21 results about "Strontium nitrate" patented technology

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 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.

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.

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 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 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.

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 application discloses a strontium-doped inorganic nanofiber composite 3D printing scaffold for bone defect repair and a preparation method thereof, and belongs to the field of bone defect repair biomaterials. The preparation method comprises the following steps: dissolving strontium nitrate in a mixed solution of tetraethyl orthosilicate, phosphoric acid and deionized water, stirring and mixing the obtained SiO2-SrO sol with a PVA solution, electrospinning, high-temperature calcination, obtaining a SiO2-SrO nanofiber membrane, cutting small pieces, high-speed stirring and dispersing, adding deionized water, high-speed homogenizing, freeze-drying, mixing with deionized water, grinding and freeze-drying, obtaining SiO2-SrO nanofiber as a dispersed phase, magnetically stirring and uniformly mixing CS solution and HA solution as a continuous phase, fully mixing and uniformly mixing to obtain a biological ink, and then 3D printing, freeze-drying and ultraviolet sterilization of the obtained scaffold, and immersion in a crosslinking agent solution for crosslinking reaction. The application realizes macroscopic and microscopic double-layer repair functions of the scaffold by combining electrospinning with 3D printing, and is used for bone defect repair.

The invention discloses a broadband wave-absorbing composite material and a preparation method thereof, and particularly relates to the field of wave-absorbing materials. Comprising the following steps: preparing xanthan gum powder into a gel solution; the preparation method comprises the following steps: mixing lanthanum nitrate, strontium nitrate hexahydrate, cobalt nitrate hexahydrate, ferric nitrate nonahydrate and manganese chloride tetrahydrate in a solvent to obtain a metal salt precursor solution; mixing the gel solution with a metal salt precursor solution to obtain a mixed solution; injecting the mixed solution into a pre-freezing medium for pre-freezing to obtain pre-frozen particles; performing freeze drying on the pre-frozen particles to obtain a freeze-dried sample; and pyrolyzing the freeze-dried sample in an Ar atmosphere to obtain the wave-absorbing composite material. Through the method, the wave-absorbing composite material with low reflection loss and wide frequency band can be obtained.

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

The application relates to the field of gas fire extinguishing of fire-fighting equipment, and discloses a low-temperature and low-corrosion hot aerosol fire extinguishing medium, a preparation method and application thereof. The hot aerosol fire extinguishing medium comprises an oxidant and modified aluminum hydroxide, the oxidant is a mixture of strontium nitrate, potassium organic acid and chlorate, the content of silane groups in the modified aluminum hydroxide is 10-30 wt%, and the weight ratio of the oxidant to the modified aluminum hydroxide is 1:0.01-0.5. The hot aerosol fire extinguishing medium is stable in performance during combustion, can effectively reduce the combustion temperature, significantly improve the fire extinguishing efficiency, and simultaneously reduce the corrosiveness to electrical equipment.

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 present invention provides a highly insulating, low-corrosion pulsed aerosol extinguishing agent and a manufacturing process for it, wherein the extinguishing agent comprises the following components in mass proportions: 60-80 parts oxidizing agent, 10-30 parts reducing agent, 5-10 parts binder, 1-5 parts lubricant, and 1-5 parts auxiliary agent; wherein the auxiliary agent is polyacrylonitrile and / or polyvinylpyrrolidone; wherein the oxidizing agent is strontium nitrate; wherein the reducing agent is agarose and / or lignin; wherein the binder is furan resin or melamine resin; and wherein the lubricant is boron carbide. The extinguishing agent exhibits high strength, low density, and a high burning rate, which significantly improves its extinguishing ability and effectively reduces the required concentration of type S aerosol extinguishing agents.

This invention discloses a molybdenum-doped strontium titanate photochromic material, its hydrothermal synthesis method, and its applications. In the material, molybdenum exists in the strontium titanate lattice as a dopant, substituting for titanium sites, with a molar percentage of molybdenum to titanium ranging from 0.5% to 10%. The preparation method involves using strontium nitrate, butyl titanate, and ammonium molybdate as precursors to form a homogeneous solution in ethylene glycol solvent. After aging to obtain a dry gel, the solution is synthesized in one step via a hydrothermal reaction under alkaline conditions. This invention achieves stable bonding of molybdenum atoms in the crystal lattice through in-situ doping. Photoluminescence spectroscopy confirms that this structure effectively promotes the separation of photogenerated electron-hole pairs, thereby efficiently utilizing light energy for the photochromic reaction. The resulting material exhibits high contrast, excellent reversibility, and stable photochromic properties. This method is simple, requires a small amount of molybdenum, and has broad application prospects in fields such as photochromic anti-counterfeiting and information storage.

The invention discloses a guanidine nitrate gas production drug for an airbag and a preparation method thereof, the guanidine nitrate gas production drug comprises the following components by mass percentage: 45%-49% of guanidine nitrate, 19%-21% of potassium perchlorate, 24%-26% of strontium nitrate, 3%-5% of copper oxide, 3%-5% of polyvinyl alcohol, and 0.3%-0.5% of free-flowing auxiliary materials, and the sum of the mass percentage of the components is 100%. The obtained gas production medicine is large in gas production rate, stable in combustion performance, small in residue amount and low in sensitivity, and a direction is provided for developing miniaturized safety airbags and improving essential safety of medicine manufacturing; the preparation method effectively ensures the product quality and stability in the production process.

This invention discloses a highly insulating and low-hygroscopic thermal aerosol fire extinguishing agent and its preparation method, relating to the field of lithium-ion battery fire extinguishing agent technology. The key technical points include a redox system based on strontium nitrate and nitroguanidine, combined with a specific proportion of ammonium polyphosphate-melamine cyanurate-nano silica composite flame retardant, and the introduction of an additive. This additive is prepared by loading a mixture of methyltrimethoxysilane and octyltriethoxysilane onto a tin-doped mesoporous silica carrier. The effect is that when the fire extinguishing agent is released, the silane in the additive rapidly forms a highly insulating and hydrophobic siloxane network covering layer under the catalysis of tin ions. Simultaneously, the synergistic effect of the formulation and carrier structure endows the product with low hygroscopicity, ensuring stable performance in humid environments.