19 results about "Barium acetate" patented technology

The invention discloses a method for preparing nano barium titanate based on sol-gel synergistic hydrothermal reaction, which comprises the following steps: (1) dissolving barium acetate in an acetic acid aqueous solution to obtain a barium source solution; weighing tetrabutyl titanate according to the molar ratio of barium to titanium being greater than 1.25, and dissolving the tetrabutyl titanate in alcohol to obtain a titanium source solution; (2) uniformly mixing the barium source solution and the titanium source solution, preserving heat at 20-80 DEG C to obtain gel, drying and grinding to obtain white powder of the barium titanate precursor: (3) preparing a 2-4mol / L inorganic strong alkali aqueous solution, adding the white powder and a dispersing agent into the inorganic strong alkali aqueous solution, and fully stirring to obtain a barium titanate precursor suspension; and (4) transferring the barium titanate precursor suspension into a reaction kettle for hydrothermal reaction, and after the reaction is completed, washing, drying and grinding to obtain the nano barium titanate powder. The preparation method is low in cost, and the prepared nano barium titanate powder is uniform in distribution, spherical or sphere-like in morphology, small in particle size, 80-150nm in average particle size and good in particle crystallinity.

The invention discloses a strontium-doped bismuth titanate-based ferroelectric film and a preparation method thereof, and belongs to the technical field of dielectric energy storage materials. The chemical composition of the film is Ba < 1-x > Sr < x > Bi < 4 > Ti < 4 > O < 15 >, wherein x ranges from 0.025 to 0.1. The preparation method comprises the following steps: mixing ethylene glycol monomethyl ether and ethylene glycol, adding bismuth nitrate, barium acetate, strontium acetate and butyl titanate, fully stirring and filtering to obtain a precursor solution, aging, dripping to the center of a substrate for spin coating, heating a spin-coated sample to obtain a dry film, and annealing to obtain the ferroelectric film. The method is low in technological condition requirement, and the thin film obtains the optimal energy storage density by changing the doping proportion of Sr. According to the ferroelectric film, when x is equal to 0.075, the leakage current density of Ba0. 925Sr0. 075Bi4Ti4O15 (BBST75) is only 1.59 * 10 <-7 > A / cm < 2 >, the breakdown field strength is as high as 3.22 MV / cm, and at the moment, the film has the energy storage density of 28.2 J / cm < 3 > and the energy storage efficiency of 80.36%.

The invention belongs to the technical field of material chemistry, and relates to nano barium sulfate and a preparation method thereof. The invention provides a preparation method of nano barium sulfate, which comprises the following steps: adding a barium acetate solution, sulfhydrylated chitosan and sodium stearate into a sodium sulfate solution for mixing reaction, collecting the obtained product after the reaction is ended, filtering, drying and grinding to obtain the nano barium sulfate, the concentration of the sodium sulfate solution is 1.4 to 2.6 mol / L, and the concentration of the barium acetate solution is 1.4 to 2.6 mol / L; 0.05 to 0.15 g of thiolated chitosan and 0.05 to 0.15 g of sodium stearate are correspondingly added into each 100 mL of the sodium sulfate solution. The invention solves the technical problems of high particle size and non-uniform particle size distribution of nano barium sulfate particles when the nano barium sulfate particles are prepared by adopting a direct precipitation method.

The application discloses a ferroelectric thin film and a preparation method thereof. (0.85‑x) Ca 0.15 Gd x ][Zr 0.2 Ti 0.8 ]O (3+0.5x) , wherein x=0.005-0.01. The ferroelectric thin film is prepared by using barium acetate as a barium source, calcium acetate and gadolinium acetate as doping sources, tetrabutyl titanate as a titanium source, zirconium n-butyrate as a zirconium source, acetic acid and glycol methyl ether as mixed solvents, and acetylacetone as an additive, and then uniformly and stably preparing a precursor solution through a sol-gel method, and then obtaining the ferroelectric thin film on a silicon substrate through spin coating, drying and calcining. The ferroelectric thin film has high crystallinity, low roughness and a nanocrystalline dense structure.

The application discloses a preparation method of spherical nano-barium titanate coated nickel powder and belongs to the technical field of MLCC internal electrode materials. The method comprises the following steps: dispersing nano-nickel powder in water and performing ultrasonic treatment; adding titanium tetrachloride into the water, and then adding a nickel powder dispersion liquid; then adding a barium source, adjusting the pH to alkaline by using lye, stirring and reacting at 60-80 DEG C under normal pressure and in an air atmosphere, and separating and drying to obtain the product. The barium source is barium hydroxide, barium chloride or barium acetate. The application uses cheap titanium tetrachloride as a titanium source to synthesize the barium titanate coated nickel powder with a core-shell structure in an aqueous solution in one step, and the reaction condition is mild, and no organic solvent and inert atmosphere protection are needed, so that the process is simple and the cost is low. The obtained product has a continuous and dense coating layer, the oxidation starting temperature is above 385 DEG C, the volume shrinkage rate at 1200 DEG C is less than or equal to 9.1%, the oxidation resistance and sintering shrinkage matching property of the nickel powder are significantly improved, and the product is suitable for MLCC internal electrode materials.

The application discloses a kind of anti-chloride ion permeable concrete, raw materials and the weight percentage it occupies include: cement 200-400 parts, fly ash 60-100 parts, modified composite silica mortar 50-80 parts, modified lithium slag powder 40-60 parts, gravel 950-1050 parts, sand 700-960 parts, water reducing agent 5-10 parts, water 110-130 parts;The modified lithium slag powder is modified by crown ether and barium acetate to lithium slag;Modified composite silica mortar includes silane coupling agent modified unencrypted silica fume and citric acid modified encrypted silica mortar.The anti-chloride ion permeable concrete can greatly improve the anti-chloride ion permeability of concrete, effectively reduce the phenomenon of steel corrosion, and has wide applicability under the premise of ensuring the design strength requirement.

The application discloses a high-purity barium acetate sealed extraction storage device and relates to the technical field of substance extraction. The device comprises a rack and an extraction device. A reaction tank is fixed on the rack. The reaction tank is sequentially connected with a first pump body, the extraction device, a second pump body and a transfer tank through pipelines. The extraction device comprises a liquid inlet pipe connected with the first pump body, a liquid outlet pipe connected with the second pump body and multiple vertical extraction assemblies.

This invention belongs to the field of chemical / biological sensing technology, and relates to the preparation method of barium acetate open framework-based probe materials and their application in L-glutamic acid detection. This invention prepares the host-guest doped material P@1 (P is 1,4-naphthalenedicarboxylic acid, and 1 is C4H6BaO4) via a solvothermal evaporation method. P@1 exhibits a visible green RTP with a duration of approximately 3 s. In terms of detection, P@1 shows a selective phosphorescence-enhanced response to L-Glu, with a detection limit of 0.938 μmol·L⁻¹. ‑1 The detection mechanism primarily involves hydrogen bonding between L-glutamic acid and P@1, which restricts the movement of guest molecules, thereby reducing non-radiative transition pathways and promoting radiative transitions, ultimately leading to enhanced phosphorescence intensity. Finally, this method was developed into a pH test strip, which exhibits significant advantages in amino acid detection, including high sensitivity, speed, simplicity, and low cost, providing a new method for efficient amino acid detection.

This invention belongs to the field of pentosan preparation technology, specifically a method for preparing pentosan. Wheat bran powder undergoes a hydrothermal reaction in an aqueous barium acetate solution. Water extraction yields a supernatant and precipitate containing water-soluble pentosans. Sodium hydroxide and acetylacetone are then added, followed by alkaline extraction at 30-40°C to obtain a supernatant containing both water-soluble and alkali-soluble pentosans. This supernatant is then post-treated to obtain the pentosan product. This invention improves the extraction rate of water-soluble pentosans; the alkaline extraction effect is superior to that achieved using sodium hydroxide and barium hydroxide alone, and it reduces the amount of alkali solution, especially Ba(OH)₂, used.

The invention provides a high-entropy cathode material, a solid oxide fuel cell and a preparation method, and relates to the technical field of fuel cells. The preparation method comprises the following steps: dissolving praseodymium nitrate, barium acetate, strontium nitrate, lanthanum nitrate, calcium acetate, neodymium nitrate and cobalt nitrate in deionized water to obtain a first solution; adding citrate and a chelating agent into the first solution to obtain a second solution; adjusting the pH value of the second solution to 7-10 by using ammonia water to obtain a third solution; heating and stirring the third solution to obtain a gelatinous mixture; and drying, grinding and sintering the gelatinous mixture to obtain the high-entropy cathode material for the solid oxide fuel cell. According to the invention, the electrochemical performance of the cathode material for the solid oxide fuel cell can be improved.

The application belongs to the technical field of printed circuit board manufacturing, and particularly relates to a high-insulation blind via PCB board and a preparation method thereof. In the preparation of the substrate, the inner chip layer, the epoxy resin glass cloth substrate and the copper foil are first pressed once to obtain a PCB sub-board, then a hole is drilled and plated with copper to obtain a blind hole, and finally the PCB main board is obtained through secondary pressing, hole sealing and solidification, silk screen printing of marks, detection and packaging, so that the high-insulation blind via PCB board is obtained. The secondary pressing makes the sub-boards fully bonded, the 2-butyl long-chain alkyl group is introduced into the insulating epoxy resin to improve the toughness and impact resistance, and the norbornene rigid group is introduced to make the insulating epoxy resin effectively absorb internal stress; the tetrabutyl titanate and barium acetate are prepared into dry gel through gelation, the insulating ceramic powder is prepared through grinding and calcination, the surface is modified through kH-560 to introduce an epoxy group, the dispersibility of the insulating medium filler in the epoxy resin is improved, and the insulation performance of the high-insulation blind via PCB board is improved through gradient temperature curing.

The application discloses a preparation method of a dihydroxyethyl bisphenol A ether and belongs to the technical field of organic synthesis. The steps of the preparation method are as follows: bisphenol A, a mixed acetate catalyst and a solvent are added into a reaction kettle, nitrogen is replaced after stirring is started, the temperature is increased to a reaction temperature, then the reaction is started by introducing ethylene oxide, the temperature is kept after the ethylene oxide is added completely, the reaction is continued until the pressure does not decrease, the temperature is decreased to a desolventizing temperature, then desolventizing is carried out until no solvent comes out, and then the temperature is decreased, the gas is removed, and the product is discharged, so that the dihydroxyethyl bisphenol A ether is obtained; wherein the mixed acetate catalyst is composed of calcium acetate, magnesium acetate and barium acetate; and the solvent is methylcyclohexane. The preparation method has excellent catalytic effect, the prepared dihydroxyethyl bisphenol A ether has high content, low hydroxyl value and light color, and the solvent has small toxicity and is easy to recycle.

This invention belongs to the technical field of resistive electrical components, and specifically relates to a method for preparing a zinc oxide resistor with high gradient and high current flow stability. The zinc oxide resistor comprises: zinc monoxide, bismuth trioxide, antimony trioxide, nickel trioxide, manganese tetroxide, cobalt tetroxide, tin dioxide, boron trioxide, nano-silver powder, aluminum nitrate nonahydrate, barium acetate, binder, dispersant, and deionized water. The zinc oxide resistor designed in this invention has the advantage of good stability under high gradient and high current flow, overcoming the degradation behavior of existing zinc oxide varistors caused by the influence of high current surge impact on the zinc monoxide grain boundary barrier, and is suitable for industrial application.

The invention provides a preparation method of a one-dimensional double-doped barium titanate ceramic filler PVDF-based composite material, and belongs to the technical field of dielectric materials. The preparation method comprises the following steps: uniformly mixing tetrabutyl titanate, zirconium acetylacetonate and an organic solvent to form a solution A, and uniformly mixing barium acetate, strontium acetate and deionized water to form a solution B; slowly adding the solution B into the solution A, carrying out a reaction step by step, and aging after the reaction is finished to obtain a wet gel-like ceramic precursor; thickening the ceramic precursor, and then performing electrostatic spinning to obtain a nanofiber membrane; calcining the nanofiber membrane, and then scattering the nanofiber membrane into nanorods; and mixing the nanorod and PVDF in an organic solvent, dispersing into a suspension, heating and stirring, and carrying out curtain coating and hot pressing to obtain the composite material. The composite material disclosed by the invention has relatively high comprehensive performance and has an important application prospect in the field of energy storage.

The invention belongs to the technical field of printed circuit board manufacturing, and particularly relates to a high-insulativity blind via hole PCB and a preparation method thereof. In preparation of the substrate, an inner chip layer, an epoxy resin glass cloth substrate and a copper foil are subjected to primary lamination to prepare a PCB daughter board, then drilling and copper plating are performed to prepare a blind hole, finally, secondary lamination is performed to prepare a PCB mainboard, hole sealing and curing are performed, a mark is subjected to silk-screen printing, detection and packaging are performed to prepare the high-insulativity blind via hole PCB, and the daughter boards are fully bonded through secondary lamination, so that the high-insulativity blind via hole PCB is obtained. 2-butyl long-chain alkyl groups are introduced into the insulating epoxy resin to improve toughness and impact resistance, and norbornene rigid groups are introduced to enable the insulating epoxy resin to effectively absorb internal stress; the preparation method comprises the following steps: preparing xerogel from tetrabutyl titanate and barium acetate through gelation, grinding and calcining to prepare insulating ceramic powder, and introducing an epoxy group through a kH-560 modified surface, so that the dispersity of an insulating medium filler in epoxy resin is improved, gradient heating curing is performed, and the insulating property of the high-insulating blind via hole PCB is improved.

The application provides a high-electric-field-induced-strain sodium bismuth titanate-based lead-free piezoelectric film, which has a general chemical formula of 0.9212(Bi 0.5 Na 0.5 )TiO3-0.0588BaTiO3-0.02La 0.7 Sr 0.3 MnO3. The application also provides a preparation method of the high-electric-field-induced-strain sodium bismuth titanate-based lead-free piezoelectric film, which comprises the following steps: S1, according to the stoichiometric ratio of the general chemical formula of the sodium bismuth titanate-based lead-free piezoelectric film, bismuth nitrate, sodium acetate, barium acetate, lanthanum acetate and strontium acetate are weighed and dissolved in acetic acid to prepare a first solution; S2, according to the stoichiometric ratio of the general chemical formula of the sodium bismuth titanate-based lead-free piezoelectric film, acetylacetone, tetrabutyl titanate and manganese acetate tetrahydrate are weighed and dissolved in ethylene glycol methyl ether to prepare a second solution; S3, the first solution and the second solution are mixed to obtain a mixed solution, and the concentration and the pH value of the mixed solution are adjusted to prepare a precursor solution; S4, a substrate is cleaned and dried; and S5, the precursor solution is coated on the substrate to prepare the high-electric-field-induced-strain sodium bismuth titanate-based lead-free piezoelectric film.

The application discloses orthogonal barium monoferrite nanofibers / rods and a preparation method and application thereof. The method is characterized in that barium acetate is used as a barium source, acetylacetone iron is used as an iron source, ethanol and acetic acid are used as solvents, polyvinylpyrrolidone is used as a wrapping and complexing stabilizer, and the orthogonal barium monoferrite is prepared and synthesized in an organic phase system by combining electrostatic spinning technology and a calcination process, so that the orthogonal barium monoferrite has high purity and regular nanofiber / rod morphology. The application has the advantages of simple operation steps, low cost, easy implementation, less use of test reagents, high yield of the prepared orthogonal barium monoferrite nanofiber / rod, and good stability.

The application discloses a core-shell type barium-cobalt@cerium oxide catalyst and a preparation method and application thereof. The preparation process of the barium-cobalt@cerium oxide catalyst is as follows: ammonia water is added dropwise into a mixed solution of citric acid, cerium nitrate, cobalt nitrate and barium acetate until the mixed solution is neutral, then the mixed solution is placed into an oil bath pot and heated and stirred until a sol-gel state is formed, and finally high-temperature calcination and reduction are carried out. The non-noble metal catalyst prepared by the sol-gel method can efficiently catalyze and promote hydrogen production by solar ammonia decomposition at low temperature, and has great industrial application significance.

The present invention belongs to the technical field of organic synthesis. Disclosed is a preparation method for bisphenol A bis(2-hydroxyethyl) ether. The specific steps of the preparation method are as follows: adding bisphenol A, a mixed acetate catalyst and a solvent into a reactor; starting stirring and performing replacement by nitrogen, raising the temperature to a reaction temperature, and then starting to feed ethylene oxide; after the addition of ethylene oxide is completed, maintaining the temperature and continuing the reaction until the pressure no longer decreases; cooling same to a desolventization temperature, performing desolventization until no more solvent comes out, then cooling same and degassing same, and discharging same to obtain the bisphenol A bis(2-hydroxyethyl) ether. The mixed acetate catalyst consists of calcium acetate, magnesium acetate and barium acetate; and the solvent is methyl cyclohexane. The preparation method of the present invention uses specific mixed acetates as a catalyst and methyl cyclohexane as a solvent, so that an excellent catalytic effect is achieved and the prepared bisphenol A bis(2-hydroxyethyl) ether is endowed with high purity, a low hydroxyl value and light color, and the solvent has low toxicity and is easy to recycle.