52 results about "Ultrasonic spray pyrolysis" patented technology

The invention disclosed relates to porous carbon of spherical morphology having tuned porosity and to a method of making same, comprising: (a) providing a precursor solution, by combining in an aqueous solution a colloidal silica template material and a water-soluble pyrolyzable carbon source, wherein the particle size of the colloidal silica template and the colloidal silica/carbon source weight ratio are controlled, (b) atomizing the precursor solution into small droplets by ultrasonic spray pyrolysis (c) directing the droplets into a high temperature furnace operating at a temperature of 700-1200° C., under an inert gas atmosphere, where the droplets are transformed into solid spherical composite carbon/silica particles, (d) collecting the resulting composite carbon/silica particles exiting from the furnace, and (e) removing the silica from the particles, to provide substantially pure porous carbon of spherical morphology having tuned porosity defined by surface area and pore size. The porous carbon according to the invention is used as catalyst supports in PEM fuel cells, as electrodes in supercapacitors and lithium in batteries, for hydrogen storage and as earners for drug delivering.

The invention discloses a hydrothermal preparation method for NiS2 with a controllable shape, and the method mainly comprises the following steps of: mixing nickel salt, a sulphur source and a complexing agent in a certain molar ratio, transferring the mixture into a high-pressure reactor, adding distilled water, and stirring to adequately dissolve soluble solids; adjusting the pH value of the reaction system, sealing the reactor, and reacting at a certain temperature; and washing the obtained product by use of distilled water and ethanol respectively, centrifugally separating, and drying. The hydrothermal preparation method for NiS2 with a controllable shape disclosed by the invention has the advantages of being simple in operation by using a hydrothermal method, moderate in reaction condition, narrow in particle size distribution, high in product purity, easy in industrial production, and the like. The particle shape and size of NiS2 can be controlled by adjusting the synthesis conditions such as hydrothermal reaction temperature, reaction time, complexing agent type and pH value, and the prepared NiS2 can be approximately-cube-shaped, spherical, sheet-shaped and the like. Compared with a solid-state reaction method, an ultrasonic spray pyrolysis method, a gamma-ray irradiation method and an organic solvent hot method, the NiS2 prepared by the hydrothermal method has the advantages of being low in reaction temperature and equipment demand, less in toxicity on a human body, high in safety factor, low in production cost, capable of meeting the requirements of energy conservation and emission reduction, and the like.

The invention relates to a method for extracting tungsten and molybdenum through acid decomposition of high-molybdenum scheelite. The method comprises the following steps: leaching the high-molybdenumscheelite with an acid solution, and extracting a leachate to extract molybdenum; extracting a leaching residue with hydrogen peroxide to obtain a solution containing peroxotungstic acid and peroxymolybdic acid, and heating or introducing SO2 to obtain tungstic acid and a solution containing the peroxomolybdic acid; extracting the tungstic acid with hydrogen peroxide, and heating or introducing SO2 to obtain tungstic acid and a solution containing the peroxomolybdic acid; repeating for several times till pure tungstic acid is obtained; preparing tungsten trioxide or tungsten powder from the pure tungstic acid; and heating or introducing SO2 into the solution containing the peroxomolybdic acid, dissolving obtained molybdic acid in a hydrogen peroxide solution to prepare a peroxomolybdic acid solution, and performing ultrasonic spraying pyrolysis to prepare molybdenum trioxide powder or molybdenum powder. By the method, the separation effect is good and the operation process is simple and easy to control, so that the method is easy to popularize and apply industrially.

The invention discloses a preparation method for a p-CuAlO2/n-ZnO:Al transparent thin film heterojunction of a glass substrate. The preparation method comprises the following steps of: (1) preparing a p-CAO transparent conductive thin film by adopting a Sol-Gel process and preparing an n-AZO transparent conductive thin film by adopting an ultrasound spray pyrolysis (USP) process; (2) performing glue averaging, layering and preheating for many times during preparation of the p-CAO thin film; (3) annealing the p-CAO thin film under an argon environment; (4) depositing the n-AZO transparent conductive thin film on the substrate covered with the CAO thin film by adopting the USP process; and (5) heating the substrate during deposition of the n-AZO transparent conductive thin film, making the temperature of the substrate not more than 320 DEG C and naturally cooling the sample to obtain the p-CuAlO2/n-ZnO:Al(p-CAO/N-AZO) transparent thin film heterojunction. The method is novel and simple and the requirement of a large-area film forming process can be met; furthermore, the prepared p-CAO/n-AZO heterojunction has a fully transparent structure, can realize a p-n node function and has high photoelectric performance.

The invention relates to a method of producing a tungsten product from a crude sodium tungstate solution. The method includes steps of: adding a proper amount of acid to the crude sodium tungstate solution to generate precipitate, and filtering the solution to obtain crude tungstic acid and a filtrate; recycling tungsten from the filtrate through a weak-alkaline anion exchange resin or with an extraction agent; extracting the crude tungstic acid with H2O2, and heating a peroxytungstic acid solution or feeding SO2 to prepare tungstic acid; repeating the step for several times until preparing pure tungstic acid; preparing WO3 or tungsten powder from the pure tungstic acid; dissolving the tungstic acid in H2O2 solution to obtain the peroxytungstic acid solution; and performing ultrasonic spray pyrolysis to obtain tungsten oxide powder or tungsten powder. The method has great separation effect, is simple and controllable in operation process, and is easy to promote and apply in industry.

The invention discloses an integrative ultrasonic spray pyrolysis large-area wide-temperature zone coating device, comprising a frame, an air tank and an infusion pump arranged on the frame. A three-dimensional motion mechanism and a control module for controlling the three-dimensional motion mechanism to do three-dimensional motion are arranged above the frame. A temperature-controllable heating platform is arranged in the frame and under the three-dimensional motion mechanism. An integrative ultrasonic spray nozzle system capable of high-temperature coating is arranged between the heating platform and the three-dimensional motion mechanism and is toward the heating platform, and the infusion pump is communicated with the integrative ultrasonic spray nozzle system which is glidingly connected with the three-dimensional motion mechanism. Utilizing an integrative ultrasonic spray nozzle, the coating device solves the problems of high ultrasonic frequency, uneven gas spray and complex organization existing in the traditional ultrasonic spray mode. Utilizing a peripheral cooling gas nozzle, the coating device solves the problem that the integrative ultrasonic spray nozzle is usually used in low temperature and realizes high-temperature film formation.

The invention relates to a method for extracting tungsten-molybdenum from high-molybdenum scheelite. The method comprises the following steps: leaching high-molybdenum scheelite with a sulfuric acid solution, and extracting molybdenum from the leaching liquid; extracting leaching residues with hydrogen peroxide so as to obtain a solution with peroxy-tungstate and peroxy-molybdate, and heating or introducing SO2 so as to obtain a solution with tungstate and peroxy-molybdate; dissolving the tungstate with hydrogen peroxide, heating the obtained solution, and introducing SO2 so as to obtain tungstate and a solution with peroxy-molybdate; repeating the operation for multiple times till pure tungstate is prepared; preparing tungsten trioxide or tungsten powder from the pure tungstate; heating the solution with the peroxy-molybdate, or introducing SO2, dissolving the obtained molybdate with a hydrogen peroxide solution so as to obtain a peroxy-molybdate solution, and performing ultrasonic spray pyrolysis, so as to obtain a molybdenum trioxide powder or a molybdate powder. The method is good in separation effect, simple in operation process, easy in operation process control, and easy inindustrial popularization and application.

The invention discloses an active carbon material with a spherical structure. The active carbon material is prepared by subjecting saccharides and a carbon material to ultrasonic dispersion, spray pyrolysis, and carbonization, wherein the mass ratio of saccharides to the carbon material is 1-5:1. Through an ultrasonic spray pyrolysis method, the active carbon material is prepared and is taken as an active substance carrier for the cathode material of a lithium sulfur battery. The prepared active carbon material has a spherical structure, which is formed by the self-supporting effect of the carbon material; cavities exist in the spheres, the specific surface area is large, the dispersibility is good, and the electrochemical properties of the cathode material are improved effectively. Moreover, the operation of the preparation method is simple, the cost is low, and the preparation method is energy saving and environmentally friendly. The pore structure of the prepared active carbon material is abundant. The active carbon material is taken as an active substance carrier for a lithium sulfur battery, which has the advantages of high electrochemical specific capacity, excellent cycle performance, stable structure, and environmental friendliness.

The invention prepares transparent low-distance and high-distance films by ultrasonic spray thermolysis technique. It uses a technique of ultrasonic spray deposition, and has the characters of large area and high deposition ratio. By improving the film forming device by ultrasonic spray thermolysis, it changes the spout from one point to one slot, which makes gas uniformly ejected on a line. The sample moves at uniform speed in the direction of the vertical spraying slot so that the thickness of the deposited film can be made uniform and consistent. It can be used in preparation of the transparent low-resistance films and transparent intrinsic high-resistance films of solar energy batteries and LCDs.

The invention discloses a method for directly preparing samarium-iron alloy powder through a spray pyrolysis reduction method. A mixed aqueous solution of samarium salt and iron salt is used as a spray precursor solution, spherical samarium-iron composite oxides are prepared through the ultrasonic spray pyrolysis method, and samarium-iron alloy is obtained through hydrogen prereduction and then calcium reduction or directly through calcium reduction. According to the method, the cost of raw materials is low, the mole ratio of samarium and iron in the samarium-iron alloy can be easily obtainedby adjusting the proportion of the samarium salt and the iron salt in the precursor solution, the samarium and iron dispersity during reduction diffusion is good, the reduction temperature is low, thereaction time is short, samarium volatilization can be effectively reduced, and agglomeration of the samarium-iron alloy powder can be effectively restrained. According to the method, the pure-phasesamarium-iron alloy powder with the size being 0.5-10 micrometers and in the form of nearly spherical particles can be directly prepared without the need of a follow-up ball-milling crushing process,samarium-iron alloy grains are complete, following improvement on the performance of samarium iron nitrogen is facilitated, and samarium iron nitrogen has good flowing machinability when combined withmacromolecules.

The invention discloses a FeS2 nano-material with a three-dimensional structure. The FeS2 nano-material is FeS2 nanochains with a three-dimensional porous structure or FeS2 nano-pedals with a three-dimensional structure. The invention also provides a method for preparing the FeS2 nano-material. For example, the FeS2 nanochains are prepared through a magnetic field-assisted ultrasonic spray pyrolysis method; or, the FeS2 nano-pedals are prepared through a hydrothermal synthesis method. The FeS2 nano-material provided by the invention has a three-dimensional structure, has high electrochemical activity, excellent electric properties and high mechanical strength, and has advantages of pure phase, high degree of crystallization, no impurity and the like. In addition, the preparation technology is simple and low-cost, has high output, and is suitable for large-scale production.

The invention relates to a method for synthesis of a silica loaded nickel-platinum catalyst by ultrasonic spray pyrolysis. The method includes: step 1. preparing a nickel-platinum-containing soluble compound solution; step 2. atomizing the nickel-platinum-containing soluble compound solution; step 3. vaporizing silicon tetrachloride; step 4. bringing the atomized nickel-platinum liquid drops and silicon tetrachloride vapor to undergo a pyrolytic reaction so as to generate nanoscale silica, simultaneously making the active nickel-platinum-containing soluble compound form catalyst particles under high temperature and loading them on the nano-silica; and step 5. collecting and drying the catalyst. The method provided in the invention solves the problems that a silica carrier is expensive and the loading process is complex, has a simple synthesis process, and the obtained nano-silica loaded nickel-platinum catalyst has high activity and good dispersity.

The invention discloses an ultrasound spray pyrolysis preparation method of a MgO buffer layer for a coating conductor. The ultrasound spray pyrolysis preparation method comprises the steps of: with a magnesium nitrate solution as a precursor solution, epitaxially growing the MgO buffer layer on a NiW alloy substrate by using an ultrasound spray pyrolysis technology; fixing the cleaned NiW alloy substrate on a heating platform, and heating the cleaned NiW alloy substrate to 580-630 DEG C; with the magnesium nitrate solution as the precursor solution, atomizing and spraying the precursor solution on the NiW alloy substrate in a way of spraying for 20-60s, stopping for 40-120s and then spraying again by using an ultrasound atomizer, and finally preserving the heat for 30-60min to obtain the MgO buffer layer, wherein the spraying operation lasts for 10-30min in total. The method is free of vacuum systems, high in film forming speed and capable of reducing the production cost and increasing the production efficiency.

A process of making an electrochromic or an electrolytic film by Ultrasonic Spray Pyrolysis (USP) deposition on a substrate comprising:

• • mixing a surfactant to an aqueous precursor solution comprising an electrochromic component or an electrolytic component to provide a spray solution;
  • introducing the spray solution into an ultrasonic spray deposition nozzle at a constant flow rate between 0.1 mL/min and 2 mL/min and applying an ultrasonic frequency between 80 and 120 kHz to generate atomized droplets of the precursor solution;
  • entraining the atomized droplets with a controlled jet of air as gas carrier at a pressure between 0.50 to 2.0 psi, onto a pre-heated substrate at a temperature of 200 to 450° C.;
  • thermally converting the atomized droplets when depositing onto the pre-heated substrate to generate an electrochromic or an electrolytic film.

The invention discloses a method for preparing porous carbon materials with different morphologies by ultrasonic spray pyrolysis regulation and control. The method comprises the following steps: dissolving a soluble metal salt and a soluble sugar in water to prepare a precursor solution; ultrasonically atomizing the precursor solution into fog drops, and then introducing the fog drops into pyrolysis equipment by using a carrier gas for pyrolysis to obtain a metal oxide composite porous carbon material; and dissolving and cleaning the metal oxide in the metal oxide composite porous carbon material with an acid to obtain the porous carbon materials with different morphologies. The porous carbon materials with different morphologies can be regulated and controlled by changing the proportion of precursors, and the porous carbon materials with different specific surface areas and pore diameters are obtained. The prepared material is attractive in appearance and uniform in size distribution,the method has the advantages of being simple in process, easy to control in reaction, low in cost and free of pollution, a large number of good porous carbon materials with different appearances canbe continuously prepared, and the method is very suitable for large-scale production.

The invention relates to a method for extracting molybdenum from crude molybdic acid and preparing a molybdenum product. The method comprises the steps that the crude molybdic acid is dissolved with ahydrogen peroxide solution, and an obtained peroxo-molybdic acid solution is heated or SO2 is led into the obtained peroxo-molybdic acid solution until molybdic acid is completely decomposed from peroxo-molybdic acid; filtering is carried out to obtain the molybdic acid; dissolution is carried out by hydrogen peroxide, and decomposition and purification are carried out; the steps of dissolution,decomposition and purification are repeated several times until pure molybdic acid is prepared; calcinations is carried out to prepare molybdenum trioxide; and or the obtained pure molybdic acid is dissolved with hydrogen peroxide, filtering is carried out to obtain a pure peroxo-molybdic acid solution, and then ultrasonic spray pyrolysis is carried out to prepare molybdenum trioxide powder or toprepare molybdenum powder. According to the method, the separation effect is good, the operation process is simple and easy to control, and the method is easy to be industrialized and popularized.

The invention discloses a preparation method of an anode material LiNi0.5Mn0.5O2 of a battery. The preparation method includes the following steps: a, dissolving nickel nitrate, manganous nitrate and lithium nitrate with the molar ratio of 0.5: 0.5: (1.05-1.2) in deionized water to form solution, adding proper amount of NH4NO3 into the solution and evenly stirring the solution; b, performing ultrasound spray pyrolysis on the solution prepared in the step a to obtain powder, wherein the ultrasonic frequency is 1.8-2 MHz, and the pyrolysis temperature is 950-990 DEG C; and c, calcining the powder obtained in the step b for 5-12 hours at the temperature of 700-900 DEG C to obtain finished products. Nitrate of nickel, manganese and lithium serves as the raw materials, and the deionized water serves as the solvent, so that the raw materials are fully mixed in molecular state, the raw materials are evenly mixed by means of ultrasonic spray pyrolysis, and the preparation steps are simplified. The preparation method has the advantages of being even in raw material mixing and simple in preparation method.

The invention discloses a preparation method of a novel composite flat plate electric heating film. The method comprises the steps of dissolving butyltin trichloride (MBTC), SbCl3 and NH4F which are used as a precursor in a solvent prepared from ethyl alcohol and water according to a proportion so as to use as a first precursor liquid; dispersing silver nanoparticle in deionized water to use as asecond precursor liquid; preparing acrylic resin to form a template agent, dropwise adding the template agent onto a quartz substrate, and drying to form a chapped template network; dropwise adding and spin-coating the second precursor liquid onto a substrate for forming a template, and performing annealing after drying; depositing the first precursor liquid onto the substrate and performing thermal processing by a method of ultrasonic spray pyrolysis; and fabricating an electrode to from an electric heating film device. The method has the advantages that the novel composite flat plate electric heating film has relatively high oxidization-resistant performance by a tin oxide thin film at the outermost layer, and stable film layer resistance during the application process can be maintained;the silver nanoparticle has excellent electric and heat conversion efficiency, a relatively high temperature can be achieved under a low voltage; and meanwhile, the novel composite flat plate electric heating film has excellent light transmittance with the adoption of the quartz substrate, and the light transmittance reaches 80% or above.

A gas-sensitive element of semiconductor sensor for detecting NO2 gas is an indium tin oxide film on quartz substrate having Au electrodes and heating layer of ruthenium oxide resistor. Its preparing steps includes dissolving indium in nitric acid, adding SnCl4, diluting with deionized water to obtain reaction liquid, loading said quartz substrate in tubular furnace, atomizing said reaction by ultrasonic oscillator, carrying the atomized reaction liquid into tubular furnace by N2, and spraying it toward quartz substrate. It has high sensitivity.

The invention relates to the technical field of photoelectrocatalysis, and provides a preparation method of a copper tungstate photo-anode film. The preparation method comprises the following steps: mixing copper nitrate trihydrate, ammonium metatungstate and water to obtain a precursor solution; carrying out ultrasonic spray pyrolysis coating on the obtained precursor solution to form a copper tungstate precursor film on the substrate; and carrying out heat treatment on the obtained copper tungstate precursor film to obtain the copper tungstate photo-anode film. According to the preparation method, the precursor solution can be atomized into nanoscale small liquid drops by adopting an ultrasonic spray pyrolysis coating method, the solid film with uniform thickness is finally formed on the substrate through reaction processes such as solvent evaporation and solute thermal decomposition, crystallization of the precursor film can be promoted during heat treatment, and the uniformity of the structure of the copper tungstate photo-anode film is further improved, so that the visible light responsiveness of the copper tungstate photo-anode film can be improved. Experimental results show that the copper tungstate photo-anode film prepared by the preparation method provided by the invention is uniform in thickness and has excellent photoelectric properties.

The invention discloses a preparation method of a wrinkly nano-rGO composite material. The preparation method of the wrinkly nano-rGO composite material comprises the following steps: (1) adding a metal salt to a GO dispersion, and performing uniform mixing to prepare a mixed solution; (2) performing ultrasonic spray pyrolysis on the mixed solution, and collecting prepared black powder to obtain the wrinkly nanometer metal oxide/rGO composite material. A preparation method of the wrinkly nanometer metal oxide is characterized in that the wrinkly nanometer metal oxide/rGO composite material iscalcined in a protective gas atmosphere to obtain the wrinkly nanometer metal oxide with a wrinkly spitball-shaped microstructure. The nanometer metal oxide/rGO composite material is prepared in a one-step manner through combining a spray pyrolysis process with a template process with GO and a metal salt as a precursor, and is calcined to prepare the wrinkly nanometer metal oxide. The preparationmethods have the advantages of simple process, short cycle, easily available raw materials and low cost, and the prepared metal oxide powder has a large surface area and rich pore structures.

The invention relates to a preparation method of an ultra-fast-flickering ZnO film, which comprises the following steps: acid treatment on monocrystalline silicon wafer: measuring concentrated sulfuric acid and concentrated phosphoric acid, mixing the concentrated sulfuric acid and concentrated phosphoric acid, heating, putting the monocrystalline silicon wafer into the acid mixture, keeping the temperature for 10-40 minutes, naturally cooling, taking out the monocrystalline silicon wafer, cleaning with ethanol, carrying out ultrasonic cleaning, and carrying out blow-drying; and by using the treated monocrystalline silicon wafer as a substrate material, preparing a 40-60nm-thick ZnO film as a seed crystal layer on the substrate by a magnetron sputtering film deposition technique, and depositing a ZnO film on the ZnO seed crystal layer by an ultrasonic spray pyrolysis process, wherein the spray delivering carrier gas is N2, the deposition temperature is 370-390 DEG C, and the thickness of the ZnO film is 150-250nm. The ZnO film obtained by the method has the advantages of (002) preferred orientation characteristic, strong ultraviolet emission and ultra-fast flickering.

The invention provides a method for preparing a micro-nano structure Prussian blue sodium ion battery positive electrode material through ultrasonic spray pyrolysis. The method particularly relates to the following process: (1) preparation of a precursor: firstly preparing a nano-particle morphology electrode material by using a precipitation method, mixing the nano-particle morphology electrode material with deionized water, stirring, standing, filtering and re-dispersing the nano-particle morphology electrode material into the deionized water; and (2) ultrasonic spray pyrolysis: mixing the suspension prepared in the step (1) with LiOH, KOH, Na2CO3 and the like), putting the mixture into an ultrasonic atomizer, introducing the atomized solution into a high-temperature tubular furnace (heating to a target temperature of 200-400 DEG C), and collecting a product, thereby preparing the mesoporous spherical electrode material which has a proper specific surface area and is relatively uniform in size distribution and consists of nanoparticles. The preparation method disclosed by the invention is simple, low in raw material price and suitable for industrial production.

The invention relates to a preparation method for a composite conductive film doped with tin oxide, and the method comprises the steps: preparing mixed liquid of SnCl4, a dopant and an organic solvent, adding graphene to the mixed liquid for ultrasonic dispersion after the mixed liquid is placed quietly, coating the surface of the substrate with the mixed liquid through an ultrasonic spray pyrolysis coating machine, spraying the mixture containing no graphene, placing the substrate in an argon atmosphere for annealing under the temperature of 500 DEG C to obtain a tin oxide conductive film. The method solves a problem that the conductivity of the tin oxide conductive film is lower, employs simple equipment, and is easy to control. The prepared conductive film is uniform in surface, is compact in structure, is good in conductivity, and is firmly combined with the substrate.