Process for the preparation of monolithic silica aerogels
Résumé
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