712 results about "Tungsten oxide" patented technology

The invention relates to the field of optical protection materials, and provides a transparent film with laser eavesdropping prevention performance and a preparation method thereof.The transparent film is composed of surface-modified doped tungsten oxide nanosheets, amino-isocyanate bifunctional lithium niobate nanowires, urethane acrylate, an ultraviolet light absorber, a silane coupling agent, a dispersing agent and a flatting agent; the molybdenum-doped tungsten oxide nanosheets are obtained through silane coupling modification after hydrothermal synthesis, and the lithium niobate nanowires are prepared through a gradient modification process of hydrothermal synthesis-silane coupling-isocyanate grafting-phenol end capping. A modified nano material is uniformly dispersed in a resin matrix through an ultrasonic dispersion composite technology, and through blade coating forming, ultraviolet curing and constant-temperature and constant-humidity post-treatment, compared with the prior art, the scheme overcomes the problems that a traditional protective film is insufficient in optical transparency, laser eavesdropping prevention function and dynamic viscoelasticity, and is suitable for the field of high-end security and protection.

The invention belongs to the technical field of high polymer materials, and particularly relates to a PVB (Polyvinyl Butyral) film and a preparation method thereof. The PVB film provided by the invention is prepared from the following components in parts by mass: 100 parts of PVB resin, 33 to 36 parts of triethylene glycol di-2-ethylhexoate, 7 to 9 parts of integrated anti-radiation toughening filler, 1 to 2 parts of organic montmorillonite, 0.8 to 1.2 parts of composite coupling agent, 0.5 to 1 part of ultraviolet light absorber, 0.6 to 0.8 part of antioxidant and 0.8 to 1 part of heat stabilizer. The integrated anti-radiation toughening filler adopts a core-shell structure, the anti-radiation core is composed of bismuth oxide and tungsten oxide according to the mass ratio of 3: 1, and the elastic coating layer is maleic anhydride grafted modified POE. The preparation method comprises the steps of pre-dispersion treatment, component mixing, melt extrusion, film casting, graded cooling, two-way stretching and the like. Through the core-shell structure design of the integrated anti-radiation toughening filler and the optimized processing technology, the anti-radiation performance and the toughening performance are synergistically improved, and the prepared film has the advantages of excellent anti-radiation effect, high toughness and good transparency.

The invention provides conductive paste, a solar cell, a preparation method of the solar cell and a photovoltaic module. The conductive paste comprises the following components in parts by weight: 70-85 parts of silver powder, 3-8 parts of glass powder, 0.1-2 parts of an additive and 12-25 parts of an organic carrier, wherein the silver powder comprises spherical silver powder and flaky silver powder; the glass powder is prepared from the following components in parts by weight: 65 to 75 parts of Bi2O3, 18 to 25 parts of TeO2 and 8 to 12 parts of V2O5; the additive is a carbon material and / or conductive metal oxide nanoparticles; the organic carrier comprises an infrared absorbing material; the infrared absorption material is selected from any one or more of copper phthalocyanine, a polyaniline-carbon nanotube compound and a tungsten oxide nanowire. The conductive paste can improve the conductivity of the conductive paste and improve the efficiency of the conductive paste in a laser sintering process, so that the contact resistivity is reduced, and the photoelectric conversion efficiency of a photovoltaic solar cell is improved.

The invention belongs to the technical field of superfine tungsten powder, and particularly relates to superfine tungsten powder and a preparation method thereof.The preparation method includes the steps that an ammonium tungstate solution, hydrochloric acid and carbon black serve as raw materials to prepare a mixture of tungstic acid and a carbon precursor; calcining the tungstic acid and carbon precursor mixture in a nitrogen atmosphere to obtain a tungsten oxide and carbon mixture; a tungsten oxide and carbon mixture is calcined in an argon atmosphere, the argon atmosphere is kept for natural cooling, the superfine tungsten powder is obtained, the superfine tungsten powder is uniform in dispersion, complete in grain development, smooth in surface, free of pores and complex in morphology, the crystal structure of the superfine tungsten powder is a body-centered cube, the average particle size is smaller than or equal to 0.7 micrometer, and the specific surface area is smaller than or equal to 1.0 m < 2 > / g.

The invention discloses a novel photocatalyst for producing hydrogen from organic matter wastewater and a preparation method of the novel photocatalyst, and relates to the technical field of photocatalysis. The photocatalyst disclosed by the invention is combined with oxidation-reduction capability, and can effectively degrade and produce hydrogen under the irradiation of sunlight. Through combination of quaternized porous tungsten oxide and vanadate radicals, silver vanadate load growth is promoted, the sunlight utilization rate is increased, and the electron-hole recombination rate is reduced. Reduced graphene oxide is used for pretreatment, active groups are introduced, the reduced graphene oxide is compounded with tungsten oxide / silver vanadate, the binding force is enhanced through heat treatment, photo-induced electron-hole pair compounding is inhibited through the conductivity, and the visible light catalytic performance is improved. The adsorption effect of porous tungsten trioxide and reduced graphene oxide can accelerate the degradation of organic matters. By optimizing the proportion of silver vanadate, tungsten oxide and reduced graphene oxide, the visible light response and charge separation efficiency are enhanced, the degradation and hydrogen production performance is improved, and light corrosion is reduced.

The invention relates to the technical field of electrochromism coating, in particular to an electrochromism device coating process and method, and the electrochromism device coating process comprises the following steps: step 1, substrate pretreatment: cleaning attachments on the surface of a flexible substrate through ultrasonic cleaning and plasma treatment; step 2, conducting layer deposition treatment: depositing an indium tin oxide (ITO) conducting layer on the substrate at the deposition temperature of 100-380 DEG C, the thickness of 200-350 nm and the vacuum degree of less than or equal to 10 <-5 > Pa; step 3, electrochromic layer deposition treatment: sequentially depositing a tungsten oxide (WO3) layer and a nickel oxide (NiO) layer through a magnetron sputtering process, and controlling the film thickness ratio of NiO to WO3 to enable the ratio of NiO / W to be 0.25-0.357; 4, annealing treatment is conducted, specifically, annealing is conducted for the first time at the temperature of 200-500 DEG C, and the annealing time is 200-300 seconds; and secondary annealing is conducted, specifically, annealing is conducted at the temperature of 400 DEG C, and the annealing time ranges from 200 seconds to 800 seconds. The effect of improving the yellow ground color of the electrochromic device is achieved.

The invention relates to the technical field of semiconductor manufacturing, and discloses a tungsten oxide etching method, a semiconductor structure and a chip, and the method comprises the steps: forming a tungsten oxide thin film on a substrate; forming a mask layer with a target pattern on the tungsten oxide thin film; etching the tungsten oxide thin film with the mask layer by adopting mixed gas in ICP etching equipment; in the ICP etching equipment, the mixed gas comprises trifluoromethane and argon, the ratio range of the trifluoromethane in the mixed gas is 22.5%-74.1%, the flow rate of the mixed gas is 135-155 sccm, the ratio range of ICP power to bias power is 1.53: 1-3.3: 1, the depth-to-width ratio range of the tungsten oxide etching structure is 10: 1-23: 1, the inclination angle of the side wall of the tungsten oxide etching structure is 40-90 degrees, and the width of the tungsten oxide etching structure is 20-30 degrees. The technical problem that it is difficult to achieve a tungsten oxide etching structure with the nanoscale line width and the high aspect ratio in the prior art is solved.

The invention relates to the technical field of functional materials, in particular to a polyvinyl butyral flexible material as well as a preparation method and application thereof. The molecular chain regularity is destroyed through an isobutyraldehyde branched chain, the crystallinity is reduced, and the flexibility is improved; cesium-tin co-doped tungsten oxide has high infrared rejection rate and good dispersity, and the influence on the flexibility of the material is reduced; magnesium salicylate and magnesium formate are compounded, so that the reaction activity with resin is reduced, and the bonding stability in the bending process is ensured; the flexibility and migration resistance of the material are synergistically improved through the flexible plasticizer, and the interlayer sheet is prevented from being sticky; the flexible reinforcing agent polycaprolactone micro powder is used for forming an elastic node, bending stress is absorbed, and the recovery performance is improved. The polyvinyl butyral flexible material provided by the invention has flexible bending performance, an efficient infrared barrier function and stable bonding performance, is suitable for scenes such as curved building curtain walls, special-shaped automobile sunroofs or arc-shaped rail traffic windows, and has a wide application prospect.

The invention provides a rapid preparation method of tungsten trioxide, which specifically comprises the following steps: step 1, weighing crude tungstic acid, dissolving in ammonia water, heating and stirring to obtain an ammonium tungstate solution; step 2, slowly dropwise adding the ammonium tungstate solution in the step 1 into a poor solvent to obtain an ammonium paratungstate suspension, and step 3, filtering the ammonium paratungstate suspension in the step 2 to obtain an ammonium paratungstate filter cake, and leaching the ammonium paratungstate filter cake with the poor solvent; 4, the ammonium paratungstate filter cake in the step 3 is placed in a drying oven to be dried; and (5) roasting the ammonium paratungstate filter cake in the step (4) at high temperature to obtain a faint yellow irregular flaky tungsten trioxide product. According to the preparation method, a mixed solvent crystallization and high-temperature roasting two-step process is adopted, the solubility of ammonium tungstate in water is reduced by adding a poor solvent, so that an ammonium tungstate solution rapidly reaches a saturated state and is separated out, the crystallization process of ammonium paratungstate is accelerated, and the preparation speed and the crystallization rate of a tungsten trioxide product are high.

The invention provides a titanium-based ceramic target material and a preparation method and application thereof.The titanium-based ceramic target material is prepared from, by mass, 96.4 wt%-98.3 wt% of titanium oxide and 1.7 wt%-3.6 wt% of doped oxide, and the doped oxide is prepared from, by mass, 0.8 wt%-1.5 wt% of niobium oxide, 0.5 wt%-1.0 wt% of tantalum oxide, 0.3 wt%-0.8 wt% of tungsten oxide and 0.1 wt%-0.3 wt% of aluminum oxide. According to the method, the high-performance titanium-based ceramic target material is prepared by adopting a normal-pressure sintering method through multi-element synergistic doping and dynamic regulation and control of the sintering atmosphere, the titanium-based thin film prepared by sputtering the titanium-based ceramic target material can form a laminated thin film structure with an indium tin oxide (ITO) thin film, and high conductivity, high visible light transmittance and high electron mobility are achieved; and the actual requirements in the field of silicon-based and perovskite solar cells are met.

The invention discloses a full-spectrum protective anti-fingerprint resin lens and a preparation method thereof. The full-spectrum protective anti-fingerprint resin lens comprises a functionalized resin base material and a gradient composite functional coating. The base material takes polyurethane acrylate as a matrix, and nano cerium oxide, nano barium titanate and nano tungsten oxide functional particles are uniformly dispersed through in-situ polymerization, so that base material intrinsic protection on ultraviolet rays, harmful blue light and near-infrared light is realized. The gradient coating comprises an adhesion promoting layer, a full-spectrum repairing and protecting layer and an anti-fingerprint layer from inside to outside, a stable composite system is formed through chemical bonding, protection is further reinforced, and the lens is endowed with super-hydrophobic and oleophobic anti-fingerprint characteristics. Through the integrated design of base material modification and coating compounding, the technical problems that an existing lens is single in protection wave band, not lasting in performance and prone to being stained with fingerprints are solved, and meanwhile the lens has high light transmittance, low reflection, excellent wear resistance and impact resistance and excellent comprehensive performance.

The invention belongs to the technical field of functional materials, and particularly relates to ultra-thick tabular tungsten oxide and a preparation method thereof.The preparation method of the ultra-thick tabular tungsten oxide comprises the following steps that S1, ammonium tungstate is added into deionized water and stirred to be dissolved at the temperature of 70-90 DEG C, and a clarified ammonium tungstate solution is obtained; s2, cooling the clarified ammonium tungstate solution to normal temperature at a cooling rate of 0.5-2 DEG C / h, and then carrying out suction filtration to obtain plate-shaped ammonium tungstate crystals; s3, calcining the tabular ammonium tungstate crystal to obtain ultra-thick tabular tungsten oxide; ammonium tungstate is adopted as a raw material, controllability is high, tungsten oxide which is uniform in particle size and complete in plate shape is obtained through optimized crystallization and calcination, the purity is larger than or equal to 99%, the problems that traditional tungsten oxide is agglomerated and disordered in shape are solved, functional adaptability is high, the plate-shaped structure can be directionally oriented, the dielectric performance, the breakdown performance and other performance are improved, and the method is suitable for multiple high-end scenes; parameters are easy to control, and operation is simple, green and safe.

This invention proposes a tapered fiber optic hydrogen sensor and its fabrication method, belonging to the field of hydrogen sensors. The sensor includes a tapered section in the middle of an optical fiber; a sensing element tightly fitted around the tapered section; a light source inputting an optical signal into the optical fiber; a spectrometer measuring the position of characteristic peaks in the optical fiber's spectrum; and a three-layer thin-film structure comprising the sensing element from the inside out: an excitation layer that excites the optical fiber surface to generate a plasmon resonance effect; a reaction layer made of a gas-sensitive material that reacts with hydrogen; and a catalytic layer that catalyzes the reaction between the gas-sensitive material and hydrogen. This invention employs a tapering method to fabricate the fiber optic sensor, significantly improving its sensitivity. Using tungsten oxide and gold co-sputtering material as the gas-sensitive material greatly improves the response and recovery times compared to using only tungsten oxide.

The invention discloses a sodium metavanadate-based catalyst activity gradient regulation and regeneration system and method, and relates to the technical field of industrial catalyst regeneration, the sodium metavanadate-based catalyst is of a unique layered structure, the sodium metavanadate-based catalyst comprises an outer layer, a middle layer and an inner layer from the surface to the interior in sequence, and active components and doping elements of all the layers are different; the outer layer is doped with high-content sodium metavanadate and manganese oxide, reactant molecules can be quickly adsorbed and activated in the initial stage of the reaction, the manganese oxide can provide additional active sites, reduce reaction activation energy and promote quick start of the reaction, and the middle layer is doped with a proper amount of sodium metavanadate and cerium oxide, so that the reaction is more stable in the process of the reaction. The cerium oxide can adjust migration and conversion of oxygen species on the surface of the catalyst, optimize the reaction path, improve the selectivity of a target product and reduce side reactions, the inner layer is doped with the low-content sodium metavanadate and tungsten oxide, and the structural stability of the catalyst under high-temperature and long-time reaction is maintained by means of the high stability of the tungsten oxide.

The invention relates to a multi-element synergistic doped ATO target material and a preparation method thereof. Comprising the following steps: 1) uniformly mixing water and a powder dispersant, then adding an oxide 1 (at least one of tantalum pentoxide, niobium pentoxide, vanadium pentoxide, gallium oxide and tungsten trioxide), an oxide 2 (at least one of zinc oxide, copper oxide, cobalt oxide, manganese oxide and cerium oxide) and ATO raw material powder, and mixing and homogenizing to prepare slurry; 2) grinding the slurry and adding a powder forming adhesive; 3) carrying out spray drying granulation on the ground slurry; according to the preparation method, the ATO target material with high compactness (relative density gt, 98.5%) and low resistance (resistivity lt, 5 * 10 <-3 > omega.cm) is prepared through multi-element synergistic doping of the oxide, and the problem that compactness and conductivity of the ATO target material are difficult to consider at the same time in the prior art is solved.

The invention provides a long-circulation high-rate negative electrode material as well as a preparation method and application thereof, and belongs to the technical field of negative electrode materials. Silicon powder, tin powder and graphene are compounded and subjected to carbon coating, a three-dimensional conductive network is constructed, volume expansion is relieved, and conductivity, cycling stability and rate capability are improved; tungsten oxide serves as an interface stabilizer to form a protective layer, side reaction is inhibited, interface impedance is reduced, and a conductive network is enhanced; metaphosphoric acid is decomposed to generate an inorganic phosphate protective film, and nitrogen-doped carbon generated by urea decomposition is combined, so that the interface stability and conductivity are remarkably improved, and the cycle life is remarkably prolonged; lithium carbide reacts with vinylidene fluoride to generate a lithium fluorocarbon additive, and lithium ions are released in stages to reduce the first lithium loss and stabilize an interface; a vanadium-based metal-organic framework prepared from ammonium metavanadate and terephthalic acid is combined with pre-embedded lithium and graphitized carbon coating, so that a lithium ion transmission path is optimized, and the performance of the lithium ion battery is improved. The synergistic modification measures improve the long cycle stability and high rate performance of the negative electrode material.

The invention discloses a tungsten trioxide electrochromic film for multi-tungsten oxygen cluster induced in-situ crystallization as well as a preparation method and application of the tungsten trioxide electrochromic film. The preparation method comprises the following steps: S1, adding hydrochloric acid into a sodium tungstate dihydrate aqueous solution to obtain a precipitate; washing the precipitate until the pH value of the supernate is greater than 3, and then drying the precipitate to obtain hydrated tungstic acid powder; dissolving the hydrated tungstic acid powder in a hydrogen peroxide solution to obtain a peroxy tungstic acid solution; s2, heating, evaporating and concentrating the peroxy tungstic acid solution to obtain a precursor solution containing multi-tungsten-oxygen clusters; and transferring the precursor solution containing the multi-tungsten-oxygen cluster to a substrate by adopting a film coating process, and annealing to obtain the tungsten trioxide electrochromic film with multi-tungsten-oxygen cluster induced in-situ crystallization, a matrix of the tungsten trioxide electrochromic film for multi-tungsten-oxygen cluster induced in-situ crystallization is amorphous tungsten trioxide, and hexagonal-phase tungsten trioxide nanocrystals are dispersed and distributed in the amorphous tungsten trioxide.

According to one embodiment, a tungsten oxide material containing potassium is provided. The tungsten oxide material has a shape of particles including a central section and a peripheral section adjacent to the central section, and having an average particle size of 100 nm or less. A periodicity of a crystal varies between the central section and the peripheral section. In addition, a tungsten oxide powder mass for an electrochromic device including 80% by mass to 100% by mass of the tungsten oxide material is provided. Moreover, a slurry for producing an electrochromic device containing the above tungsten oxide material is provided.

The invention discloses a preparation method of a gradient film containing tungsten oxide and silicon nitride. The method comprises the following steps: selecting a substrate and cleaning the substrate; vacuumizing to basic vacuum, introducing high-purity argon and oxygen, starting to sputter a tungsten target, and depositing a uniform tungsten oxide layer; the titanium target is sputtered at low frequency, meanwhile, the sputtering frequency of the tungsten target is gradually reduced, when the sputtering frequency of the tungsten target is reduced to 0, the sputtering frequency of the titanium target reaches the highest value, nitrogen is started to be introduced, the silicon target is sputtered at low frequency, the sputtering frequency of the silicon target is gradually increased, and the sputtering frequency of the titanium target is gradually reduced; when the sputtering frequency of the titanium target is reduced to 0, the sputtering frequency of the silicon target reaches the highest value, and independent sputtering of the silicon target is carried out; and annealing and polishing the gradient film. The titanium element is added, so that the gradient film is of a three-element structure, the strength of the gradient film can be effectively enhanced, and the overall quality of the gradient film is improved.

The invention discloses a preparation method of high-purity nano tungsten oxide, which comprises the following steps: S1, dispersing an ammonium metatungstate crude product in ethanol to obtain a mixture, and centrifugally separating the mixture with the ammonium metatungstate crude product to obtain solid ammonium metatungstate and an impurity solution; s2, dissolving the ammonium metatungstate crude product solid ammonium metatungstate in water to obtain an ammonium metatungstate aqueous solution, and then sequentially adding a complexing agent and a chelating agent to obtain a mixed solution; s3, stirring the mixed solution with the ammonium metatungstate crude product, performing evaporative crystallization to obtain crystals, and then calcining the crystals with the ammonium metatungstate crude product to obtain the high-purity nano tungsten oxide with the ammonium metatungstate crude product; according to the method, ammonium metatungstate is primarily purified by utilizing the solubility difference of ethanol on ammonium metatungstate and water-soluble inorganic salt, transition metal impurities and alkaline earth metal ion impurities are sequentially complexed by combining a complexing agent and a chelating agent, step-by-step purification is performed, meanwhile, charge adsorption on the surfaces of particles is reduced, ammonium metatungstate agglomeration is inhibited, and the purity of the ammonium metatungstate is improved. The particle size is uniform and dispersed.

According to one embodiment, provided is a tungsten oxide powder including primary particles having an average particle size of 100 nm or less. Each of the primary particles include a crystal phase and an amorphous phase coexisting in each primary particle.

The invention relates to the technical field of ceramic substrates, and provides a high-resistivity aluminum nitride ceramic substrate and a preparation method thereof. The high-resistivity aluminum nitride ceramic substrate comprises the following raw materials in parts by weight: 75-85 parts of aluminum nitride powder, 4-8 parts of a sintering aid, 3-6 parts of a functional aid, 8-12 parts of a binder, 1-5 parts of a plasticizer, 1-3 parts of a dispersant and 65-75 parts of a solvent, the functional additive comprises carbide, tungsten oxide and yttria-stabilized zirconia in a mass ratio of (1-9): 2: 1. According to the technical scheme, the problem of insufficient strength of the aluminum nitride ceramic substrate in the prior art is solved.

The invention discloses a method for controllably synthesizing intermediate valence tungsten oxide (WO3-x, 0.1 < = x < = 1) through a carbon reduction method, and belongs to the technical field of non-ferrous metal material preparation. The preparation method comprises the following steps: (1) mixing high-valence tungsten oxide powder with carbon powder, and carrying out uniform ball milling; and (2) putting the mixed powder under inert gas protection or vacuum conditions, and carrying out reduction reaction at high temperature. Tungsten oxide with different intermediate valence states is obtained by controlling the carbon type, the use amount, the temperature and the time. The method is suitable for precise preparation and phase structure regulation of the functional tungsten oxide intermediate, and can be used as a precursor of a new energy battery material or electrochromic and photochromic high-performance materials and the like.

The present invention relates to composite tungsten oxide particles containing a composite tungsten oxide represented by the general formula MxWyOz (wherein M element is one or more elements selected from the group consisting of alkali metal elements, alkaline earth metal elements, rare earth elements, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and I, 0.20 < = x / y < = 0.37, 2.2 < = z / y < = 3.3), and having a hexagonal crystal system, in which when observed in STEM-HAADF 0.01% to 10% inclusive of the Z contrast of W atoms is reduced to 95% or less of the average value.

This invention provides nano-tungsten carbide and its preparation method, belonging to the field of nanopowders. The method for preparing nano-tungsten carbide includes the following steps: gaseous tungsten oxide (after vaporization) is passed into an organic solvent to obtain a dispersion of nano-tungsten oxide; the dispersion is mixed with a building agent and dried, allowing the nano-tungsten oxide to enter the interior of carbon nanotubes, resulting in a building material; the building agent includes carbon nanotubes; the building material is then subjected to reduction carbonization to obtain the nano-tungsten carbide. This invention utilizes the high activity of nano-tungsten oxide prepared by sublimation, enabling rapid adsorption into the interior of carbon nanotubes, thereby achieving the preparation of the building material; furthermore, after the nano-tungsten oxide is introduced into the carbon nanotubes, the carbon nanotubes restrict the growth of powder particles during the reduction carbonization process, achieving controllable powder size.

The invention discloses a high-temperature denitration catalyst used based on a garbage incinerator and a preparation process thereof, and relates to the technical field of catalysts, the high-temperature denitration catalyst comprises a catalyst, the catalyst takes anatase type titanium dioxide as a carrier and vanadium pentoxide and tungsten oxide as active components, nickel powder is added to prepare a mixed solution, and the mixed solution is used for dipping, calcining and forming the carrier. A large amount of nickel powder is added into an original catalyst for mixing, so that when the catalyst is in a garbage incinerator, the provided high-temperature condition drives nickel and oxides to react with water vapor, the existence of water in a catalyst environment is reduced, the reaction of SO2 and NH3 is improved, the conversion rate of NO is increased, and the conversion performance of the catalyst is improved.

Main performance index parameters of the blue tungsten powder are as follows: the oxygen index of the blue tungsten powder is 2.90-2.94, the microcosmic surface of blue tungsten powder particles is in a shape of being full of fine needle-shaped tungsten oxide, the specific surface area of the blue tungsten powder reaches 10-14 m < 2 > / g, and the surface area of the blue tungsten powder is 10-14 m < 2 > / g. The method is suitable for producing high-quality fine, superfine and nano-particle tungsten powder, tungsten carbide powder, corresponding hard alloy and other products.

The invention belongs to the technical field of tungsten and tungsten products, and particularly relates to a doped tungsten oxide composite material and a preparation method and application thereof. The invention provides a method for preparing doped tungsten oxide by a chemical precipitation method, which comprises the following steps: dispersing two aqueous solutions in the form of tiny liquid drops in an atomization manner, and carrying out chemical reaction at the moment of contact and mixing, so that rare earth element cations are rapidly combined with hydroxyl anions in an alkaline environment; the preparation method comprises the following steps: adding ammonium paratungstate into an ammonium paratungstate precursor, quickly drying at high temperature, nucleating to obtain the doped ammonium paratungstate precursor, realizing uniform distribution of rare earth elements, and calcining at high temperature to obtain the doped tungsten oxide composite material with uniform particle size. The invention aims to provide a preparation method of a short-process doped composite material powder which can be efficiently industrialized and is uniform in nanoscale particle size.

The invention provides a tungsten oxide quantum dot-metal nano material photochromic composite film and a preparation method thereof. A metal nano material and tungsten oxide quantum dots are uniformly compounded by utilizing a water-soluble high polymer material. And the tungsten oxide quantum dot-metal nanomaterial photochromic composite film with more excellent photochromic performance than tungsten oxide is prepared. According to the tungsten oxide quantum dot-metal nano material photochromic composite film, the photochromic fading time is shortened to be within 2 hours, and the light modulation amplitude is gt; and the film has self-supporting performance. Compared with the prior art, the method for preparing the tungsten oxide quantum dot-metal nano material photochromic composite film is simple in process, controllable in process, free of expensive equipment and raw materials, good in process stability, high in yield and high in yield. The prepared tungsten oxide quantum dot-metal nano material photochromic composite film can be applied to any glass or resin substrate.

The invention belongs to the technical field of preparation of methyl tetrahydrophthalic anhydride, and particularly relates to a methyl tetrahydrophthalic anhydride isomerization catalyst and a preparation method thereof. The catalyst provided by the invention adopts a three-layer core-shell structure, and magnetic separation and recovery are realized by a magnetic Fe3O4-coated SiO2 / Al2O3 core layer; the alkaline middle layer of the mesoporous carbon loaded nano MgO is isolated by a PDMS hydrophobic layer; and the zirconium-based MOF acidic shell layer contains a sulfonic acid group and tungsten oxide. An Al2O3 protective layer and a tungsten oxide Lewis acid site are constructed through an atomic layer deposition technology, and coexistence of acid-base active sites is realized by combining PDMS interface isolation. The catalyst provided by the invention solves the problem of separation of a traditional homogeneous catalyst, synergistically regulates and controls the structure / stereoisomerization reaction, the product purity reaches 99% or above, and the catalyst is suitable for industrial continuous production.