467 results about "Titanium dioxide nanoparticles" patented technology

Nanoparticulate titanium dioxide coating produced by educing flocculates of titanium dioxide nanoparticles from a titanyl sulfate solution and dispersing the nanoparticles in a polar sol-forming medium to make a sol suitable as a coating usable to impart photocatalytic activity, U.V. screening properties, and fire retardency to particles and to surfaces. The photocatalytic material and activity is preferably localized in dispersed concentrated nanoparticles, spots or islands both to save costs and leverage anti-microbial effects.

Nanoparticulate titanium dioxide coating produced by educing flocculates of titanium dioxide nanoparticles from a titanyl sulfate solution and dispersing the nanoparticles in a polar sol-forming medium to make a sol suitable as a coating usable to impart photocatalytic activity, U.V. screening properties, and fire retardency to particles and to surfaces. The photocatalytic material and activity is preferably localized in dispersed concentrated nanoparticles, spots or islands both to save costs and leverage anti-microbial effects.

A photoelectrochemical assay apparatus for determining chemical oxygen demand (COD) of a water sample which consists of a) a measuring cell for holding a sample to be analysed b) a titanium dioxide nanoparticle photoelectric working electrode and a counter electrode disposed in said cell, c) a UV light source adapted to illuminate the photoelectric working electrode d) control means to control the illumination of the working electrode e) potential measuring means to measure the electrical potential at the working and counter electrodes f) analysis means to derive a measure of oxygen demand from the measurements made by the potential measuring means. The method of determining chemical oxygen demand of a water sample, comprises the steps of a) applying a constant potential bias to a photoelectrochemical cell, containing a supporting electrolyte solution; b) illuminating the working electrode with a UV light source and recording the background photocurrent produced at the working electrode from the supporting electrolyte solution; c) adding a water sample, to be analysed, to the photoelectrochemical cell; d) illuminating the working electrode with a UV light source and recording the total photocurrent produced; e) determining the chemical oxygen demand of the water sample according to the type of degradation conditions employed. The determination may be under exhaustive degradation conditions, in which all organics present in the water sample are oxidised or under non-exhaustive degradation conditions, in which the organics present in the water sample are partially oxidised.

Solar-reflective roofing granules having improved solar heat-resistance are formed by coating colored mineral particles with a coating composition including titanium dioxide nanoparticles.

The disclosure provides a sunscreen formulation comprising a peptide-based metal oxide sunscreen agent, such as titanium dioxide nanoparticles, and a fluid vehicle.

The present invention relates to a liquid composition for promoting plant growth, which contains titanium dioxide nanoparticles. The composition contains, as a main component, an aqueous solution containing titanium dioxide colloids. The titanium dioxide nanoparticles have such a particle size that they can be readily absorbed to plants. A pH of the aqueous solution is adjusted in order to prevent rapid precipitation of the titanium dioxide nanoparticles in the aqueous solution, before the aqueous solution is diluted with water such that titanium dioxide has a desired concentration. Also, the composition contains adjuvants necessary for plant growth and a surfactant for dispersion. The composition allows crop yield to be increased by increasing the photosynthetic efficiency of plants, and permits increasing the bactericidal activity of plants against plant pathogens. Furthermore, the composition permits improving a problem of environmental contamination caused by the excessive use of biochemical fertilizers, and also contributes to an increase in farmer income.

The invention relates to a method for preparing a catalyst for flue gas denitrification. The method comprises the following steps: step 1: preparing a powder mixture of titanium dioxide nanoparticles, binders and auxiliaries; step 2: preparing an oxalic acid solution of tungsten and vanadium; step 3: mixing the powder mixture produced in the step 1 and the solution produced in the step 2 to obtain a catalyst slurry; and step 4: uniformly spreading the catalyst slurry produced in the step 3 on a surface-treated stainless steel net, rolling and molding, drying and calcining to obtain the final catalyst. Furthermore, the invention also relates to a catalyst for flue gas denitrification, which is prepared by the method. The catalyst with high mechanical strength and excellent catalytic activity overcomes the problem that the prior catalyst for flue gas denitrification has poor mechanical strength after molding.

The present invention relates to a process for the production of titanium-containing oxide particles having an average primary particle size of 25 nm or less, which comprises the reaction of a hydrolysable halide-containing titanium compound with water in a reaction mixture comprising a polyol, and the particles obtainable thereby. The claimed method is suitable for an industrial upscale and allows the formation of concentrated stable and transparent dispersions in water without the aid of dispersing agents such as surfactants.

Titanium dioxide nanoparticles are prepared in liquid phase at a low temperature. The titanium dioxide nanoparticles can be added into polyester to prepare polyester grains having a photocatalytic antibacterial property. Furthermore, a textile can be dipped into a solution containing the titanium dioxide nanoparticles to obtain a photocatalytic antibacterial textile.

The present invention relates to an ecological shell powder inorganic nanometer composite coating material and a preparation method thereof. The ecological shell powder inorganic nanometer composite coating material comprises, by mass, 70-90% of shell powder and 10-30% of a composite glue adhesive, wherein the shell powder contains 1-3% by mass of titanium dioxide nanoparticles and 1-3% by mass of tourmaline powder, and the composite glue adhesive contains 80-90% by mass of water, 3-10% by mass of polyvinyl alcohol, and 0.5-3% by mass of cellulose. According to the present invention, natural shell powder is adopted as a main material, any toxic and hazardous substances are not added, and the ecological shell powder inorganic nanometer composite coating material has functions of indoor toxic gas absorption and decomposition, and has the following characteristics that: construction is simple, shedding due to scrubbing can not be generated, negative oxygen ions can be released for a long time so as to carry out a purification and sterilization treatment on indoor air.

The invention relates to an improved method for producing silica aerogel in pure and flexible sheet form having effective suppression of radiative heat transport at high temperatures and increased thermal insulation property. The suppression of radiative heat transport was achieved by in-situ production of titanium dioxide nanoparticles in very minor concentrations during gelation of silica precursor, with nanoporous surface area more than 300 m<2> / g and acts as an infra red reflecting agent. When aerogel is subjected to heat during hot object insulation, it automatically turns into infra redreflecting material. Said silica aerogel can be incorporated into the inorganic fibre mat matrix individually or into two or more layers with organic sponge sheet placed in between and stitched together to form a sandwich sheet to form highly insulating flexible sheet.

Provided are: novel rutile titanium dioxide nanoparticles each having a high photocatalytic activity; a photocatalyst including the rutile titanium dioxide nanoparticles; and a method for oxidizing an organic compound using the photocatalyst. The rutile titanium dioxide nanoparticles each have an exposed crystal face (001). The rutile titanium oxide nanoparticles may be produced by subjecting a titanium compound to a hydrothermal treatment in an aqueous medium in the presence of a hydrophilic polymer. A polyvinylpyrrolidone, for example, is used as the hydrophilic polymer. An organic compound having an oxidizable moiety can be oxidized with molecular oxygen or a peroxide under photoirradiation in the presence of the photocatalyst including the rutile titanium oxide nanoparticles.

The invention is directed to a method for reducing the chemical activity and photo activity of titanium dioxide nanoparticles comprising adding a densifying agent, such as citric acid, to an aqueous slurry of the titanium dioxide nanoparticles; treating the aqueous slurry with a source of alumina, such as a solution of sodium aluminate, to form alumina-treated titanium dioxide nanoparticles. In one embodiment the particles are treated with a source of silica, such as a solution of sodium silicate. The nanoparticles of this invention can also be treated with a source of silica and a source of alumina. The treated nanoparticles can be silanized. The titanium dioxide nanoparticles described herein are useful in cosmetic, coating and thermoplastic compositions.

The invention relates to an improved method for producing silica aerogel in pure and flexible sheet form having effective suppression of radiative heat transport at high temperatures and increased thermal insulation property. The suppression of radiative heat transport was achieved by in-situ production of titanium dioxide nanoparticles in very minor concentrations during gelation of silica precursor, with nanoporous surface area more than 300 m2 / g and acts as an infra red reflecting agent. When aerogel is subjected to heat during hot object insulation, it automatically turn into infra red reflecting material. Said silica aerogel can be incorporated into the inorganic fibre mat matrix individually or into two or more layers with organic sponge sheet placed in between and stitched together to form a sandwich sheet to form highly insulating flexible sheet.

The invention relates to a preparation method of lamellar stacking titanium dioxide nanoparticles. The preparation method comprises the steps of taking Ti3AlC2 as a material, corroding the Ti3AlC2 by adopting an acid solution, removing an Al atomic layer, and generating a two-dimensional material MXene, then taking the two-dimensional material MXene as a precursor, performing a hydrothermal reaction and an oxidizing reaction in sequence to obtain the lamellar stacking titanium dioxide nanoparticles. Compared with the prior art, the preparation method provided by the invention is simple in processing steps, the novel two-dimensional material is taken as a template, and the lamellar stacking titanium dioxide nanoparticles are synthesized by a two-step method of the hydrothermal reaction and the oxidizing reaction; the reaction condition is mild, the process stability is good, raw materials are easily obtained, the cost is low, and the preparation method of the lamellar stacking titanium dioxide nanoparticles is conducive to realizing the expanded production, and has a very good application prospect.

The invention discloses a method for preparing a titanium dioxide nanoparticle composite silver plating on the surface of a polyester fabric. The method comprises the following steps: firstly preprocessing the polyester fabric; and secondly preparing the titanium dioxide nanoparticle composite silver plating on the surface of the polyester fabric. The method has the following beneficial effects: based on the traditional chemical silver plating process, aiming at the defect of high possibility of agglomeration of the titanium dioxide nanoparticles, a dispersing agent is used for carrying out ultrasonic dispersion on the titanium dioxide nanoparticles and then the titanium dioxide nanoparticles are added to the chemical silver plating solution to carry out titanium dioxide nanoparticle composite chemical silver plating on the polyester fabric under the condition of ultrasonic waves, thus not only improving the wear resistance of the chemical silver plated polyester fabric but also endowing the chemical silver plated fabric with photocatalytic activity.

The invention discloses a preparation method of copper porphyrin functionalized metal organic framework / titania composite heterojunction material. Titanium dioxide nanoparticles are ultrasonically dispersed in DMF (dimethyl formamide); ZrCl4, terephthalic acid, CuTCPP and benzoic acid are added in the solution sequentially; stirring is performed at room temperature to arrive at full mixing; the mixed liquid is subjected to hydrothermal reaction at about 130 DEG C for 10-12 h; centrifuging is performed, and the product is collected and is washed with DMF and acetone; drying is performed to obtain the target product CTU / TiO2. The test results show that CTU / TiO2 has good photocatalytic circulation stability and excellent photocatalytic activity. Compared with pure TiO2 or CTU, the material herein with CTU / TiO2 show significantly enhanced Co-reducing photocatalytic activity. In addition, the CTU / TiO2 is has highly stable recycling in case of photocatalytic reducing of CO2.

The invention belongs to the field of loading of a titanium dioxide photocatalyst, and particularly relates to a preparation method of a polymer / titanium dioxide hybrid membrane with photocatalytic activity, a product prepared with the method and an application thereof. The method disclosed by the invention comprises the following steps of: preparing a base membrane of the polymer / titanium dioxide hybrid membrane; and chemically loading titanium dioxide nanoparticles onto a polymer substrate with a thermal treatment method. Due to the adoption of the preparation method of the polymer / titanium dioxide hybrid membrane with photocatalytic activity provided by the invention, titanium dioxide nanoparticles can be grafted onto a polymer molecular chain. Compared with the prior art, the method has the advantages that: chemical loading of the titanium dioxide nanoparticles in the polymer membrane is realized, the problem of loss of the titanium dioxide nanoparticles in a long-term use process which is difficult to solve in the conventional loading method is solved, high photocatalytic activity in the long-term use process is ensured, a process is simple, and reaction conditions are mild.

The invention relates to a coating, which comprises the following components: surface-modified titanium dioxide and silicon dioxide core-shell nanocomposite particles and a film forming component, wherein a weight ratio of the surface-modified titanium dioxide and silicon dioxide core-shell nanocomposite particles to the film forming component is 1:(9-99); the surface-modified titanium dioxide and silicon dioxide core-shell nanocomposite particles consist of titanium dioxide and silicon dioxide core-shell nanocomposite particles serving as a matrix and a dispersing agent coated thereon, wherein the content of the dispersing agent is 0.1 to 1.5 percent based on the weight of the titanium dioxide and silicon dioxide core-shell nanocomposite particles; and the titanium dioxide and silicon dioxide core-shell nanocomposite particles consist of titanium dioxide nanoparticles serving as cores and silicon dioxide serving as shells, wherein a molar ratio of the titanium dioxide and the silicon dioxide is 1:(1-8), and the titanium dioxide and silicon dioxide core-shell nanocomposite particles have the grain size of 10-60nm. The invention also relates to a method for preparing the coating.

The invention pertains to the application field of nano material and photocatalysis technology, in particular to a method for forming a serials of metal titanium dioxide nanoparticle film with functions of sterilization, anti-mildew, deodorant, degradation of organic pollutants, decomposition of harmful gases and good hydrophilic property. The method comprises: hydro-thermal synthesis method is adopted, which is of high crystallinity; the crystalline phases make up of the metal titanium dioxide nanoparticles which are then dispersed to form sol; thereby, the nanoparticles are solidified to form a layer of film on glass surface. The film has good performances of degradation organics, hydrophile and self-cleaning.

The invention discloses a polymer film with antifouling property. Silicon dioxide nanoparticles or titanium dioxide nanoparticles with amphoteric ionized surfaces are evenly dispersed in the polymer film, wherein the surfaces of the nanoparticles are coated with carboxyl anion-ammonium cation zwitter-ion pairs; the content of the silicon dioxide nanoparticles or the titanium dioxide nanoparticles in the polymer film is 0.3-10wt%; the surface contact angle of the polymer film is reduced to below 50%; the secondary water flux recovery rate in an antifouling separation test reaches over 95%; and the antifouling property is obviously improved.

The invention provides a heavy metal ion adsorption carrier and a preparation method thereof. The heavy metal ion adsorption carrier is characterized by consisting of an inorganic nano-porous titanium dioxide fiber membrane. The preparation method is characterized by comprising the following specific steps of: dissolving a hydrophobic polymer in a solvent, adding titanium dioxide nanoparticles or a soluble titanium salt and stirring to form uniform solution; performing electrostatic spinning on the solution at room temperature and directly depositing fibers prepared by the electrostatic spinning on a receiving material to obtain the fiber membrane; and performing hot pressing on the fiber membrane for 20 to 60 minutes at the temperature of between 90 and 120 DEG C under the pressure of between 1 and 10Mpa, and then calcining at the temperature of between 400 and 500 DEG C to remove organic components from the fibers so as to obtain the inorganic nano-porous titanium dioxide fiber membrane serving as the heavy metal ion adsorption carrier. The heavy metal ion adsorption carrier has the advantage of good adsorption effect on heavy metal ions.

The invention discloses hyaluronic acid and polydopamine-modified drug-loaded mesoporous titanium dioxide nanoparticles. On the one hand, the nanoparticles can be aggregated at tumor sites through active targeting of hyaluronic acid, the selectivity of the preparation is increased, and thus the toxic and side effects of the preparation are reduced. On the other hand, mesoporous titanium dioxide can generate singlet oxygen under the ultrasonic condition, meanwhile, polydopamine can convert light energy into heat energy under the irradiation of near-infrared laser, and the combined application of sonodynamic therapy, photothermal therapy and chemotherapy can be realized along with the release of drugs.

A nanocomposite particle, its use as a catalyst, and a method of making it are disclosed. The nanocomposite particle comprises titanium dioxide nanoparticles, metal oxide nanoparticles, and a surface stabilizer. The metal oxide nanoparticles are formed hydrothermally in the presence of the titanium dioxide nanoparticles. The nanocomposite particle is an effective catalyst support, particularly for DeNOx catalyst applications.

Disclosed herein are an anti-bacterial, anti-fungal and anti-viral composition with excellent sterilizing power, deodorization and adhesion activity, an application thereof, and a method for preparing the same. The composition with sterilizing activity against bacteria, fungus and virus comprises colloidal silver particles in an amount of from 11 wt % to 15 wt %, titanium dioxide nanoparticles in an amount of from 18 wt % to 25 wt %, a dispersion stabilizer in an amount of from 0.01 wt % to 10 wt %, a binder in an amount of from 0.1 wt % to 4 wt %, and a balance of water in an amount required to form 100 wt %.

The disclosure is directed to a method for reducing the chemical activity and photo activity of titanium dioxide nanoparticles comprising adding an amorphous alumina-stabilizing agent, specifically an anion, such as citric acid, to an aqueous slurry of the titanium dioxide nanoparticles; treating the aqueous slurry with a source of alumina, such as a solution of sodium aluminate, to form alumina-treated titanium dioxide nanoparticles; recovering the alumina-treated inorganic nanoparticles, wherein the nanoparticles have a particle size of about 50 to about 300 nm; and milling the nanoparticles to form nanoparticles having a particle size about 15% smaller than silica-treated inorganic nanoparticles milled under similar conditions. The titanium dioxide nanoparticles described herein are useful in cosmetic, coating and thermoplastic compositions.

The invention provides a method for preparing titanium dioxide nanoparticles and belongs to the technical field of inorganic material preparation processes. The method provided by the invention comprises the following steps: adding tetrabutyl titanate and concentrated hydrochloric acid to a mixed solvent of cyclohexane and ethanol, and reacting under a reflux condition to obtain monodispersed anatase-phase titanium dioxide nanoparticles. The product can be gradually transformed into rutile phase from the anatase phase by increasing the dosage of the concentrated hydrochloric acid, and as a result, the pure rutile phase can be obtained at last. The method is simple, convenient and easy to implement, and can be used for avoiding complex steps of adding a surfactant, high-temperature firing and the like of the prior art, and the obtained anatase-phase titanium dioxide nanoparticles are monodispersed and have a particle size less than 5nm; the obtained rutile-phase titanium dioxide nanoparticles have the particle size less than 10nm; the phase of the titanium dioxide nanoparticles is controlled by changing the dosage of the reactant in the same synthetic system, which is advantageous for industrial production.