49 results about "Magnesium acetate" patented technology

The invention relates to the technical field of biological detection, and discloses a mycoplasma pneumoniae nucleic acid rapid detection method, which comprises the following steps: mixing a sample to be detected with a multifunctional pretreatment buffer solution containing tris (hydroxymethyl) aminomethane, potassium acetate, polyethylene glycol, saponin, spermine tetrahydrochloride and tris (2-carboxyethyl) phosphine hydrochloride, and carrying out cracking treatment; a cracking mixed solution is obtained; redissolving the enzymatic isothermal amplification basic reagent, the specific primer and the probe to obtain a redissolving amplification system; sucking the supernatant of the cracking mixed solution, adding the supernatant into a redissolving amplification system, and adding a magnesium acetate solution to obtain a reaction mixed solution to be detected; and carrying out isothermal amplification and signal acquisition to obtain a detection conclusion. The multifunctional pretreatment buffer solution is used for cracking the to-be-detected sample, sample liquefaction, cracking and nucleic acid release are completed in a single system, the nucleic acid extraction and purification step of centrifugal column adsorption or magnetic bead elution is avoided, and the operation process is simplified.

The invention relates to the technical field of biological analysis and detection, and particularly discloses a streptococcus mutans detection kit based on an anchored CRISPR-Cas12a enhanced paper-based micro-fluidic chip and a detection method. The detection kit comprises an RAA solution or RAA freeze-dried powder, magnesium acetate or a magnesium acetate solution, TMB or a TMB solution, an RAA forward primer, an RAA reverse primer, a cell lysis buffer, a buffer system and a paper-based micro-fluidic chip. The detection method comprises the following steps: establishing a standard curve and detecting a sample. The detection kit is used for detecting the content of streptococcus mutans and has the characteristics of high efficiency, rapidness, specificity, sensitivity, portability and the like, and the method is simple and convenient to operate, low in detection cost and capable of being applied to on-site detection of streptococcus mutans.

The invention belongs to the technical field of biology, and particularly discloses a chicken semen cryopreservation solution and a preparation method thereof. The chicken semen cryopreservation liquid comprises a cryoprotection liquid I and a cryoprotection liquid II. The freezing protection liquid I is prepared from the following components: glucose, sodium glutamate, potassium acetate, dipotassium phosphate, magnesium acetate, N, N-bis (2-ethoxyl)-2-aminoethanesulfonic acid and an antibiotic solution. And the freezing protection liquid II comprises dimethylformamide and nano zinc oxide. The invention discloses a chicken semen cryopreservation solution and a preparation method thereof, by applying the chicken semen cryopreservation solution, the fertilization and incubation performance of frozen semen is remarkably improved, centrifugation-free and direct semen deposition of the frozen semen are realized, and physical damage and activity reduction caused by the centrifugation process to sperms are avoided.

The application provides a method for preparing calcium-magnesium acetate environment-friendly snow-melting corrosion inhibitor from chlor-alkali salt mud solid waste, and belongs to the technical field of comprehensive utilization of solid waste and organic material synthesis. Firstly, the chlor-alkali salt mud is prepared into slurry with water, then under the action of acidification aid and ionic liquid, the acetate is added at one time, and then the calcium-magnesium acetate environment-friendly snow-melting corrosion inhibitor is precipitated in the alcohol precipitation solution. The method can achieve 84.13-87.26% of the utilization rate of the salt mud, 95-99.99% and 85-92% of the extraction rates of Ca 2+ and Mg 2+ in the salt mud respectively, basically realizing the full recovery of high-value components in the salt mud. The precipitation rates of Ca 2+ and Mg 2+ in the solution are 96.4-99.9% and 96.6-99.9% respectively, basically realizing the full precipitation of Ca 2+ and Mg 2+ , the product yield reaches 96.5-99.9%, the whiteness of the product reaches more than 98.0, no waste liquid is generated in the whole process, and the recycling of the salt mud solid waste is realized.

The invention provides a method and system for continuously preparing trifluoroiodomethane, and the method comprises the following steps in the same reactor: S1, inputting trifluoromethane, iodine vapor and air into the reactor, and reacting under the action of a catalyst to prepare trifluoroiodomethane; s2, when the reduction amplitude of the reaction yield relative to the initial reaction yield reaches a set threshold value, stopping inputting trifluoromethane and iodine vapor into the reactor, and continuously introducing air to regenerate the catalyst; and S3, after the regeneration of the catalyst is completed, repeatedly executing the steps S1 to S2. The preparation process of the mesoporous carrier used by the catalyst comprises the following steps: dispersing nano SiO2 spheres in a magnesium acetate or aluminum acetate solution, then adding an NH4F solution, and reacting under a stirring condition to obtain a mesoporous carrier precursor; and treating the mesoporous carrier precursor by adopting a solution etching method. According to the method for continuously preparing trifluoroiodomethane, the service life of the catalyst is long, the technological process is simple and efficient, and the regeneration difficulty of the catalyst is reduced.

The invention discloses a method for preparing compact fine-grain magnesium aluminate spinel ceramic by low-temperature sintering, which comprises the following steps: S1, mixing ethanolamine, magnesium acetate tetrahydrate and water according to a certain proportion to obtain a mixed solution A; s2, mixing citric acid, aluminum isopropoxide and water according to a certain proportion to obtain a mixed solution B; s3, slowly adding the mixed solution A into the solution B in the step S2 to form uniform colloid; s4, drying the colloidal solution to obtain a dried precursor; s5, performing low-temperature calcination on the precursor to obtain nano magnesium aluminate spinel powder; s6, carrying out ball milling and spray granulation to obtain spherical granulation powder with uniform particle size; s7, performing dry pressing molding and cold isostatic pressing molding to obtain a to-be-sintered ceramic biscuit; and S8, sintering in a muffle furnace to obtain the final magnesium aluminate spinel ceramic. The powder is subjected to ball milling, spray granulation, dry pressing forming and cold isostatic pressing forming, and then the compact fine-grain magnesium aluminate spinel ceramic is prepared through low-temperature sintering.

This invention discloses a reaction tube for recombinase polymerase amplification (RPA), belonging to the field of nucleic acid detection. The reaction tube of this invention includes a tube body and a cap separate from the tube body. The tube body contains lyophilized bulbs or lyophilized powder containing premixed nucleic acid detection reagents, and the cap contains lyophilized powder containing an activator. The tube body and cap are sealed with a thin film. The lyophilized bulbs or lyophilized powder containing the premixed nucleic acid detection reagents include: recombinase, single-stranded DNA-binding protein, strand displacement DNA polymerase, buffer components, ATP, ATP regeneration components, and dNTPs. The lyophilized powder containing the activator includes: potassium ions, magnesium ions, and polyethylene glycol. This invention enables magnesium acetate to stably adhere to the cap, solving the problem of easy spillage of the lyophilized activator in the cap. In use, only the nucleic acid of the sample to be tested needs to be added; the operation is simple, easy to promote and apply, and suitable for batch detection.

The application belongs to the technical field of concrete admixtures, and provides a polycarboxylic high-performance water-reducing agent powder concentration process, in which a high-functionality polycarboxylic ether copolymer aqueous solution with polyoxyethylene side chains, carboxyl groups and sulfonic acid groups is prepared from polyethylene glycol methyl ether methacrylate, acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid copolymerization, then magnesium acetate tetrahydrate is used for partial neutralization to form reversible magnesium carboxylate ion clusters, and the product is dehydrated, cooled into pieces and crushed and classified by a wiped-film evaporator or a falling-film evaporator to obtain a powder concentration product. The obtained product has a moisture content of 0.2-2.0 wt%, a glass transition temperature of 45-65 DEG C and a volume median particle size D50 of 60-150 mu m, and solves the problem that storage stability and redispersibility, processing fluidity and water-reducing performance are difficult to be considered in the powderization process, and is suitable for storage, transportation and application.

The invention belongs to the field of metal-organic framework (MOF) material synthesis, and discloses a method for preparing a UTSA-16 material through two-step ball milling and a product. The method comprises the following steps: putting citric acid and potassium hydroxide into a ball mill for ball milling; adding metal acetate into the ball mill, mixing the metal acetate with the obtained product, carrying out ball milling again, and then washing and drying the obtained product to obtain a UTSA-16 material; the metal acetate is zinc acetate or a combination of zinc acetate and one of cobalt acetate, magnesium acetate and copper acetate. According to the efficient and green method for preparing the high-quality UTSA-16 material, citric acid and potassium hydroxide are subjected to ball milling to prepare potassium citrate, then mechanical energy generated by ball milling is utilized again to promote the potassium citrate and metal acetate to be subjected to a coordination reaction, the ion concentration in the raw materials in the reaction process is higher, and the yield is higher. The method has the advantages of high synthesis efficiency, high yield and the like, and the preparation process has the advantages of mild reaction conditions, low energy consumption, greenness, high efficiency and the like.

The invention relates to the technical field of snow-melting agents, and particularly discloses an environment-friendly snow-melting and deicing composition and a preparation method thereof. The environment-friendly snow-melting and deicing composition comprises organic acid salt sustained-release microspheres, the organic acid salt sustained-release microsphere comprises a core material and a shell layer wrapping the core material, and according to the total weight of the organic acid salt sustained-release microsphere, the core material comprises the following raw materials in parts by weight: 30-45 parts of calcium magnesium acetate, 10-20 parts of sodium formate, 15-25 parts of potassium acetate, 8-15 parts of urea, 1-3 parts of a surfactant and 2-5 parts of a corrosion inhibitor; the shell layer is prepared from the following raw materials in parts by weight: 5 to 8 parts of sodium alginate, 3 to 6 parts of chitosan, 2 to 4 parts of calcium chloride, 1 to 3 parts of carboxymethyl cellulose and 1 to 2 parts of nano silicon dioxide. The snow melting and deicing speed of the environment-friendly snow melting and deicing composition in a severe cold environment can be increased.

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.

This invention relates to a method for preparing a nonlinear optical material and its application, specifically a magnesium aminodiacetate dihydrate compound. The molecular formula of the crystal is Mg[NH2(CH2COO)2]·2H2O. The Mg[NH2(CH2COO)2]·2H2O crystal does not have a center of symmetry, belongs to the tetragonal crystal system, has a space group of P-421c, and has cell parameters of α=β=γ=90°, Z=2. The nonlinear optical crystal of this invention has a large frequency doubling effect; at the same time, its ultraviolet absorption edge is 225nm, thus belonging to the tetragonal crystal system, with a space group of P-421c and cell parameters of α=β=γ=90°, Z=2. The nonlinear optical crystal can achieve the second harmonic of Nd:YAG (λ=1.064μm); and it can be predicted that the Mg[NH2(CH2COO)2]·2H2O crystal can be used in the third harmonic generator of Nd:YAG.

The application relates to a method for synthesizing 2,5-furan dicarboxylic acid from 5-hydroxymethylfurfural by using a ruthenium-loaded copper-cobalt metal oxide composite magnesium oxide catalyst. The method comprises the following steps: mixing and grinding a copper-cobalt hydroxide precursor prepared by a hydrothermal-calcination method with anhydrous magnesium acetate and then calcining to obtain a catalyst carrier; and using an impregnation-reduction method to load ruthenium nanoparticles on the carrier as an active component. The synergistic effect of the active component and the carrier enables 5-hydroxymethylfurfural to be catalytically converted into 2,5-furan dicarboxylic acid in a high-efficiency and selective manner. The catalyst preparation process is simple and easy to scale up. In the absence of alkali, the conversion rate of 5-hydroxymethylfurfural can reach 100%, and the yield of 2,5-furan dicarboxylic acid is 86.1%. The semi-preparative liquid chromatography is used for green separation and purification of the product, and 2,5-furan dicarboxylic acid with a purity of more than 99% is obtained. The method has potential application value for large-scale production of 2,5-furan dicarboxylic acid.

The application discloses a high-efficiency stable Lewis acid-containing heterogeneous catalyst and a preparation method and application thereof, and belongs to the technical field of cycloaddition reaction catalysts.The heterogeneous catalyst has strong nucleophilic groups and strong electrophilic groups.The Lewis acid-containing raw material is selected from one of zinc acetate, cobalt acetate, copper acetate, ferrous acetate, magnesium acetate, nickel acetate, calcium acetate, manganese acetate, lead acetate and tin acetate.The prepared Lewis acid-containing heterogeneous catalyst is applied to catalyzing the cycloaddition reaction of an epoxide and CO2, and the cycloaddition reaction of ethylene oxide (EO) / propylene oxide (PO) and CO2 is preferentially adopted.The problems of difficult separation of a homogeneous catalyst and insufficient activity of a heterogeneous catalyst are preferably solved.

A method of producing magnesium cement. The method may comprise mixing water at a temperature of between approximately 50° C. and 100° C. and a magnesium salt to form an intermediate mixture and then mixing the intermediate mixture with a magnesium oxygen-containing compound. The magnesium oxygen-containing compound may comprise one or more of magnesium oxide and magnesium hydroxide. The magnesium salt may comprise one or more of magnesium acetate, magnesium bromide, magnesium oxalate, magnesium thiosulfate, magnesium phosphate, magnesium nitrate, magnesium silicate, a magnesium chloride in any hydration state, anhydrous magnesium chloride, hexahydrate magnesium chloride, a magnesium sulfate in any hydration state, anhydrous magnesium sulfate, heptahydrate magnesium sulfate and magnesium carbonate.

The invention relates to the field of composite acetate, and discloses a slow-release composite acetate low-freezing-point filler and a preparation method thereof.The preparation method comprises the steps that any two or more of sodium acetate, calcium acetate, potassium acetate or magnesium acetate are selected according to a preset proportion and evenly mixed, and an acetate mixed material is obtained; any two or more than two carriers of lignin fiber, diatomite, bentonite, zeolite and attapulgite are selected according to target slow release performance requirements; deionized water is taken and placed in an oil bath stirring pot, the heating temperature is controlled to 60 DEG C, and the acetate mixture is added; slowly adding the composite carrier within 10 minutes after the acetate is completely dissolved; transferring the adsorbed slurry to a constant-temperature drying box, and drying at 120 DEG C for 68 hours; mechanically crushing the dried solid material, controlling the particle size at 0.06 mm, and performing ultrasonic screening to obtain an intermediate product with uniform particle size; the invention has the advantage of excellent slow release performance.

The present invention relates to a cell lysate wherein the lysis buffer comprises magnesium acetate, the phosphorylation inhibitor K3L, the agonist of dephosphorylation GADD34 and a caspase inhibitor for use in, or as, a cell-free system and a method for preparing a cell-free protein synthesis system. Further provided is a method for expressing a protein in the cell-free protein synthesis system, a method for screening for a candidate compound for an effect on a target molecule and a use of the cell-free protein synthesis system. The present invention also provides a kit for the above-mentioned cell-free systems.

The invention discloses a magnesium modified wheat straw biochar-based slow-release rhizobium fertilizer and a preparation method thereof. The preparation method comprises the following steps: constructing hierarchical porous biochar MgWBC with magnesium-based active sites by adopting magnesium acetate impregnation and high-temperature pyrolysis; granular urea is used as a core, chitosan is used for packaging to realize directional loading and surface phase inversion film sealing of an MgWBC layer and rhizobium, and a composite structure with pH response capability is constructed. According to the method disclosed by the invention, the stress resistance and the directional colonization efficiency of the rhizobium are remarkably improved by utilizing the characteristic that the nitrogenase is activated by magnesium and the refuge effect of pores of the biochar. In a soybean-corn intercropping system, soybean nodulation and nitrogen fixation are enhanced and corn nutrition is met while nutrient slow release is realized through a synergistic mechanism of promoting nitrogen by magnesium. Experiments show that the yield of an intercropping system and the total nitrogen and effective magnesium level of soil can be remarkably improved, and the stability of soil aggregates is improved. The method is of great significance in promoting intercropping weight loss and efficiency improvement and cultivated land conservation.

This invention relates to the field of snow melting and de-icing technology, specifically to an environmentally friendly calcium-magnesium acetate composite snow melting agent and its preparation method, comprising the following raw materials: dolomite, biodegradable copolymer, nano-silica, and calcium carbonate. In this invention, the biodegradable copolymer, with its hydrophilic and hydrophobic segments in its molecular chain, can effectively regulate the crystal growth morphology and uniformly disperse within the system during the crystallization process. Subsequently, it synergistically works with nano-silica to form a composite coating network on the surface of calcium-magnesium acetate crystals, with the organic polymer as the continuous phase and nano-silica as the reinforcing phase. Simultaneously, the added calcium carbonate portion plays a role in inducing crystallization and regulating crystal morphology, while its micron-sized particles are embedded in the composite coating network as reinforcing fillers, jointly improving the physical properties of the product, including enhancing compressive strength, preventing storage agglomeration, and enabling the slow release of snow melting components, thus extending the effective action time.

This invention discloses a method for preparing a copper-based catalyst, comprising the following steps: (1) placing the material into a processing tank and adding deionized water to the processing tank; (2) sealing the processing tank, introducing carbon dioxide and oxygen-containing gas into the processing tank, and heating and stirring the mixture in the processing tank; after the carbon dioxide in the processing tank is no longer consumed, cooling is started, and solid 1 is obtained after cooling to room temperature; (3) combining the solid 1 with a support to obtain solid 2; (4) drying and calcining the solid 2, then flaking, crushing, and reducing it to obtain a copper-based catalyst. The material in step (1) includes metallic copper, zinc, and magnesium acetate. Since this invention does not add nitrates and sodium salts, the production process does not generate NOx or leave sodium ions, thus effectively avoiding the problem of high preparation costs of copper-based catalysts due to the need for secondary treatment of NOx and sodium ions.

The application provides a preparation method of a lithium metal negative electrode carbon-based host material, and belongs to the technical field of lithium batteries, and comprises the following steps: adding polytetrafluoroethylene concentrated dispersion liquid into a mixed solution of polyvinyl alcohol solution and boric acid solution and uniformly mixing; then adding magnesium acetate tetrahydrate and deionized water and uniformly mixing; performing electrostatic spinning to obtain an original silk film, and performing pre-oxidation treatment and carbonization treatment on the original silk film to obtain the lithium metal negative electrode carbon-based host material of magnesium fluoride nanodot covalent bonding honeycomb-like carbon nanofiber. The precursor solution is converted into a nanofiber film through the electrostatic spinning technology, and the lithium metal negative electrode carbon-based host material is obtained by combining a subsequent heat treatment process. The host material contains honeycomb-like holes, effectively increases the specific surface area, reduces the local current density, inhibits the generation of lithium dendrites, simultaneously, the ultra-small magnesium fluoride nanodots are uniformly loaded on the surface of the carbon skeleton, reduces the lithium nucleation energy barrier, and promotes the uniform deposition of lithium.

The present application relates to the technical field of aluminum and aluminum alloy anodic oxidation film surface treatment, and discloses an aluminum alloy anodic oxidation film sealing agent with sealing and hydrophobic functions and application thereof, which is composed of the following components: magnesium acetate, ammonia organic acid, ammonia surfactant, corrosion inhibitor, pH buffer and water. The present application uses magnesium acetate as the main sealing material, and ammonia organic acid and ammonia surfactant are used in synergistic action to realize efficient sealing of the anodic oxidation film and simultaneously build a hydrophobic surface, and the obtained film layer has a water drop angle of > 110°. The sealing agent uses water as the solvent, does not contain volatile organic compounds (VOC), heavy metal ions and toxic and harmful substances such as formaldehyde, has long-term hydrophobicity and excellent corrosion resistance, is environmentally friendly and harmless, has low cost, and is simple to operate, and is suitable for protective treatment of aluminum alloy anodic oxidation film.

The application relates to a method for modifying and protecting bulletproof fiber fabric under a seawater environment based on magnesium hydroxide, and belongs to the technical field of fiber fabric modification. Alkaline and acidic impurities on the surface of the fiber fabric are removed, and the activity and interface performance of the surface are improved; then, an aqueous solution containing magnesium nitrate, ammonia and silane coupling agent KH560 is used as a magnesium hydroxide seed solution to form a magnesium hydroxide seed layer on the surface of the fiber fabric; and then, an aqueous solution pre-reacted by magnesium acetate, urotropine and silane coupling agent KH560 is used as a magnesium hydroxide growth solution to form a magnesium hydroxide growth layer on the magnesium hydroxide seed layer, so that the preparation of the bulletproof fiber fabric under the seawater environment based on magnesium hydroxide modification protection is completed. The two-layer magnesium hydroxide composite layer prepared by using the two solutions can effectively enhance the resistance of the fiber fabric to the seawater corrosion environment, so that the bulletproof performance of the fiber fabric is improved and can be maintained for a long time.

The invention discloses Cas9-based primers, a Cas9-based detection system, a Cas9-based detection method and a Cas9-based detection kit for colletotrichum gloeosporioides on fruits and vegetables, and the Cas9-based detection system comprises an RPA forward primer, an RPA reverse primer and an sgRNA sequence; the nucleotide sequence of the RPA forward primer is as shown in SEQ ID NO.1, the nucleotide sequence of the RPA reverse primer is as shown in SEQ ID NO.2, and the nucleotide sequence of the sgRNA sequence is as shown in SEQ ID NO.3; the detection system comprises an RPA (recombinase polymerase amplification) pre-amplification reaction mixed solution and a CRISPR-dCas9 detection mixed solution; the RPA pre-amplification reaction mixed solution contains an RPA forward primer and an RPA reverse primer; the CRISPR-dCas9 detection mixed solution contains an sgRNA (small guide ribonucleic acid) sequence and dCas9 biotinylated protein. The detection method comprises the following steps: placing a CRISPR-dCas9 detection mixed solution on a cover of a reaction tube; placing an RPA pre-amplification reaction mixed solution at the bottom of a reaction tube, and adding a DNA template solution and a magnesium acetate solution for incubation; inverting the reaction tube and continuing incubation; adding a chromatography buffer solution into the reaction tube, and inserting a lateral chromatography test strip for detection. The method can solve the problems of long time consumption and low accuracy of a traditional colletotrichum gloeosporioides morphological identification method.

The invention relates to a high-flux synthesis method of yttrium-magnesium-based multiphase powder and a preparation method of large-size multiphase ceramic. The high-flux synthesis method of the yttrium-magnesium-based multiphase powder comprises the following steps: (1) mixing a raw material containing a yttrium source and a magnesium source with a solvent, heating and continuously stirring to obtain a yttrium-magnesium precursor solution; the yttrium source is selected from at least one of yttrium chloride, yttrium nitrate and yttrium acetate; the magnesium source is selected from at least one of magnesium chloride, magnesium nitrate and magnesium acetate; the molar ratio of yttrium ions to magnesium ions in the yttrium-magnesium precursor solution is (1: 3)-(3: 4); and (2) synthesizing the yttrium-magnesium-based multiphase powder by adopting a flame spray pyrolysis method.

The invention relates to a stable determination kit for a multi-parameter electrolyte analyzer. The stable determination kit comprises a solution A and a solution B, the solution A is prepared from the following components: 80 to 160 mmol / L of sodium chloride, 2 to 10 mmol / L of potassium chloride, 1 to 10 mmol / L of lithium acetate, 0.1 to 5 mmol / L of magnesium acetate, 0.1 to 4 mmol / L of anhydrous calcium chloride, 10 to 100 mmol / L of anhydrous sodium acetate, 50 to 100 mmol / L of buffer solution, 0.1 to 10 g / L of preservative, 0.1 to 10 g / L of stabilizer and 0.1 to 10 g / L of surfactant. The solution B is prepared from the following components: 10 to 100 mmol / L of sodium chloride, 2 to 10 mmol / L of potassium chloride, 1 to 10 mmol / L of lithium acetate, 0.1 to 5 mmol / L of magnesium acetate, 0.1 to 4 mmol / L of anhydrous calcium chloride, 10 to 100 mmol / L of anhydrous sodium acetate, 50 to 150 mmol / L of buffer solution, 0.1 to 10 g / L of preservative, 0.1 to 10 g / L of stabilizer and 0.1 to 10 g / L of surfactant. The content of K < + >, Na < + >, Cl <->, Ca < 2 + >, Li < + >, Mg < 2 + > and pH in a sample can be tested at the same time, the accuracy, repeatability and recovery rate are not affected when the sample is stored for 24 months at the temperature of 2-37 DEG C, and the raw materials are easy to obtain.

Method for manufacturing elements for electrical working machines, which are formed with superimposed layers (1) of iron or an iron alloy with soft magnetic properties and in which an electrically insulating layer (2) is arranged between each of the layers (2) formed with iron or with the iron alloy, wherein the layers (1) of iron or the iron alloy each with a suspension formed with iron or with a powder of the iron alloy and an organic binder are formed by screen printing in a predetermined geometry with a predetermined first layer thickness and the electrically insulating layers (2) formed between the layers (1) of iron or the iron alloy formed by screen printing, which are formed with a powder and an organic binder, are formed by screen printing in the specified geometry with a specified second layer thickness, wherein the powder is a hydroxide or acetate selected from magnesium hydroxide, aluminum hydroxide, zirconium hydroxide, magnesium acetate, aluminum acetate and zirconium acetate or a carbonate selected from magnesium carbonate and zirconium carbonate and Following screen printing, the resulting layer stack undergoes a thermal treatment, during which In a first stage, debinding takes place in the temperature range between 100 °C and 800 °C, whereby the respective hydroxide, acetate and / or carbonate is decomposed in the temperature range between 100 °C and 300 °C, and a chemical reaction is carried out in which the respective hydroxide, acetate and / or carbonate is formed into the respective metal oxide with a fine particle size distribution of < 1 µm, and following the first stage, a second stage of thermal treatment is carried out, in which in a reducing atmosphere at a temperature in the range of 1200°C to 1350°C, sintering of the iron or the respective iron alloy is carried out to form layers (1) with corresponding soft magnetic properties and porous electrically insulating layers (2) are obtained.

The invention provides a stable aluminum titanate whisker, a method for preparing the stable aluminum titanate whisker based on a non-aqueous precipitation method and application, and belongs to the technical field of high-performance inorganic materials. The preparation method comprises the following steps: by taking aluminum isopropoxide and aluminum ethoxide as aluminum sources, butyl titanate and ethyl titanate as titanium sources, magnesium acetate and magnesium ethoxide as doping agents and sodium molybdate and sodium chloride as molten salts, adding the aluminum sources, the titanium sources, the magnesium acetate and the magnesium ethoxide into an organic solvent to obtain a raw material mixed solution; and transferring the raw material mixed solution into a titanium alloy reaction kettle, carrying out a non-aqueous precipitation reaction to obtain a precipitation reaction slurry, carrying out centrifugal filtration, filter pressing and reduced pressure distillation to remove the solvent, recovering, and carrying out heat treatment on the uniform mixture of the precipitate and the fused salt in a box-type electric furnace to obtain the stable aluminum titanate whisker. The stable aluminum titanate crystal whisker new material can lay a foundation for preparing high-strength and high-toughness aluminum titanate ceramic from a crystal whisker strengthening and toughening aluminum titanate ceramic material, and a new inorganic protective material system is provided for protective materials of metallurgy, aerospace and the like.

The invention relates to the technical field of aluminum and aluminum alloy anode oxide film surface treatment, and discloses an aluminum alloy anode oxide film hole sealing agent with sealing and hydrophobic functions and application thereof, and the aluminum alloy anode oxide film hole sealing agent is composed of magnesium acetate, ammonia organic acid, an ammonia surfactant, a corrosion inhibitor, a pH buffering agent and water. Magnesium acetate is used as a main hole sealing substance and cooperates with the synergistic effect of the ammonia organic acid and the ammonia surfactant, the hydrophobic surface is synchronously constructed while efficient sealing of the anodic oxide film is achieved, and the water drop angle of the obtained film layer is larger than 110 degrees; the hole sealing agent takes water as a solvent, does not contain toxic and harmful substances such as volatile organic compounds (VOC), heavy metal ions and formaldehyde, has long-acting hydrophobicity and excellent corrosion resistance, and is environment-friendly, harmless, low in cost, simple and convenient in process operation and suitable for protection treatment of the aluminum alloy anode oxide film.

This invention discloses a trivalent chromium-doped yttrium aluminum garnet powder and its preparation method. The chemical formula of the powder is (Y 1‑ y Ca y )3(Al 1‑x‑z Cr x Mg z )5O 12 Furthermore, 0.001≤x≤0.02, 0.0001≤y≤0.005, and 0.0001≤z≤0.003; This invention uses yttrium nitrate and aluminum nitrate as main materials, and chromium nitrate, magnesium acetate, and calcium acetate as dopants. The precursor is prepared by adding it dropwise to ammonium bicarbonate bottom solution via reverse co-precipitation. The target powder is obtained by drying and calcination. This invention constructs a nitrate-acetate composite system and utilizes the in-situ thermal decomposition gas generation effect of acetate to suppress grain necking, reconstructing hard agglomerates into soft agglomerates. At the same time, it achieves atomic-level in-situ doping of Mg and Ca in the YAG lattice. The resulting powder has both high dispersibility and high sintering activity, and is suitable for preparing Cr:YAG transparent ceramics with high linear transmittance.