Abstract: The present invention relates to cross-linked polysiloxanes containing organic bridging groups Ver, a method for preparing said cross-linked polysiloxanes, blends containing said polysiloxanes and fillers, a method for biobased degradation of said polysiloxanes, the use of the organic bridging groups Ver, the precursors of which contain non-terminal functional groups and/or heteroatoms, in the cross-linked polysiloxanes for the biobased degradation of the cross-linked polysiloxanes by means of a biobased agent, and the use of the cross-linked polysiloxanes and the blend for industrial applications.

Abstract: A method for producing an optoelectronic component is described with the steps of providing monomeric structural units, providing nanoparticles in a liquid medium, mixing the monomeric structural units and the nanoparticles in the liquid medium so that a starting sol is formed, introducing an acid into the starting sol to adjust a pH value, at least partial condensation of the monomeric structural units to form a network, wherein the nanoparticles are at least partially covalently bonded to the network, so that a sol-gel material is formed, applying the sol-gel material to a semiconductor chip, curing the sol-gel material to form a coating material. Furthermore, an optoelectronic component is specified.

Abstract: The present invention relates to a sedimentation-stable sol which, in addition to a copper(II) salt, also comprises at least one further metallic salt, an additive which is contained ensuring that the metallic salts contained in the sol remain dissolved or in dispersion. Furthermore, the sol is suitable in the method according to the invention for producing a metallic mixed oxide layer on a substrate, the metallic mixed oxide layer having a delafossite structure. Likewise, a substrate which has a metallic mixed oxide layer with a delafossite structure and also possibilities of use thereof are indicated according to the invention.

Abstract: In a gas sensor with at least two electrodes and with a sensor body which is connected thereto and is composed of a gas-sensitive material, in addition to pores which may already be present, second cavities are provided in the sensor body. The second cavities may be suitable on account of their size to facilitate and accelerate the distribution of gas molecules in the sensor body and to thus improve the time response of the gas sensor.

Abstract: The invention relates to a method for producing stable suspensions of finely dispersed colloidal crystalline titanium dioxide particles, comprising the hydro-thermal treatment of aqueous molecularly disperse sol-gel solutions prepared from amorphous water-soluble precursor powders. The suspensions thus obtained can be used, inter alia, for the production of thin transparent crystalline layers.

Abstract: In a gas sensor with at least two electrodes and with a sensor body which is connected thereto and is composed of a gas-sensitive material, in addition to pores which may already be present, second cavities are provided in the sensor body The second cavities may be suitable on account of their size to facilitate and accelerate the distribution of gas molecules in the sensor body and to thus improve the time response of the gas sensor.

Abstract: A sol-gel process for producing layers of zirconium oxide is described which comprises the following stages: (i) production of a soluble, zirconium-containing powder by: (a) reaction of a zirconium alcoholate of the general formula Zr(OR)4, in which the residues R are the same or different and represent straight-chain, branched or cyclic alkyl or alkenyl residues with 1 to 10 carbon atoms, which optionally exhibit one or more carbonyl and/or ester and/or carboxyl functions, with one or more polar compounds having complexing, chelating properties, (b) heating the solution, (c) mixing the solution with water, optionally in the presence of a catalyst, (d) concentrating the solution until a powder is obtained, (ii) dissolving the powder forming a sol, (iii) coating a substrate with the sol, and (iv) annealing the coated substrate.

Abstract: A sol-gel process for producing layers of zirconium oxide is described which comprises the following stages: (i) production of a soluble, zirconium-containing powder by: (a) reaction of a zirconium alcoholate of the general formula Zr (OR)4, in which the residues R are the same or different and represent straight-chain, branched or cyclic alkyl or alkenyl residues with 1 to 10 carbon atoms, which optionally exhibit one or more carbonyl and/or ester and/or carboxyl functions, with one or more polar compounds having complexing, chelating properties, (b) heating the solution, (c) mixing the solution with water, optionally in the presence of a catalyst, (d) concentrating the solution until a powder is obtained, (ii) dissolving the powder forming a sol, (iii) coating a substrate with the sol, and (iv) annealing the coated substrate.

Abstract: A method of making porous ceramics of lead titanate (PT) or lead zirconate PZT) of a Pb(Zr.sub.x Ti.sub.1-x) O.sub.3 compound from a gel made by mixing at least 2.5 equivalents of water based on the compound with a solution prepared from a polar solvent having complexing and chelating properties, one or more Pb(II) and PB(IV) carboxylates and at least one compound including titanium and zirconium of the general formula M(OR).sub.4 where M is titanium or zirconium and R is similar or different groups representing at least one of a straight chain, cross-linked and cyclic alkyl and alkenyl group with 1 to 10 carbon atoms, aging the resulting gel beyond its gel point, replacing the solvent in the pores of the gel by a chelating solvent, drying the resulting gel under supercritical conditions and tempering the resulting aerogel.