Process for the preparation of monolithic silica aerogels

Gérard Pajonk , Elimane Elaloui , Redouane Begag , Marcel Durant , Bruno Chevalier (1) , Jean-Luc Chevalier , Patrick Achard (2)

1 CSTB - Centre Scientifique et Technique du Bâtiment
2 CEP - Centre Énergétique et Procédés

A process for the preparation of a silica aerogel that includes subjecting a mixture that includes an organosilicon compound and ethyl acetoacetate to hydrolysis and polycondensation in an acidic medium to obtain a transparent gel. The organic solvent is substituted by liquid carbon dioxide and the carbon dioxide is evacuated under supercritical conditions of the carbon dioxide to obtain an aerogel

Mots clés: silica aerogel

Domaines: Energétique

Gérard Pajonk, Elimane Elaloui, Redouane Begag, Marcel Durant, Bruno Chevalier, et al.. Process for the preparation of monolithic silica aerogels. United States, Patent n° : US5795557. 1998, 7 p. ⟨hal-00617987⟩