181results 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 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.

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.

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.

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.

The invention provides a preparation method and application of a precursor for laser synthesis of a MoS2 (WS2) film, and belongs to the technical field of semiconductor film materials.The preparation method comprises the following steps that S1, a container is placed in a water bath heating environment, deionized water, a molybdenum source or a tungsten source and a sulfur source are added, and a supersaturated solution is obtained after continuous stirring; and S2, in a water bath heating environment, adding a nonionic surfactant into the supersaturated solution, continuously stirring, and filtering after the nonionic surfactant and the supersaturated solution are fully mixed to obtain a precursor solution. Coating a substrate with the precursor solution, and drying the coated substrate; and irradiating the precursor solution coated on the substrate by using a laser beam to obtain the MoS2 (WS2) film. The process is simple and easy to implement, and rapid and low-cost preparation of the MoS2 (WS2) film can be realized.

The invention relates to the technical field of hard alloy powder preparation, and provides a material mixing device and method for improving tungsten carbide combined carbon, the material mixing device comprises a bin body structure, a shell and a bin cover form a closed mixing cavity, and the shell is provided with a temperature adjusting hollow interlayer; the mixing mechanism comprises a driving shaft and a helical ribbon with a triangular notch; the fly-cutter mechanism is located on the spiral ribbon throwing path and comprises a cutter shaft, a hinged cutter and an angle adjusting assembly. Through the synergistic effect of high-frequency shearing of the fly cutter and low-speed diffusion of the helical ribbon, and in cooperation with a sectional type cooling and mixing process, the problem of low combined carbon content caused by non-uniform mixing in the production of the superfine tungsten carbide is effectively solved, and high-uniformity mixing of the tungsten powder and the carbon black is realized.

The invention belongs to the technical field of recycling of rare and noble metal secondary resources, and discloses a method for preparing a tungsten compound and chloroplatinate from a waste catalyst and application of the method. The method comprises the following steps: (1) firing and crushing the waste catalyst, (2) reacting the waste catalyst with acid, (3) filtering and discarding filtrate, (4) reacting the precipitate with ammonia water, filtering to obtain an ammonium tungstate solution, and retaining filter residues; (5) concentrating the ammonium tungstate solution, crystallizing, separating and drying to obtain an ammonium paratungstate finished product; and (6) reacting the filter residues retained in the step (4) with aqua regia to prepare chloroplatinate. And (7) firing the ammonium paratungstate at a high temperature to obtain tungsten trioxide. According to the method, tungsten and platinum can be effectively separated from the carrier, and the recovery rate of rare and precious metals is increased.

This invention discloses a SnS / WS2@C composite electrode material, its preparation method, and its application, belonging to the field of tungsten disulfide nanomaterials technology. A precursor solution A is obtained by uniformly dispersing SnCl2·2H2O and CH3CSNH2 in anhydrous ethanol. After a solvothermal reaction, precursor solution A is cooled, centrifuged, washed, and freeze-dried to obtain powder B. Powder B, WCl6, and CH3CSNH2 are uniformly dispersed in anhydrous ethanol to obtain solution C. After a solvothermal reaction, solution C is cooled, centrifuged, washed, and freeze-dried to obtain powder D. Powder D is uniformly dispersed with glucose in deionized water to obtain precursor solution E. After a solvothermal reaction, precursor solution E is cooled, centrifuged, washed, and freeze-dried to obtain powder F. Powder F is calcined at high temperature to obtain the SnS / WS2@C composite electrode material. Performance testing of the prepared SnS / WS2@C composite electrode material revealed that it exhibits good electrochemical performance when used as a negative electrode in potassium-ion batteries.

Electromagnetic wave absorbing particles including cesium tungsten oxide represented by a general formula CsxW1-yO3-z (0.2≤x≤0.4, 0<y≤0.4, and 0<z≤0.46) and having an orthorhombic crystal structure or a hexagonal crystal structure are provided.

The invention discloses a preparation method of a nanoscale tungsten disulfide colloidal suspension, which belongs to the field of tungsten disulfide preparation, and comprises the following steps: step 1, adding tungsten disulfide powder into a solvent, and adding a surfactant or a stabilizer to obtain a mixed solution; step 2, carrying out tungsten disulfide interlayer stripping treatment on the mixed solution to generate a suspension containing nanosheets or nanoparticles with the transverse size of less than 100nm and the thickness of less than 5nm; 3, the suspension liquid obtained after ultrasonic treatment is subjected to centrifugal treatment, and supernate serves as preliminarily purified nanometer tungsten disulfide dispersion liquid; step 4, adjusting the pH value of the nano tungsten disulfide dispersion liquid to 7-8, and adding a polymer stabilizer to enable the absolute value of the Zeta potential of the system to be greater than 30mV; step 5, performing impurity removal and filtration on the suspension to remove residual micron-sized impurities; 6, the obtained filtrate is the prepared stable nanoscale tungsten disulfide colloidal suspension, and the stable nanoscale tungsten disulfide colloidal suspension is packaged into a preset container to be stored.

The invention provides a method for preparing calcium-based nano particles by a reversed-phase microemulsion method, an organic calcium salt nano material and application of the organic calcium salt nano material as a nano drug, and belongs to the field of biomedical nano materials. The calcium-based nanoparticles can be formed by reacting calcium dodecyl benzene sulfonate with ammonium salt of corresponding ions or a hydroxyl-containing organic matter aqueous solution; the preparation method of the calcium-based nanoparticles has certain universality, and nano-material drugs including calcium succinate, calcium hypophosphite, calcium gluconate, calcium formate, calcium citrate and the like are successfully synthesized. The synthesis method is simple, mild in reaction condition, environment-friendly, high in repeatability, capable of realizing batch preparation and low in raw material cost. When the calcium salt nano-drug such as calcium succinate enters tumor cells through endocytosis, a large number of ions are brought into the cells, and suddenly excessive ions can cause osmotic pressure and homeostasis imbalance in the cells, activate a pyroptosis pathway of the cells and induce death of immunogenic cells.

To provide a new transition metal-doped tungsten molybdic acid doped with one or more transition elements.SOLUTION: In the transition metal-doped tungsten molybdate, a compound represented by MoxW1 - xO3 - nH2O (0 ≤ x ≤ 1, 0 ≤ n) is doped with one or more elements selected from the group consisting of transition elements (excluding Mo and W).SELECTED DRAWING: Figure 1

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 [M][Nb]y[O]z; wherein the active electrode material is oxygen deficient; wherein M consists of one of Mg, Cr, W, Mo, Cu, Ga, Ge, Ca, K, Ni, Co, Al, Sn, Mn, Ce, Sb, Y, La, Hf, Ta, Zn, In, or Cd; y satisfies 0.5≤y≤49; and z satisfies 4≤z≤124.

The invention belongs to the technical field of polymer catalysis, and discloses a MeOH-difunctional zirconium-based heteropolyacid catalytic system as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, preparing a sodium tungstate aqueous solution and a sodium metasilicate aqueous solution, adding a hydrochloric acid solution and the sodium metasilicate aqueous solution into the sodium tungstate aqueous solution, adjusting the pH value, standing, and adding potassium chloride to obtain SiW-1; s2, dissolving SiW-1 in deionized water, adjusting the pH value, standing, and adding potassium chloride to obtain SiW; and S3, dissolving SiW in deionized water, adjusting the pH value, adding a zirconium oxychloride aqueous solution, adjusting the pH value again, adding cesium chloride, stirring, carrying out suction filtration, collecting precipitate, grinding into powder, and adding the powder into MeOH to obtain the heteropolyacid catalytic system. The heteropolyacid catalytic system disclosed by the invention is excellent in catalytic effect, simple and convenient to prepare and capable of being recycled.

The present invention provides a process for preparing tungsten (VI) salts hydrates, the process comprising (a) Preparing a tungsten (VI) salt in an alkaline aqueous solution; (b) Filtering the aqueous solution at a temperature at which the tungsten (VI) salt remains dissolved; (c) Precipitating the tungsten (VI) salt hydrate from the filtrate resulting from step (b); (d) Filtering; (e) Washing the resulting filter cake with a water-miscible solvent; and (f) Drying the washed cake under conditions that allow the removal of the water-miscible solvent. The resulting salts show a level of impurities and solvents so low that they are suitable in the fields of pharmacy, veterinary and dietary.

The present disclosure broadly relates to a high temperature chemical process for the synthesis of cesium tungstate in the solid state and the preparation of aqueous solutions or deuterated solutions of cesium tungstate. More specifically, but not exclusively, the present disclosure relates to a high temperature chemical process in which tungsten oxide compounds such as tungsten oxides, or natural or synthetic concentrates such as wolframite or scheelite, tungsten industrial by-products or there mixture thereof, are mixed with cesium compounds such as cesium carbonate, or cesium sulfate, or cesium hydroxide or their mixtures thereof and the mixture is roasted in air or oxygen at high temperature inside a kiln. After cooling, the solid sintered mass containing cesium tungstate is leached or dissolved with water or heavy water for producing dense aqueous solutions or deuterated solutions of cesium tungstate.

The invention discloses a carbon dot-polyacid ratio fluorescent probe for simultaneously detecting Pb < 2 + > and Cr < 6 + > and application of the carbon dot-polyacid ratio fluorescent probe. The polyacid composite carbon dot ratio fluorescent probe for detecting Pb < 2 + > and Cr < 6 + > ions in an environment is obtained by taking herba houttuyniae as a carbon source, L-cysteine as a doping agent and sodium decatungsten europium acid EuW10 as a modifier through direct one-pot hydrothermal treatment. The probe can be used for accurate analysis and detection of Pb < 2 + > and Cr < 6 + > ions in the environment, the detection limit of Pb < 2 + > can be as low as 3.4 nM, the detection limit of Cr < 6 + > can be as low as 14.78 nM, and the probe has high selectivity and anti-interference capability on the Pb < 2 + > and Cr < 6 + > ions, is obvious in color change, and can be simultaneously used for detection of three scenes in which the Pb < 2 + > and Cr < 6 + > ions independently exist or coexist at the same time in the environment. The method has the advantages of real-time, in-situ, visual and rapid detection, and is simple in synthesis method, environment-friendly, low in cost, easy to carry and good in detection effect.