511results 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 invention belongs to the technical field of photocatalytic materials, and particularly relates to a manganese ferrite / bismuth tungstate heterojunction photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: 1) dissolving sodium tungstate dihydrate, bismuth nitrate pentahydrate and hexadecyl trimethyl ammonium bromide in deionized water, and obtaining bismuth tungstate by using a hydrothermal method; 2) dissolving ferric chloride hexahydrate and manganese chloride tetrahydrate in water, then adding a sodium hydroxide solution, and obtaining manganese ferrite by using a hydrothermal method; and 3) dissolving bismuth tungstate and manganese ferrite into a sodium hydroxide solution, stirring, and drying to obtain the manganese ferrite / bismuth tungstate heterojunction photocatalyst. The formation of the heterojunction can greatly improve the activity of the manganese ferrite / bismuth tungstate in photocatalytic reduction of carbon dioxide.

The invention relates to the technical field of new energy materials, in particular to a thermoelectric composite material and a preparation method and application thereof.The thermoelectric composite material comprises 2D TMDs, a P-type semiconductor polymer and a conductive polymer, the P-type semiconductor polymer and the conductive polymer are cross-linked to form a composite conductive polymer, and the 2D TMDs are dispersed in the composite conductive polymer. The composite conductive polymer has the effects of forming a thermoelectric loop, regulating and modifying the interface of the 2D TMDs and protecting the 2D TMDs dispersed in the composite conductive polymer, and the 2D TMDs and the P-type semiconductor polymer convert heat energy into electric energy under the Seebeck effect. The thermoelectric building material additive comprises a thermoelectric composite material combined on an inorganic silica gel carrier. The thermoelectric cement-based material comprises cement and a thermoelectric building material additive. The thermoelectric cement-based material has good thermoelectric performance, stability and durability, and is suitable for scenes with obvious temperature difference or urgent energy recovery requirements.

The invention belongs to the technical field of tungsten metallurgy, and particularly relates to a method for reducing the water content of tungstic acid, which comprises the following steps: S1, heating a container filled with a sodium tungstate solution in a water bath kettle, stirring the sodium tungstate solution, and adding ethanol; s2, adding hydrochloric acid into the sodium tungstate solution added with the ethanol, adjusting the pH value of the solution, monitoring in real time in the reaction process to ensure that the pH value of the solution is stable, stopping heating to naturally cool the solution to an aging temperature for constant-temperature aging, and then filtering and washing; and S3, drying to obtain tungstic acid. The water content of the tungstic acid obtained after filtering and washing is less than or equal to 30wt%.

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.

The invention discloses a treatment method of an ammonium paratungstate sieve head material. The treatment method comprises the following steps: S1, preparing a solution; step S2, dissolving; s3, filtering and washing; step S4, drying and screening; according to the process disclosed by the invention, the ammonium paratungstate sieve head material is adjusted and treated, the consumption of auxiliary materials is reduced, the energy consumption is low, and the open crystal appearance of the original ammonium paratungstate crystal is kept; compared with the original undersize ammonium paratungstate product, the ammonium paratungstate product recovered and treated by the method has the advantages that the impurity element content is lower, the total impurity content is 20-30ppm lower than that before treatment, and the product quality is integrally improved.

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 relates to active electrode materials and to methods for the manufacture of active electrode materials. Such materials are of interest as active electrode materials in lithium-ion or sodium-ion batteries. The invention provides an active electrode material expressed by the general formula [M1]x[M2](1−x)[Nb]y[O]z, wherein: M1 and M2 are different; M1 represents one or more of Ti, Mg, V, Cr, W, Zr, Mo, Cu, Fe, Ga, Ge, Ca, K, Ni, Co, Al, Sn, Mn, Ce, Te, Se, Si, Sb, Y, La, Hf, Ta, Re, Zn, In, or Cd; M2 represents one or more of Mg, V, Cr, W, Zr, Mo, Cu, Ga, Ge, Ca, K, Ni, Co, Al, Sn, Mn, Ce, Sb, Y, La, Hf, Ta, Zn, In, or Cd; and wherein x satisfies 0<x<0.5; y satisfies 0.5≤y≤49 z satisfies 4≤z≤124.

The invention provides submicron high-purity tungsten powder and a preparation method thereof, and relates to the field of tungsten powder preparation. Ammonium paratungstate and ammonia water are mixed to obtain a mixture, the mixture is subjected to ammonia dissolving treatment, and a first ammonium tungstate solution is obtained through filtering; carrying out first ion exchange on the first ammonium tungstate solution by adopting strong acid cation exchange resin to obtain a first ion-exchanged solution; carrying out second ion exchange on the solution subjected to the first ion exchange by adopting chelating resin to obtain a high-purity ammonium tungstate solution; the high-purity ammonium tungstate solution is subjected to vacuum spraying and freeze drying, and a submicron tungsten precursor is obtained; and carrying out hydrogen reduction reaction on the submicron tungsten precursor to obtain the submicron high-purity tungsten powder. Insoluble particles and metal cation impurities in the solution can be effectively removed, and the high-purity tungsten precursor solution is obtained; raw materials are easy to obtain, and operation is simple.

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 present invention discloses a solid-liquid separation device for producing sodium tungstate solution, which relates to the technical field of separation and includes a separation box, wherein the separation box is connected to a material pipe symmetrically distributed along the transverse direction of the separation box, the separation box is fixedly connected to two fixed frames on one side close to the material pipe, the separation box is fixedly connected to a motor symmetrically distributed along the longitudinal direction of the separation box, the separation box is rotatably connected to a screw symmetrically distributed along the longitudinal direction of the separation box, the screw is fixedly connected to the adjacent motor, a push plate is threadedly connected between the symmetrically distributed screws, the push plate is slidably connected to the separation box, and the fixed frame is horizontally slidably connected to a closing plate. The present invention, through the arrangement of components such as the motor, the screw, the push plate, and the closing plate, can discharge solid precipitates in the subsequent discharge process of the precipitate without pausing the flow in and out of the sodium tungstate solution.

The invention discloses a method for efficiently recycling residual alkali in tungsten ore decomposition liquid. The method comprises the following steps: step S1, evaporation and concentration; step S2, salting-out crystallization; s3, cooling, filtering and separating; the solution obtained after tungsten ore is decomposed and filtered in the step S1 is transferred into a multi-effect evaporator to be evaporated and concentrated, solid sodium hydroxide is supplemented to be dissolved to generate heat in the step S2 to be evaporated, meanwhile, sodium tungstate crystals are separated out through a salting-out crystallization method, the defect that the steam consumption of a direct evaporation crystallization method is large is overcome, and the yield of the product is improved. The direct recovery rate of sodium tungstate and sodium hydroxide is greatly improved, the production cost is saved, and the economic benefits of enterprises are increased; in the step S3, the sodium hydroxide mother liquor is returned to the tungsten ore decomposition procedure, sodium hydroxide is recycled through alkali concentration, salting-out and crystallization, the use amount of the auxiliary material solid sodium hydroxide is greatly reduced, the use amount of environment-friendly neutralization added acid is reduced, the salt content in production wastewater is reduced, and economic benefits are increased.

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 invention discloses a transfer method for a heterogeneous double-layer structure of a suspended two-dimensional material, and belongs to the technical field of two-dimensional material transfer. The invention provides a method for transferring a two-dimensional material to a porous substrate by using PDMS and preparing a heterogeneous double-layer structure of a suspended two-dimensional material. The two-dimensional material is transferred to the hole substrate in sequence, the suspended two-dimensional material heterogeneous double-layer structure can be obtained, no solution needs to be used in the process, and pollution to the two-dimensional material is avoided. In the transfer process, the PDMS is adsorbed through electrostatic force between the slide and the PDMS, and the PDMS is lifted from one side to be separated from the substrate, so that the stress of the PDMS on the suspension part of the two-dimensional material in the transfer process can be remarkably reduced, and the transfer success rate is greatly improved. Compared with an existing transfer method, the transfer method does not need additional experimental instruments, and is simple to operate and high in success rate.

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 present invention relates to a process for producing dipentaerythritol from pentaerythritol in the presence of sulfolane and a heterogeneous polyacid catalyst supported on a carrier comprising a compound selected from the group consisting of: SnO2, mesoporous silica, and zeolite.

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.

To provide antibacterial materials having stability as inorganic substances and methods for producing the antibacterial materials.SOLUTION: Provided is an antibacterial material containing composite tungsten oxide fine particles, represented by a general formula MxWyOz.SELECTED DRAWING: Figure 1

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%.