Bayerisches Zentrum Für Angewandte Energieforschung E.v. Zae Bayern

Bsh Hausgerate Gmbh

Bsh Hausgeraete Gmbh

Lena Weigold

Hans-Peter Ebert

Theresa Noisser

Gudrun Reichenauer

A porous SiO2 xerogel is produced using temporary pore fillers or solid skeletal supports, which are removed by thermal oxidation at the end of the production process (e.g. carbon or organic), by means of a sol-gel-process by subcritical drying of the gel. The SiOxerogel includes pores having a pore size from more than 50 nm to less than 1000 nm. The SiOxerogel has a density of less than 400 kg/m, a carbon content of less than 10%, a thermal conductivity at 800&#xb0; C. below 0.060 W/m*K, a thermal conductivity at 400&#xb0; C. below 0.040 W/m*K, and a thermal conductivity at 200&#xb0; C. below 0.030 W/m*K.

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In a method for producing a porous SiO-xerogel starting solution containing a silicon compound is provided and organic monomers and an organically modified alkoxysilane are added to the starting solution. During gelification of the silicon compound, the organic monomers and the organically modified alkoxysilane react in situ to form organic solid skeletal supports in the silicon network. The resulting gel is dried under subcritical conditions and the solid skeletal supports removed by thermal oxidation.

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Lena Weigold