15 results about "Strontium acetate" patented technology

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%.

This invention discloses a method for preparing a strontium titanate modified layer on the surface of zirconia based on an impregnation-heat treatment method, comprising: (1) mixing titanium sulfate, urea and water to obtain a precursor liquid A, placing zirconia ceramic in the precursor liquid A, heating to boiling and maintaining for a period of time, then removing the zirconia ceramic, and after heat treatment A, preparing a titanium dioxide film on the surface of zirconia; (2) mixing H2O2 aqueous solution, ammonia and deionized water, adding metatitanic acid and stirring to dissolve, obtaining a precursor liquid B, placing the zirconia with the titanium dioxide film in the precursor liquid B, and allowing it to stand and react for a period of time at room temperature, depositing zirconia modified with a titanium dioxide precursor layer; (3) dissolving strontium acetate, or a mixed salt composed of calcium acetate and / or magnesium acetate and strontium acetate in deionized water to obtain an impregnation treatment solution, placing the zirconia modified with the titanium dioxide precursor layer in the impregnation treatment solution, allowing it to stand and react for a period of time, and then removing it, and after heat treatment B, preparing a strontium titanate modified layer on the surface of zirconia. The strontium titanate layer prepared on the surface of zirconia ceramic in this invention is tightly attached to the zirconia substrate and has high hydrophilicity, which is conducive to the adhesion of proteins and cells in the human body. At the same time, it can release active factors such as strontium ions for a long time to promote bone formation and bone regeneration at the implantation site, ultimately enhancing the osseointegration capacity of the zirconia implant.

The invention discloses an alkaline earth metal modified copper-based catalyst and a preparation method and application thereof in preparation of methanol by hydrogenation of carbon dioxide, and relates to the technical field of catalysts, the preparation method of the catalyst comprises the following steps: fully grinding and mixing strontium acetate, cupric acetate monohydrate, zinc acetate dihydrate, zirconium acetate and anhydrous oxalic acid, and drying at high temperature to obtain the alkaline earth metal modified copper-based catalyst. And carrying out high-temperature calcination for a period of time, and naturally cooling to obtain the product. And tabletting and granulating the product to obtain the alkaline earth metal modified copper-based catalyst. The alkaline earth metal modified copper-based catalyst provided by the invention has the advantages of good catalytic activity, high selectivity and the like in a reaction for preparing methanol through carbon dioxide hydrogenation; in a carbon dioxide hydrogenation process, the alkaline earth metal modified copper-based catalyst can obtain 6.2% of CO2 conversion rate and 93% of methanol selectivity at a low temperature of 160 DEG C.

The invention provides a preparation method of a catalyst for improving low-temperature ignition performance of gasoline car emission, and relates to the technical field of catalysts.The preparation method comprises the following steps that the surface of a metal honeycomb carrier substrate is sequentially coated with a bottom coating and an upper coating; the bottom coating comprises a composite cerium zirconium oxide, gamma-Al2O3, a noble metal active component Pt and / or Pd, hydrosol and strontium acetate; the upper coating comprises composite cerium zirconium oxide, gamma-Al2O3, at least two of precious metal active components Pt, Pd and / or Rh, hydrosol and strontium acetate; the catalyst has great advantages in the aspects of low-temperature light-off activity and pollutant conversion efficiency, the performance reliability and stability of the low-temperature light-off activity and the pollutant conversion rate are also shown when the usage amount of precious metal is reduced, the linkage effect is generated by optimizing the formula of the precious metal, the usage amount of the precious metal is reduced, and the cost is reduced. The purposes of improving the product performance, reducing the cost and saving expensive resources can be achieved.

The invention relates to the field of refractory materials, in particular to a La2O3-containing refractory material and a preparation method thereof. The problems that an existing refractory material is low in compression strength and breaking strength, poor in thermal shock resistance and high in apparent porosity are solved. The refractory material is prepared by taking calcium oxide, silicon dioxide, magnesium oxide, aluminum oxide, ferric oxide and lanthanum oxide as base materials and adding strontium cobalt aluminate to coat cerium magnesium aluminum chromium powder, and potassium chloride and sodium chloride are used as molten salts to prepare the cerium magnesium aluminum chromium powder through a dissolution-reprecipitation mechanism. Citric acid monohydrate, strontium acetate, cobalt nitrate hexahydrate and aluminum nitrate form a stable complex, strontium cobalt aluminate is obtained through high-temperature treatment, cerium-magnesium-aluminum-chromium powder is coated with the strontium cobalt aluminate through a first solution, the volume density, thermal shock resistance and mechanical strength of the refractory material are improved, and the strict requirements of high-temperature industry for the high-performance refractory material are met.

The invention relates to the field of oral care, in particular to a disposable tooth desensitization cotton swab and a preparation method and application thereof.The disposable tooth desensitization cotton swab comprises a hollow plastic cotton swab body, the cotton swab body is provided with two ends, each end is provided with an adsorption head, and one end is provided with a pre-breaking connecting point; the desensitization composition is stored in the hollow plastic cotton swab body, the desensitization composition comprises the following components: 3%-5% of strontium acetate, 0.1%-0.5% of zinc salicylate, 1%-3% of aminomethyl propanol, 5%-15% of glycerol, 1%-10% of butanediol, 0.1%-0.5% of a stabilizer, 0.05%-0.1% of a food-grade flavoring agent and the balance of purified water, and the desensitization composition is stored in the hollow plastic cotton swab body and is prepared by adopting a high-concentration strontium acetate and zinc salicylate composite formula through a dual-action mechanism. The tooth sensitivity symptom can be obviously relieved within 1-3 minutes after the toothpaste is used, and compared with the traditional desensitization toothpaste which needs to be continuously used for several weeks, the user experience is greatly improved.

The present invention discloses a preparation method of nitrogen-doped carbon-coated hollow porous strontium titanate, which specifically includes the following steps: dissolving tetrabutyl titanate in ethylene glycol to obtain solution A; dissolving strontium acetate in deionized water to obtain solution B; under magnetic stirring, dropwise adding solution A into solution B until uniformly dispersed, adding NaOH and hexamethylenetetramine into the above solution, stirring until completely dissolved, then carrying out hydrothermal reaction in a reaction kettle, then cooling to room temperature, washing and drying, and finally calcining the product in a tube furnace at 900-1200 °C. By a simple hydrothermal method, a nitrogen-doped carbon-coated hollow porous strontium titanate photocatalyst with uniform size, high performance and high stability is successfully prepared, with simple operation and novel structure; the introduction of hexamethylenetetramine effectively improves the specific surface area, sunlight utilization rate and carrier transport performance of strontium titanate; after nitrogen-doped carbon grows on the surface of strontium titanate, the structural stability is improved and the sunlight utilization rate is increased.

This invention relates to a transparent strontium fluoride ceramic based on low-temperature sintering, its preparation method, and its applications. The transparent strontium fluoride ceramic, by mass percentage, consists of 95-99% strontium fluoride matrix and 1%-5% thermosensitive luminescent material. The method of this invention uses a mild strontium acetate solution as a sintering aid, and successfully prepares a transparent strontium fluoride ceramic with a density greater than 99% and high optical transmittance under a low temperature of 100-150 °C and a uniaxial pressure of 300-400 MPa. The low-temperature sintering process of this invention avoids damage to the material from strong acids and alkalis, allows the thermosensitive luminescent material to be incorporated into the ceramic matrix during sintering, effectively preserving the excellent properties of the luminescent material and exhibiting excellent optical performance and encapsulation protection.

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 relates to drug-loaded hydrogel for treating cartilage injury and a preparation method of the drug-loaded hydrogel, and belongs to the technical field of biomedical materials. The drug-loaded hydrogel for treating cartilage injury comprises hydroxybutyl chitosan hydrogel, cartilage progenitor cell exosomes and strontium acetate, the cartilage progenitor cell exosomes and the strontium acetate are dispersed in the hydroxybutyl chitosan hydrogel, and the hydroxybutyl chitosan hydrogel has injectability and thermosensitivity capable of gelling at physiological temperature. According to the drug-loaded hydrogel for treating the cartilage injury, strontium and the cartilage progenitor cell exosome are encapsulated in the hydrogel, so that slow release of the strontium and the cartilage progenitor cell exosome is realized, and the strontium and the cartilage progenitor cell exosome have a synergistic effect; the effects of promoting the mesenchymal stem cells to be differentiated into cartilage and inhibiting the inflammation microenvironment after cartilage injury are jointly achieved, and repair and regeneration after cartilage injury can be effectively promoted.

The application discloses an alkaline earth metal modified copper-based catalyst and a preparation method and application thereof in carbon dioxide hydrogenation to prepare methanol, relates to the technical field of catalysts, and the preparation method of the catalyst comprises the following steps: fully grinding and mixing strontium acetate, copper acetate monohydrate, zinc acetate dihydrate and zirconium acetate with anhydrous oxalic acid, drying at high temperature, then high-temperature calcining for a period of time, and naturally cooling to obtain a product. The product is tabletted and granulated to obtain the alkaline earth metal modified copper-based catalyst. The alkaline earth metal modified copper-based catalyst provided by the application has the advantages of good catalytic activity and high selectivity in the reaction of carbon dioxide hydrogenation to prepare methanol; wherein in the process of carbon dioxide hydrogenation, the alkaline earth metal modified copper-based catalyst can obtain a CO2 conversion rate of 6.2% and a methanol selectivity of 93% at a low temperature of 160 DEG.

This invention discloses a strontium titanate photoanode film, its preparation method, and its application, comprising the following steps: Cleaning and drying conductive glass, then calcining it with the conductive side facing upwards; chelating tetrabutyl titanate with acetylacetone, adding it to a strontium acetate solution, stirring, then adding acetonitrile, continuing stirring for a set time, and aging to obtain a precursor solution; covering a pre-reserved area on the conductive surface of the calcined conductive glass with tape, then coating the conductive surface with the precursor solution layer by layer, calcining the conductive glass at 550-650℃ for 5-15 min after each layer is coated, and calcining the conductive glass at 550-650℃ for 0.8-1.2 h after coating, and obtaining the strontium titanate photoanode film after cooling. The prepared SrTiO3 photoanode film can not only be used for photoelectrocatalytic water splitting to produce oxygen, but can also be recycled and reused.

The application discloses a preparation method of a sodium bismuth titanate-strontium titanate-bismuth ferrite manganate ferroelectric film, and the chemical composition of the ferroelectric film is (1-x)Bi 0.35 Na 0.35 Sr 0.3 O3-xBiMnO3, and the molar component x is 0-0.10. The preparation method comprises the following steps: ①adding bismuth nitrate, sodium acetate, strontium acetate and manganese acetate into deionized water and an acetic acid solvent, stirring at 40-90 DEG C for 5-40 min, and obtaining solution A; ②adding tetrabutyl titanate into acetylacetone and ethylene glycol methyl ether solvents, stirring for 5-40 min, and obtaining solution B; ③mixing solution A with solution B, stirring for 5-40 min, and obtaining mixed solution C; and ④coating the mixed solution C on a Pt / Ti / SiO2 / Si substrate by a spin coating method, and obtaining a sodium bismuth titanate-based lead-free ferroelectric film after high-temperature treatment; the ferroelectric film is smooth and flat, has a typical perovskite structure, a very high polarization intensity and excellent piezoelectric performance, and especially, the remanent polarization intensity Pr is greatly 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 provides a preparation method of a strontium and graphite double-assisted titanium dioxide nanofiber photocatalyst, and comprises the following steps: strontium acetate is put into anhydrous ethanol and glacial acetic acid solvents, and stirred to make it completely dissolved; then butyl titanate is poured in, and stirred uniformly to form a clear solution; polyvinylpyrrolidone is slowly added, and continuously stirred until a light yellow transparent viscous electrospinning precursor solution is generated; the precursor solution is electrospun at room temperature; the collected nanofiber felt is put into air for calcination to form strontium-doped titanium dioxide nanofiber; the titanium dioxide nanofiber is subjected to hydrothermal treatment by using dimethylformamide and ammonia water, the precipitate is washed with water, and the strontium-doped titanium dioxide nanofiber is calcined in a protective gas, so that the graphite is attached to the surface of the titanium dioxide nanofiber without adhesive. The strontium and graphite double assistance improves the photocatalytic efficiency of the titanium dioxide, and the nanoscale titanium dioxide is easy to recycle.