| abstract |
A method for producing an airgel material having a porosity of at least 0.55 and an average pore diameter of 10 nm to 500 nm, comprising the following steps: a) preparing and optionally activating a sol; b) filling the casting mold (10) with a sol; c) gelling the sol, thereby producing a gel (4) and then aging the gel; At least one of the following steps d) and e): d) replacing the liquid in the pores with a solvent; e) chemically modifying the aged and optionally solvent exchanged gel (6) with a reactant, followed by and f) drying the gel, thereby forming an airgel material. The casting mold used in step b) is provided with a plurality of channel forming elements (2), the plurality of channel forming elements being along a specific minimum length L defined in the channel direction of the elements, Any position of the sol filled in the casting mold is configured to have a maximum distance X from the channel forming element that satisfies the condition X ≦ 15 mm and L / X> 3. |