Multigram scale synthesis and characterization of low-density silica xerogels

Autor:	Fabrice Ferauche, Benoît Heinrichs, Stéphanie Lambert, Christelle Alié, Jean-Paul Pirard, René Pirard, Natalia Tcherkassova
Rok vydání:	2006
Předmět:	Materials science Nucleation Condensed Matter Physics Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Chemical engineering Reagent Alkoxide Materials Chemistry Ceramics and Composites Alkoxy group Organic chemistry Particle size Hybrid material Porosity Sol-gel
Zdroj:	Journal of Non-Crystalline Solids. 352:2763-2771
ISSN:	0022-3093
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::fbc68efcf8bf9417107fd0cb308dee9c https://doi.org/10.1016/j.jnoncrysol.2006.03.054 Zobrazit plný text záznamu Full Text from ScienceDirect