200 results about "Barium acetate" patented technology

The invention provides a method for preparing barium titanate nano-powder, which comprises the following steps: preparing precursors from tetrabutyl titanate and barium acetate by using citric acid as complexing agent and polyethylene glycol as dispersing agent; and subjecting the precursors to water-bath evaporation, drying, foaming and calcining to obtain the barium titanate nano-powder. The method of the invention has the advantages of short preparation period, high purity, simple process and equipment and high yield.

The invention discloses a method for preparing strontium titanate nanometer powder with one-dimension structure, which consists of procedures of preparing the oxyhydroxide precipitate of titanium and the deionized aqueous solution of barium acetate as reaction materials, adding a feasible quantity of potassium hydroxide to promote crystallization, and appending a suitable viscosity of patterned vertical alignment polymer surfactant to control the feature; under the temperature of 100-150 DEG C, strontium titanate nanowire and a branched crystal structure are obtained after a hydrothermal reaction. The craftwork of the invention is simple; the micro feature of the product is easy to control, the pollution is free; the cost is low; a large-scale production is suitable. The quality of the crystallization of the prepared product is stable; the specific surface is big. A broad application prospect is possessed in fields of micro electronic devices, EO devices, storage devices, oxygen sensors, photocatalyst, and solar battery, etc.

The invention discloses a preparation method of a high temperature superconductive film adopting a modified low fluoride solution method, which comprises the following steps: dissolving yttrium oxide, barium acetate and copper acetate as raw materials in a solvent using a complexing agent to obtain a low fluoride yttrium barium copper oxygen solution, preparing a gel film and drying, and performing pretreatment and end treatment of the film. The sol has easily adjustable composition, stable performance and good film forming property, the yttrium barium copper oxygen superconductive film can be easily prepared using the sol, and the heat treatment cycle is short and the process repeatability is high. In addition, the solution avoids the introduction of amine group, so as not only to avoid the loss of copper in the heat treatment, but also to avoid the problem that the film is easy to craze. The method of the invention is also used for preparing large-area or long-distance yttrium barium copper oxygen films and coated conductors, the obtained yttrium barium copper oxygen film has good surface smoothness and has good superconductivity.

The invention discloses a method for preparing a yttrium barium copper oxide superconducting film with high critical current density, which comprises the following concrete steps: a, preparing a precursor solution, which is to dissolve yttrium acetate, barium acetate, copper acetate and acetate of an impurity element into propionic acid according to the proportion that the stoichiometric ratio of yttrium: barium: copper: impurity element is 1: 2: 3-X: X (the X is more than or equal to 0.0002 and less than or equal to 0.008) to obtain the precursor solution, and the impurity element is one of Co, Fe, Zn, Ni, and Li; b, adding a polymer material polyvinyl butyral (PVB) into the precursor solution obtained in a step to obtain a coating colloid; c, coating and drying the coating colloid on a substrate to form a film; and d, performing thermal decomposition treatment on the substrate with the film prepared in c step and then imaging thermal treatment to obtain the YBCO superconducting film. The yttrium barium copper oxide superconducting film prepared by the method has high biaxial texture, smooth and compact surface, high critical current density under a magnetic field, low cost, and simple process, and is suitable for mass industrial production.

The invention discloses a method for preparing barium titanate monocrystal nano particles of six-pin structural perovskite, and a two-step hydrothermal method is adopted. The method comprises the following steps of: depositing tetrabutyl titanate which serves as a precursor by use of oxyhydroxide of titanium prepared from ethylene glycol monomethyl ether; performing hydrothermal reaction by utilizing potassium hydroxide a mineralizer, so as to obtain a K2Ti6O13 nano line; and performing secondary hydrothermal reaction on the prepared K2Ti6O13 nano line which serves as a titanium source, barium acetate which serves as a barium source and KOH which serves as the mineralizer, so as to obtain the barium titanate monocrystal nano particles of the six-pin structural perovskite. The process is simple and easy to control; pollution is avoided; the cost is low; large-scale production is realized; and the barium titanate monocrystal nano particle crystal of the six-pin structural perovskite is high in purity and high in dispersion.

The invention discloses a method for preparing yttrium barium copper oxide fluorine-free sol and a high-temperature superconductive membrane. The mol ratio of the following compositions of the fluorine-free sol, namely yttrium acetate to barium acetate or barium hydroxide to copper acetate to diethylenetriamine or ethanolamine or diethanolamine or trolamine to lactic acid to acrylic acid or alpha-methacrylic acid or metacetonic acid to methanol or ethylene glycol monomethyl ether or ethanol, is 1:2:3-4:1.5-5:6-10:6-40:60-360. The method for preparing the superconductive membrane is to adopt different complexing agents to dissolve acetate in a solvent to prepare the yttrium barium copper oxide fluorine-free sol, adopt a crystal pulling method to prepare the fluorine-free sol into a yttrium barium copper oxide gel membrane, perform heat treatment on the gel membrane, and prepare the yttrium barium copper oxide high-temperature superconductive membrane. During preparation of the membrane from the sol, the pyrolysis process is not required; the whole heat treatment time is shortened by approximately 10 hours compared with the prior fluorine-containing technology; and no corrosive HF gas is generated during preparation of the membrane, so that environmental pollution is low.

The invention belongs to the field of resource reuse, and relates to a high-valued reuse method for copper anode mud silver separating residues of circuit boards, especially relates to the preparation of barium plumbate powder by using copper anode mud silver separating residues of circuit boards as raw materials by means of coprecipitation. The method comprises the following steps: carbonating the copper anode mud silver separating residues of circuit boards through a sodium carbonate solution, filtering to obtain carbonation reaction residues and a post-carbonated-reaction solution; neutralizing the post-carbonated-reaction solution to neutral with sulfuric acid, evaporating and crystallizing the solution to recycle the sodium carbonate; dissolving the carbonated-reaction residue with an acetum and filtering the solution to obtain a deleaded residue and a lead acetate solution; adding barium acetate to the lead acetate solution, uniformly mixing and dropwise adding an oxalic acid solution; filtering the solution to obtain a barium plumbate ceramic powder precursor and a post-oxalic acid precipitation solution; roasting the barium plumbate ceramic powder precursor to obtain the barium plumbate ceramic powder. Compared with prior art, the method is characterized by no secondary pollution, and high-valued reuse of a lead secondary resource, and the method is suitable for industrial production.

The invention relates to a method for preparing one-dimensional core-shell structure BaTiO3@Al2O3 by means of one-step synthesis. The method comprises the steps of respectively adding the spinning liquid of a core layer and the spinning liquid of a shell layer into a needle cylinder arranged at the inner layer and a needle cylinder arranged at the outer layer, using two needles heads with different diameters to sleeve each other to form a coaxial two-layer spinneret, and spinning by adopting an electrostatic spinning method, wherein the spinning liquid of the core layer is prepared from barium acetate, tetrabutyl titanate and polypyrrolidone in proportion, and the spinning liquid of the shell layer is prepared from aluminium isopropoxide and polypyrrolidone in proportion. The product prepared by the method has a core-shell structure, organic matters volatilize after the product is sintered at high temperature, and the one-dimensional core-shell structure BaTiO3@Al2O3 is finally formed, wherein the one-dimensional core-shell structure BaTiO3@Al2O3 has the length of about 10-150mu m and the diameter of about 150-400nm (the core layer is about 75-200nm). Compared with the prior art, the method has the advantages of being low in preparation cost, simple in preparation technology and controllable in thicknesses of the core layer and the shell layer, being capable of realizing mass production, etc.

The invention relates to a preparation method for a barium titanate/graphene composite nanometer material, and the method employs a wet chemical reaction process. The preparation steps comprise: taking 2-methoxyethanol as a solvent dissolving a titanium ion, utilizing ammonia water as a precipitating agent to precipitate titanium ion, adding an aqueous solution of graphene oxide, and fully mixing; utilizing a deionized water solution of barium acetate as a barium source, and taking a mixed solution of ethylenediamine and ethanolamine as a solvent; and finally utilizing a mineralization agent potassium hydroxide to promote crystallization, and performing hydro-thermal reaction to obtain the barium titanate/graphene nanometer powder. The preparation method is simple in process, easy to control, free of pollution and low in cost, and the prepared barium titanate/graphene composite nanometer material is high in purity and good in crystallinity.

The invention relates to barium zirconate titanate calcium-based piezoelectric ceramic and a preparation method thereof, belonging to the technical field of piezoelectric ceramic electronic components and devices. The ceramic has a chemical constitution represented by a general formula as follows: Ba1-xCaxTi1-yZryO3. The preparation method comprises the following steps: preparing chelate sol from tetrabutyl titanate, citric acid, barium acetate, calcium nitrate, zirconium nitrate, glycol, alcohol and the like in a molar mass/volume ratio, and coking and calcining the sol, so as to obtain nano-powder; and carrying out granulation, dry-pressure formation and glue discharging on the nano-powder, heating to 1250-1290 DEG C, stopping heating, and carrying out furnace cooling until the sintering temperature is 1150-1250 DEG C, so as to obtain the ceramic. After the ceramic is subjected to polishing, silver coating and polarization, measurement shows that the ceramic has excellent electrical properties: the piezoelectric coefficient d33 is equal to 479pC/N-634pC/N, and the maximum relative dielectric constant epsilonr is equal to 12328-13582.

The invention discloses a preparation method of a barium-calcium carbonate and potassium-sodium niobate alternative spin-coating lead-free piezoelectric thick film. The preparation method comprises the following steps of: based on a sol-gel process, preparing Bi0.5Ca0.5Ti03(BCT) precursor sol with concentration of 1mol/L by adopting barium acetate (Ba(CH3COO)2), calcium nitrate terahydrate (Ca(NO3)2.4H2O) and tetrabutyl titanate (C16H36O4Ti) as the materials, adopting ethylene glycol monomethyl ether (C3H8O2) and glacial acetic acid (CH3COOH) as solvent, and adopting acetylacetone (C5H8O2) as stabilizing agent; preparing K0.5Na0.5NbO3 (KNN) precursor sol with concentration of 0.6mol/L by adopting ethylene glycol (C2H6O2) as esterifying agent, adopting nitric acid as metal coordination agent and introducing polyvinylpyrrolidone (PVP) as modifying agent; coating the KNN sol on the (Pt/TiO2/Ti/SiO2/Si) substrate, and coating the BCT sol after the thermal treatment; repeating the steps by three times, i.e., carrying out spin-coating for six layers alternatively; and obtaining the KNN-BCT film through annealing treatment. The obtained film is uniform in crystalline grain, compact in arrangement, smooth in surface and free of cracks.

The invention belongs to a method for preparing barium sulfate particles through a microchannel method in the technical field of nanomaterial preparation. The method comprises the following steps: introducing a sulfate water solution and a barium salt water solution into a microchannel reactor for reacting and ageing, and centrifuging, washing and drying an obtained reaction solution, thus obtaining the barium sulfate particles, wherein selected sulfate is sodium sulfate, ammonium sulfate or sodium persulfate, and barium salt is barium chloride, barium acetate or barium nitrate. The morphologyand the particle size distribution of the obtained barium sulfate particles are controllable, and industrial application of medical dry films can be met to a larger extent.

The invention belongs to the technical field of lithium battery material recovery, and particularly relates to a method for recycling a lithium nickel cobalt manganese oxide ternary positive electrodematerial of a retired lithium-ion power battery. The method comprises the following steps: (1) carrying out discharging, disassembling and sorting on a waste ternary lithium-ion battery, soaking thepositive plate with dilute acid, carrying out cooperative mechanical stirring and ultrasonic cleaning, and separating out a current collector; (2) removing impurities, carrying out filtering, and regulating and controlling the ion proportion of the leachate; (3) carrying out spray drying, and then carrying out stepped high-temperature calcination to obtain the Lithium nickel cobalt manganese oxideternary positive electrode material. According to the invention, the purpose of separating the current collector and the battery material is achieved through a dilute acid leaching-stirring cleaningmethod, and separation efficiency reaches 99% or above; Al and Fe impurity ions are removed by regulating and controlling the pH value through ammonia water; and influence of SO4<2-> ions can be removed by adding barium acetate. The recycling method disclosed by the invention is simple in process, few compounds are introduced in the process, purity of by-products is high, the process is green andpollution-free, and the method is suitable for industrial popularization.

The invention relates to a method for preparing an yttrium-barium-copper-oxygen high-temperature superconducting film. First, a precursor solution is prepared. Yttrium acetate (Y(CH3COO)3), barium acetate (Ba(CH3COO)2), and copper acetate (Cu(CH3COO)2) with a molar ratio that Y:Ba:Cu=1:2:3 are mixed in a water solution of 10-30mol% acetic acid. The mixture is well mixed, and is subjected to vacuum evaporation, such that the solvent is removed, and a gel is obtained; trolamine and terpineol are added to the gel, a proper amount of ammonia water is added, and the pH of the solution is regulated to 5-7, such that a precursor with a total concentration of the Y, Ba and Cu ions being 1.5-3.0mol/L is prepared. The precursor solution is coated on a substrate. The coated film is subjected to a low-temperature heat treatment under a temperature of 300-500 DEG C, and is then subjected to a high-temperature heat treatment under a temperature of 750-850 DEG C and an annealing treatment under a temperature of 450-550 DEG C, such that the YBCO superconducting film is formed.

The invention discloses a modified titanium-silicon molecular sieve, a modification method, and application thereof in propylene epoxidation reaction. The modified titanium-silicon molecular sieve is obtained by the following steps: dissolving barium salt in water to prepare a barium salt aqueous solution, and then adding a strip-shaped titanium-silicon molecular sieve, wherein the weight ratio of the barium salt to the water to the strip-shaped titanium-silicon molecular sieve is (0.001-0.5):(0.1-5):1; and performing impregnation for 1-72h, performing filtration, drying a solid at 80-120 DEG C for 3-5h, and then performing roasting at 500-550 DEG C for 4-12h to obtain the modified titanium-silicon molecular sieve, wherein the strip-shaped titanium-silicon molecular sieve is obtained by mixing titanium-silicon molecular sieve raw powder with sesbania cannabina powder and silica sol uniformly and then performing strip extrusion forming, and the barium salt is barium nitrate, barium acetate or barium chloride. The modified molecular sieve is a strip-shaped titanium-silicon molecular sieve with an MFI structure; and as a catalyst, the modified molecular sieve is applied to a liquid phase propylene epoxidation process. The modification method disclosed by the invention is simple in operation process, and due to a mutual synergistic effect between the barium salt and the titanium-silicon molecular sieve, the modification method, when applied to the propylene epoxidation reaction, can obviously reduce invalid decomposition of hydrogen peroxide as well as effectively improve the effective utilization of hydrogen peroxide and the selectivity of a product namely propylene epoxide.

The invention discloses a process of plating a diamond surface with a composite film. The process comprises the following steps: 1) performing surface treatment on a diamond grinding material; 2) mixing barium acetate with glacial acetic acid to prepare stable BaO sol, soaking the grinding material with the BaO sol, and drying and roasting the grinding material to obtain the diamond grinding material plated with a BaO film; 3) mixing chromic nitrate with glacial acetic acid to prepare stable Cr2O3 sol, soaking the grinding material with Cr2O3, drying and roasting the grinding materials to obtain the diamond grinding material coated with a BaO/Cr2O3 film. According to the process, the surface of the diamond grinding material can be plated with a layer of compact composite film, so that harmful chemical reaction on the diamond grinding material and ceramic bond in a sintering process can be avoided, the wettability of the diamond grinding material and the ceramic bond can also be improved, the holding force on the diamond grinding material by the ceramic bond is increased, and the service life of a grinding tool is prolonged.

The invention provides a preparation method of a core-shell type highly dielectric filler from barium titanate-doped multi-walled carbon nanotubes. The filler is prepared through an impregnation sintering method, the surface energy of the acidified multi-walled carbon nanotubes is reduced by the use of an anionic surfactant of sodium dodecyl benzene sulfonate (SDBS), the adsorption of ions on the acidified multi-walled carbon nanotubes is promoted in the impregnation process, the hydrolysis of a sol-gel impregnation liquid formed from barium acetate and tetrabutyl titanate in an acetic acid and ethanol system is carried out on the surfaces of the acidified multi-walled carbon nanotubes to form a continuous gel layer, and the gel layer is subjected to vacuum drying and high temperature calcination at 800 DEG C under nitrogen atmosphere. The preparation process includes firstly preparing the barium acetate and tetrabutyl titanate sol-gel impregnation liquid, then adding the acidified multi-walled carbon nanotubes, and reacting at room temperature. The core-shell type multi-walled carbon nanotube highly dielectric filler is finally obtained through the regulation of the surfactant. The inventive method is simple in conditions, is an effective way for the preparation of a multifunctional core-shell type multi-walled carbon nanotube composite, and has flexible and wide applicability and industrialized prospects.

The invention discloses a preparation method for a barium strontium titanate thick (BST) film material, which is used for solving the technical problem that the barium strontium titanate (BST) thick film material with a substrate prepared by a conventional preparation method has poor electrical property. The technical scheme comprises the following steps: preparing a BST colloid from barium acetate, strontium hydroxide, tetrabutyl titanate, glacial acetic acid, ethylene glycol monomethyl ether and acetylacetone; and tape-casting the BST colloid and then sintering the colloid at the high temperature so as to obtain the barium strontium titanate thick film material. Because the barium strontium titanate thick film material with substrate is prepared by the tape-casting method, the dielectric loss of the barium strontium titanate thick film material is reduced from about 0.02 to below 0.02 so as to improve the electrical property of the barium strontium titanate thick film material; and the barium strontium titanate thick film material has high compactness and uniform granularity.