Process for producing monolithic silica aerogels; silica...

C - Chemistry – Metallurgy – 01 – B

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C01B 33/16 (2006.01) C01B 33/158 (2006.01)

Patent

CA 2180236

Ce procédé pour la fabrication d'aérogels de silice monolithiques consiste : - à hydrolyser et polycondenser en milieu acide un mélange à base d'un composé organique du silicium et d'un solvant organique constitué par de l'éthylacétoacétate, de telle sorte à obtenir un gel transparent ; - puis, à substituer le solvant organique par du dioxyde de carbone liquide ; - et enfin, à évacuer le dioxyde de carbone sous conditions de supercriticité dudit dioxyde de carbone afin d'obtenir un aérogel.

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