68 results about "Strontium nitrate" patented technology

The invention belongs to the technical field of heating bodies, and particularly relates to a method for preparing a sheet-shaped heating body. The preparation method comprises the following steps: stirring and dissolving lanthanum nitrate, strontium nitrate, manganese nitrate hexahydrate and a solvent to obtain a metal salt solution; preparing the metal salt solution into a precursor, wherein the precursor is a precursor solution or precursor sol; and carrying out tape casting and drying on the precursor to obtain a biscuit sheet, and carrying out glue removal treatment and sintering on the biscuit sheet to obtain the sheet-shaped heating body. According to the preparation method, a precursor system is optimized, the dispersion stability of the precursor is improved, casting, drying and sintering processes are matched, the problem of powder agglomeration is solved, the defects of green bodies are reduced, the drying shrinkage rate of green body pieces in the preparation process is reduced, the surface roughness is reduced, the stability and heat output uniformity of a heating body are improved, and the compactness is improved.

The invention discloses a neodymium-zirconium co-substituted M-type strontium ferrite wave-absorbing material and a preparation method thereof, the chemical formula of the neodymium-zirconium co-substituted M-type strontium ferrite wave-absorbing material is Sr1-xNdxZr0. 2Fe11.8 O19, and x is more than or equal to 0.1 and less than or equal to 0.4. The method comprises the following steps: (1) mixing strontium nitrate, ferric nitrate nonahydrate, neodymium nitrate hexahydrate, zirconium nitrate pentahydrate, citric acid monohydrate and deionized water, stirring and dissolving to obtain sol; (2) adjusting the pH value of the sol to 6.5-7.5, and then heating to carry out sol-gel reaction to obtain wet gel; (3) drying and grinding the wet gel to obtain precursor powder; and (4) performing heat treatment on the precursor powder in a box-type furnace, cooling and grinding to obtain the neodymium-zirconium co-substituted M-type strontium ferrite wave-absorbing material. According to the material, effective wave-absorbing frequency band broadening is achieved, the matching thickness corresponding to the effective wave-absorbing bandwidth is as thin as 0.55-0.7 mm, and meanwhile, the performance requirements of thinness, width and strength in the field of electromagnetic compatibility are met.

The invention discloses a perovskite type composite metal oxide oxygen carrier catalyst as well as a preparation method and application thereof, and belongs to the field of biomass chemical chain gasification / reforming. The oxygen carrier catalyst is of a La, Fe and Ni co-doped SrTiO3 perovskite structure, and active components Fe and Ni are embedded into a main body SrTiO3 perovskite crystal phase structure in an oxide or simple substance form; the method comprises the following steps: preparing an aqueous solution of lanthanum nitrate, strontium nitrate, nickel nitrate, ferric nitrate and citric acid, adding a mixed solution of tetrabutyl titanate and ethylene glycol into the aqueous solution, heating in a water bath, and stirring to form gel; drying and calcining the gel to obtain intermediate powder; and the intermediate powder is oxidized and reduced to form a high-temperature crystal structure under different atmospheres, and the perovskite type composite metal oxide oxygen carrier catalyst is obtained. The oxygen carrier catalyst provided by the invention has high tar conversion rate and stable cycle activity in the biomass chemical chain gasification / reforming process.

The invention specifically discloses a method for determining the content of chromium, silicon, phosphorus and titanium in high-carbon ferrochrome, which adopts a melting sample preparation-X fluorescence spectrometry method for determination, and comprises the following steps: (1) sample preparation: uniformly mixing a sample with lithium hydroxide, boron oxide, strontium nitrate and other oxidants, covering with lithium tetraborate, setting a melting procedure, and determining the content of chromium, silicon, phosphorus and titanium in the high-carbon ferrochrome by controlling the heating rate, segmentally controlling the temperature and preserving the heat; the full-automatic completion of pre-oxidation and melting can be realized, and the homogeneous glass fuse piece meeting the analysis requirement is obtained; (2) preparing a calibration working curve sample: selecting various national standard samples to establish a calibration working curve; and (3) determining by using an X-ray fluorescence spectrophotometer. According to the method provided by the invention, a flux crucible does not need to be additionally prepared for early-stage sample treatment, complete sample melting is ensured, the platinum-yellow crucible is prevented from being etched, the homogeneous glass fuse piece meeting the analysis requirement is obtained, and the precision and the accuracy of the result both meet the use requirement.

The invention belongs to the field of ferrite materials, and particularly relates to a high-coercivity strontium ferrite with iron partially replaced by aluminum and a preparation method of the high-coercivity strontium ferrite. Aiming at the problem of low coercive force of a ferrite pre-sintering material in the prior art, iron is partially replaced by aluminum, ferric nitrate, strontium nitrate, aluminum nitrate and glucose are used as reaction raw materials, the ratio of the total molar weight of Fe and Al to the molar weight of Sr is (9.5-12): 1, the ratio of the molar weight of Al to the total molar weight of Fe and Al is (0-0.41): 1, and the molar weight of glucose is 0.5-3.5 times of the total molar weight of Fe, Al and Sr; and calcining at 900-1200 DEG C for 1-3 hours by adopting a solution self-combustion-aluminum ion substitution method to prepare the strontium permanent magnetic ferrite powder material with high coercivity.

The invention discloses a production method of a nitroguanidine-containing gas production medicine for an air bag restraint system, which specifically comprises the following steps of: measuring moisture of wet nitroguanidine and calculating feeding weight; screening strontium nitrate; preparing a polyvinyl alcohol solution; feeding the wet nitroguanidine and the fine strontium nitrate into a mixing granulator according to the calculated feeding weight, mixing, adding a polyvinyl alcohol solution, uniformly mixing, granulating to obtain mixed particles, drying, screening, mixing, and pressing to prepare the gas production tablet for the safety airbag. The risk degree and the essence existing in the production process of the gas-producing medicament are reduced; and the production safety of the medicament is improved. The invention further discloses the nitroguanidine-containing gas production medicine for the air bag restraint system, the nitroguanidine-containing gas production medicine is produced by adopting the production method for the nitroguanidine-containing gas production medicine for the air bag restraint system, and the stability of the performance of the gas production medicine is improved.

The invention provides a lead salt modified 5-aminotetrazolyl gas generating agent with low combustion temperature and high combustion rate and a preparation method thereof, the gas generating agent comprises 5-aminotetrazole, strontium nitrate and lead salt, and the mass ratio of the lead salt is 5-10%. According to the invention, the 5-aminotetrazolyl gas generating agent is modified, so that the temperature of the gas generating agent can be reduced, the burning speed can be improved, and the applicability of the gas generating agent as a solid propelling type fire extinguishing device is enhanced.

A preparation method and application of an iron-gold / oxygen-deficient strontium titanate one-dimensional hollow nanotube composite photocatalyst, which relates to a preparation method and application of a photocatalyst. The present invention is to solve the problem that the prior art prepares a strontium titanate-based composite photocatalyst with low photogenerated carrier separation efficiency and lacks methane adsorption sites and catalytic active centers for activating oxidants. In the present invention, strontium ions in strontium nitrate are first coordinated with a complexing agent acetylacetone to form a strontium acetylacetonate intermediate, and then reacted with tetrabutyl titanate to form a strontium titanate precursor, and then the precursor solution is electrostatically spun in combination with subsequent calcination treatment to form a strontium titanate one-dimensional hollow nanotube, and then a sodium borohydride vacuum hydrogen reduction treatment is performed to obtain a strontium titanate one-dimensional hollow nanotube with surface oxygen defects, and finally a step-by-step freezing photoreduction method is used to induce metal gold and iron to be modified on the surface of oxygen-deficient strontium carbonate to obtain an iron-gold / oxygen-deficient strontium titanate one-dimensional hollow nanotube composite photocatalyst.

The invention relates to the technical field of tunnel construction, and particularly discloses a high-energy gas fracturing device which comprises an electric ignition head, a charging paper bag and a gas producing agent filled in the charging paper bag. One end of the electric igniter is fixed at the bottom center of the charging paper bag, and the other end penetrates through the charging paper bag and extends out; the gas production powder is ignited through the electric ignition head, the gas production powder is combusted to generate high-energy gas, and the restraining body around the powder containing paper bag is fractured; wherein the gas production medicine is prepared from 5-aminotetrazole, FOX12, an oxidizing agent strontium nitrate and a process additive.

The present invention belongs to the technical field of anti-icing materials, and particularly relates to a manganese ferrite magnetic nanoparticle, a preparation method and an application thereof. The molecular formula of the manganese ferrite magnetic nanoparticle prepared by the present invention is La x Ca y Sr z MnO3; wherein X = 0.1 - 0.7, Y = 0.1 - 0.35, Z = 0 - 0.16, and it is made of the following materials in parts by weight: 10 - 70 parts of lanthanum nitrate, 10 - 35 parts of calcium nitrate, 2 - 10 parts of strontium nitrate, and 30 - 50 parts of manganese nitrate.

The invention discloses a preparation method and application of anhydrite-celestite solid solution. A calcium nitrate solution and a strontium nitrate solution are prepared into a mixed solution according to different proportions, and a sodium sulfate solution is used as a precipitator. Strontium-containing gypsum is generated through a coprecipitation method, and after calcination, anhydrite-celestite series solid solutions are obtained. During application, a proper amount of anhydrite-celestite series solid solution is taken and placed in three different aqueous solutions at room temperature to be dissolved, and the distribution rule of the strontium-containing sulfate solid solution in the aqueous solutions is explored. The anhydrite-celestite series solid solution obtained by the method has the advantages of mild reaction conditions, easily available raw materials, high crystallinity and the like. Wherein in the coprecipitation experiment process, the removal rate of strontium in the mixed solution is close to 100%.

This invention discloses a method for preparing an electrically pulsed perovskite oxygen evolution reaction (OER) catalyst. The method involves overlapping electrodes on both sides of an SRIO thin film prepared from strontium nitrate, ruthenium oxide, and iridium oxide. Under an argon atmosphere, the SRIO thin film is subjected to a 2-second electrical pulse treatment via an external voltage source, with an electric field strength of 40 V / cm. This invention utilizes ruthenium oxide and iridium oxide powders as ruthenium and iridium sources, making it easier to obtain high-purity SRIO@E catalysts. This provides significant guidance for the synthesis of noble metal-based perovskite materials. Through a simple and easy-to-implement electrical pulse treatment strategy, this invention can remove some oxygen atoms from the catalyst, increasing the number of unpaired electrons available for the catalytic reaction and improving reaction activity. Furthermore, this electrical pulse treatment strategy is simple and controllable, has universal applicability, and is expected to meet the needs of industrial production.

The invention discloses a black quartz glass material and a preparation method thereof, and relates to the technical field of quartz glass preparation, the black quartz glass material is prepared from the following raw materials by weight: 0.8 wt%-3.8 wt% of a trace element additive, 0.01 wt%-0.05 wt% of a fluxing agent, and the balance of high purity quartz sand; the trace element additive is prepared from the following components in parts by weight: 0.03 to 0.05 part of strontium nitrate, 1 to 3 parts of titanium nitrate, 1 to 2 parts of manganous nitrate, 2 to 3 parts of ferric nitrate, 0.1 to 0.3 part of soluble rare earth salt, 0.05 to 0.1 part of nickel nitrate, 0.03 to 0.05 part of chromic nitrate, 0.05 to 0.08 part of niobium oxalate and 0.03 to 0.05 part of tantalum chloride. The glass material is good in color uniformity, stable in optical performance, simple in preparation process and low in thermal expansion coefficient.

The application provides a method for removing water from industrial-grade dimethyl carbonate by using a hydrophilic molecular sieve; aims to provide a molecular sieve with good water absorption performance and stability, a preparation method with high efficiency, safety, green environmental protection, and a method for preparing the hydrophilic molecular sieve on a large scale; the method comprises the following steps: dispersing potassium hydroxide and aluminum hydroxide into a solvent, adding strontium nitrate and silica sol to obtain a reaction liquid A, moving the reaction liquid A into a polytetrafluoroethylene-lined stainless steel reaction kettle, and reacting at 80-140 DEG C for 20-24 h to obtain a product hydrophilic molecular sieve; then the molecular sieve is soaked in a silver nitrate solution to obtain a silver-modified molecular sieve; and belongs to the technical field of fine chemical industry.

The present invention discloses a cathode material, a preparation method thereof and an application, belonging to the technical field of solid oxide fuel cells. The chemical formula of the cathode material is (Sr2Fe 1.5 Mo 0.38 P 0.12 O 6‑δ ) 0.9 [Sr3(PO4)2] 0.1 . The preparation method includes the following steps: S1: Weigh raw materials strontium nitrate, iron nitrate, ammonium molybdate, ammonium dihydrogen phosphate, glycine and citric acid; S2: Add deionized water to the raw materials, heat and stir to form a gel; S3: Treat the gel at 240-260 °C for 1.5-2.5 h to obtain a precursor; S4: Calcinate the precursor at 1000-1200 °C for 4-6 h to obtain the product. By introducing a proton-conducting phase into the electrode material through a simple and easy-to-operate self-assembly method, the electrochemical performance and stability of the electrode material are improved, and the problems of low electrochemical activity, cumbersome preparation process and poor stability of the cathode material of solid oxide fuel cells are solved.

The application discloses an anti-sintering methanol cracking catalyst and a preparation method thereof, and belongs to the field of hydrogen production by methanol cracking catalysis. The anti-sintering methanol cracking catalyst comprises the following raw materials in parts by weight: strontium nitrate 1.8-3 parts, titanium nitrate 6.3-10.5 parts, a Cu active carrier 58-70 parts and polyvinyl alcohol 2-5 parts. The Cu active carrier comprises the following raw materials in parts by weight: copper acetate 12-21 parts and a Zr-HAP-P2O7 carrier 51-60 parts. The Zr-HAP-P2O7 carrier comprises the following raw materials in mole fractions: calcium nitrate 19-22 parts, zirconium nitrate 1.8-2.5 parts, ammonium dihydrogen phosphate 18 parts and sodium pyrophosphate 1.4-1.7 parts. The methanol cracking catalyst provided by the application has strong anti-sintering capacity, can effectively prevent the generation of carbon deposition and prolong the service life of the catalyst.

This invention discloses a color-difference-free, uniformly luminescent concrete and its preparation method. Addressing the problems of easy hydrolysis and sedimentation of luminescent powder in alkaline cement, and the significant reduction in luminescence efficiency due to physical coating, the invention uses white silicate cement, refined quartz sand, uncoated rare-earth-doped strontium aluminate luminescent powder, and rutile titanium dioxide as the base mixed raw materials. During preparation, a multi-component liquid phase containing sodium polyacrylate, sodium gluconate, sodium aluminate, strontium nitrate, polyvinyl alcohol, and sodium tetraborate is added to the slurry in a stepwise manner and stirred. This invention utilizes the interfacial adsorption and local common ion effect of sodium polyacrylate to construct a thermodynamically balanced microenvironment around the luminescent powder, preventing hydrolysis. Simultaneously, the cross-linking of polyvinyl alcohol and sodium tetraborate forms an in-situ transient rheological network to prevent luminescent powder sedimentation. As cement hydration proceeds, the gel automatically disintegrates, and titanium dioxide approaches the luminescent interface, generating light scattering to eliminate color difference. High-brightness, uniform luminescence in concrete can be achieved without physical coating.

An easily-demolded high-insulation low-corrosion condensed aerosol fire extinguishing agent and a preparation method therefor. Strontium nitrate and potassium nitrate are jointly used as an oxidizing

This invention relates to a desensitizing drug for tooth enamel repair and its preparation method, belonging to the field of biomedical technology. The drug comprises a specific ratio of paeonol-dopamine modified chitosan quaternary ammonium salt, enzyme-responsive precursor mineral, polyethylene glycol didopamine modified hydroxyapatite, strontium nitrate, hyaluronic acid-maleimide, L-cysteine, and carbomer. The paeonol-dopamine modified chitosan quaternary ammonium salt is obtained by modifying chitosan quaternary ammonium salt with paeonol and dopamine hydrochloride under tyrosinase catalysis. The enzyme-responsive precursor mineral is obtained by coating nano-calcium pyrophosphate with ε-polylysine. The polyethylene glycol didopamine modified hydroxyapatite is obtained by surface adhesion modification of hydroxyapatite with polyethylene glycol didopamine. This invention yields a restorative desensitizing gel with strong adhesion and enzyme responsiveness. This gel can form a long-lasting protective layer on the tooth surface, simultaneously achieving the triple effects of physical sealing, nerve inhibition, and active mineralization.

The present invention relates to the technical field of anti-icing materials, and in particular to a manganese ferrite magnetic nanoparticle, preparation method and application thereof. The manganese ferrite magnetic nanoparticle prepared by the present invention is LaxCaySrzMnO3, wherein X=0.1-0.7, Y=0.1-0.35, and Z=0-0.16; and is prepared from the following materials, comprising, in parts by weight: 10-70 parts of lanthanum nitrate, 10-35 parts of calcium nitrate, 2-10 parts of strontium nitrate, and 30-50 parts of manganese nitrate.

The invention provides a perovskite-like cathode material, a symmetric cell and a preparation method, and relates to the technical field of fuel cells. The preparation method of the perovskite cathode material comprises the following steps: dissolving bismuth nitrate pentahydrate into deionized water dripped with dilute nitric acid to obtain a first solution; dissolving lanthanum nitrate hexahydrate, strontium nitrate and copper nitrate trihydrate into the first solution to obtain a second solution; adding citric acid and ammonia water dissolved with ethylenediamine tetraacetic acid into the second solution to obtain a third solution; heating the third solution to obtain sol; drying the sol to obtain a cathode precursor; and roasting the cathode precursor to obtain the perovskite-like cathode material. The performance of the perovskite-like cathode material can be improved.

The application provides a self-igniting fire extinguishing agent and application thereof, and has the characteristics that the self-igniting fire extinguishing agent comprises the following raw material components in parts by weight: 50-60 parts of potassium nitrate, 5-10 parts of strontium nitrate, 5-10 parts of 5-amino tetrazole, 5-10 parts of azodicarbonamide, 5-10 parts of dicyandiamide, 5-10 parts of melamine, 5-10 parts of phenolic resin, 5-10 parts of shellac resin, 5-10 parts of potassium bicarbonate, 1-5 parts of nitrocellulose and 1-10 parts of vermiculite powder. The self-igniting fire extinguishing agent is applied to fire extinguishing products such as fire extinguishing ropes and fire extinguishing sheets, and has the characteristics of large fire extinguishing range, fast ignition, low-temperature ignition (about 180 DEG C), complete reaction, low turbidity of fire extinguishing gas, low cost, passive temperature-sensing multiple fire extinguishing and the like.

The application discloses a preparation method of mesoporous strontium titanate material, which comprises the following steps: dissolving amphiphilic block copolymer and tetrabutyl titanate in N,N-dimethylformamide respectively, stirring to obtain solution A; dissolving strontium nitrate in deionized water, stirring to obtain solution B, mixing solution A with solution B, stirring to obtain light yellow transparent colloidal solution C; transferring and evaporating the light yellow transparent colloidal solution C, drying and solidifying to obtain an organic-inorganic composite film, and grinding to obtain a powder; and calcining the powder at 450-650 DEG C under a protective gas and then at 350-500 DEG C under an air atmosphere. The application further discloses the mesoporous strontium titanate obtained by the preparation method and application of the mesoporous strontium titanate in photocatalytic production of H2O2. The application can prepare 40 nm mesoporous strontium titanate material, and has the advantages of simple and convenient preparation method, low cost, and the like. The amount of H2O2 produced by photocatalysis reaches 95.2 muM (1 hour), which breaks through the bottleneck value of the prior art.

The invention discloses a Sr2Si5N8:Eu 2+ The spray pyrolysis synthesis method of nanoparticles comprises the following steps: step 1: weighing 49 mmol strontium nitrate; 125 mmol tetraethyl orthosilicate; 1 mmol europium nitrate; 400 mmol urea; dissolving the above precursors in 250 mL deionized water to form a uniform precursor solution; step 2: using an atomizer to atomize the precursor solution obtained in step 1; spraying the atomized solution into a high-temperature furnace maintained at 1000° C.; using argon gas with a flow rate of 1 L / min as a carrier gas to promote decomposition and reaction to form Sr2Si5N8:Eu 2+ Particles; Step 3: Use a fiber filter to collect the nanoparticles formed in step 2; Step 4: Rinse the collected nanoparticles three times with deionized water; Step 5: Calcine the nanoparticles treated in step 4 at 1200°C for 2 hours in an argon environment. To synthesize Sr2Si5N8:Eu with higher crystallinity, better luminescence intensity, stronger light absorption and light conversion capabilities 2+ Nanoparticles.

This invention relates to a preparation process for a heavy metal-free environmentally friendly aerosol agent. The aerosol agent is composed of the following raw materials in parts by weight: 10-60 parts perfluoroacetone, 20-50 parts potassium nitrate, 1-4 parts magnesium nitrate, 1-14 parts melamine, 4-15 parts dicyandiamide, 2-12 parts phenolic resin, 2-10 parts hexamethylenetetramine, 2-9 parts water-soluble polymer modified powder, 2-5 parts polyol composite igniter, 1-4 parts sucrose, 0.2-3 parts magnesium stearate, 0.1-2 parts composite lubricant, and 3-12 parts composite inorganic combustion aid and cooling agent. This technical solution completely eliminates heavy metal raw materials such as strontium nitrate and barium nitrate, and adopts a heavy metal-free composite formula. It leaves no toxic heavy metal residues after combustion, fully complies with REACH and SVHC global export environmental control standards, and has a wider range of applications. The copolymerization of phenolic resin and water-soluble polymer modified powder forms a high-density moisture-proof and antioxidant adhesive film, which effectively solves the problems of moisture absorption, oxidation, red spots, and cracking of traditional agents.

The application discloses a lithium-carbon fluoride battery electrolyte and application, and belongs to the technical field of lithium / carbon fluoride primary batteries. The lithium-carbon fluoride battery electrolyte comprises lithium salt, solvent and NO3 ‑ additive; the solvent comprises high dielectric constant solvent, ether solvent and nitrogen heterocyclic crown ether solvent; the NO3 ‑ additive is at least one of lithium nitrate, copper nitrate, ammonium nitrate, potassium nitrate, sodium nitrate, barium nitrate, zinc nitrate, lead nitrate, nickel nitrate, magnesium nitrate, calcium nitrate, strontium nitrate and cesium nitrate; the NO3 ‑ additive has a mass fraction of 5% to 20%. The high-concentration nitrate additive is introduced to form a protective layer on the surface of the lithium metal negative electrode, thereby inhibiting the side reaction of the lithium metal and the solvent and accelerating the Li + transporting effect, thereby reducing the polarization phenomenon during battery discharging; the nitrogen heterocyclic crown ether can promote the dissolution of the high-concentration nitrate and the lithium fluoride of the positive electrode in the battery discharging process, reduce the polarization of the battery and improve the energy density of the battery.

The invention provides a cathode material, a proton ceramic reactor, preparation and application in ammonia synthesis, and the cathode material and the proton ceramic reactor are prepared by the following steps: dissolving raw materials in distilled water under heating and stirring conditions to form a solution; the raw materials comprise strontium nitrate, ferrous nitrate nonahydrate, ammonium heptamolybdate tetrahydrate, ruthenium nitrosyl nitrate, citric acid and glycine; then adjusting the pH value of the solution to 7 + / -0.5 to promote the formation of a complex, and maintaining a heating and stirring state to gradually evaporate water to obtain a gel; and drying and calcining to obtain the cathode material Sr2Fe1. 5Mo0.5-xRuxO6-delta, x is more than 0 and less than 0.1, and delta is the oxygen vacancy content. When the cathode material is applied to a proton ceramic reactor, the catalytic activity of the cathode of the reactor can be remarkably improved, and efficient nitrogen reduction reaction ammonia synthesis under the medium-temperature condition suitable for industrial application is realized.

This invention relates to a compound strontium borate nitrate and a strontium borate nitrate nonlinear optical crystal, as well as their preparation methods and uses. The chemical formula of the compound is Sr3B9O. 16 (NO3), with a molecular weight of 678.16, was prepared using a vacuum-sealed tube method; the chemical formula of this crystal is Sr3B9O. 16 (NO3), with a molecular weight of 678.16, belongs to the monoclinic crystal system and has a space group of Cc The unit cell parameters are a =11.2574(9)Å, b =6.6400(9)Å, c =18.1027(13)Å, Z=4, V=1348.9(2)Å 3 It is prepared using a high-temperature melt method or hydrothermal method under vacuum sealing conditions. Its nonlinear optical effect is approximately three times that of KDP, and its birefringence is 0.088@546 nm. This method has advantages such as simple preparation, short growth cycle, low toxicity of starting materials, and minimal harm to humans. Sr3B9O obtained by the method described in this invention... 16 (NO3) Nonlinear optical crystals have stable physicochemical properties, large nonlinear effects, and can be applied to phase-matching wavelengths in the ultraviolet band. They can be widely used in nonlinear optical devices such as frequency doubling converters and optical parametric oscillators.

The invention discloses a preparation method of a Bi-2212 superconducting film based on a polymer-assisted deposition method, relates to the technical field of semiconductor manufacturing, and solves the problems of poor precursor stability, complex process, long period, high cost, limited component control precision and non-uniform coating in the traditional technology. The preparation method comprises the following steps: preparing a precursor sol by taking bismuth nitrate pentahydrate, strontium nitrate, calcium nitrate tetrahydrate and copper nitrate trihydrate as ion sources, taking ethylenediamine tetraacetic acid as a complexing agent and taking polyethyleneimine as a high-molecular polymer, spin-coating the precursor sol on a LaAlO3 (001) substrate to prepare a sol film, and carrying out multi-stage heat preservation heat treatment and drying to obtain the Bi-2212 superconducting thin film. The Bi-2212 superconducting thin film prepared by the invention has relatively high phase purity and good superconductivity, the stoichiometric ratio of the raw materials can be accurately controlled, the preparation process is simple, the production equipment is less, the efficiency is high, the production cost is low, and the Bi-2212 superconducting thin film has great industrialization potential.

The invention discloses an anti-sintering methanol cracking catalyst and a preparation method thereof, and belongs to the field of methanol cracking catalytic hydrogen production. The anti-sintering methanol cracking catalyst is prepared from the following raw materials in parts by weight: 1.8 to 3 parts of strontium nitrate, 6.3 to 10.5 parts of titanium nitrate, 58 to 70 parts of Cu active carrier and 2 to 5 parts of polyvinyl alcohol, the Cu active carrier is prepared from the following raw materials in parts by weight: 12 to 21 parts of cupric acetate and 51 to 60 parts of Zr-HAP-P2O7 carrier; the Zr-HAP-P2O7 carrier is prepared from the following raw materials in parts by mole: 19 to 22 parts of calcium nitrate, 1.8 to 2.5 parts of zirconium nitrate, 18 parts of ammonium dihydrogen phosphate and 1.4 to 1.7 parts of sodium pyrophosphate. The methanol cracking catalyst provided by the invention has strong anti-sintering capability, can effectively prevent generation of carbon deposition, and prolongs the service life of the catalyst.