881 results about "Tio2 particle" patented technology

The process for preparing tubular titanium oxide particles comprises subjecting a water dispersion sol, which is obtained by dispersing (i) titanium oxide particles and/or (ii) titanium oxide type composite oxide particles comprising titanium oxide and an oxide other than titanium oxide in water, said particles having an average particle diameter of 2 to 100 nm, to hydrothermal treatment in the presence of an alkali metal hydroxide. After the hydrothermal treatment, reduction treatment (including nitriding treatment) may be carried out. The tubular titanium oxide particles obtained in this process are useful as catalysts, catalyst carriers, adsorbents, photocatalysts, decorative materials, optical materials and photoelectric conversion materials. Especially when the particles are used for semiconductor films for photovoltaic cells or photocatalysts, prominently excellent effects are exhibited.

The invention relates to a preparation method of a graphene/titanium dioxide composite photocatalyst, which comprises the following steps: dissolving oxidized graphite in an organic solvent and obtaining oxidized graphene dispersion by ultrasonic processing; adding titanium salt precursor to the oxidized graphene dispersion and stirring evenly; transferring the mixed dispersion into a hydrothermal reaction kettle and reacting at 120-200 DEG C for 4-20 hours; respectively cleaning the product of the reaction by absolute ethyl alcohol and de-ionized water; and drying in vacuum at 40-80 DEG C for 8-24 hours to obtain the graphene/titanium dioxide composite photocatalyst. The invention has the advantages of common and easily obtained raw material, low cost and simple and safe preparation process, and in the obtained product, TiO2 particles can be evenly dispersed on the surface of the graphene, and stronger acting force is formed between the TiO2 particles and the surface of the graphene, thereby avoiding aggregation of the particles and effectively preventing restacking of graphene laminas. The graphene/titanium dioxide composite photocatalyst has good photocatalysis activity due to structural advantages and has potential application value in the fields of environment protection and solar cells.

This invention relates to a method for preparing an activated carbon fiber of Titania particle having nanometer and its usage. The fiber is formed from the activated carbon fiber material loaded with the Titania particles, wherein the mass ratio of the Titania particles is 5~25%. The preparing method uses the sol-gel processing: a) hydrolyzing organic titanium compounds of the TiO2 to the TiO2 collosol, and depositing on the activated carbon fiber, b) drying the colloslo and getting the jel, c) annealing, and transforming to nanometer TiO2 particles compounded in the surface of the fiber, then getting the fiber. The fiber not only maintains the poriness but also enhances the optical catalytic activity of the Titania particle, and can be used for removing the volatile organic contaminant with low concentration, wherein its absorbance can reach to 500mg/g and its optical catalytic dissolution rate can reach to 36%.

Fluid-bed photo-electro catalytic organic water processing device consists of titanium-base oxide positive electrode, negative oxygen electrode, TiO2/C sulfide particle, ultraviolet light source, constant potentiometer DC power source, air distribution board and casing. Not only oxidizing action of positive electrode and reducting action of negative oxygen electrode are used, but also active perssad OH, H2O2, OH- and light, photocatalysis are used, to go deep into bed layer by strong stirring of fluidized particle to increase OH density of the system and to be uniform, TiO2 on surface of fluidized particle produces OH by lighting continuously, and surface of TiO2 particle is renewed continuously.

Surface-modified titanium dioxide particles which have a surface chemically modified with a hydrophilic polymer, wherein a carboxyl group of the hydrophilic polymer and titanium dioxide are bound through an ester bonding; and a method for producing the surface-modified titanium dioxide fine particles, which comprises mixing a dispersion comprising titanium dioxide fine particles having a particle size of 2 to 200 nm and a solution of a water-soluble polymer, heating the resultant mixture to a temperature of 80 to 220° C., to thereby bind both the components through an ester bonding, and removing an unbound water-soluble polymer, to purify the resuultant particles. The surface-modified titanium dioxide fine particles exhibit excellent dispersibility and stability in an aqueous solvent over a wide pH region including a neutral range.

An antibacterial composite TiO2 particle modified by silver phosphate for paint, ceramics, rubber, etc. is prepared from nanometre-class or submicron-class TiO2 particle as kernel through coating SiO2 layer, alumina layer, or SiO2-alumina layer, and coating silver phosphate layer. Its advantages are high purity dispersity and sure antibacterial action.

The invention discloses a preparation method of titanium pigment used in ship paint. The method comprises the following steps that: a. metatitanic acid is calcined, such that a titanium pigment crude product is obtained, the titanium pigment crude product is prepared into TiO2 slurry, and sodium hexametaphosphate is added to the slurry; b. the slurry is heated, a silicon-containing compound is added to the slurry, and the slurry is homogenized; c. the pH value of the TiO2 slurry is regulated to 0.8 to 4; d. after the slurry is slaked, an organic dispersant is added to the slurry, an aluminum-containing compound is added to the slurry, and the mixture is homogenized; e. the pH value of the TiO2 slurry is regulated to 4 to 8; f. the TiO2 slurry is slaked; g. the TiO2 slurry is filtered, such that the resistivity of the filter cake is greater than or equal to 100 [omega]M; and the filter cake is dried and heat treated; h. an organic surface conditioning agent is added to the filter cake, and the filter cake is crushed, such that the finished product is obtained. According to the present invention, nano-sized silicon oxide sol and alumina sol are prepared sequentially. Through physical adsorption and chemical absorption, a compact coating layer is formed on the surface of the TiO2 particles. Then, the coating layer is firmly attached to the surface of the TiO2 particles through chemical deposition. With the coating layer, the product provided by the present invention possesses good dispersibility, weatherability and corrosion resistance. Meanwhile, according to the method provided by the present invention, the raw materials are easy to obtain, the processes are smooth and are easy to control.

A sol solution containing poly(titanic acid) and a planar heterocyclic ligand is provided. Titanium dioxide (TiO₂) particles are formed by aging the sol solution at a temperature below about 140° C. The particles have metallocene-like Ti-complexes comprising the heterocyclic ligand and can be substantially in the anatase phase. The heterocyclic ligands can be triazole, tetrazole, or thiadiazole. The sol solution may be prepared by aging a precursor solution. The precursor solution may contain the heterocyclic ligands and a precursor for poly(titanic acid). The precursor may be titanium alkoxide or titanium chloride. The sol solution may also contain at least one of an organic acid, a base, and a surfactant. The aged sol solution may form a colloidal dispersion of the TiO₂ particles. A photo-catalytic and transparent film may be formed from the TiO₂ particles by depositing a layer of the colloidal dispersion on a support.

Cosmetic composition providing a high coverage of skin while retaining a natural skin appearance comprising iron oxide particles having an average primary particle size of less than or equal to 100 nm, iron-containing titanium dioxide particles having an average primary particle size of at least 105 nm and comprising from 1% to 15% iron by weight of the titanium dioxide, and a cosmetically acceptable carrier and its use as a foundation and/or as a composition to correct skin discoloration surrounding the eye.

Processes for reducing the appearance of ashiness or pastiness on skin by applying thereto a cosmetic composition comprising transparent iron oxide particles, iron-containing titanium dioxide particles, and a cosmetically acceptable carrier. These processes are useful to provide coverage of skin imperfections and/or skin tonal variations and/or skin discoloration surrounding the eyes on different types of skin, while, at the same time, retaining a natural skin appearance.

The invention provides a grading three-dimensional porous graphene/titanium dioxide photocatalyst and preparation method thereof. The photocatalyst is composed by a three-dimensional grapheme framework and nano titanium dioxide particles; the grahene is provided with a macroporous structure; titanium dioxide is mesoporous titanium dioxide; the macropores and the mesopores are communicated; the nano titanium dioxide particles are scattered on a grapheme nano sheet; the surfaces of nano titanium dioxide microspheres are wrapped with graphene nano sheets; the macropores of the graphene are filled with the nano titanium dioxide microspheres. The photocatalyst with a three-dimensional structure can not only prevent the graphene sheet layers from stacking, but also scatter titanium dioxide particles excellently, and is high in specific surface area; besides, samples can be used for photocatalysis degradation of methylene blue, and the methylene blue can be fully degraded in 25 minutes. The preparation method provides a new thought for preparation of the photocatalyst, and has a potential application value in the fields of energy sources and environment.

The titanium dioxide pigment of the present invention comprises titanium dioxide particles, the coating layer containing the aluminum phosphate compound and the coating layer containing the hydrolyzate of the organosilane compound, on the surface of the particles, in which a difference in water content between 100° C. and 300° C., determined by the Karl Fischer method, is not greater than 1500 ppm, and is thus excellent in light fastness, hydrophobicity and dispersibility. In particular, the titanium dioxide pigment of the invention is extremely advantageous as a colorant for plastics, which requires light fastness (resistance to discoloration) lacing resistance and dispersibility, to a high degree.

The invention discloses a preparation method of a super-hydrophobic coating layer on an aluminum surface. The preparation method mainly comprises the following steps: (1) an aluminum piece is polished by an abrasive paper, is ultrasonically cleaned for 10 minutes by acetone and ethanol, is washed by distilled water to remove oil stains on the surface, and is dried in an oven; (2) the aluminum piece is dip in an acid etching agent for etching to obtain the aluminum surface with a micron rough structure; (3) the micron rough aluminum piece is dip in nanometer TiO2 particle solution, and is treated at high temperature to obtain the aluminum surface with a micron-nanometer composite rough structure; and (4) the aluminum surface with the micron-nanometer composite rough structure is treated by fluorine silane with low surface energy to obtain the aluminum surface with super-hydrophobic performance. The prepared super-hydrophobic aluminum piece is excellent in self-cleaning performance, fog resistance and ice covering resistance, and can be applied to field of ice covering prevention.

The first photoelectric cell of the present invention comprises: an insulating base having on its surface an electrode layer (1), the electrode layer (1) having on its surface a metal oxide semiconductor film (2) on which a photosensitizer is adsorbed; an insulating base having on its surface an electrode layer (3), the electrode layer (1) and the electrode layer (3) arranged opposite to each other; and an electrolyte sealed between the metal oxide semiconductor film (2) and the electrode layer (3), wherein at least one of the electrode-having insulating bases is transparent; and the metal oxide semiconductor film (2) comprises anatase titanium oxide particles. This first photoelectric cell includes a semiconductor film comprising anatase titanium oxide particles, having a high proportion of photosensitizer adsorbed, so that the electron mobility in the semiconductor film is high to thereby realize excellent photoelectric transfer efficiency. The second photoelectric cell of the present invention comprises: an insulating base having on its surface an electrode layer (1), the electrode layer (1) having on its surface a metal oxide semiconductor layer (2) on which a photosensitizer is adsorbed; an insulating base having on its surface an electrode layer (3), the electrode layer (1) and the electrode layer (3) arranged opposite to each other; and an electrolyte sealed between the metal oxide semiconductor layer (2) and the electrode layer (3), wherein conductive protrusions (4) jutting from the surface of the electrode layer (1) exist, the metal oxide semiconductor layer (2) formed so as to cover the conductive protrusions (4) and the electrode layer (1), and at least one of the electrode-layer-having insulating bases is transparent. In this second photoelectric cell, conductive protrusions are provided on the electrode surface, so that generated electrons not only can rapidly move toward the electrode but also are free from recombining with the photosensitizer. Moreover, in this photoelectric cell, not only is the adsorption proportion of photosensitizer high but also the moving of generated electrons is smooth. Therefore, the second photoelectric cell exhibits excellent photoelectric transfer efficiency.

An electrophotographic photosensitive member including a support, a first intermediate layer formed on the support, a second intermediate layer formed directly on the first intermediate layer, a charge generating layer formed directly on the second intermediate layer, and a hole transporting layer formed on the charge generating layer, wherein the first intermediate layer contains a binder resin and a titanium oxide particle, and the second intermediate layer contains a polymerized product of a composition including an electron transporting substance having a polymerizable functional group and a crosslinking agent.

A particulate titanium oxide is obtained which has a large specific surface area and a high crystallinity with few internal defects, and thus a high photocatalytic activity as a photocatalyst is expected. Particulate titanium oxide in which the particles are box-shaped polyhedra is used as the photocatalyst. The particles are each a box-shaped polyhedron composed of one or more titanium oxide single crystalline polyhedron. When this single crystalline polyhedron has a flatness ratio of 0.33 to 3.0, the crystallinity is even higher. The particulate titanium oxide typically has a rutile transition ratio R(700-24) of not more than 7.5% and a rutile transition ratio R(500-24) of not more than 2.0%. Titanium oxide particles of these shapes are manufactured by feeding titanium tetrachloride vapor and oxygen into a reaction tube made of silica glass and applying heat from outside the tube to effect thermal oxidation.