Abstract: The present invention relates to the use of aerogels as carrier materials for active substances in agriculture and/or veterinary medicine.

Abstract: The present invention relates to novel, organically modified aerogels, uses thereof, and a process for producing them in which a) a hydrogel is introduced as an initial charge, b) the hydrogel obtained in step a) is subjected to surface modification, and c) the surface-modified gel obtained in step b) is dried. The present invention additionally relates to novel, organically modified wet gels, to a process for producing them, and to their use.

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: A method of producing substantially spherical lyogels in water insoluble silylating agents is provided. The present invention refers to a method of producing substantially spherical lyogels in which a) a lyosol is provided, b) the lyosol obtained in step a) is transferred to at least one silylating agent in which the lyosol is insoluble, and c) the spherical lyosol formed in step b) is gelatinised in at least one silylating agent in which the lyosol is likewise insoluble, to produce the lyogel.

Abstract: A process for producing an SiO2 shaped body which is at least partially vitrified, wherein an amorphous, porous SiO2 green body is sintered or vitrified by contactless heating by means of radiation, while avoiding contamination to the SiO2 shaped body with foreign atoms, wherein the radiation used is the beam of a laser at a subatmospheric pressure below 1000 mbar.

Abstract: Silicone nitride coated shaped bodies of silica are prepared by coating a silica green body with silicon nitride or a precursor thereof, followed by sintering the silicone nitride coating by means of a laser beam. The shaped bodies are especially useful as “solar crucibles” in production of polycrystalline silicon for solar cells.

Abstract: A silica glass crucible is produced by a) providing a porous amorphous silica glass green body, which is infiltrated with at least one substance that promotes crystallization of a silica glass crucible, b) drying the infiltrated silica glass green body, c) filling the green body with a metal or semimetal, and d) heating the filled green body for a period of from 1 h to 1000 h to a temperature of from 900 to 2000° C. to form at least a portion of silica crystalline phase. The process may be continued by further heating to melt the metal or semimetal and pulling a single crystal from the melt.

Abstract: A process for producing an SiO2 shaped body which is at least partially vitrified, wherein an amorphous, porous SiO2 green body is sintered or vitrified by contactless heating by means of radiation, while avoiding contamination to the SiO2 shaped body with foreign atoms, wherein the radiation used is the beam of a laser at a subatmospheric pressure below 1000 mbar.

Abstract: A method for the production of a homogenous, shaped SiO2 body of near net shape wherein amorphous SiO2 particles comprising relatively large amorphous SiO2 particles and relatively small amorphous SiO2 particles are electrophoretically deposited from an aqueous dispersion on an electrically nonconductive membrane, the shape and geometry of which correspond to the shaped SiO2 body to be produced, wherein the membrane has an average pore size which is larger than the average particle size of the smaller amorphous SiO2 particles.

Abstract: A process for producing an SiO2 shaped body which is at least partially vitrified, wherein an amorphous, porous SiO2 green body is sintered or vitrified by contactless heating by means of radiation, while avoiding contamination to the SiO2 shaped body with foreign atoms, wherein the radiation used is the beam of a laser at a subatmospheric pressure below 1000 mbar.

Abstract: The invention relates to a method for producing porous SiO2 green bodies having an extremely high green density, or porous SiO2 green bodies having an internal density gradient which is adjusted in a targeted manner. The inventive method is characterised in that a porous SiO2 green body known per se and consisting of amorphous SiO2 is redensified by electrophoretically depositing SiO2 particles in the pores of the green body.

Abstract: Extremely high solids content silica dispersions are useful for forming green bodies of near net shape as compared to the shape of the bodies after sintering. The green bodies are particularly useful for sintering to form low impurity-containing crucibles for single crystal silicon production.

Abstract: A method of producing substantially spherical lyogels in water insoluble silylating agents. The present invention refers to a method of producing substantially spherical lyogels in which a) a lyogel is provided, b) the lyosol obtained in step a) is transferred to at least one silylating agent in which the lyosol is insoluble, and c) the spherical lyosol formed in step b) is gelatinised in at least one silylating agent in which the lyosol is likewise insoluble, to produce the lyogel.

Abstract: A silica glass crucible is produced by

Abstract: Aerogel particles, in particular in the form of composite materials, are used to deaden structure-borne and/or impact sounds.

Abstract: A process for producing an SiO2 shaped body which is vitrified in a partial region or completely, in which process an amorphous, porous SiO2 preform is sintered or vitrified by contactless heating by means of laser radiation, by means of which contamination of the SiO2 shaped body with foreign atoms is avoided.

Abstract: Multilayer composite materials with at least one aerogel-containing layer and at least one layer containing polyethylene terephthalate fibres, process for producing the same and their use.

Abstract: The invention relates to a method of producing aerogels and to an apparatus for carrying out the method. The aerogels are produced semi-continuously by per se known methods in that, following gel formation, the lyogel is transferred to a mobile container for at least two further procedural steps, the container comprising inlets and outlets and in that for these procedural steps, the container is moved to appropriate stations for the supply and discharge of materials, at which stations it is connected to feed and discharge means and in that the procedural steps are carried out there. An apparatus for carrying out the method comprises a container with a container top part and container bottom part, an encircling seal and a bag adapted to be placed into the container, the bag being connected along the opening and at least partially to thickening elements, container top and bottom parts being connected along their periphery in gastight fashion to corresponding parts of a retaining device.

Abstract: The present invention refers to a method of producing organically modified aerogels on a basis of silicon tetrachloride in which: a) a hydrogel is obtained by direct reaction of silicon tetrachloride with water, b) the hydrogel obtained in step a) is surface-modified, and c) the surface-modified gel obtained in step b) is dried.

Abstract: Process for preparation of hydrophilic or partially hydrophilic inorganic aerogels. The invention relates to a process for the preparation of hydrophilic or partially hydrophilic inorganic aerogels, which comprises pyrolyzing a hydrophobic inorganic aerogel in the presence of oxygen at temperatures in the range from 100 to 1000° C.