Porous sio2-xerogel with a characteristic pore size, stable drying precursors thereof and use of same
AssigneesBayerisches Zentrum für Angewandte Energieforschung e.V., BSH Bosch und Siemens Hausgerate GmbH
InventorsHans-Peter Ebert, Theresa Noisser, Gudrun Reichenauer, Lena Weigang
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Abstract
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 SiO2 xerogel includes pores having a pore size from more than 50 nm to less than 1000 nm. The SiO2 xerogel has a density of less than 400 kg/m3, a carbon content of less than 10%, a thermal conductivity at 800° C. below 0.060 W/m*K, a thermal conductivity at 400° C. below 0.040 W/m*K, and a thermal conductivity at 200° C. below 0.030 W/m*K.
Claims15
1-8. (canceled)
A porous SiO2 xerogel, comprising pores having a pore size from more than 50 nm to less than 1000 nm, wherein the gel has a density of less than 400 kg/m3, a carbon content of less than 10%, a thermal conductivity at 800° C. below 0.060 W/m*K, a thermal conductivity at 400° C. below 0.040 W/m*K, and a thermal conductivity at 200° C. below 0.030 W/m*K.
Dependencies are inferred from the claim text.