272results about "Tungsten oxides/hydroxides" patented technology

The invention provides anti-ionizing radiation powder with a core-shell heterogeneous gradient structure and a preparation method and application of the anti-ionizing radiation powder, and belongs to the field of radiation protection.The preparation method of the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure comprises the following steps that high-atomic-number metal salt is added into deionized water, aging, washing, drying and primary calcination are conducted in sequence, and the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure is obtained; a core layer is obtained; the core layer and low-atomic-number metal salt are added into deionized water, aging, washing, drying and primary calcination are sequentially conducted, and preliminary wrapping powder with the high-atomic-number metal core layer wrapped by low-atomic-number metal is obtained; and adding the preliminarily wrapped powder and rare earth salt into deionized water, and sequentially performing aging, washing, drying, primary calcining, secondary calcining, airflow crushing and air rotation purging to obtain the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure. Through cooperation of the core-shell heterostructure, the high-atomic-number oxide, the low-atomic-number oxide and the multi-element rare earth element, the shielding performance of the material is remarkably improved.

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 lithium manganese iron phosphate positive electrode material and a preparation method thereof, a lithium ion battery and electric equipment, and relates to the technical field of new energy. According to the lithium manganese iron phosphate positive electrode material provided by the invention, the amorphous precursor and the high-crystallization precursor are used as raw materials, and the high-crystallization precursor causes a relatively high specific surface area of the material and affects the processability; the amorphous precursor can improve the compaction density and the specific surface area of the material, and the capacity and the cycle performance of the lithium manganese iron phosphate positive electrode material are ensured by combined use of the two precursors. The combination of elements with different valence states is used, so that the doping and coating effects are achieved at the same time, and the performance of the material is synergistically improved; elements with relatively low valence states are easily doped in a lithium manganese iron phosphate crystal structure, so that the capacity of the material is improved; and elements with relatively high valence states are distributed on the surfaces of lithium manganese iron phosphate particles, so that the stability of the surface structure of the material is improved.

The invention relates to the technical field of positive electrode materials, in particular to a preparation method of a cerium-tungsten composite modified core-shell lithium-rich manganese-based positive electrode material, which comprises the following steps: mixing a quaternary manganese-rich precursor and a lithium salt, sintering at a high temperature, cooling, crushing and sieving to obtain a primary sintered matrix; the method comprises the following steps: mixing a sintering matrix with a coating agent, sintering and modifying, and cooling, sieving and demagnetizing to obtain the cerium-tungsten composite modified core-shell lithium-rich manganese-based positive electrode material, the quaternary manganese-rich precursor is of a core-shell structure and is selected from at least one of a manganese-nickel-cobalt-aluminum quaternary precursor, a manganese-nickel-cobalt-tungsten quaternary precursor, a manganese-nickel-cobalt-zirconium quaternary precursor, a manganese-nickel-cobalt-magnesium quaternary precursor and a manganese-nickel-cobalt-titanium quaternary precursor; by adopting the quaternary manganese-rich precursor and adding the coating agent to the primary sintering matrix for modification, the obtained positive electrode material has obviously improved first charge-discharge specific capacity and rate capability, and the preparation process is simple and easy to popularize and implement.

The invention provides a lithium ion battery positive electrode material and a preparation method and application thereof. According to the lithium ion battery positive electrode material, the lithium ion battery positive electrode material has a core-shell structure, a lithium layered metal oxide, a composite double-phase coating layer and a carbon coating layer are distributed from the center to the surface of the lithium ion battery positive electrode material, and the composite double-phase coating layer is prepared from a fast ion conductor and an oxide. The lithium ion battery positive electrode material provided by the invention solves the problems of limited rate capability and poor cycling stability of a ternary material, improves the capacity retention ratio of a lithium ion battery under high-power charging and discharging conditions, inhibits interface side reaction between an electrode material and an electrolyte, and prolongs the service life of the battery. The invention also provides a preparation method and application of the lithium ion battery positive electrode material.

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.

The invention discloses a preparation method of low-oxygen-index surface needle-shaped high-specific-surface blue tungsten, which comprises the following steps: by taking ammonium paratungstate as a raw material, putting the raw material into a mechanically-sealed rotary calcining furnace with the furnace tube inner diameter of 400mm, and calcining at the calcining temperature of 580-620 DEG C in a first zone, 600-660 DEG C in a second zone and 600-640 DEG C in a third zone for 1-3 hours; the feeding frequency is 13-19 Hz, the furnace rotation frequency is 25-35 Hz, the negative pressure in the furnace is-400 + / -200 mm water column, the nitrogen flow is 0-4 M < 3 > / h, the low-oxygen-index surface-needle-shaped high-specific-surface blue tungsten is prepared, the oxygen index is 2.90-2.94, the surface of the low-oxygen-index surface-needle-shaped high-specific-surface blue tungsten is full of fine needle-shaped morphology, the specific surface area reaches 10-14 m < 2 > / g, and the low-oxygen-index surface-needle-shaped high-specific-surface blue tungsten can be used for preparing the high-specific-surface blue tungsten. The method is suitable for producing high-quality fine, superfine and nano-particle tungsten powder, tungsten carbide powder and corresponding hard alloy products.

The invention relates to the technical field of battery positive electrode materials, discloses a manganese-based battery positive electrode material precursor as well as a preparation method and application thereof, and belongs to the technical field of battery preparation. According to the technology for preparing the manganese-based battery positive electrode material precursor, a solid-phase method is mainly adopted, a high-temperature melting technology is adopted, the manganese-based positive electrode material is subjected to doping modification through multiple elements at the same time, then surface coating is carried out, the density of the synthesized positive electrode material is improved, the structural stability of the synthesized positive electrode material is enhanced, and the morphology, the crystal face and the crystal boundary of the positive electrode material are optimized; the side reaction between the crystal interface of the positive electrode material and electrolyte is inhibited, the service life is prolonged, and the safety performance during use is enhanced. A small amount of water vapor and carbon dioxide gas generated in the preparation process are discharged at high altitude, so that the environment is not polluted.

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 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 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.

The invention discloses a preparation method and application of an S-type heterostructure material with a plasma resonance effect, and the preparation method comprises the following steps: grinding a precursor material, calcining, collecting solid powder, carrying out reflux purification in deionized water, and collecting white powder; dispersing the white powder in a hydrazine hydrate solution, carrying out solvothermal reaction to obtain a faint yellow solution, repeatedly dissolving and precipitating by respectively using acidic and alkaline reagents, washing and drying to obtain a faint yellow solid product; uniformly grinding the faint yellow solid product, calcining the faint yellow solid product in an atmosphere furnace, and cooling to obtain orange solid powder; and adding the orange solid powder into an organic solvent of a precursor containing a tungsten source, and centrifuging, washing and drying after the solvothermal reaction is finished to obtain the S-type heterostructure material with the plasma resonance effect. The S-type heterostructure material with the plasma resonance effect has relatively high efficiency for simulating separation and removal of uranium species in post-treatment wastewater and shows relatively good anti-radiation stability.

Complexes of polyoxometalate (POM) cluster anions and metal oxide nanocrystal (NC) cores (POM-NC) with tunable NC surface protonation are disclosed. These protonated POM-NC complexes enable precise control over catalytic properties, enhancing catalytic activity under near-neutral pH conditions while improving stability and solubility across various applications. The protonated POM- metal oxide complexes facilitate the activation of airborne O2 under ambient conditions and the production of reactive oxygen species (ROS), including hydroxyl radicals, superoxide, and peroxides. In certain catalytic processes, these complexes mimic enzymatic functions, such as oxidase, peroxidase, catalase, and superoxide dismutase activity, making them valuable for various biological, therapeutic, chemical and environmental applications such as applications related to oxidative catalysis and ROS scavenging.

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.

An infrared absorbing material fine particle dispersion liquid including infrared absorbing material fine particles and a solvent, the infrared absorbing material fine particles containing fine particles of composite tungsten oxide represented by a general formula MxWOy, the solvent containing water, wherein an absolute value of a zeta potential of the infrared absorbing material fine particle dispersion liquid is 5 mV or more and 100 mV or less.

The invention relates to a preparation method and application of narrow-band-gap W18O49-X nano brush Schottky junction antibacterial nanoparticles based on near-infrared light response. In order to solve the problems of low phototoxicity and low tissue penetrability caused by weak absorption of an existing W18O49-X near-infrared (NIR) region, the invention provides a preparation method and application of narrow-band-gap W18O49-X nano-brush Schottky junction antibacterial nanoparticles based on near-infrared light response, the nanoparticles have good antibacterial performance and biocompatibility, the preparation process is simple, the preparation cost is low, and the preparation method is suitable for industrial production. The W18O49-X coated Au Schottky junction is constructed by uniformly growing Au nanoparticles on the W18O49-X nano brush through in-situ reduction, so that the photothermal conversion efficiency is improved, and the generation of active oxygen is increased. The antibacterial rate of staphylococcus aureus and the antibacterial rate of escherichia coli reach 99% or above, the PTT and PDT synergistic antibacterial method can effectively avoid drug resistance of bacteria, and the mild photo-thermal effect can promote differentiation, proliferation and migration of cells and accelerate revascularization.

The invention relates to a method for collaborative resource utilization of silver and tungsten in a waste silver tungsten carbide electric contact material, and belongs to the technical field of resource recycling. The method comprises the following steps: soaking the waste silver tungsten carbide electric contact material in an ethanol solution for pretreatment; the method comprises the following steps: putting a pretreated waste silver tungsten carbide electric contact material into a titanium frame as an anode, taking a stainless steel plate as a cathode, and taking a silver nitrate-nitric acid solution as an electrolyte, and carrying out direct-current electrolysis to obtain silver powder from the cathode and primary tungsten carbide from anode mud; the primary tungsten carbide is leached through a nitric acid solution, leached residues and leached liquid are obtained, the leached residues are tungsten carbide, and the leached liquid can serve as electrolyte to be returned to the electrolysis step; the method comprises the following steps: adding an additive into tungsten carbide, carrying out hydraulic cyclone classification to obtain underflow liquid and upflow liquid, carrying out solid-liquid separation on the upflow liquid to obtain particles, namely a hard alloy raw material, and carrying out solid-liquid separation on the underflow liquid to obtain a raw material for preparing tungsten oxide; and roasting the prepared tungsten oxide raw material in an oxygen-enriched atmosphere to obtain a tungsten oxide product.

There is provided an interlayer film for laminated glass with which a low yellow index value, low excitation purity and high heat shielding properties can be achieved in spite of the thickness varying with places. The interlayer film for laminated glass according to the present invention has a thickness of one end thinner than a thickness of the other end at the opposite side of the one end and includes a thermoplastic resin, an ultraviolet ray screening agent and tungsten oxide particles, and the ultraviolet ray screening agent is a benzotriazole-based ultraviolet ray screening agent.

The invention relates to a method for preparing a rapid hydrochromic mesoporous tungsten oxide film based on a plasma etching technology. The preparation method comprises the following steps: mixing an amphoteric block copolymer template agent with a tungsten source precursor, and coating the surface of a substrate with obtained sol to construct an organic-inorganic hybrid film; then introducing oxygen-containing plasma to etch the hybrid film; and finally loading a catalyst layer on the surface of the film. By utilizing the synergistic effect of high-energy active particles and active oxygen species in the plasma, through coupling of physical bombardment and chemical oxidation / volatilization reaction, the rapid removal of the organic template is realized under a low-temperature condition, meanwhile, the structural integrity of a mesoporous skeleton is kept, and the pore collapse and the specific surface area loss caused by traditional high-temperature calcination are avoided. The obtained mesoporous WO3 thin film has a high specific surface area and abundant surface active sites, and hydrogen diffusion and interface reaction kinetics can be effectively improved, so that the coloring / fading response is remarkably accelerated, and the hydrogen-induced discoloration performance is improved.

A method for preparing a two-dimensional porous oxide belongs to the technical field of porous oxide preparation. The method includes the following steps: (1) using a metal salt as a precursor, an ion-intercalated two-dimensional oxide is prepared by a molten salt method; (2) the ion-intercalated two-dimensional oxide is mixed with a lithium initiator, reacted for a predetermined time, and then the unreacted lithium initiator is removed, filtered, and washed to obtain the two-dimensional porous oxide. The two-dimensional porous oxide prepared by this method forms uniform pores with a pore size range of 2-10 nm and a specific surface area of ​​200-300 m². 2 / g.

The application discloses a waste WC and W powder segmented temperature control oxygen-enriched deep oxidation process and belongs to the technical field of oxidation processes.The process comprises the following steps: first, raw material pretreatment; second, segmented oxygen-enriched oxidation; the pretreated powder is continuously fed into a segmented temperature control oxidation furnace; third, product collection; and fourth, tail gas purification; the tail gas generated in the segmented oxygen-enriched oxidation process is treated by a three-stage purification system including water washing, alkali absorption and activated carbon adsorption and then discharged. The segmented temperature control oxidation mode is adopted to divide the oxidation process into a low-temperature pretreatment section, a medium-temperature pre-oxidation section, a high-temperature deep oxidation section and a cooling and stabilizing section, and the parameters such as the temperature, oxygen-enriched concentration and residence time of each section are accurately matched to gradually promote the oxidation reaction of WC and W. In combination with a specific proportion of oxidation accelerators, the oxidation activation energy is effectively reduced, the deep oxidation of the waste WC and W powder is realized, no unoxidized WC and W residues are detected by XRD, and the problem of insufficient oxidation in the prior art is solved.

The present invention provides a lithium supplement intermediate and its preparation method and application. The chemical formula of the lithium supplement intermediate is Li 5+ x FeO 4‑(m / 2) ·(OH) m , wherein 1.95≤m≤3.27, 0.05≤x≤0.55. The lithium supplement agent intermediate provided by the present invention includes an appropriate amount of hydroxide. When preparing the lithium supplement agent using this intermediate, the generation of water vapor during the subsequent sintering process can be regulated and the uniformity of the material reaction can be optimized, thereby obtaining a lithium supplement agent with uniform material and high phase purity.

The invention discloses a low-energy-consumption solid fuel cell type oxygen sensor and a preparation method thereof. The low-energy-consumption solid fuel cell type oxygen sensor comprises a membrane electrode component, and the membrane electrode component comprises a first conductive substrate, an anode catalyst layer, a solid electrolyte layer, a cathode catalyst layer and a second conductive substrate which are sequentially stacked. The solid electrolyte layer is used for separating the anode catalyst layer and the cathode catalyst layer and conducting protons, a preparation material of the anode catalyst layer and a preparation material of the cathode catalyst layer respectively comprise carrier materials loaded with catalytic metal particles, and the anode catalyst layer is used for carrying out oxidation reaction; and the cathode catalyst layer is used for oxygen to generate electrochemical reduction reaction. The low-energy-consumption solid-state fuel cell type oxygen sensor is free of an external power supply, all-solid-state, long in service life and high in stability.

The invention discloses a method for realizing degradation of polyalkylene oxide compounds and controllable molecular weight through a promoter, which comprises the following steps: adding a photodegradation promoter into a high-molecular-weight polyalkylene oxide product, adjusting the proportion of the promoter and the proportion of effective components, and accurately controlling the shear molecular weight under the irradiation of an ozone emitter, so that the molecular weight of the polyalkylene oxide compounds is controllable. According to the invention, polyalkylene oxide with different molecular weights of 30,000-3,000,000 is prepared by using the photodegradation cocatalyst, so that the photodegradation cocatalyst can meet the requirements of customers in different fields, and meanwhile, the photodegradation cocatalyst prepared by the invention can be recycled to achieve the benefits of reducing cost and improving efficiency.

The application provides a core-shell heterogeneous gradient structure anti-ionizing radiation powder and a preparation method and application thereof, and belongs to the field of radiation protection. The preparation method of the core-shell heterogeneous gradient structure anti-ionizing radiation powder comprises the following steps: adding a high-atomic-number metal salt into deionized water, sequentially performing aging, washing, drying and primary calcination to obtain a core layer; adding the core layer and a low-atomic-number metal salt into deionized water, sequentially performing aging, washing, drying and primary calcination to obtain a preliminary wrapped powder in which a low-atomic-number metal wraps a high-atomic-number metal core layer; adding the preliminary wrapped powder and a rare earth salt into deionized water, sequentially performing aging, washing, drying, primary calcination, secondary calcination, airflow pulverization and air rotation blowing to obtain the core-shell heterogeneous gradient structure anti-ionizing radiation powder. Through the synergy of the core-shell heterogeneous structure, high-atomic-number and low-atomic-number oxides and multiple rare earth elements, the shielding performance of the material is significantly improved.