47 results about "Titania nanoparticles" patented technology

The present invention relates to the formation of surface treated zinc oxide and titania particles, and in particular zinc oxide and titania nanoparticles, with a siloxane star-graft copolymer coating, comprising a looped and/or linear polymeric structure on a star-graft copolymer coating, on a particle surface to control the interfacial surface interactions between the particle and the oil phase of the cosmetic skin formulation.

The present invention provides a one-step and room-temperature process for depositing nanoparticles or nanocomposite (nanoparticle-assembled) films of crystalline titanium dioxide (TiO₂) onto a substrate surface using ultrafast pulsed laser ablation of Titania or metal titanium target. The system includes a pulsed laser with a pulse duration ranging from a few femtoseconds to a few tens of picoseconds, an optical setup for processing the laser beam such that the beam is focused onto the target surface with an appropriate average energy density and an appropriate energy density distribution, and a vacuum chamber in which the target and the substrate are installed and background gases and their pressures are appropriately adjusted.

A self-cleaning membrane is formed of microfibers and/or nanofibers that contain functionalized nanoparticles. In one embodiment, the nanoparticles contain photo-catalytic particles, that when exposed to ultraviolet light, cause decomposition of organic molecules. The decomposed molecules may be easily flushed from the membrane. In one embodiment, the particles are titania nanoparticles, some of which are disposed on or near the outside of the fibers.

The invention discloses a method for preparing rutile titania nanoparticles, which comprises a liquid phase method and particularly comprises the following steps: 1, mixing polyvinylpyrrolidone and water to obtain polyvinylpyrrolidone solution with the concentration between 0.01 and 0.2M, and putting a titanium plate into the polyvinylpyrrolidone solution with stirring; 2, radiating the titanium plate for 20 to 40min with laser of which the wavelength is 1,064nm, the power is between 70 and 130mJ/pulse, the frequency is between 5 and 15Hz and the pulse width is between 5 and 15ns to obtain titania colloid; and 3, centrifuging, washing and drying the titania colloid to prepare the spherical rutile titania nanoparticles of which the particle size is between 5 and 80n, wherein the weight-average molecular weight of the polyvinylpyrrolidone is between 2,000 and 40,000; the purity of the titanium plate is more than or equal to 99.9 percent; a laser emitting the laser with the wavelength of 1,064nm is a Nd:YAG solid laser; and the spot diameter of the laser is between 1 and 2mm. The method can be widely used for industrially producing the rutile titania nanoparticles on a large scale.

A method is disclosed of producing stable nanosized colloidal suspensions of particles with limited crystallinity loss, products thereof, use of the products and an apparatus for the method. In particular the present invention relates to a wet milling method with small beads wherein the size of the final particles in suspension are stabilized in the nanorange (D50<75 nm) and at the same time the particles substantially maintain the crystallinity.

Disclosed herein are compositions of metal oxide nanoparticles having regular polyhedral nanocavities, where the metal oxide can be titania, and where the nanoparticles be nanorods. Also disclosed are titania nanoparticles with nanocavities that are doped with dopants. Methods of making metal oxide nanoparticles with nanocavities are also disclosed. Also disclosed are ultraviolet-blocking compositions including metal oxide nanoparticles with nanocavities, as well as methods of enhancing ultraviolet absorbance efficiency of an ultraviolet blocking composition. Additional uses of metal oxide nanoparticles with nanocavities include solar energy conversion systems and lithium-ion batteries.

The invention provides a method for preparing a photocatalytic film with a broad spectral response, the preparation method comprising the following steps: preparing a polymer matrix solution, preparing a titanium dioxide photocatalyst with a broad spectral response by a supercritical hydrothermal method, and preparing a broad spectral response by electrospinning Responsive photocatalytic film. The photocatalytic membrane prepared by the present invention has the advantages of high porosity and high specific area, and the specific surface area reaches more than 300m2/g, and also has a special structure with coexistence of micropores and mesopores, so that titanium dioxide nanomaterial particles can disperse the load more evenly On a polymer matrix non-woven fabric. The photocatalytic membrane prepared by the present invention has both filtering and purification functions, can filter nano-scale particles, can not only adsorb a large amount of pollutants such as formaldehyde and VOC, but also efficiently catalyze and degrade pollutants such as formaldehyde and VOC into CO2 and water, to achieve the dual effect of catalytic degradation and filtration.

The invention discloses a self-cleaning corrosion-resistant aluminum profile and relates to the technical field of aluminum profiles. The self-cleaning corrosion-resistant aluminum profile comprises an aluminum profile matrix and an epoxy resin coating coating the surface of the aluminum profile matrix, wherein the epoxy resin coating is prepared by mixing a component A and a component B accordingto a weight ratio of 3-5 to 1; the component A comprises the following raw materials in parts by weight: 40-50 parts of a bisphenol A epoxy resin emulsion, 5-10 parts of modified titania nanoparticles, 0.5-2 parts of fumed silica, 5-10 parts of diatomite, 2-5 parts of graphene oxide, 3-7 parts of texanol, 2-5 parts of polyethyleneglycol diglycidyl ether, 0.5-2 parts of a dispersing agent, 0.5-2 parts of a flatting agent, 12-15 parts of water, 2-5 parts of a coupling agent and 0.2-1 part of nonylphenol polyoxyethylene ether; the component B is a waterborne epoxy amine curing agent. The coatingprepared by the invention is excellent in pollution resistance, bactericidal activity, corrosion resistance and wear resistance and is excellent in bonding strength with an aluminum alloy base material, a long-term protection effect is achieved, the service life of the aluminum alloy is prolonged, and the application range is widened.

A copolymer comprises the reaction product of (a) (meth)acrylate functionalized nanoparticles, (b) vinyl monomer, and (c) mercapto-functional silicone. The (meth)acrylate functionalize nanoparticles are selected from the group consisting of silica nanoparticles, zirconia nanoparticles, titania nanoparticles, and combinations thereof.

The present invention relates to the formation of surface treated zinc oxide and titania particles, and in particular zinc oxide and titania nanoparticle s, with a siloxane star-graft copolymer coating, comprising a looped and/or linear polymeric structure on a star-graft copolymer coating, on a particle surface to control the interfacial surface interactions between the particle and the oil phase of the cosmetic skin formulation.

Disclosed are fine particles having a multiple structure, a polymer film for smart glass, and a method of manufacturing the same. More particularly, disclosed are fine particles having a multiple structure, which include a reaction portion containing iron oxide nanoparticles, carbon black and/or carbon nanotubes, and at least one non-reaction portion containing silica and/or titania nanoparticles, and which rotate by means of an electric field or a magnetic field, a polymer film for smart glass including the fine particles to control light transmissivity, and a method of manufacturing the same.

A method for forming non-agglomerated brookite TiO₂ nanoparticles without the use of expensive organic surfactants or high temperature processing. Embodiments of this invention use titanium isopropoxide as the titanium precursor and isopropanol as both the solvent and ligand for ligand-stabilized brookite-phase titania. Isopropanol molecules serve as the ligands interacting with the titania surfaces that stabilize the titania nanoparticles. The isopropanol ligands can be exchanged with other alcohols and other ligands during or after the nanoparticle formation reaction.

It is disclosed that a photo-electrode of a dye-sensitized solar cell comprising faceted anatase-type titania nanoparticles which adequate for fabricating a photo-electrode of a dye-sensitized solar cell which is efficient and longlasting and a fabrication method thereof. The titania nanoparticles can provide high photoelectric conversion efficiency of the solar cell with help of fast electron mobility due to its high crystallinity and can reduce process time required for adsorbing the dye molecules on the surface of the titania nanoparticles.

By modifying surface characteristics of the titania nanoparticles, it is allowed for dye molecules to be easily adsorbed on the surface of the titania nanoparticles and the life span of the dye molecules adsorbed on it is expanded with help of reduced photo-degradation rate of them at service conditions.

The invention discloses an olefin deoxygenation agent, its preparation method, and olefin deoxygenation method using the same. The preparation method includes (by weight parts) (1) mixing manganese source (as Mn3O4) 100 and titania nanoparticle 58-100 to obtain a mixture; (2) calcining; (3) kneading the calcined mixture and a silver compound (as Ag2O) aqueous solution 8-35, and forming; (4) aging and drying; and (5) calcining. The second calcining temperature is lower than the first calcining temperature. The inventive olefin deoxygenation agent has high room-temperature deoxygenation capacity up to 27.1 mL/g, deoxygenation depth lower than 0.01 ppm, low reduction temperature, and wide applicability in industrial production.

A leaf inspired biomimetic light trapping scheme for ultrathin flexible graphene silicon Schottky junction solar cell. An all-dielectric approach comprising of lossless silica and titania nanoparticles is used for mimicking the two essential light trapping mechanisms of a leaf: (1) focusing and waveguiding and (2) scattering. The light trapping scheme uses two optically tuned layers and does not require any nano-structuring of the active silicon substrate, thereby ensuring that the optical gain is not offset due to recombination losses.

The invention discloses an olefin deoxygenation agent, its preparation method, and olefin deoxygenation method using the same. The preparation method includes (by weight parts) (1) mixing manganese source (as Mn3O4) 100 and titania nanoparticle 58-100 to obtain a mixture; (2) kneading the mixture and a silver compound (as Ag2O) aqueous solution 8-35, and forming; (3) aging and drying; and (4) calcining. The inventive olefin deoxygenation agent has high room-temperature deoxygenation capacity up to 25.5 mL/g, deoxygenation depth smaller than 0.01 ppm, low reduction temperature, and wide applicability in industrial production. The agent realizes high-efficiency deoxygenation at room temperature.

The invention discloses an olefin deoxygenation agent, its preparation method, and olefin deoxygenation method using the same. The preparation method includes (by weight parts) (1) mixing manganese source (as Mn3O4) 100 and modified titania nanoparticle 58-100 to obtain a mixture; (2) calcining; (3) kneading the calcined mixture and a silver compound (as Ag2O) aqueous solution 8-35, and forming; (4) aging and drying; and (5) calcining. The second calcining temperature is lower than the first calcining temperature. The inventive olefin deoxygenation agent has high room-temperature deoxygenation capacity up to 31 mL/g, deoxygenation depth lower than 0.01 ppm, low reduction temperature, and wide applicability in industrial production.