (verified by ORBi)
[en] Low-density xerogels were synthesised by incorporation of an additive to base catalysed tetraethylorthosilicate (TEOS) alcogels directly during the preparation of the sol. The nucleation mechanism by the additive was established by experiments during sol-gel transition. O-17 NMR spectroscopy on TEOS-ethanol-water, 3-(2-aminoethylamino)propyltrimethoxysilane (EDAS)-ethanol-water and EDAS-TEOS-ethanol-water solutions shows that the hydrolysis-condensation of EDAS is much faster than that of TEOS. Consequently it can be assumed that EDAS forms nuclei, onto which TEOS condenses later to form the silica particles. (C) 2003 Elsevier Science B.V. All rights reserved.

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