Patent application number | Description | Published |
20090136757 | METHOD OF FRACTIONATING OXIDIC NANOPARTICLES BY CROSSFLOW MEMBRANE FILTRATION - A method of fractionating a dispersion of oxidic nanoparticles wherein at least one step of the method is a membrane crossflow filtration step, the flow of the dispersion over the membrane being brought about by means of driven rotating parts; and dispersions of oxidic nanoparticles that are obtainable by the method. | 05-28-2009 |
20100008872 | SILICA COATED ZINC OXIDE PARTICLES OBTAINABLE BY A FLAME PYROLYSIS PROCESS - Zinc silicon oxide particles with a core-shell structure which have a Zn/Si ratio of from 2 to 75, in atom %/atom %, whose fraction of Zn, Si and O is at least 99% by weight, based on the zinc silicon oxide particles, which have a BET surface area of from 10 to 60 m | 01-14-2010 |
20100083584 | DISPERSION COMPRISING CERIUM OXIDE AND SHEET SILICATE - A dispersion comprising cerium oxide particles and particles of one or more sheet silicates, where the zeta potential of the sheet silicate particles is negative and that of the cerium oxide particles is positive or equal to zero, and the zeta potential of the dispersion is negative overall, the mean particle diameter of the cerium oxide particles and the mean particle diameter of the sheet silicate particles is not more than 100 nm and the pH of the dispersion is from 7.5 to 10.5, preferably from 9 to 10. | 04-08-2010 |
20100102268 | DISPERSION COMPRISING CERIUM OXIDE AND COLLOIDAL SILICON DIOXIDE - A dispersion comprising cerium oxide particles and colloidal silicon dioxide particles, where—the zeta potential of the silicon dioxide particles is negative and that of the cerium oxide particles is positive or equal to zero, and the zeta potential of the dispersion is negative overall, and—the mean particle diameter of the cerium oxide particles is not more than 200 nm and that of the silicon dioxide particles is not more than 100 nm, the mean particle diameter of the cerium oxide particles being greater than that of the silicon dioxide particles—the cerium oxide/silicon dioxide weight ratio is from 1.1:1 to 100:1 and—the pH of the dispersion is from 7.5 to 10.5. | 04-29-2010 |
20100163785 | DISPERSION COMPRISING CERIUM OXIDE, SILICON DIOXIDE AND AMINO ACID - A dispersion comprising particles of cerium oxide and colloidal silicon dioxide and in each case one or more aminocarboxylic acids and/or salts thereof, where the zeta potential of the silicon dioxide particles is negative and that of the cerium oxide particles is positive or equal to zero, and the zeta potential of the dispersion is negative overall, the mean diameter of the • cerium oxide particles is not more than 200 nm silicon dioxide particles is less than 100 nm, the content, based in each case on the total amount of the dispersion, of • cerium oxide particles is from 0.1 to 5% by weight silicon dioxide particles is from 0.01 to 10% by weight and • aminocarboxylic acid or salt thereof is from 0.01 to 5% by weight and —the pH of the dispersion is from 7.5 to 10.5. | 07-01-2010 |
20100171069 | DISPERSION COMPRISING CERIUM OXIDE, SILICON DIOXIDE AND AMINO ACID - A dispersion comprising particles of cerium oxide and sheet silicate and one or more aminocarboxylic acids and/or salts thereof, where the zeta potential of sheet silicate particles is negative and that of the cerium oxide particles is positive or equal to zero, and the zeta potential of the dispersion is negative overall, the mean diameter of the•cerium oxide particles is not more than 200 nm•sheet silicate particles is less than 100 nm, the content, based in each case on the total amount of the dispersion, of•cerium oxide particles is from 0.1 to 5% by weight•sheet silicate particles is from 0.01 to 10% by weight and•aminocarboxylic acid or salt thereof is from 0.01 to 5% by weight and the pH of the dispersion is from 7.5 to 10.5. | 07-08-2010 |
20100187174 | METHOD OF FRACTIONATING OXIDIC NANOPARTICLES BY CROSSFLOW MEMBRANE FILTRATION - A method of fractionating a dispersion of oxidic nanoparticles wherein at least one step of the method is a membrane crossflow filtration step, the flow of the dispersion over the membrane being brought about by means of driven rotating parts; and dispersions of oxidic nanoparticles that are obtainable by the method. | 07-29-2010 |
20100307068 | DISPERSION COMPRISING CERIUM OXIDE AND COLLOIDAL SILICON DIOXIDE - A dispersion comprising particles of cerium oxide and particles of cerium oxide and colloidal silicon dioxide, where —the zeta potential of the silicon dioxide particles is negative and that of the cerium oxide particles is positive or equal to zero, and the zeta potential of the dispersion is negative overall, —the mean diameter of the cerium oxide particles is not more than 200 nm silicon dioxide particles is less than 100 nm, —the proportion, based in each case on the total amount of the dispersion, of cerium oxide particles is from 0.1 to 5% by weight silicon dioxide particles is from 0.01 to 10% by weight and —the pH of the dispersion is from 3.5 to <7.5. | 12-09-2010 |
20100308258 | DISPERSION COMPRISING CERIUM OXIDE AND SHEET SILICATE - A dispersion comprising particles of cerium oxide and sheet silicate, where—the zeta potential of the sheet silicate particles is negative and that of the cerium oxide particles is positive or equal to zero, and the zeta potential of the dispersion is negative overall, —the mean diameter of the cerium oxide particles is not more than 200 nm sheet silicate particles is less than 100 nm, —the proportion, based in each case on the total amount of the dispersion, of cerium oxide particles is from 0.1 to 5% by weight sheet silicate particles is from 0.01 to 10% by weight and—the pH of the dispersion is from 3.5 to <7.5. | 12-09-2010 |
20110114872 | Process For Polishing A Silicon Surface By Means Of A Cerium Oxide-Containing Dispersion - Process for polishing silicon surfaces, in which a dispersion which comprises cerium oxide particles, at least one polymeric, anionic dispersing additive and at least one oxidizing agent and which has a pH of 7 to 10.5 is used, said cerium oxide particles having a positive charge and polymeric, anionic dispersing additive and oxidizing agent being soluble in the liquid phase of the dispersion. | 05-19-2011 |
20110147641 | SURFACE-MODIFIED SUPERPARAMAGNETIC OXIDIC PARTICLES - Surface-modified superparamagnetic oxidic particles, characterized by the following physicochemical characteristics: BET surface area 20 to 75 m2/g; Carbon content 0.5 to 6.0% by weight; Tamped density 150 to 500 g/l; Chlorine content 50 to 1000 ppm; Drying loss 0.1 to 4.0% by weight are prepared by contacting the oxides with the surface modifier either by spraying or vapour deposition and then heat-treating them. The surface-modified oxidic particles can be used as a filler in adhesives. Further fields of application are use for data carriers, as a contrast agent in imaging processes, for biochemical separation and analysis processes, for medical applications, as an abrasive, as a catalyst or as a catalyst support, as a thickener, for thermal insulation, as a dispersing assistant, as a flow assistant and in ferrofluids. | 06-23-2011 |
20120083188 | DISPERSION COMPRISING CERIUM OXIDE AND SILICON DIOXIDE - Aqueous dispersion comprising cerium oxide and silicon dioxide, obtainable by first mixing a cerium oxide starting dispersion and a silicon dioxide starting dispersion while stirring, and then dispersing at a shear rate of 10000 to 30000 s | 04-05-2012 |