335results about "Tungsten compounds" patented technology

The invention relates to the technical field of materials, in particular to preparation of an amphiphilic tungsten disulfide nano material and application of the amphiphilic tungsten disulfide nano material in preparation of an oil displacement agent. The oil-displacing agent prepared from the amphiphilic tungsten disulfide nano material can reduce the interfacial tension of an oil-water interface, and can be quickly adsorbed to the oil-water interface to layer oil and water; the surface wettability of the rock is changed, the lipophilicity of the rock is changed into weak hydrophilicity, and the pore throat cannot be blocked due to excessive hydrophilicity while the oil phase is stripped. The nano oil-displacing agent disclosed by the invention can still have an enough stable use effect after being frozen at a low temperature and then unfrozen.

The present invention relates to a niobium metal oxide, niobium metal oxide secondary particles and a method for preparing the same, and a working electrode and an electrochemical cell comprising the niobium metal oxide secondary particles. The niobium metal oxide has the formula (I): NbxMyOz, where M is a metal selected from the group consisting of Ti, Zr, V, Cr, W and Mo, x is 2 to 18, z is 2.5 x + 3y and x / y is 1 to 3, and the crystal structure of the niobium metal oxide is a tetragonal tungsten bronze structure having four or eight pentagonal channels per cell, and a portion of the pentagonal channels is filled with-Nb-O-Nb-O-chains, and the remainder of the pentagonal channel is optionally embedded with lithium.

The application relates to a preparation method and application of a ball milling-calcination process-prepared cesium vanadium tungstate mixed heat insulation coating, and belongs to the technical field of heat insulation coatings. The application aims to solve the problems of high preparation cost, strict requirement on equipment, long preparation time and difficult morphology control of vanadium dioxide and cesium tungsten bronze used in the existing cooling coating. The prepared cesium vanadium tungstate mixed heat insulation coating is coated on the surface of glass, mainly aiming at blocking the infrared light thermal radiation in sunlight, the new type of high-efficiency heat insulation film utilizes the light absorption and phase change reflection characteristics of nanometer cesium tungsten bronze and vanadium dioxide to realize heat insulation. The application adjusts the proportion of cesium, vanadium and tungstate to adjust the heat insulation performance, the heat insulation coating is prepared through different proportions of acrylic resin / organic silicon resin, solvent, cesium vanadium tungstate mixed heat insulation coating and the like, and the heat insulation film with excellent infrared blocking property, good stability and excellent light transmittance is obtained.

A modified lithium-rich manganese-based positive electrode material, and a preparation method therefor and the use thereof. The modified lithium-rich manganese-based positive electrode material comprises a lithium-rich manganese-based positive electrode material, wherein the bulk phase of the lithium-rich manganese-based positive electrode material is doped with a high-valent transition metal element, and the surface phase of the lithium-rich manganese-based positive electrode material has a lithium metal compound coating layer and an oxygen vacancy. In the modified lithium-rich manganese-based positive electrode material, the doping with a bulk-phase high-valence transition metal element, the coating with a surface-phase lithium metal compound coating layer and the construction of an oxygen vacancy are conducted at the same time; and by means of the co-action of the three, the rate capability and the cycling performance of the lithium-rich manganese-based positive electrode material can be significantly improved, which is of great significance for the further commercialization of the lithium-rich manganese-based positive electrode material.

The application belongs to the technical field of fluorescent material synthesis, and particularly relates to a blue fluorescent powder with self-activation effect and a preparation method thereof, the chemical formula of the blue fluorescent powder is Li2Mg2W2O9 or Li2Zn2W2O9; the preparation comprises the following steps: 1) according to the chemical proportion of the fluorescent powder, magnesium / zinc source, lithium source and tungsten source are weighed and uniformly ground; 2) the uniformly ground mixed powder is placed into an alumina crucible, sintering is carried out, and the product is fully reacted after heat preservation for a period of time; 3) the product is uniformly ground again after cooling, and the blue fluorescent powder with self-activation effect is obtained. The application utilizes the special lattice structure of the substrate, and obtains the blue fluorescent powder with self-activation effect under an air atmosphere; the generated product has high purity, simple synthesis conditions, low cost and is easy to be prepared on a large scale; the prepared fluorescent powder has a high internal quantum efficiency of 68.7%, high luminous intensity and unique blue light emission characteristics.

The invention discloses a high-voltage lithium nickel manganese oxide positive electrode material and a preparation method thereof, a battery positive electrode and a battery, and belongs to the technical field of lithium ion battery materials. Comprising an inner core composed of a lithium-containing compound, the inner core is coated with a shell composed of tungstate, and a transition layer is arranged between the inner core and the shell. The tungstate has good chemical and thermodynamic stability, can prevent erosion of HF in the electrolyte, inhibit dissolution of transition metal, reduce the shuttle effect, and can greatly improve the capacity retention rate of the battery. The preparation method is simple in process steps and convenient for large-scale preparation. Meanwhile, the cathode material coated with magnesium tungstate, calcium tungstate or bismuth tungstate has good dynamic performance, the capacity and the rate capability are remarkably improved, meanwhile, the stability of the material is also remarkably improved, and a good application way is provided for application of the high-voltage type lithium nickel manganese oxide cathode.

Disclosed in the present application are a lithium replenishing additive and a preparation method therefor, a positive electrode slurry and a battery. The lithium replenishing additive comprises: an inner core, the inner core satisfying the chemical formula LixM1yM21-yO6, wherein 6≤x≤8, 0<y<1, M1 is at least one of Zr, Nb, Sb, Bi, Ru, Ta, Sn, Hf, Ir, Pr, Pt and Np, and M2 is at least one of W, Ge, Ca, Ce, K and Ta; and a coating layer, the coating layer being at least provided on part of the surface of the inner core, the coating layer comprising a lithium-containing metal oxide and a carbon material, and the lithium-containing metal oxide satisfying the chemical formula LiaMbOc, wherein 1.8≤a≤2, 0.7≤b≤1.1, 2.8≤c≤3 and M comprises Ti and / or Zr. The lithium replenishing additive exhibits a diffraction peak intensity S1 relative to an X-ray within the 2θ diffraction angle of 20.1°-20.3° and exhibits a diffraction peak intensity S2 relative to the X-ray within the 2θ diffraction angle of 17°-17.3°, S1 / S2 being 0.02-0.05.

The invention belongs to the technical field of tungsten hydrometallurgy, and particularly relates to a method for improving the crystallization rate of ammonium paratungstate, which comprises the following steps: S1, obtaining an ammonium tungstate solution which comprises metatungstate ions; s2, adding a supersaturation degree regulator into the ammonium tungstate solution, wherein the supersaturation degree regulator comprises hydrogen peroxide and ammonia water; s3, heating the ammonium tungstate solution to a first temperature, and then adding superfine ammonium paratungstate; s4, the ammonium tungstate solution is heated to a second temperature, heat preservation and continuous stirring are conducted, and ammonium paratungstate crystals are obtained; by adjusting parameters such as temperature, pH value, solvent type and concentration, optimizing crystallization conditions with metatungstate ions and ammonium paratungstate at the same time, improving the crystallization rate, and by controlling the degree of supersaturation of the solution, the situation that the crystallization rate is affected due to non-uniform crystal growth caused by too high crystallization rate is avoided, and the quality of the product is improved. The supersaturation degree can be controlled by adjusting parameters such as solution concentration and temperature.

The application belongs to the technical field of medicine, and particularly relates to a La2(WO4)3 / CuWO4 composite sonosensitizer, a preparation method thereof and application thereof in sonodynamic therapy. The La2(WO4)3 / CuWO4 composite sonosensitizer contains 5-40% of La2(WO4)3 in terms of mass percentage. The application takes U251 glioma cells as a model target, and explores the application of the La2(WO4)3 / CuWO4 composite sonosensitizer in sonodynamic therapy of tumors. The results show that the La2(WO4)3 / CuWO4 composite sonosensitizer has a good sonodynamic therapy effect on U251 glioma cell lines after 1MHz US irradiation for 1min.

The present invention refers to an antimicrobial composite material based on a semiconductor (WO3), a metal (Ag), and a carbon support. The present invention also relates to the procedure of its preparation from chitosan and soluble salts of Ag and W. The antimicrobial material can be used as a surface coating or additive in many different areas, such as automotive and construction industry.

The application discloses a SiO2-coated negative thermal expansion film and application thereof, and belongs to the technical field of temperature measurement. 12 :Nd 3+ The precursor solution is calcined to obtain the negative thermal expansion film, and then SiO2 solution is added dropwise on the negative thermal expansion film to obtain the SiO2-coated Yb2W3O 12 :Nd 3+ The SiO2-coated negative thermal expansion film is loaded on the opal template. 12 :Nd 3+ As a matrix, the SiO2 coating does not affect the luminescence of the negative thermal expansion film, and makes the Yb2W3O 12 :Nd 3+ The luminescence of the film in the near infrared is significantly enhanced. In addition, compared with the negative thermal expansion material film without the SiO2 coating, the negative thermal expansion material film is more sensitive to temperature.

The application discloses a transfer method of a two-dimensional material film, which comprises the following steps: coating photoresist on the surface of a two-dimensional material film directly grown on a growth substrate and solidifying the photoresist to form a transfer medium layer; separating the growth substrate from the transfer medium layer / two-dimensional material film; after the transfer medium layer / two-dimensional material film is attached to a target substrate, heating is performed to melt the transfer medium layer; and the transfer medium layer is removed. The transfer method of the application utilizes the characteristic that the photoresist can be softened at a low melting point after being solidified, and firstly solidifies the photoresist on the surface of the two-dimensional material film to be transferred to serve as a support medium for the transfer of the film, so that the transfer of the film is realized. After being transferred to the target substrate, the solidified photoresist can be softened, so that the transferred two-dimensional material film can be fully contacted with the target substrate, and the complete and intact transfer of the two-dimensional material film can be realized. The transfer method of the application is especially suitable for the transfer to a rough target substrate.

This disclosure provides systems and methods for purifying precursor compounds. One method includes one or more of the following steps: mixing a crude product solution with a first solvent, wherein the crude product solution comprises a precursor compound and at least one impurity; wherein the boiling point of the first solvent is higher than the boiling point of the crude product solution; feeding at least the mixture of the crude product solution and the first solvent into an evaporator; and collecting a distillate comprising the precursor compound from the evaporator, wherein the purity of the precursor compound in the distillate is greater than 95%, as determined by [further steps]. 1 Determined by H NMR. Other methods and systems are presented in this paper.

There is provided infrared absorbing composite fine particles whose surfaces are coated with a coating film containing one or more selected from a hydrolysis product of a metal chelate compound, a polymer of the hydrolysis product of the metal chelate compound, a hydrolysis product of a metal cyclic oligomer compound, and a polymer of the hydrolysis product of the metal cyclic oligomer compound, wherein a silicon compound is present in one or more locations selected from within the coating film, on the coating film, and the vicinity of surfaces of the infrared absorbing composite fine particles.

The present disclosure provides a capacitor which is advantageous from the perspective of capacitance and insulation breakdown electric field. This capacitor (1a) is provided with a first electrode (11), a second electrode (12), and a dielectric (20). The dielectric (20) is disposed between the first electrode (11) and the second electrode (12). The dielectric (20) contains a composite oxide. The composite oxide is composed of Cs, at least one element selected from the group consisting of Ti, Zr, and Hf, and W.

The invention discloses a width gradient tungsten disulfide nanobelt, a preparation method thereof and an application of the width gradient tungsten disulfide nanobelt in a self-driven photoelectric detector, a Ni film is deposited on a substrate and is annealed to form catalytic particles, and a chemical vapor deposition system is utilized to accurately control the temperature gradient between tungsten trioxide in a central temperature zone and a growth substrate in a downstream temperature zone, so that the width gradient tungsten disulfide nanobelt is obtained. And the solid sulfur source is propelled at a constant rate, the dynamic change of the sulfur / tungsten atomic ratio in the reaction environment is regulated and controlled, and a growth mode is guided to be converted from a gas-liquid-solid mechanism to a gas-solid mechanism, so that controllable preparation of the tungsten disulfide nanobelt with the width continuously and progressively decreased in the axial direction is realized. The width of the nanobelt gradually changes from 150-500 nm to 50-120 nm, the length of the nanobelt reaches 3-12 [mu] m, and the nanobelt has an armchair edge and a 3R phase stacking structure. A self-driven photoelectric detector constructed based on the nanobelt realizes high-sensitivity detection of 532 nm laser under zero bias voltage, the responsivity reaches 5.04 A / W, the detectivity reaches 3.23 * 10 < 12 > Jones, and the nanobelt shows important application value in the fields of optical signal detection, optical switches and wireless optical communication.

The application belongs to the technical field of metallurgy, and particularly relates to a preparation method of high-purity ammonium tungstate solution. The application provides a preparation method of high-purity ammonium tungstate solution, which comprises the following steps: performing first adsorption on a crude ammonium tungstate solution to obtain saturated adsorption resin; sequentially performing elution and desorption on the saturated adsorption resin to obtain tungsten-containing desorption solution; performing purification on the tungsten-containing desorption solution to obtain tungsten-containing purified solution; and performing second adsorption on the tungsten-containing purified solution to obtain the high-purity ammonium tungstate solution. Compared with the existing solvent extraction, the application adopts the chromatography column method to separate and purify tungsten, and the tungsten can be obtained through adsorption, elution, desorption, purification and secondary adsorption, so that the process flow is simple, and the reagent consumption is small. The experimental results show that the purity of the ammonium tungstate solution obtained by the application can reach more than 99.9995%.

The invention discloses a modified nickel cobalt lithium manganate positive electrode material which comprises a nickel cobalt lithium manganate positive electrode material matrix and a perovskite coating layer Li [mu] W [alpha] Sr [beta] O [gamma] coating the surface of the nickel cobalt lithium manganate positive electrode material matrix. The preparation method comprises the following steps: mixing a precursor containing nickel, cobalt and manganese elements, a lithium salt, a W-containing compound, a Sr-containing compound and an M-containing compound, carrying out first sintering treatment, crushing and dissociating, mixing with the lithium salt, carrying out second sintering treatment, and screening to obtain the modified nickel cobalt lithium manganate positive electrode material. The invention also discloses a lithium ion battery comprising the positive electrode material and an electric device. According to the invention, the surface of the nickel cobalt lithium manganate positive electrode material substrate is coated with the perovskite coating layer, so that the problems of internal resistance, rate capability and low power of a low-Co material can be improved; the high-temperature cycle capacity retention ratio of the material under high charging cut-off voltage can be improved; and the problems of high-temperature storage internal resistance increase and gas production of the material under high charging cut-off voltage can be improved.

A heat ray shielding film comprising a glass substrate, a first layer, and a second layer, wherein: the first layer contains at least one substance selected from tungsten oxides represented by general formula WO3-x (0≤x≤0.28), silicon oxynitrides represented by general formula SiOaNb, and aluminum oxide; the second layer contains tungsten bronze; and the layers are arranged in the order of the first layer and the second layer, with the first layer being closest to the glass substrate.

An infrared absorbing fiber including: a fiber; and organic-inorganic hybrid infrared absorbing particles, is provided. The organic-inorganic hybrid infrared absorbing particles include infrared absorbing particles and a coating resin that covers at least a part of a surface of the infrared absorbing particles. The organic-inorganic hybrid infrared absorbing particles are located in one or more parts selected from an interior of the fiber and a surface of the fiber.

The invention relates to the technical field of lithium ion batteries, and discloses a multi-element co-doped garnet solid electrolyte and a preparation method and application thereof.The solid electrolyte is a compound with the following chemical formula structure: (Li < 1 + alpha > A < 1m + t >) (La < 3 + 3-uD < 2 + u >) (Zr < 4 + x > Hf < 4 + y > Y < 3 + z > Ta < 5 + v > Mr + w) (O < 2-12-oEs-o), chemical valence balance is met, alpha is smaller than or equal to 6.8, y is smaller than or equal to 0.07, y is smaller than or equal to 0.07, and y is smaller than or equal to 0.07. V + w + x + y + z = 2, and the range among v, w, x and y does not exceed 50% of the maximum value. According to the multi-element co-doped garnet solid electrolyte provided by the invention, the ionic conductivity can be remarkably improved, the activation energy can be reduced, the air stability can be greatly improved, and the applicability is wide.

The invention discloses a p-type tungsten disulfide nanotube bundle, a preparation method thereof and application of the p-type tungsten disulfide nanotube bundle in a photoelectric detector with adjustable light response linearity, and the method comprises the following steps: depositing an Au film on a SiO2 / Si substrate, and carrying out annealing to form a zero-dimensional Au nanoparticle catalytic layer; the method comprises the following steps: respectively placing tungsten trioxide (WO3) powder and sulfur (S) powder in different areas of a single-temperature-area tubular furnace, heating to 850-1000 DEG C in an Ar / H2 mixed gas low-pressure atmosphere, and reacting to generate a WS2 nanotube bundle with a multi-wall hollow structure; the obtained material has a cluster-shaped morphology in dense interlaced distribution, and shows stable p-type conductive characteristics. A photoelectric detector prepared based on the material has high responsivity (2.7 * 10 < 4 > A / W), high detection rate (1.6 * 10 < 13 > Jones) and quick response (15 ms) in a wave band of 375-1550 nm, and keeps stable performance in a range of 10-300 K. The method is simple in process, the growth process of the tungsten disulfide nanotube bundle can be accurately controlled, the polarity of tungsten disulfide is changed to be p-type, and large-scale preparation can be achieved.

The application discloses a preparation method of a suspended two-dimensional material film and the suspended two-dimensional material film. The preparation method comprises the following steps: providing a substrate, wherein the substrate has a first surface and a second surface opposite to each other; forming a sacrificial layer film on the first surface of the substrate; forming a through hole on the second surface of the substrate, and the through hole exposes the sacrificial layer film; obtaining a two-dimensional material film, transferring the two-dimensional material film to the sacrificial layer film, and the two-dimensional material film covers the through hole; etching the sacrificial layer film from the second surface of the substrate until the two-dimensional material film is exposed, and a suspended two-dimensional material film is formed. The preparation method of the suspended two-dimensional material film and the suspended two-dimensional material film have the advantages that the two-dimensional material film has low transfer difficulty, the light source has little influence on the test, and the test means is effectively widened.

An argyrodite-type solid electrolyte, a preparation method therefor, and use thereof. The molecular formula of the argyrodite-type solid electrolyte is Li5.5-xP1-xWxS4.5-3xO3xClyBr1.5-y. During preparation, raw materials are premixed according to a molar ratio and subjected to ball milling to obtain a solid electrolyte powder; then, the solid electrolyte powder is pressed into an electrolyte sheet, which is sintered to obtain the argyrodite-type solid electrolyte. The multifunctional electrolyte exhibits good stability in air while improving ionic conductivity.

The present invention discloses a bimetallic sulfide heterojunction modified diaphragm, a preparation method thereof, and an application thereof. The technical solution comprises the following steps: synthesizing a bimetallic sulfide heterojunction material having a three-dimensional flower-like structure constructed by self-assembly of NiS2-WS2 heterojunction nanosheets by a one-step hydrothermal method; then preparing the bimetallic sulfide heterojunction material into a slurry and uniformly coating the slurry on one surface of a commercial polymer diaphragm, thereby finally obtaining a bimetallic sulfide heterojunction modified diaphragm and applying the slurry to a lithium-sulfur battery; the NiS2-WS2 heterojunction in the bimetallic sulfide heterojunction modified diaphragm can improve interfacial activity, increase surface catalytic active sites, optimize the adsorption capacity for polysulfides, and promote catalytic conversion, thereby effectively improving the rate performance and cycle stability of the lithium-sulfur battery.

To provide a method for producing composite tungsten oxide particles by which equipment with a low introduction cost can be used and the number of steps is small.SOLUTION: A method for producing composite tungsten oxide particles represented by the general formula MxWyOz (0.001≤x / y≤1, 2.2≤z / y≤3.0) is provided. The method for producing composite tungsten oxide particles comprises an aerosol forming step of forming an aerosol containing a mixed raw material powder of a W source raw material powder, which is a tungsten source, and an M source raw material powder, which is a source of an M element, which are objects to be treated, and a heat treatment step in which the aerosol is carried by a carrier gas while being heat-treated at a temperature of 1000°C or higher and 1350°C or lower, with the carrier gas being air.SELECTED DRAWING: Figure 1

The application discloses a flower ball-shaped bismuth disulfide / tungsten disulfide composite material and a preparation method and application thereof. Tungsten hexachloride is added into anhydrous ethanol solution and fully stirred, then bismuth nitrate pentahydrate is added into the mixed solution and stirred to uniformly disperse the bismuth nitrate pentahydrate into the solution, then thioacetamide is added and stirred to be uniform, the obtained solution is moved into a reaction kettle, and the reaction kettle is sealed and placed into a homogeneous reactor; after the reaction is completed, the product is taken out, washed and fully dried in a vacuum oven to obtain the composite material. The composite material has a thickness of 20-30 nm, and nanosheets are vertically grown on a self-assembled flower ball-shaped structure with a diameter of 350-400 nm; the composite material can be applied to preparation of a potassium ion battery negative electrode material, and the structure is more stable, the conductivity is better, and the electrochemical performance is greatly improved.

The invention belongs to the related field of tungsten materials, and discloses nano ammonium paratungstate and a preparation method thereof. The morphology of the nano ammonium paratungstate is in a spherical shape or a sphere-like shape, and the particle size of the nano ammonium paratungstate is 20-100 nm. The nanoscale ammonium paratungstate product provided by the invention has high specific surface area and excellent catalytic activity and thermal stability.