Abstract: Provided is a method of producing a titanium oxide in which titanium tetrachloride is hydrolyzed using a liquid-phase method. This method includes a step of adding an aqueous titanium tetrachloride solution to warm water having a higher temperature than the aqueous titanium rachloride solution, in which in the step, the temperature of the warm water is 30° C. to 95° C. and the aqueous titanium tetrachloride solution is added to the warm water such that an increase rate of titanium atomic concentration in the warm water is 0.25 mmol/L/min to 5.0 mmol/L/min, and a titanium atomic concentration in the warm water after the step is 280 mmol/L or lower.

Abstract: Provided is a method of producing a titanium oxide in which titanium tetrachloride is hydrolyzed using a liquid-phase method. This method includes a step of adding an aqueous titanium tetrachloride solution to warm water having a higher temperature than the aqueous titanium rachloride solution, in which in the step, the temperature of the warm water is 30° C. to 95° C. and the aqueous titanium tetrachloride solution is added to the warm water such that an increase rate of titanium atomic concentration in the warm water is 0.25 mmol/L/min to 5.0 mmol/L/min, and a titanium atomic concentration in the warm water after the step is 280 mmol/L or lower.

Abstract: A liquid phase method for producing titanium oxide sol by hydrolysis of titanium tetrachloride, which includes mixing an aqueous titanium tetrachloride solution into water at a temperature of 80° C. or higher within 60 seconds while maintaining the mixed solution at the temperature and cooling it to less than 60° C. within 15 minutes after the mixing is completed. Also disclosed is a titanium oxide sol obtained by the method, having an average primal particle diameter (DBET) of 3 to 8 nm, a cumulative 50% volume particle diameter (D50DLS) and DBET have the relationship represented by D50DLS=k×DBET where k is 1 or more and less than 5, and an anatase content of 70% or more; a particulate titanium oxide obtained by drying the titanium oxide sol; and a production method and application thereof to solar cells, lithium ion battery electrodes and dielectric materials.

Abstract: Titanium dioxide having a ratio Dtop/D50 of 1 to 3, between the maximum particle diameter Dtop and the average particle diameter D50, as determined based on observing the primary particles by a field emission-type scanning electron microscope. A production process of the titanium dioxide comprises performing a vapor phase process of reacting a titanium tetrachloride-containing gas with an oxidative gas to produce titanium dioxide, wherein when the titanium tetrachloride-containing gas and the oxidative gas are reacted by introducing each gas into a reaction tube, the temperature in the reaction tube is from 1,050 to less than 1,300° C.

Abstract: A liquid phase method for producing titanium oxide sol by hydrolysis of titanium tetrachloride, which includes mixing an aqueous titanium tetrachloride solution into water at a temperature of 80° C. or higher within 60 seconds while maintaining the mixed solution at the temperature and cooling it to less than 60° C. within 15 minutes after the mixing is completed. Also disclosed is a titanium oxide sol obtained by the method, having an average primal particle diameter (DBET) of 3 to 8 nm, a cumulative 50% volume particle diameter (D50DLS) and DBET have the relationship represented by D50DLS=k×DBET where k is 1 or more and less than 5, and an anatase content of 70% or more; a particulate titanium oxide obtained by drying the titanium oxide sol; and a production method and application thereof to solar cells, lithium ion battery electrodes and dielectric materials.

Abstract: A process for producing a fine particulate titanium dioxide, comprising charging a fine particulate titanium dioxide powder in a resin bag, spraying water droplets having a liquid droplet diameter of 5 to 500 ?m to the powder in the bag, and closing the bag for storing the powder in the bag.

Abstract: A process for producing a fine particulate titanium dioxide, comprising charging a fine particulate titanium dioxide powder in a resin bag, spraying water droplets having a liquid droplet diameter of 5 to 500 ?m to the powder in the bag, and closing the bag for storing the powder in the bag.

Abstract: A dye sensitized solar cell comprising, as the dye electrode, a titanium oxide structure having an optical band gap (hereinafter referred to as “BG”) of 2.7 to 3.1 eV as calculated from absorbance measured by an integrating sphere-type spectrophotometer, or a metal oxide structure obtained by dry-mixing a plurality of metal oxide powder particles differing in the particle size or a metal oxide dispersion thereof, wherein assuming that the BG of raw material metal oxide is BG0 and the BG of metal oxide after the dry mixing is BG1, the (BG0-BG1) is from 0.01 to 0.45 eV, and a production method thereof are provided.

Abstract: An anatase-type ultrafine particulate titanium oxide produced through a vapor-phase process, which has low chlorine content and exhibits excellent dispersibility as compared with conventional titanium oxide having a BET specific surface area comparable to that of the ultrafine particulate titanium oxide. When the ultrafine particulate titanium oxide is subjected to dechlorination, the titanium oxide satisfies the relation between BET surface area (B) and chlorine content (C) represented by the formula C?650e0.02B. The ultrafine particulate titanium oxide has a D90 of 2.5 (m or less as measured by means of laser diffraction particle size analysis. The present invention also provides a process for producing the ultrafine particulate titanium oxide.

Abstract: A metal oxide dispersion comprising metal oxide particles with a necking structure, and a solvent, wherein the liquid droplet contact angle of the metal oxide dispersion to an ITO film (Indium-Tin Oxide type film) formed is from 0 to 60°. A metal oxide dispersion for the production of a dye-sensitized solar cell electrode, comprising Metal Oxide Particle Group F having a necking structure formed by m connected particles, Metal Oxide Particle Group G having only 0.2 m or less connected particles, and a solvent, and being formable into a film at 200° C. or less. A metal oxide electrode comprising an electrically conducting substrate having thereon a metal oxide layer comprising metal oxide particles bound by a binder, wherein the binder content is from 0.005 to 5 mass % based on the metal oxide film and the metal oxide layer has a pencil scratch strength of H or more according to JIS5600.

Abstract: The present invention provides particulate titanium oxide and a production process thereof. The particulate titanium oxide comprises mixed crystal titanium oxide containing rutile crystal produced by a vapor phase process, wherein the titanium oxide has a property represented by the following general formula R?1300×B?0.95 wherein R represents a rutile content (%) and B represents a BET specific surface area (m2/g). The titanium oxide is particulate high-rutile-content titanium oxide with very low aggregation and having a high dispersibility.

Abstract: A high-purity ultrafine particulate titanium dioxide with a reduced fluctuation of the adsorbed water content which is a large mass fluctuation factor in a fine particulate powder body, is provided. The fine particulate titanium dioxide has a BET specific surface area of 10 to 200 m2/g, wherein when a powder of the titanium dioxide in an amount of 2 to 5 g is spread in a 10 cm-diameter glass-made Petri dish to a uniform thickness and left standing in an environment at 20° C. and a relative humidity of 80% for 5 hours, the rate of change of mass based on the mass before standing is from ?5 mass % to 5 mass %.

Abstract: Titanium dioxide having a ratio Dtop/D50 of 1 to 3, between the maximum particle diameter Dtop and the average particle diameter D50, as determined based on observing the primary particles by a field emission-type scanning electron microscope. A production process of the titanium dioxide comprises performing a vapor phase process of reacting a titanium tetrachloride-containing gas with an oxidative gas to produce titanium dioxide, wherein when the titanium tetrachloride-containing gas and the oxidative gas are reacted by introducing each gas into a reaction tube, the temperature in the reaction tube is from 1,050 to less than 1,300° C.

Abstract: A pigment comprises a titanium oxide having a BET specific surface area of from about 3 m2/g to about 200 m2/g, and a D90 diameter corresponding to 90% of a particle size cumulative distribution on a weight basis of about 2.2 ?m or less. Also disclosed is a photocatalyst composition, a cosmetic, a cloth, an ultraviolet ray-shielding material and a silicone rubber, each containing a titanium oxide.

Abstract: A dye sensitized solar cell comprising, as the dye electrode, a titanium oxide structure having an optical band gap (hereinafter referred to as “BG”) of 2.7 to 3.1 eV as calculated from absorbance measured by an integrating sphere-type sptetrophotometer, or a metal oxide structure obtained by dry-mixing a plurality of metal oxide powder particles differing in the particle size or a metal oxide dispersion thereof, wherein assuming that the BG of raw material metal oxide is BGO and the BG of metal oxide after the dry mixing is BG1, the (BG0-BG1) is from 0.01 to 0.45 eV, and a production method thereof are provided.

Abstract: A pigment comprises a titanium oxide having a BET specific surface area of from about 3 m2/g to about 200 m2/g, and a D90 diameter corresponding to 90% of a particle size cumulative distribution on a weight basis of about 2.2 ?m or less. Also disclosed is a photocatalyst composition, a cosmetic, a cloth, an ultraviolet ray-shielding material and a silicone rubber, each containing a titanium oxide.

Abstract: An anatase-type ultrafine particulate titanium oxide process, which has low chlorine content compared with conventional titanium oxide having a BET specific surface area comparable to that of the ultrafine particulate titanium oxide. When the ultrafine particulate titanium oxide is subjected to dechlorination, the titanium oxide satisfies the relation between BET surface area (B) and chlorine content (C) represented by the aforementioned formula (2). The ultrafine particulate titanium oxide has a D90 of 2.5 (m or less as measured by means of laser diffraction particle size analysis. The present invention also provides a process for producing the ultrafine particulate titanium oxide.

Abstract: Particulates, particularly ultrafine particulates of titanium oxide having a BET specific surface area of from about 3 m2/g to about 200 m2/g, preferably from about 5 m2/g to about 200 m2/g, and more preferably from about 10 m2/g to about 200 m2/g are obtained using a vapor phase process of producing titanium oxide by oxidizing titanium tetrachloride with an oxidizing gas at a high temperature, wherein a titanium tetrachloride-containing gas and an oxidizing gas are reacted after preheating each gas at about 500° C. or more. The particulates, particularly ultrafine particulates of titanium oxide have less aggregation and have highly excellent dispersibility.

Abstract: The present invention provides particulate titanium oxide and a production process thereof. The particulate titanium oxide comprises mixed crystal titanium oxide containing rutile crystal produced by a vapor phase process, wherein the titanium oxide has a property represented by the following general formula R≧1300×B−0.95 (In the formula, R represents a rutile content (%) and B represents a BET specific surface area (m2/g)).

Abstract: Particulates, particularly ultrafine particulates of titanium oxide having a BET specific surface area of from about 3 m2/g to about 200 m2/g, preferably from about 5 m2/g to about 200 m2/g, and more preferably from about 10 m2/g to about 200 m2/g are obtained using a vapor phase process of producing titanium oxide by oxidizing titanium tetrachloride with an oxidizing gas at a high temperature, wherein a titanium tetrachloride-containing gas and an oxidizing gas are reacted after preheating each gas at about 500° C. or more. The particulates, particularly ultrafine particulates of titanium oxide have less aggregation and have highly excellent dispersibility.