28 results about "Tungsten trioxide" patented technology

The invention discloses a method for preparing a single-layer tungsten diselenide nanoband based on a space confinement strategy. By changing the flow and the growth time of hydrogen, effective control on the width and the thickness of a nanoband can be realized. The method comprises the following steps: uniformly spraying tungsten trioxide powder to one substrate, then covering the substrate by the other substrate, and forming micro reaction space which is of a 'sandwich'-like structure. Growth of a tungsten diselenide nanoband is carried out by utilizing a constant-pressure chemical vapor deposition method; physicochemical characteristics of a one-dimensional transition metal chalcogenide strongly depend on suspension key types on the edge of the one-dimensional transition metal chalcogenide, metallic properties are displayed by an ultranarrow band, and conversion from the metallic properties to semiconductor properties can be displayed from the edge to the center of a wider band; the tungsten diselenide nanoband is widely applied to micro-nano photoelectric devices due to the special property; industrial production of the tungsten diselenide nanoband can be realized through an experimental method of the invention.

This invention belongs to the field of target material preparation technology, and discloses a sintering method for a yellow tungsten oxide titanium target and the yellow tungsten oxide titanium target itself. The sintering method for the yellow tungsten oxide titanium target includes the following steps: Step 1: Heating the tungsten oxide titanium target blank to 800℃ at a heating rate of 0.5-1℃ / min, with continuous oxygen flow during the process at an oxygen flow rate of 15-20L / min; Step 2: Heating from 800℃ to 1150℃-1200℃ at a heating rate of 2-3℃ / min, holding at this temperature for 1-3 hours, with continuous oxygen flow during the process at an oxygen flow rate of 40-60L / min. This invention discloses a sintering method for a yellow tungsten oxide titanium target, employing a two-stage heating approach. In the first stage of heating, a lower heating rate and lower oxygen flow rate are used to improve the density of the target material; in the second stage of heating, a higher heating rate and higher oxygen flow rate are used to avoid deactivation of tungsten trioxide, which could lead to a change in the valence of tungsten.

The application discloses a nickel-based flux-cored wire and a preparation method and application thereof. The nano tungsten trioxide is introduced into the nickel-based flux-cored wire, the high-temperature strength and hot strength of the nickel-based alloy are improved, meanwhile, the hardness, friction performance and corrosion resistance of the alloy are improved, and the problems of low high-temperature corrosion strength, hot strength and mechanical performance of the nickel-based flux-cored wire are solved.

The application relates to a preparation method of Mg and W double-element co-modified ultra-high-nickel binary positive electrode material, in particular to Mg and W double-element co-modified high-nickel binary positive electrode material. 0.01 (Ni x Mn y )W z O2, wherein x the value of x is 0.9-0.95, y the value of y is 0.05-0.1, z the value of z is 0.003-0.006. The method comprises the following steps: (1) preparing a nickel and manganese metal salt aqueous solution, a mixed alkali aqueous solution and a reaction bottom solution; (2) respectively adding the metal salt aqueous solution and the mixed alkali aqueous solution into the bottom solution at a certain flow rate to perform a constant-temperature precipitation reaction in a nitrogen atmosphere; (3) after the precipitation reaction is completed, cooling to room temperature, filtering, washing and drying the precursor; (5) after the dried precursor is mixed with metered lithium salt, magnesium oxide and tungsten trioxide, high-temperature solid-phase reaction is performed in an oxygen atmosphere to obtain the Mg and W double-element co-modified ultra-high-nickel binary positive electrode material. The Mg and W double-element co-modified high-nickel binary positive electrode material prepared by the method has a specific capacity of 179.19 mAh / g after 100 cycles at a 0.5C rate, a capacity retention rate of 93.1% or above, and good cycle and rate performance.

The invention provides a process for preparing molybdenum and tungsten oxyhalide compounds which are useful in the deposition of molybdenum and tungsten containing films on various surfaces of microelectronic devices. In the process of the invention, a molybdenum or tungsten trioxide is heated in either a solid state medium or in a melt-phase reaction comprising a eutectic blend comprising alkaline and / or alkaline earth metal salts. The molybdenum or tungsten oxyhalides thus formed may be isolated as a vapor and crystallized to provide highly pure precursor compounds such as MoO2Cl2.

This invention discloses a method for preparing a hydrophobic modified photocatalytic-radiative cooling Janus composite membrane and its application, belonging to the fields of functional membrane materials and optoelectronic environmental protection technology. The Janus composite membrane uses polyethylene terephthalate (PET) film as a substrate, with a modified photocatalytic layer and a radiative cooling layer respectively disposed on both sides. The surface is hydrophobically modified with hexadecyltrimethoxysilane (HDTMS). The photocatalytic layer is composed of nitrogen-doped titanium dioxide, tourmaline powder, tungsten trioxide, and acrylic resin, and can catalytically degrade PM2.5 particles and the organic pollutants they carry. The radiative cooling layer is composed of micro / nano silica, hexagonal boron nitride, and alumina particles combined with resin, and can reduce the membrane surface temperature at night through radiative cooling, inducing the condensation of ambient water vapor. This invention adopts a Janus structure design with dual-sided discrete and collaborative operation, which combines the functions of photocatalytic degradation of organic pollutants, dust blocking of particulate matter, and day and night self-cleaning. It has the advantages of simple structure, no additional energy consumption, high functional integration and good long-term stability, and can be widely used in scenarios such as PM2.5 particulate dust blocking, photocatalytic degradation of organic pollutants and water purification.

This invention belongs to the field of plant tissue culture technology, specifically relating to a rapid propagation method for Fritillaria cirrhosa. The method includes the following steps: preparing explant material; sequentially subjecting the explant material to induction culture, subculture proliferation culture, and rooting culture to obtain rooted bulbs; wherein the first culture medium for induction culture contains modified nano-tungsten trioxide at a concentration of 22.0-30.0 mg / L. Based on existing technologies, this invention mainly introduces modified nano-tungsten trioxide as an exogenous inducing factor during the induction culture stage, and simultaneously adds gentiopicrin and pilocarpine as exogenous additives during the subculture proliferation culture stage. The synergistic effect of each stage significantly increases the total alkaloid accumulation of Fritillaria cirrhosa while effectively improving the overall culture efficiency, providing a new technical approach for the rapid and large-scale propagation of Fritillaria cirrhosa.

The application relates to a carbon fiber composite tungsten carbide photocatalytic material and a preparation method and application thereof. The preparation method comprises the following steps: dissolving milled tungsten trioxide and a polymer in an organic solvent, uniformly stirring to obtain an electrostatic spinning precursor solution; electrostatic spinning is performed on the electrostatic spinning precursor solution to prepare a tungsten trioxide nanofiber film; the tungsten trioxide nanofiber film is sequentially subjected to drying and calcination to obtain a pre-oxidized tungsten trioxide nanofiber film; the pre-oxidized tungsten trioxide nanofiber film is subjected to carbonization treatment in a reducing atmosphere, and finally a membrane-shaped carbon fiber composite tungsten carbide photocatalytic material is obtained. Compared with the prior art, the application can greatly improve the separation and transmission efficiency of photo-generated electrons and holes, and has a good application prospect in photocatalytic reduction of CO2.

The present application relates to the technical field of photoelectric corrosion protection, in particular to a W-WO3-TiO2 magnetron sputtering multilayer composite coating, a preparation method and application. The material comprises a three-layer composite coating from bottom to top in order, which is a tungsten transition layer, a tungsten trioxide layer and a titanium dioxide layer. A heterojunction structure is formed between the tungsten trioxide layer and the titanium dioxide layer. The present application realizes stress buffering and bonding force strengthening of the film-substrate interface through the tungsten transition layer, and realizes efficient separation of photo-generated electrons and dark state storage through the WO3 / TiO2 heterojunction, so that the coating has high film-substrate bonding strength and all-weather photoelectrochemical protection performance, and is suitable for long-term corrosion protection of metal components in marine high-salt fog and strong ultraviolet environment.

The application relates to a feeding device for tungsten powder preparation, in particular to a full-automatic auxiliary feeding device for tungsten powder preparation, which solves the problems of low automation degree, inconvenience in uniform paving and low feeding efficiency of the auxiliary feeding equipment for tungsten trioxide, a raw material, in tungsten powder preparation, and provides the following scheme, which comprises a base, a tray, a spring one, an extension piece, a feeding cylinder, a pin shaft seat one, a pin shaft, a sleeve seat, a rotating shaft, a material paving hopper, a resisting frame, an opening and closing assembly, a sliding seat, a plug-in cylinder, a swing assembly, a driving assembly and a rotating ring, a vibrating assembly is arranged on the rotating ring, the vibrating assembly is used for driving the tray, the feeding cylinder and the material paving hopper on the tray to vibrate relative to the base when the sliding seat is driven to reciprocatingly slide, so that the tungsten trioxide powder in the feeding cylinder and the material paving hopper is vibrated to completely discharge the material when the material is discharged. The device can rapidly convey the tungsten powder preparation raw material, and facilitates automatic paving, and improves the efficiency and stability of the raw material conveying for tungsten powder preparation.

The application discloses a potassium-doped graphite-phase carbon nitride / tungsten trioxide Z-type heterojunction photocatalyst and a preparation method and application thereof, and relates to the technical field of photocatalytic functional materials. The method comprises the following steps: mixing a graphite-phase carbon nitride precursor and a potassium source after grinding, so as to obtain a block product; grinding the block product into a powder, so as to obtain a K-CN product; and mixing the K-CN product and tungsten trioxide after grinding, so as to obtain the potassium-doped graphite-phase carbon nitride / tungsten trioxide Z-type heterojunction photocatalyst. The K-CN / WO3 Z-type heterojunction photocatalyst is synthesized through a calcination method, the K-CN / WO3 Z-type heterojunction photocatalyst not only retains the strong reduction capacity of K-CN and the strong oxidation capacity of WO3, but also has a strong photocurrent response, and the charge transport performance of the composite material is improved, so that the photo-generated carrier generation capacity of the material is stronger.

The application relates to the field of composite hydrogen-sensitive materials, and discloses a composite hydrogen-sensitive material and a preparation method thereof. The composite hydrogen-sensitive material contains attapulgite, tungsten trioxide and a noble metal component. Under the test conditions of a hydrogen concentration of 10%, a flow rate of 200 sccm and a hydrogen passing time of 1 min, the hydrogen-sensitive discoloration time of the composite hydrogen-sensitive material is 1-9 s, the reflectivity difference before and after discoloration is 50-90%, and the specific surface area is 120-200 m 2 / g. In the application, attapulgite with a large specific surface area and good adsorption performance is combined with tungsten trioxide, and then a noble metal component is loaded, so that a composite hydrogen-sensitive material is obtained. The material retains the advantage of a large specific surface area of attapulgite, and the surface activity is high after being combined with tungsten trioxide, the response time to hydrogen is short, the hydrogen-sensitive discoloration performance is excellent after the noble metal component is loaded, the composite hydrogen-sensitive material is simple in industry and low in manufacturing cost, and has a wider application prospect in the field of hydrogen leakage detection.

The application provides a method for determining the content of ultra-trace rare earth elements in high-purity tungsten trioxide, and particularly relates to a preparation of a quality control sample for tungsten trioxide rare earth component analysis and a method for determining the content of 14 kinds of ultra-trace rare earth elements in high-purity tungsten trioxide. The method is simple and easy to operate, solves the problem of accurate quantitative analysis of 14 kinds of ultra-trace rare earth impurities in high-purity tungsten trioxide, and solves the problem of no same-substrate quality control sample through a rapid preparation method of the quality control sample for tungsten trioxide rare earth component analysis.

This application discloses a visible light-responsive monolithic tungsten trioxide-based photocatalytic foam ceramic, its preparation method, and its application. The method includes: uniformly dispersing organic additives and pH adjusters in deionized water to form a homogeneous solution; adding tungsten trioxide powder, sintering aids, defect control agents, and photocatalytically active components to the solution in batches, uniformly dispersing them to form a suspension slurry; adding fiber / whisker reinforcement phases to form a composite slurry; impregnating organic foam in the composite slurry, followed by desizing and drying to form a composite; subjecting the composite to gradient-heating heat treatment to remove organic matter, forming a green body; and finally sintering to obtain the finished product. Furthermore, based on the electronic characteristics and molecular structure of the target pollutant, specific heterojunction systems can be matched and constructed to achieve highly efficient targeted degradation of emerging pollutants such as antibiotics, perfluorinated compounds, and phenols. The resulting photocatalytic foam ceramic possesses high structural strength, high visible light photocatalytic activity, and excellent environmental stability.

The application discloses a method for laser cladding in-situ synthesis of WO3 and Al2O3 reinforced nickel-based composite layer, relates to the technical field of metal surface modification and laser cladding, and comprises the following steps: spreading high-purity tungsten powder with a particle size of 100-270 mesh in a crucible, heating to 530 DEG C at a heating rate of 10 DEG C / min in a muffle furnace and keeping for 2 h, then air cooling to room temperature, forming a tungsten trioxide coating layer on the surface of tungsten particles, thereby obtaining core-shell structure powder of tungsten trioxide coated tungsten; mixing the core-shell structure powder with high-purity aluminum powder according to a preset mass ratio, and compounding with IN625 nickel-based alloy powder. The application improves the temperature of the molten pool and promotes the full melting of tungsten by constructing the tungsten trioxide core-shell structure and introducing aluminum thermal reaction, so that the cladding layer structure is dense and the energy requirement is reduced; meanwhile, nano-aluminum oxide is generated in-situ and dispersedly distributed, the strength, wear resistance and stability are synergistically improved, and the forming quality consistency and engineering applicability are ensured.

An integrated structure of cocatalyst / heterogeneous structure / tungsten trioxide photoanode, its preparation method, and its application are disclosed, belonging to the fields of biomass conversion and photoelectrocatalysis. First, a zinc oxide / tungsten trioxide heterostructure is synthesized via hydrothermal, spin-coating, and calcination methods. Then, a noble metal-modified nickel phosphide cocatalyst is synthesized via phosphating and loaded onto the surface of the heterostructure to successfully construct an integrated system of cocatalyst / heterogeneous structure / photoanode. The zinc oxide and tungsten trioxide heterostructure can suppress the recombination of photogenerated carriers, while the noble metal-modified cocatalyst can reduce the interfacial resistance between the heterostructure and the electrolyte, accelerate the migration of photogenerated holes, significantly reduce the surface energy barrier, improve surface reaction kinetics, and prolong the lifetime of photogenerated charges. This results in excellent photoelectrocatalytic glycerol oxidation performance, producing only two C3 products: glyceraldehyde and 1,3-dihydroxyacetone. The limited product diversity provides a feasible pathway for improving the high-value coupling of photoelectrocatalytic biomass to hydrogen production.

This invention discloses a method for in-situ growth of cadmium telluride on the surface of tungsten trioxide (TTO) and the resulting heterocomposite material. The method first prepares blue TTO rich in oxygen vacancies by irradiating TTO in formaldehyde solution with ultraviolet light. Then, utilizing the reducing properties of this blue TTO, it reacts with tellurium dioxide and a cadmium source in an alkaline aqueous solution, thereby growing cadmium telluride in situ on the surface of the blue TTO, forming a WO3 / CdTe heterocomposite material. This invention eliminates the need for an external reducing agent, utilizing the inherent properties of the carrier to drive the reaction, achieving in-situ chemical bonding between the two semiconductors and forming a tightly bonded heterojunction interface. The synthesis method of this invention effectively promotes the separation of photogenerated electrons and holes, significantly improves the photocurrent response and photocatalytic activity of the resulting heterocomposite material, and simultaneously enhances the composite material's resistance to photocorrosion, solving the problems of low charge separation efficiency of single WO3 and poor stability of single CdTe.

This invention discloses a method for fabricating a flexible electronic nose based on laser-induced graphene. A pre-defined pattern is fabricated on a selected polyimide substrate using a laser to obtain a laser-induced graphene electrode. Three different metal oxide nanoparticles—tin dioxide, tungsten trioxide, and zinc oxide-indium oxide—are selected as gas-sensitive materials. These materials are deposited on LIG using a simple process to form gas-sensitive units, which are used to construct an orthogonal sensor array. By collecting signals from the gas-sensitive units, specific signal features of the sensing units are selected to build a dataset, which is then used for pattern recognition. The final result shows a high recognition rate for single or mixed gases. The electronic nose of this invention is simple to operate, cost-effective, highly flexible, and environmentally friendly in its gas-sensitive sensing unit design. It can also be easily attached to clothing or other substrates, making it portable and wearable.

The application discloses a preparation method of a nano tungsten-based composite powder doped with carbide particles, and comprises the following steps: 1, ball-milling and uniformly dispersing tungsten trioxide to obtain pretreated tungsten source powder; 2, dispersing and surface modifying nano carbide particles, and low-energy ball-milling the nano carbide particles with the pretreated tungsten source powder to obtain nano zirconium carbide-tungsten trioxide composite powder; 3, mixing the nano zirconium carbide-tungsten trioxide composite powder with carbon nano particles, and carrying out carbon thermal pre-reduction to obtain pre-reduction powder; and 4, hydrogen-reducing the pre-reduction powder to obtain the nano tungsten-based composite powder doped with uniform carbide particles. By introducing the nano carbide particles and the carbon nano particles, and by cooperating with the carbon thermal pre-reduction and the hydrogen reduction, the nucleation rate in the reduction process is remarkably improved, the tungsten powder granularity is effectively refined, the dispersivity of the nano carbide particles and the tungsten powder particle size are regulated, and finally the nano tungsten-based composite powder doped with uniform carbide particles is obtained.

This invention discloses a synergistic water disinfection method based on photocatalysis and low-voltage electroporation using a metal oxide array, effectively addressing the problems of high byproduct risk, incomplete disinfection, high energy consumption, and limited applicability of existing water disinfection technologies. The method first prepares a metal oxide nanoarray electrode, wherein the metal oxide is any one or more composites of cuprous oxide, titanium dioxide, zinc oxide, and tungsten trioxide, and the array morphology is at least one of nanowire, nanotube, and nanosheet arrays. This electrode is then placed into the water to be disinfected as the working electrode, and a low-voltage DC electric field is applied. Subsequently, ultraviolet light excitation is performed simultaneously, utilizing the photocatalytic effect of the metal oxide array to generate active oxide species. The enhanced local electric field at the array tip induces electroporation damage to the cell membranes of pathogenic microorganisms, achieving deep water disinfection through the synergistic effect of both. This invention achieves a synergistic effect of physical membrane disruption and deep chemical inactivation.

This invention discloses a method for separating tungsten and molybdenum in solution, belonging to the field of hydrometallurgical technology. It includes the following steps: (1) Acidification separation: Acid is added to the tungsten-molybdenum-containing solution for acidification, causing tungsten to precipitate as tungstic acid, while molybdenum is preferentially retained in the acidic liquid phase; solid-liquid separation is performed to obtain tungstic acid precipitate and a molybdenum-rich solution; (2) Alkaline leaching and dissolution: After washing the obtained tungstic acid precipitate, an alkaline leaching agent is added for alkaline leaching, causing the tungstic acid precipitate to convert into soluble tungstate, resulting in a tungstate solution; (3) Re-acidification precipitation: Acid is added again to the obtained tungstate solution for acidification, causing tungsten to precipitate again as tungstic acid; purified tungstic acid precipitate is obtained through solid-liquid separation; (4) The purified tungstic acid precipitate is calcined to obtain tungsten trioxide. This invention utilizes the difference in morphology of tungsten and molybdenum in solution under acidic conditions to achieve selective precipitation of tungsten and enrichment separation of molybdenum, offering advantages such as a short process, good separation effect, and avoidance of ammonia use.

This invention discloses an in-situ synthesis method for tungsten trioxide ternary nanoheterojunction materials, comprising: hydrothermal synthesis of tungsten trioxide nanorods; conversion of tungsten trioxide into oxygen-vacancy-rich blue tungsten trioxide by ultraviolet irradiation and formaldehyde treatment; utilizing its own reducing properties, reacting with tellurium dioxide and cadmium source in alkaline aqueous solution to grow cadmium telluride in situ, obtaining a WO3 / CdTe binary heterojunction; further, after surface activation by ultraviolet irradiation and formaldehyde treatment of the obtained binary material, adding chloroauric acid solution, controlling the amount of gold source to ensure that the Au loading is 3%~10% of WO3 / CdTe by mass, and growing gold nanoparticles in situ to obtain the Au / WO3 / CdTe ternary heterojunction material. This invention eliminates the need for external reducing agents, achieves in-situ chemical bonding between multiple components, constructs a compact ternary heterostructure, and significantly improves photogenerated charge separation efficiency and photoelectrochemical performance.

This invention provides a method for the resource-based regeneration of waste tungsten based on low-temperature catalytic leaching, belonging to the technical field of waste tungsten resource recycling. The method includes: collecting tungsten waste, pre-treating it to obtain tungsten particles; adding a leaching agent and catalyst to the tungsten particles for low-temperature catalytic leaching, collecting the tungsten leachate after solid-liquid separation; adding oxalic acid to adjust the pH to 2.5-4.0, allowing it to stand to remove silicon and phosphorus, then adding sodium sulfide solution to remove heavy metals, obtaining a pure tungsten solution after solid-liquid separation; preparing ammonium paratungstate or tungsten trioxide from the pure tungsten solution; and performing staged reduction heat treatment to obtain regenerated tungsten powder. The leaching agent is a mixture of sodium hydroxide and hydrogen peroxide; the catalyst is a mixture of sodium metavanadate and sodium carbonate. This invention covers the entire process of tungsten waste recycling, pre-treatment, leaching, purification, product preparation, and waste recycling, with each link working synergistically to form a closed-loop industrial chain, maximizing the utilization of waste tungsten resources and avoiding resource waste.

The application discloses a rare earth doped photochromic material and a preparation method and application thereof, and belongs to the technical field of inorganic photochromic materials. The application solves the problem of the complex process of the organic photochromic material in the prior art, the difficulty in realizing industrial application, and the poor photochromic effect and poor color fading reversibility of nano tungsten trioxide. The photochromic material has a chemical composition as shown in the following formula (1): WO3:xRe,yM formula (1), wherein Re is a rare earth element, M is selected from at least one of redox metal ions, x represents the mole fraction of the Re element, and the value range is 0 < x <= 0.5, and y represents the mole fraction of M, and the value range is 0 <= y <= 0.05. Based on the surface defect construction and the energy transfer between the rare earth luminescent ions and the tungsten trioxide, the photochromic performance of the material is greatly improved. The application has the advantages of fast response speed, high color difference value, and simple and controllable preparation process.

This invention discloses a method for preparing columnar crystalline tungsten dioxide by stepwise hydrogen reduction, belonging to the field of tungsten oxide material preparation technology. The method includes: placing tungsten trioxide in a reduction reactor and purging it under an inert atmosphere; then performing a two-step hydrogen reduction: first, a first-step hydrogen reduction is performed at 550-650℃ for 3-5 hours in a mixed atmosphere of argon and hydrogen, converting tungsten trioxide into fibrous purple tungsten; then, a second-step hydrogen reduction is performed at 700-780℃ for 2-4 hours in a hydrogen atmosphere, converting the fibrous purple tungsten into columnar crystalline tungsten dioxide; after reduction, cooling is performed under a protective atmosphere to obtain columnar crystalline tungsten dioxide. This invention, through the synergistic control of the two-step hydrogen reduction process, effectively suppresses the morphology damage caused by the chemical vapor transport effect, achieving directional and controllable preparation of columnar crystalline tungsten dioxide, producing a product with high purity and no impurities, with a stable and reliable process, and easy for large-scale production.

The application discloses a catalyst for N-VOCs catalytic degradation ammonia and SCR denitration, and a preparation method and application thereof, and belongs to the technical field of environmental catalysis. The application provides a core-shell structure bifunctional catalyst, the inner core of which is a spherical defective titanium dioxide loaded with silver, and the shell is an anatase titanium dioxide coating layer loaded with vanadium pentoxide and tungsten trioxide. The catalyst realizes the partition design of active components: the silver in the catalyst is used as the active center for N-VOCs catalytic degradation, the vanadium pentoxide outside is used as the main active component for NH3-SCR, and the tungsten trioxide is used as an additive. The catalyst physically separates the N-VOCs degradation ammonia region and the NH3-SCR reaction region, not only avoids the competitive adsorption of different atmospheres on the catalyst surface, but also realizes the efficient synergistic removal of N-VOCs and NO x by in-situ conversion of ammonia from the degradation product to the denitration reactant.