Abstract: Multilayer composite materials with at least one aerogel-containing layer and at least one other layer, a process for producing the same and their use are disclosed. The aerogel-containing layer(s) further contain at least one binder.

Abstract: The invention concerns a coated sheet which includes an aerogel layer, a method of manufacturing the coated sheet and its use.

Abstract: Organically modified aerogels, processes for their preparation by surface modification of the aqueous gel, without prior solvent exchange, and subsequent drying, and their use

Abstract: The invention relates to the use of inorganic aerogels as an auxiliary and/or excipient for pharmaceutical active compounds and/or preparations.

Abstract: The present invention relates to a process for the preparation of organically modified aerogels, comprising a) the preparation of a silicic acid sol having a pH of ≦4.0 from an aqueous water glass solution, with the aid of at least one organic and/or inorganic acid; b) polycondensation of the resulting silicic acid sol to a SiO2 gel by the addition of a base; c) washing the gel obtained in Step b) with an organic solvent until the water content of the gel is ≦5% by weight; d) surface-silylating the gel obtained in Step c), and e) drying the surface-silylated gel obtained in Step d), characterized in that at least one acid forms difficultly soluble salts with the cations of the water glass in the silicic acid sol, and that before Step b) the resulting difficultly soluble salts are extensively precipitated and separated from the silicic acid sol.

Abstract: The invention relates to a process for preparing organofunctionally modified aerogels by gelling a water glass by means of polycondensation and then converting it, by drying while retaining the structure of the gel, to give an aerogel, which process comprises reacting the gel, before drying, with an at least bifunctional organic compound, at least one functional group serving as a bond to the aerogel, while the remainder are retained, to aerogels which are obtainable by the novel process, and to their use.

Abstract: The inventive process concerns the preparation of organically modified aerogels and their use.The process the invention comprises:a) introducing a siliceous lyogel or hydrogel,b) optionally subjecting the gel prepared in a) to complete or partial solvent exchange with an organic solvent,c) reacting the gel obtained in step a) or b) with at least one silylation agent,d) optionally washing the silylated gel obtained in step c) with an organic solvent, ande) drying the gel obtained in step c) or d) subcritically, which comprises reacting in step c) the gel obtained in step a) or b) with at least one chlorine-free silylation agent.

Abstract: The invention relates to a process for producing aerogels with permanently hydrophobic surface groups, in which a) silicate lyogel is provided, b) the gel provided in step a) is washed with an organic solvent, c) the gel obtained in step b) is surface silylated and d) the surface-silylated gel obtained in step c) is dried, where the organic solvent used in step b) is a diether of formula (I) R.sup.1 --O--(CH.sub.2).sub.n --O--R.sup.2 in which R.sup.1 and R.sup.2 are mutually independently the same or different alkyl groups with 1 to 4 C atoms and n is a natural number in the range from 1 to 5.

Abstract: The present invention relates to a composite material that contains 5 to 97%-vol aerogel particles and at least one adhesive and that is characterised in that the diameter of the aerogel particles is smaller than 0.5 mm, a process for manufacturing this, and the use thereof.

Abstract: The invention relates to a process for the preparation of aerogels having hydrophobic surface groups, consisting ofa) taking a silicate-type lyogel,b) optionally subjecting the lyogel taken in Step a) to a solvent exchange with another solvent,c) surface-modifying the gel obtained in Step a) or b) with at least one C.sub.1 -C.sub.6 -alcohol, andd) drying, under subcritical conditions, the surface-modified gel obtained in Step c).

Abstract: The invention concerns a process for preparing organically modified aerogels, in which a) a silicic acid sol with a pH .ltoreq.4.0 is produced from an aqueous potassium silicate solution using at least one organic and/or inorganic acid; b) the resultant silicic acid sol is polycondensed by the addition of a base to form SiO.sub.2 gel; c) the gel produced in step b) is washed with an organic solvent until the water content of the gel is .ltoreq.5 wt %; d) the gel obtained in step c) is surface-modified with at least one C.sub.1-6 alcohol; and e) the surface-modified which are difficult to dissolve in the silicic acid sol. Before step b), the resultant salts, which are difficult to dissolve, are precipitated to the greates possible extent and separated from the silicic acid sol.

Abstract: The invention relates to a process for the production of modified SiO.sub.2 aerogels in whicha) a silicatic lyogel is prepared,b) if desired, the lyogel prepared in step a) is subjected to a solvent exchange with another organic solvent,c) the gel obtained in step a) or b) is reacted with at least one chlorine-free silylating agent, andd) the gel obtained in step c) is dried subcritically,wherein the chlorine-free silylating agent is a compound of the formula I ##STR1## wherein each R.sup.1 is identical or different and is selected from a group consisting of linear C.sub.1 -C.sub.6 -alkyl radicals, branched C.sub.1 -C.sub.6 -alkyl radicals, cyclohexyl radicals and phenyl radicals,R.sup.2, R.sup.3 and R.sup.4 are identical or different and are selected from the group consisting of hydrogen atoms, linear C.sub.1 -C.sub.6 -alkyl radicals, branched C.sub.1 -C.sub.6 -alkyl radicals, cyclohexyl radicals and phenyl radicals;and n=1, 2 or 3.

Abstract: SiO.sub.2 aerogels containing carbon particles are obtainable by heatinga) organically modified SiO.sub.2 aerogels in the presence of at least one pyrolyzable hydrocarbon gas and/or at least one inert gas orb) organically unmodified SiO.sub.2 aerogels in the presence of at least one pyrolyzable hydrocarbon gas and in the presence or absence of inert gases to 600.degree.-1300.degree. C.