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Synthesis of SiO2-TiO2xerogels by sol-gel process

✍ Scribed by A. Pirson; A. Mohsine; P. Marchot; B. Michaux; O. Cantfort; J. P. Pirard; A. J. Lecloux

Publisher
Springer
Year
1995
Tongue
English
Weight
509 KB
Volume
4
Category
Article
ISSN
0928-0707

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✦ Synopsis

A new method to synthesize SiO2-TiO2 gels by sol-gel process has been developed. This technique uses tetraisopropylorthotitanate [Ti(Oipr)4] and tetraethylorthosilicate [TEOS]: they are mixed in the same solvent and then directly hydrolysed. This one-step reaction is possible because of the use of 2-methoxyethanol, a protic polar solvent. This alcohol plays two different specific roles: it acts as a solvent as well as a stabilizer of titanium alkoxide towards the hydrolysis-precipitation reaction. So, by an accurate adjustment of the quantity of methoxyethanol in the mixture, we can control the reactivity of the titanium precursor.

Monolithic and transparent xerogels were obtained whatever the composition. Three monolithic SiO2-TiO2 gels

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