856 results about "Citrate sodium" patented technology

The invention belongs to the technical field of SERS (Surface Enhanced Raman Scattering) detection, and particularly relates to an Ag-MoO2 composite SERS substrate as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, preparing Ag nanoparticles which are uniformly distributed and have the same size by a sodium citrate reduction method; secondly, a MoO2 material is prepared through a hydrothermal method; and finally, the novel SERS substrate Ag-MoO2 is prepared through a physical stirring method. According to the invention, the novel SERS substrate made of Ag nanoparticles and MoO2 materials is constructed, which is different from the conventional SERS substrate made of independent Ag nanoparticles, and can detect stronger intrinsic Raman signals of probe molecules. As the SERS substrate needs to be compounded with a MoO2 material during preparation, a charge transfer phenomenon can occur at an interface where the SERS substrate is in contact with probe molecules, so that intrinsic Raman signals of the probe molecules can be enhanced, and the SERS substrate can be better used for detecting and analyzing chemical substances.

The invention relates to the technical field of building materials, in particular to impermeable waterproof dry-mixed mortar and a preparation method thereof. The impervious waterproof dry-mixed mortar is prepared from the following raw materials in parts by weight: 1400 to 1550 parts of machine-made sand, 380 to 420 parts of Portland cement, 60 to 80 parts of fly ash, 30 to 50 parts of expanded perlite, 10 to 20 parts of latex powder, 7 to 10 parts of sepiolite powder, 5 to 10 parts of nano wollastonite powder, 2 to 4 parts of hydroxyethyl methyl cellulose, 2 to 5 parts of sodium citrate, 10 to 20 parts of fiber reinforcing agent, 3 to 5 parts of impervious agent, 6 to 10 parts of waterproof agent, 2 to 4 parts of expanding agent and 3 to 6 parts of water reducing agent. The dry-mixed mortar prepared by the invention not only has excellent mechanical properties, but also has good impermeability and waterproof performance, and the service life of the dry-mixed mortar is prolonged to a certain extent while the quality of the dry-mixed mortar is effectively guaranteed.

The invention includes a mutant Taq polymerase, which can effectively amplify a target sequence under conditions of salt concentration(s) similar to body fluids, including blood, serum or plasma preserved with sodium citrate. The mutant Taq polymerase, or a biologically active fragment thereof, has one or more substitutions differing from the wild type as shown in Table I.

The invention discloses an efficient combined regulator for easily-argillized copper oxide cobalt ore and a beneficiation method. The efficient combined regulator comprises the following components in parts by weight: 250-350 parts of sodium citrate and 1100-1200 parts of sodium hydrosulfide. Sodium citrate has high dispersing capacity, and the efficiency of selective adsorption between the argillization copper-cobalt ore and the medicament can be improved; meanwhile, the complexing ability of sodium citrate on ions, such as Fe, Ca and Mg, influencing agent adsorption on the surface of the ore is high, in addition, products obtained after complexing of the Fe, Ca and Mg ions can be dissolved in water, and action sites are provided for selective adsorption of a vulcanizing agent (NaHS) and a collecting agent amyl xanthate (PAX). According to the combined regulator and the beneficiation method provided by the invention, the problem of poor reagent selectivity in the flotation process of the argillization copper-cobalt ore can be obviously improved, the vulcanization effect of a vulcanizing agent is enhanced, and selective adsorption of a collecting agent is promoted, so that the recovery rate of copper and cobalt metals in the copper-cobalt oxide ore under the condition of serious ore argillization is improved.

The invention relates to the technical field of cement-based anticorrosive materials, and particularly discloses a modified magnesium phosphate cement anticorrosive material as well as a use method and application thereof. The anticorrosive material comprises the following components in parts by weight: 100 parts of modified magnesium phosphate cement, 3-15 parts of a retarder, 1-10 parts of an epoxy resin glue solution, 0.5-5 parts of metakaolin and 15-20 parts of water. The modified magnesium phosphate cement comprises dead burned magnesium oxide and modified phosphate in a mass ratio of (1-4): 1. The modified phosphate is prepared from the following raw materials: nano aluminum oxide, sodium citrate and phosphate in a mass ratio of (0.5-1.5): (0.5-1.5): (20-25). The epoxy resin glue solution comprises uncured epoxy resin glue and a curing agent. The anti-corrosion material provided by the invention has the technical advantages of strong adhesive property and excellent anti-corrosion property, and can better provide protection for a steel structure serving in a marine environment.

The invention provides a preparation method of composite modified hydroxypropyl starch ether, and relates to the technical field of starch ether preparation. Corn starch and cassava starch are used as raw materials, the modified hydroxypropyl starch ether is prepared through premixing, alkalization and high-low temperature layering etherification, sodium citrate is added in the etherification process to serve as a stabilizer, the produced product has the advantages of being high in hydroxypropyl content, viscosity, solution transparency and whiteness, low in ash content and the like, the production cost is reduced, and the product is suitable for industrial production. The requirements of the market on high-quality, high-stability and low-cost starch ether are met.

The invention provides a carbonate-doped high-activity full-decomposition seawater electro-catalytic material as well as a preparation method and application thereof. The preparation method of the material comprises the following steps: placing a pretreated foamed nickel (NF) current collector in a cobalt source aqueous solution, and carrying out a hydrothermal reaction; after the reaction is finished, cooling, washing and drying to obtain a Co3O4 / NF precursor composite material; placing the obtained Co3O4 / NF precursor composite material in a mixed solution containing a cobalt source, a molybdenum source, urea and sodium citrate, and carrying out a hydrothermal reaction; and after the reaction is finished, cooling, washing and drying to obtain the product. According to the preparation method, the three-dimensional metal foam nickel is taken as a current collector, the stable full-decomposition seawater electrocatalyst with high activity and chlorine corrosion resistance is prepared through two-step mild hydrothermal reaction, and the prepared composite catalyst can drive full-decomposition seawater to stably operate for a long time under a relatively low potential.

The invention relates to the technical field of harmful substance detection, in particular to a preparation method and application of a magnetic organic covalent framework material for extracting pyrethroid pesticide in peanuts, and the preparation method comprises the following steps: step 1, dropwise adding an iron standard solution into a NaOH solution, stirring to react, cooling to room temperature after the reaction is finished, then dropwise adding a sodium citrate solution, mechanically stirring, and filtering to obtain a filtrate; magnetically separating a product, washing and drying to obtain Fe3O4 nanoparticles; step 2, mixing the Fe3O4 nanoparticles, DVA, TA, TAPT and acetonitrile, performing ultrasonic treatment, then adding acetic acid, oscillating the mixture, and then stirring and refluxing; the product is washed and dried, and COF coated Fe3O4 is obtained; step 3, uniformly dispersing COF coated Fe3O4 in an acrylamide solution, and then irradiating by a xenon lamp; and washing and drying the product to obtain the magnetic organic covalent framework material PAM-COF coated Fe3O4. The PAM-COF coated Fe3O4 material prepared by the preparation method disclosed by the invention can realize efficient extraction of various pyrethroid pesticides at the same time, and has relatively strong matrix anti-interference capability and excellent enrichment and purification performance.

The invention provides a secondary battery and an electronic device, the secondary battery comprises a positive pole piece and a negative pole piece, the positive pole piece comprises a positive pole material layer, the positive pole material layer comprises a positive pole active material, and the positive pole active material comprises a manganese-containing material; the manganese-containing material comprises at least one of lithium manganate, lithium iron manganese phosphate, a lithium-rich manganese-based material or nickel cobalt lithium manganate. The negative pole piece comprises a first additive, the first additive comprises at least one of carboxylate, sulfonate or a metal organic framework compound, carboxylate comprises at least one of lithium oxalate, sodium citrate, sodium maleate or sodium tartrate, sulfonate comprises at least one of sodium benzenesulfonate, sodium dodecyl benzene sulfonate or sodium methanesulfonate, and metal organic framework compound comprises at least one of lithium oxalate, sodium citrate, sodium maleate or sodium tartrate. The metal organic framework compound is prepared from at least one of Zn (C4H7N2) 2, C48H28O32Zr6 or C14H16N2O8Mg2. The invention further discloses a preparation method of the metal organic framework compound. The secondary battery meets the characteristics, and the cycle performance of the secondary battery can be improved.

The invention discloses a high-salt-resistance composite cleanup additive and a preparation method thereof, and relates to the technical field of oilfield chemical additives. The invention discloses a high-salt-resistance composite discharge aiding agent. The cleaning agent is prepared from the following raw materials in parts by weight: 10 to 20 parts of modified sodium dodecyl benzene sulfonate, 5 to 10 parts of cocamidopropyl betaine, 8 to 15 parts of polyoxyethylene ether, 2 to 5 parts of nano silicon dioxide, 3 to 8 parts of sodium hexametaphosphate, 1 to 3 parts of low-molecular-weight polyacrylamide, 4 to 10 parts of modified polyacrylic acid-acrylamide copolymer, 15 to 30 parts of ethanol and 5 to 12 parts of ethylene glycol butyl ether. 2-6 parts of an imidazoline derivative, 3-7 parts of amino trimethylene phosphonic acid, 4-9 parts of sodium silicate and 2-5 parts of citric acid-sodium citrate. Aiming at development requirements of high-salt oil reservoirs, sodium dodecyl benzene sulfonate and the polyacrylic acid-acrylamide copolymer are modified, and raw materials are scientifically compounded, so that the cleanup additive shows high stability in a high-salt environment, can reduce interfacial tension and effectively regulate and control rock surface wettability, has foam stability and biodegradability, and can be widely applied to high-salt oil reservoirs. The method is suitable for high-salt complex oil reservoir operation scenes.

The invention discloses a preparation method and application of octahedral cuprous oxide containing defects, and belongs to the technical field of material preparation. In order to solve the problems that in existing cuprous oxide preparation, a defect structure is difficult to accurately regulate and control, and the crystal form uniformity is insufficient, the method comprises the steps that a copper source solution, a glucose solution, a sodium citrate solution and an ammonium fluoride solution with specific concentrations are mixed according to the volume ratio, the pH is adjusted to 10.5-11, then a hydrothermal reaction is conducted, and a target product is obtained through centrifugation, filtration, washing and drying. The method comprises the following specific steps: mixing solutions, reacting in a high-pressure reaction kettle at 140-165 DEG C for 4-6 hours, and realizing octahedral crystal form construction and defect regulation and control by controlling the raw material ratio and reaction conditions. The preparation method is simple in process and high in controllability, and the prepared octahedral cuprous oxide containing defects can serve as a catalyst to be applied to the fields of catalytic decomposition of ammonium perchlorate and the like and has good industrial application prospects.

The invention discloses a hybrid Ag / MXene / Fe-Co MOF surface enhanced Raman scattering sensor and an application of the hybrid Ag / MXene / Fe-Co MOF surface enhanced Raman scattering sensor in rapid detection of bacteria. According to the sensor, silver nanoparticles are prepared through a sodium citrate reduction method, a two-dimensional material MXene and a bimetal organic framework are combined, and a surface enhanced Raman scattering spectrum detection platform with high sensitivity, stability and anti-interference performance is constructed. The conductive network of MXene and the local surface plasmon resonance effect of silver nanoparticles synergistically enhance an electromagnetic field, and the porous structure of Fe-Co MOF enriches target molecules and forms dense hot spots, so that the Raman signal intensity is remarkably improved. Experiments show that the detection limit of the sensor to 4-mercaptobenzoic acid is as low as 10 <-12 > M, and the signal stability can last for 7 days; the detection limit on common pathogenic bacteria such as escherichia coli and staphylococcus aureus reaches 10 CFU / mL, and the linear correlation coefficient is superior to 0.96. The sensor has hydrophobicity and biocompatibility, can efficiently capture bacteria through capillary force, is suitable for trace detection of complex samples, and provides a new strategy for rapid diagnosis of clinical drug-resistant bacteria.

The invention provides a haematococcus pluvialis culture medium and a culture method thereof. The culture medium comprises a nutrition proliferation culture medium, a stress induction culture medium and an accumulation strengthening culture medium which are used for segmented culture, the nutrition proliferation culture medium comprises sodium nitrate, monopotassium phosphate, potassium chloride, ferric ammonium citrate, sodium citrate and a trace element mixed solution; adding an osmotic stress agent, an oxidation inducer and plant hormones into a stress induction culture medium; and accumulating and strengthening the culture medium to remove sodium nitrate, and adding and supplementing a carbon source, a polymer penetrant and a zwitterionic stabilizer. The culture method comprises the following steps: a nutrition proliferation stage, a stress induction stage and an accumulation strengthening stage. According to the method, through a three-section culture medium and a fine regulation culture process, and through the synergistic effect of a composite stress factor and a dynamic environment signal, on the premise of ensuring relatively high activity of algae cells, bidirectional synergistic efficient improvement of biomass growth and astaxanthin accumulation is realized.

The invention relates to the technical field of medical dressings, in particular to a liquid adhesive bandage and a preparation method thereof.The preparation method comprises the following steps that according to the formula amount, sodium chloride and sodium citrate are added into water, and a mixture A is obtained; adding copper gluconate into the mixture A to form a mixture B; mixing Tween 20 with glycerin, adding L-menthol, and stirring to form a mixture C; adding the mixture C into the mixture B to form a mixture D; the preparation method comprises the following steps: adding acetic acid into water, uniformly mixing, adding chitosan, and dissolving to obtain a chitosan-acetic acid solution; adding a chitosan-acetic acid solution into the mixture D, and dissolving to form a mixture E; adjusting the pH value of the mixture E to 4.5-6.5, filtering, filling and sterilizing to obtain the liquid adhesive bandage. The prepared liquid adhesive bandage can quickly form a layer of protective film on the surface of a wound, effectively inhibits growth of bacteria and promotes wound healing, and meanwhile, the liquid adhesive bandage has good flexibility and comfort and small irritation.

The invention provides a new energy automobile battery flexible disassembling adhesive and a preparation method thereof, and belongs to the technical field of new energy automobile batteries, the flexible disassembling adhesive comprises the following components by weight: 45-50 parts of deionized water; 8 to 10 parts of gamma-butyrolactone; 5 to 8 parts of propylene glycol methyl ether acetate; 2 to 3 parts of microencapsulated lipase; 2 to 3 parts of nano cellulose immobilized protease; 6 to 8 parts of urea peroxide; 0.5 to 1 part of nano manganese dioxide; 0.7 to 1.1 parts of a sodium citrate / sodium lactate buffer solution; 1.5 to 2.5 parts of polyvinylpyrrolidone K30; 0.8 to 1.2 parts of hydroxypropyl methyl cellulose; 0.05 to 0.1 part of a graphene oxide nanosheet; 0.5 to 0.8 part of a benzotriazole derivative; 0.1 to 0.3 part of sodium molybdate; 6 to 8 parts of sorbitol; and 5-7 parts of ascorbic acid. The flexible disassembly adhesive solves the problems of low efficiency, serious environmental pollution, high safety risk and low material recovery rate in traditional battery disassembly.

The invention discloses a preparation method of a chemical composite plating solution based on nano niobium carbide. The preparation method comprises the following steps: step 1, pretreating niobium carbide (NbC) powder; step 2, preparing a chemical plating solution, wherein every 1L of the chemical plating solution contains 30g of nickel chloride, 20g of sodium hypophosphite, 10g of sodium citrate, 5g of glycine, 10g of sodium acetate, 0.3 g of sodium dodecyl benzene sulfonate and 80mg of zinc molybdate; fixing the volume to 1L by using distilled water; 3, measuring the niobium carbide suspension liquid, mixing the niobium carbide suspension liquid with the chemical plating solution, and fixing the volume, so that the content of niobium carbide in the chemical composite plating solution is 0.01-0.3 g / L; adjusting the pH value of the solution to 5.8; according to the method, niobium carbide nanoparticles are added into the chemical composite plating solution, so that the surface of a plated part and metal gold are combined with the particles, and the hardness and wear resistance of a base material are effectively improved; the effect on a 60-80-micron nickel-phosphorus coating in the industry is achieved through the ultrathin chemical composite coating (8-10 microns), so that the corrosion resistance and the wear resistance of the product are enhanced.

The invention relates to the technical field of high-wear-resistance alloys, and particularly discloses a preparation method of a high-wear-resistance alloy steel lining plate. The preparation method comprises the following steps that S1, an alloy steel lining plate is placed in a plating solution to be electroplated, and an alloy steel lining plate A with a plating layer A on the surface is obtained; the plating solution comprises the following raw materials: 45-60 g / L of sodium citrate dehydrate, 30-35 g / L of boric acid, 5-8 g / L of ammonium chloride, 80-100 g / L of nickel aminosulfonate, 180-200 g / L of iron aminosulfonate, 0.5-0.8 g / L of lauryl sodium sulfate, 2-5 g / L of modified boron nitride and the balance of deionized water. S2, an alloy steel lining plate A is taken, the surface of the alloy steel lining plate A is plated with a transition metal boride layer through arc ion plating, the transition metal boride layer serves as a plating layer B, and an alloy steel lining plate B is obtained; and S3, the alloy steel lining plate B is taken, boronizing is conducted after annealing, and the high-wear-resistance alloy steel lining plate is obtained.

The invention provides a method for grafting Tibetan white bark pine on Chinese pine, belongs to the technical field of needle-leaved tree species grafting, and solves the technical problem that the survival rate is lower than 40% due to slow joint healing, high pathogen infection rate and environmental fluctuation. According to the technical scheme, the method is characterized by comprising the following steps: cutting 1.8-2.2 cm of a vertical notch reaching xylem at the part, which is 2.5-3.5 cm exposed out of the surface of a culture medium, of a rootstock rhizome part; cutting the scion base into a symmetrical double-sided wedge shape, and immersing the scion base into a sodium citrate buffer solution containing polyvinylpyrrolidone, methyl salicylate and calcium chloride; the two sides of the vertical notch are coated with adsorption glue; inserting a scion alignment cambium and fixing by using a grafting belt; an ethanol water solution containing salicylic acid, trehalose and polysorbate 80 is applied to the interface every 2-3 days; maintaining the day temperature to be 23-25 DEG C, the night temperature to be 16-18 DEG C and the humidity to be 90-95%; when the young sprouts grow to 2-3 cm, the rootstocks are girdled, and trunks are cut off after 7-10 days. The method is used for large-scale breeding of the Tibetan pinus bungeana grafted seedlings.

The invention provides a chemical plating solution, a preparation method of the chemical plating solution, a Ni-P-Gr chemical plating layer and a preparation method and application of the Ni-P-Gr chemical plating layer, and relates to the technical field of chemical plating. The preparation method comprises the following steps: adjusting the pH value of nickel sulfate, sodium citrate, sodium acetate, sodium hypophosphite and graphene oxide to 4-4.5, mixing with sodium dodecyl benzene sulfonate, homogenizing, and ultrasonically dispersing to obtain the chemical plating solution. Homogenization treatment and ultrasonic dispersion are used in the process of preparing the chemical plating solution, the addition amount of the graphene oxide is controlled to be 0.1-0.4 g / L, and the ultrasonic dispersion conditions are 100-180 W and 35-55 min, so that the graphene oxide in the prepared chemical plating solution is good in dispersion uniformity, and the chemical plating solution is uniform in dispersion. The graphene oxide in a Ni-P-Gr chemical plating layer formed by adopting the chemical plating solution prepared by the invention is good in dispersity, and the Ni-P-Gr chemical plating layer is high in hardness, good in wear resistance and strong in binding force with a matrix.

The invention relates to the technical field of stainless steel bands, and particularly discloses a wear-resistant duplex stainless steel band and a processing technology thereof. The method specifically comprises the following steps that S1, the surface of a duplex stainless steel band is electroplated with an iron-nickel-copper layer, and a stainless steel band A is obtained; the plating solution comprises the following components: 40-50 g / L of nickel sulfate hexahydrate, 20-30 g / L of ferric sulfate, 30-40 g / L of copper sulfate pentahydrate, 35-45 g / L of sodium citrate dehydrate, 25-30 g / L of sodium acetate and 20-25 g / L of sodium hypophosphite; s2, uniformly mixing organic silicon resin, hydrogen-containing silicone oil, ethanol, nano silicon carbide and a corrosion-resistant antibacterial agent to obtain a corrosion-resistant antibacterial coating; s3, the surface of the stainless steel band A is coated with the corrosion-resistant antibacterial coating, drying is conducted at the room temperature, and a stainless steel band B with a corrosion-resistant antibacterial coating on the surface is obtained; and coating gallium-containing zinc oxide sol on the surface of the stainless steel band B, and carrying out heat treatment to obtain the wear-resistant duplex stainless steel band with a gallium-containing zinc oxide layer on the surface.

The invention provides a lactic acid electrochemical sensor LDHamp; the invention relates to construction of BiNPs (at) MWCNTs / GCE and a serum lactic acid detection method, and belongs to the technical field of biosensors, the method comprises the following steps: taking sodium citrate, Bi (NO3) 35H2O and NaBH4 as raw materials, synthesizing BiNPs through a multi-step reaction, compounding the BiNPs with MWCNTs, carrying out carboxyl activation and loading LDH, and finally modifying on a glassy carbon electrode to obtain the sensor. During detection, the sensor is placed in a PBS system containing 5mM of NAD, a serum sample is added, and the concentration of lactic acid is measured by electrochemical scanning according to current response change. According to the method, the detection linear range is 0-200 [mu] M, the detection limit is as low as 0.03 [mu] M, the detection difference of different batches of sensors is small, the method shows the advantages of high sensitivity and good stability, meanwhile, efficient and accurate detection of lactic acid in serum is achieved, and powerful support is provided for clinical diagnosis and disease research.

The invention discloses a preparation method of heat-insulating PVB (Polyvinyl Butyral) resin powder and a heat-insulating PVB film, and belongs to the technical field of PVB resin powder preparation. Comprising the following steps: S1, adding heat-insulating powder, sodium citrate and an auxiliary agent into a hydrochloric acid solution, fully stirring to obtain a heat-insulating powder suspension, ball-milling to obtain slurry, adjusting the pH value to be less than 1, and centrifuging to obtain a nano heat-insulating dispersion liquid; s2, fully reacting a PVA solution / n-butyraldehyde mixed solution with the nano heat-insulating dispersion liquid, washing, centrifuging and drying to obtain heat-insulating PVB resin powder; wherein the heat insulation powder is selected from rare earth element compounds. The PVB resin powder is used for preparing the heat-insulating PVB film. The infrared barrier rate of the PVB film in a low wave band and a high wave band can reach 98% or above, the full-wave-band infrared light barrier performance is remarkably improved, the light transmittance meets the standard of the heat-insulating PVB film, the haze is greatly reduced compared with a common heat-insulating film without a sodium citrate auxiliary, and the heat-insulating PVB film has excellent infrared shielding performance and optical performance.

The invention discloses gelatin / PVA (Polyvinyl Alcohol)-based double-network structure hydrogel, a flexible hydrogel electrode, a hydrogel-TENG sensor and a preparation method. The gelatin / polyvinyl alcohol-based double-network structure hydrogel with high flexibility, transparency, adhesion, self-healing capability, degradability and biocompatibility is prepared by introducing functional components including glycerol, sodium chloride, citric acid and sodium citrate into gelatin and polyvinyl alcohol. According to the application, poly (3, 4-ethylenedioxythiophene)-polystyrene sulfonate, graphene and cobalt nano-porous carbon are respectively added into gelatin / polyvinyl alcohol-based hydrogel with a double-network structure, so that a flexible hydrogel electrode and a hydrogel-triboelectric sensor charge sensitive layer are respectively obtained; and the hydrogel-based flexible non-contact triboelectric sensor with biological friendliness is finally prepared by combining the hydrogel-based flexible non-contact triboelectric sensor with biological friendliness. The hydrogel-triboelectric sensor is expected to play a greater role in the fields of intelligent medical treatment, flexible electronic equipment, human-computer interaction and the like in the future.

The invention discloses an induction culture medium for preparing human umbilical cord mesenchymal stem cell exosomes and application of the induction culture medium, and relates to the technical field of exosome culture. The additive is prepared from the following components: 0.8 to 1.5 percent of ITS, 0.03 to 0.05 percent of a luteolin extract, 0.04 to 0.06 percent of a herba taraxaci extract, 0.02 to 0.04 percent of a radix ginseng extract, 0.03 to 0.05 percent of resveratrol, 0.01 to 0.03 percent of vitamin C, 0.03 to 0.05 percent of a pimpinella thellungiana extract, 0.01 to 0.03 percent of a rhizoma dioscoreae extract and 0.01 to 0.02 percent of sodium citrate; the induction culture medium provided by the invention not only can avoid introduction of exogenous substances and reduce the pollution risk, but also can promote proliferation of stem cells and effectively induce synthesis and exosome secretion of a large number of human umbilical cord mesenchymal stem cells.

The invention relates to the field of inorganic material preparation, and particularly discloses pseudo-boehmite and a preparation method thereof. A preparation method of pseudo-boehmite comprises the following steps: (1) mixing an aluminum salt solution and an aluminate solution, adding a crystal form regulating agent, and stirring for reaction to obtain a sol system; the crystal form regulating agent is ZnS quantum dots modified by thiohydracrylic acid; (2) adding a pore diameter guiding agent into the sol system, and aging for 6-8 hours; the pore diameter guiding agent is a compound of a polyethylene glycol-polypropylene glycol-polyethylene glycol triblock copolymer and sodium citrate; and (3) carrying out solid-liquid separation on the aged sol system, and washing and drying the obtained solid to obtain the pseudo-boehmite. The proportion of 5-10nm pores of the pseudo-boehmite prepared by the preparation method disclosed by the invention reaches 90% or above, so that the pore distribution requirement of a fine catalytic reaction on the pseudo-boehmite can be met, and the efficient catalytic reaction is favorably realized.

The invention belongs to the technical field of nano composite materials, and relates to a preparation method and application of a difunctional nano enzyme Eu (at) Ce-MOF. According to the invention, ceric ammonium nitrate is used as an inorganic metal source, terephthalic acid is used as an organic ligand, and Ce-MOF is synthesized in one step by using a hydrothermal method; and then introducing europium nitrate hexahydrate and sodium citrate to prepare the Eu (at) Ce-MOF composite material through one-step in-situ functionalization. Ce-MOF is functionalized by using europium nitrate hexahydrate, and second metal activity is introduced, so that the bi-metal synergistic effect is realized to enhance the peroxidase-like activity of the composite material; meanwhile, the introduced Eu < 3 + > is used as a recognition element and has specific recognition capability on Pi, specific recognition sites of the Eu-coated Ce-MOF composite material are increased, and the difunctional nano-enzyme with strong enzyme-like activity and specific recognition capability is prepared.

The invention discloses a bone cement composition and application thereof, and relates to the technical field of bone cement. The bone cement composition comprises a solid phase component and a liquid phase component, wherein the solid phase component comprises 60-75 parts of composite calcium phosphate, 10-20 parts of strontium glass powder, 8-12 parts of a reinforcing agent and 3-7 parts of a solidification reaction regulator; the liquid phase component comprises 20-30 parts of a phosphate buffer solution, 3-8 parts of a sodium citrate solution, 5-15 parts of an anti-inflammatory agent and 1-5 parts of a hyaluronic acid solution. The preparation method comprises the following steps: reacting 1, 10-phenanthrene-2, 9-dicarboxylic acid with 2-aminomethyl furan to obtain an intermediate 1, and reacting the intermediate 1 with poly (ethylene glycol) maleimide to prepare the reinforcing agent. The prepared bone cement composition has good mechanical properties, self-repairing performance and anti-inflammatory performance, and has a good application prospect in the field of bone repairing.

The invention belongs to the technical field of polishing, and particularly discloses a titanium heating disc surface nanometer polishing technology. The titanium heating disc surface nanometer polishing technology comprises the following steps that a workpiece is placed in a polishing solution, the temperature of the polishing solution ranges from 50 DEG C to 55 DEG C, electrochemical polishing is conducted at constant voltage, the voltage is controlled to range from 20 V to 30 V, the electrifying time ranges from 5 min to 10 min, and after electrochemical polishing is finished, the workpiece is taken out, washed with water and dried with nitrogen; the polishing solution comprises polishing salt and deionized water, wherein the polishing salt comprises the following components: ammonium sulfate, sodium citrate, glucose and citric acid. All the components are matched, metal ion impurities on the surface of a workpiece are removed, and a smoother and more uniform polished surface is obtained.

The present application relates to a sodium-ion battery precursor, a positive electrode material, a preparation method, and a use. A complexing agent solution used for preparing the sodium-ion battery precursor comprises a first complexing agent and a second complexing agent, wherein the first complexing agent comprises any one of or a combination of at least two of oxalic acid, sodium oxalate, or potassium oxalate, and the second complexing agent comprises any one of or a combination of at least two of citric acid, sodium citrate, or potassium citrate. In the present application, by providing the specific complexing agents, the prepared sodium-ion battery precursor has a relatively high specific surface area, thereby facilitating the intercalation of sodium ions when sintering and preparing a positive electrode material, so that the electrochemical performance of the sodium-ion battery positive electrode material can be significantly improved.

The invention discloses a PSA electrotinning insoluble anode system and a production method of an electrotinning plate, and relates to the technical field of electrotinning. The PSA tin electroplating insoluble anode system comprises an electroplating additive which is composed of benzotriazole, N-oleoyl sarcosine, S-carboxyethyl thiosuccinic acid and sodium citrate. The problems of serious black ash and poor coating performance of an electroplated tin plate product are solved, the tin plating stability of a plating solution in an electroplating bath is improved, the black ash on the surface of the electroplated tin plate product can be effectively reduced, the requirements of low black ash and high adhesive force on the surface of an electroplated tin plate of a PSA (Pressure Swing Adsorption) electroplated tin insoluble anode system are met, and the service life of the electroplated tin plate is prolonged. The electroplated tin plate produced through the PSA electroplated tin insoluble anode system is bright and clean in plating layer surface, and after the tin layer surface with the thickness of 8.4 g / m < 2 > and below is wiped through test paper, the reduction percentage of the test paper whiteness caused by black ash is smaller than or equal to 10%.