Abstract: Nanoscale, pyrogenically produced oxides and/or mixed oxides having a BET surface area of between 1 m2/g and 600 m2/g and a chloride content of less than 0.05 wt. % are produced by converting organometallic and/or organometalloid substances into the oxides at temperatures of above 200° C. The oxides may be used as a polishing agent in the electronics industry (CMP).

Abstract: Surface-modified zinc oxides with a BET surface area of 18±5 m2/g and a C content of 0.1 to 5.0 wt. % are prepared by spraying the zinc oxides with the surface-modifying agent or adding this in vapour form and then heat-treating the mixture. They can be employed for the preparation of cosmetics.

Abstract: A dispersion of pyrogenically produced cerium oxide, which does not contain any particles larger than 1 ?m, is produced by dispersing a pyrogenically produced cerium oxide in water by means of a dissolver, centrifuging it, separating the supernatant from the bottom product, and again dispersing the supernatant by means of ultrasound. The dispersion can be used for chemical-mechanical polishing (CMP).

Abstract: Hydrophobic, pyrogenically produced silica having a tamped density of 55 to 200 g/l is produced by hydrophobizing pyrogenically produced silica and then compacting it. The silica may be used for the production of dispersions.

Abstract: Nanoscale, pyrogenically produced oxides and/or mixed oxides having a BET surface area of between 1 m2/g and 600 m2/g and a chloride content of less than 0.05 wt. % are produced by converting organometallic and/or organometalloid substances into the oxides at temperatures of above 200° C. The oxides may be used as a polishing agent in the electronics industry (CMP).

Abstract: Indium-tin oxides with the following physical and chemical properties: 1 Mean primary particle size 1 to 200 obtained from TEM BET surface (DIN 66131) 0.1 to 300 m2/g Structure XRD cubic indium oxide tetragonal tin oxide Mesopores according to the 0.03 mL/g to 0.30 mL/g BJH method (DIN 66134) Macropores (DIN 66133) 1.5 to 5.

Abstract: Nanoscalar, pyrogenically produced yttrium-zirconium mixed oxide which has a BET surface area of between 1 and 600 m2/g, a total chloride content of less than 0.05 wt. % and does not exhibit a conversion into the monoclinic phase during storage is produced by atomizing yttrium compounds and zirconium compounds and reacting them in a flame. The mixed oxide can be used as ceramic raw material.

Abstract: A method for the quantitative determination of silica oil or siloxane concentrations present in trace quantities in silicas or pyrogenic oxides by the quantitative evaluation of proton spectra is presented. The silica or pyrogenic oxide of interest is dispersed in a suitable organic solvent and the phases are then separated. The liquid phase is evaporated to a dry residue which is then redissolved in a deuterated solvent. The redissolved residue is evaluated quantitatively by proton NMR spectroscopy to determine the concentration of silica oil or siloxane by measuring the integral of the methyl silyl protons present in the 1H spectra and comparing same to the integral of the deuterated solvent.

Abstract: Hydrophobic, pyrogenically produced silica having a tamped density of 55 to 200 g/l is produced by hydrophobizing pyrogenically produced silica and then compacting it. The silica may be used for the production of dispersions.

Abstract: Granular products with individual granules with virtually spherical particles of a homogeneous density distribution are produced by converting solids into suspensions, atomizing the suspensions and drying them by sublimation drying.

Abstract: Nanoscale, pyrogenically produced oxides and/or mixed oxides having a BET surface area of between 1 and 600 m2/g and a chloride content of less than 0.05 wt. % are produced by converting organometallic and/or organometalloid substances into the oxides at temperatures of above 200° C.

Abstract: Surface-modified, pyrogenically produced aluminum oxide which is has the following physico-chemical properties:______________________________________ Surface (m.sup.2 /g) 50 to 150 Stamping density (g/l) 50 to 90 Drying loss (%) <5 Annealing loss (%) 5.0 to 15 C content (%) 0.5 to 12 pH 4 to 8.

Abstract: Surface-modified, pyrogenically produced titanium dioxide which has the following physico-chemical properties:______________________________________ Surface (m.sup.2 /g) 5 to 120 Stamping density (g/l) 50 to 250 Drying loss (%) <5 Annealing loss (%) 3.5 to 15 Carbon content (%) 0.5 to 12 pH 4 to 10.

Abstract: Surface-modified, pyrogenically produced aluminum oxide which has the following physico-chemical properties:______________________________________ Surface (m.sup.2 /g) 50 to 150 Stamping density (g/l) 50 to 90 Drying loss (%) <5 Annealing loss (%) 5.0 to 15 C content (%) 0.5 to 12 pH 4 to 8.

Abstract: Surface-modified, pyrogenically produced titanium dioxide which is has the following physico-chemical properties:______________________________________ Surface (m.sup.2 /g) 5 to 120 Stamping density (g/l) 50 to 250 Drying loss (%) <5 Annealing loss (%) 3.5 to 15 Carbon content (%) 0.5 to 12 pH 4 to 10.