58results about How to "No obvious reunion" patented technology

The invention relates to an organically modified silica sol and a preparation method thereof. The preparation method comprises the steps: under stirring, adding organic silicon into an organic solvent to obtain a mixed solution A, wherein the molar ratio of organic silicon to the organic solvent is 1:7-12; under stirring, adding a silane coupling agent, POSS or a hyperbranched polymer, deionized water and a catalyst into the organic solvent, to obtain a mixed solution B, wherein the molar ratio of the modification agent (the hyperbranched polymer, the silane coupling agent or POSS), deionized water, the organic solvent and the catalyst is 1-10:45-55:150-170:0.01-1; under stirring, slowly dropwise adding the mixed solution A into the mixed solution B, transferring the mixed solution into a beaker, sealing a mouth with a parafilm, pricking a plurality of small holes on the parafilm, storing at the room temperature for 1-15 days, and thus obtaining the modified organic silicon sol. The organically modified silica sol and the preparation method thereof have the advantages of simple production process and lower manufacturing cost, the used solvent is the organic solvent, and the field of silica sol application is expanded.

A LiFePO4 / C preparation method comprises the following steps: (1) hydrothermal method is used to synthesize LiFePO4, the molar ratio of lithium to iron and phosphorus is 0.9-1.2:1:1, the molar ratio of precipitant to lithium is 0.5-2.5:1, the molar ratio of antioxidant to iron is 1:15-50; after crystal inducer is added in the mixed solution containing lithium, iron and phosphorus, the solution is transferred to an autoclave, then the autoclave is sealed and a reaction is performed in the autoclave at 160 -210 DEG C for 2-3h while stirring; (2) carbon is doped to perform calcinations, organic carbon source is doped in LiFePO4 prepared in the step 1, then a ball mill is used for mixing LiFePO4 and organic carbon source evenly, then the obtained mixture is added in a calcining furnace to heating at 500-850 DEG C under the protection of inert gas while keeping the temperature for 3-40h, the product is cooled along with the furnace to room temperature after heat insulation and the LiFePO4 / C is obtained.

The invention relates to a composite material of vacuum churning composite granule enhanced aluminum matrix and a preparation technique, which comprises: Si 0-15Wt%, Mg 0-1.5Wt%, Cu 0-2.0Wt%, Mn 0-1.0Wt%, Cr 0-0.4Wt%, Ti 0-0.2Wt%, SiC 0.1-20% (volume proportion). Firstly base alloy is smelted, slag is removed, and refined, churned slowly in vacuum to complete degassing procedure for base melt, the pre-treated enhanced granule is continuously added into the aluminum base melt, mechanical churning to roll the granule into the melt, after the granule is completely rolled in the melt, strong churning and slow churning in reverse direction are conducted so as to disperse the granule evenly in the base; the temperature raises, modifier and refiner are added; the vacuum is dismounted, and placed in static, the floating slag is removed above the melt, and cast. The composition between the granule and the base is realized via vacuum mechanical churning, the joining interface is good, the enhanced granule is evenly dispersed in the base, the prepared composite material has low porosity rate, which is easy to realize industrial mass production.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of lithium ion battery positive electrode slurry. The method comprises the following steps: S1, adding a conductive agent into a dispersing agent, and performing stirring and dispersing to obtain a conductive agent dispersion liquid with the solid content of 0.5-3%; S2, dissolving an adhesive in a solvent, and acquiring an adhesive solution with the solid content being 5-9%; S3, adding the adhesive solution into the conductive agent dispersion liquid, performing pre-stirring,and then fully stirring to obtain mixed slurry; S4, adding a positive electrode active material into the mixed slurry, performing pre-stirring, and then fully stirring to obtain positive electrode slurry with the solid content of 58-65%; wherein the step S1 and the step S2 are simultaneously carried out, the step S1 is firstly carried out and then the step S2 is carried out, or the step S2 is firstly carried out and then the step S1 is carried out. Compared with the prior art, the preparation method is high in preparation efficiency, the prepared positive electrode slurry is uniformly dispersed and good in stability, and the overall performance of the lithium ion battery can be improved.

The invention relates to the technical field of material preparation and electroanalytical chemistry, and concretely relates to a CoFe2O4NWs / RGO composite nano-material, and a paracetamol electrochemical sensor obtained through the composite nano-material. The composite nano-material is prepared through the following steps: S11, carrying out ultrasonic treatment on graphene oxide (GO) in water for 10-30 min, adding citric acid, and continuously carrying out ultrasonic treatment for 10-60 min to obtain a GO dispersion; S12, adding FeCl3.6H2O and CoCl2.6H2O to the GO dispersion, and carrying out ultrasonic treatment for 10-60 min; S13, adjusting the pH value of the above obtained dispersion to 9.5-10.5, adding hydrazine, stirring the dispersion and hydrazine for 30-120 min, and ageing the obtained mixture for 18-48 h; and S14, centrifuging the aged mixture, washing the centrifuged mixture, and drying the washed mixture to obtain the CoFe2O4NWs / RGO composite nano-material. An electrochemical electrode or the electrochemical sensor obtained through the composite nano-material has the advantages of good stability, low detection limit, high sensitivity and high selectivity in the paracetamol detection process.

The invention provides a solid phase-hydrothermal preparation method for lithium vanadium phosphate. The method comprises the following process steps that (1) providing materials of vanadium, phosphate radicals and carbon are metered according to a mol ratio of vanadium: phosphate radicals: carbon being 1:1:(1-10), dispersing agents are added for ball milling, obtained paste is dried and is then crushed, the materials are heated to 650 to 900 DEG C for heat insulation for 4 to 10 hours under the inert gas protection, the materials are naturally cooled to the room temperature along with a furnace to obtain VPO4 / C intermediates; (2) providing materials of lithium and phosphate radicals and the intermediates are metered according to a mol ratio of lithium: phosphate radicals: intermediates being 3:1:2, the providing materials of lithium and phosphate radicals are respectively prepared into water solution, water solution of the providing materials of the phosphate radicals is added into the water solution of the providing materials of lithium to form mixing solution, the intermediates are added into the mixed solution, water is added for dilution, then, the materials are transferred to a sealed high-pressure reaction kettle, are heated to 200 to 280 DEG C for heat insulation for 2 to 20 hours and are filtered, and filter cake is subjected to vacuum drying to obtain black powder; and (3) the black powder is heated to 600 to 850 DEG C for heat insulation for 1 to 10 hours under the inert gas protection, and the lithium vanadium phosphate is obtained.

The invention belongs to the technical field of inorganic materials, and specifically relates to a preparation method for a tungsten disulfide / MXene composite material. The preparation method comprises the following steps: (1) adding lithium fluoride into a hydrochloric acid solution so as to obtain an etching solution; (2) adding Ti3AlC2 into the etching solution, carrying out an etching reaction, and carrying out washing, centrifuging and vacuum drying so as to obtain a two-dimensional layered MXene material Ti3C2; and (3) dispersing the MXene material Ti3C2 into deionized water, then addingsodium tungstate dihydrate, thiourea and oxalic acid, carrying out uniform mixing under stirring, carrying out a hydrothermal reaction, and carrying out centrifuging, washing and drying so as to obtain the tungsten disulfide / MXene composite material. The tungsten disulfide / MXene composite material prepared by using the method provided by the invention has uniform morphology and good dispersity; meanwhile, the preparation method is simple and easily-controllable, has low cost, and is applicable to large-scale industrial production.

The invention relates to a process for preparing rutile phase nano-titanium dioxide powder comprising, choosing carrying agent and dispersion medium, making the hydrolysis product and the carrying agent in the dispersion medium co-precipitate by controlling the hydrolysis speed of the titanate under the action of a finite supersonic wave frequency and power, then rinshing by water and alcohol, heating to remove the carrying agent, thus obtaining the rutile phase nano titanium dioxide with 7-40nm grain size.

The invention provides a preparation method of seaweed polyester master batch. According to the seaweed polyester master batch, the content of seaweed extract is 0.1-5%. The preparation method comprises a step of preparing a seaweed modifier. In the step of preparing the seaweed modifier, the seaweed extract, negative ion powder, calcium stearate, dodecyl dimethyl benzyl ammonium chloride and an ethanol-water solution are mixed, and stirred at a speed of 2000-2500rpm for 5-6h to obtain the seaweed modifier, wherein the volume ratio of ethanol in the ethanol-water solution is 6-8%. The preparation method further comprises the steps of preparing a loading agent, preparing master batch modified powder and preparing the seaweed polyester master batch. The dispersion degree and the uniformity degree of seaweed active ingredients in the prepared seaweed polyester master batch are remarkably improved, and no obvious agglomeration phenomenon occurs. A good inhibition effect is achieved. The seaweed polyester master batch has relatively strong negative ion and far-infrared effects.

The invention discloses a nanometer platinum-copper alloy catalytic material for electrolysis of water. The nanometer platinum-copper alloy catalytic material for electrolysis of water is prepared by using electrospinning technique and chemical vapor deposition; platinum-copper alloy nanoparticles are uniformly dispersed on carbon nanofibers, and the nanoparticles are free of obvious agglomeration, small in particle size and uniform in distribution and have a great number of active sites, thereby improving the catalytic activity of the material; and a preparation method for the nanometer platinum-copper alloy catalytic material is simple in process flow, free of production of toxic substances, friendly to environment, free of pollution and good in repeatability, and has good industrial application prospect.

The invention relates to an in-site silver nano-particle / polymer composite molecular film and a preparation method thereof. The film is provided with at least one double-layer composite film of a poly(allylamine) hydrochloride film and a polyacrylic acid film which contain silver nano-particles. The method adopts molecular deposition (MD) technology to prepare an AgCl2 doped polyelectrolyte molecular deposition film on a substrate first, and then utilizes sodium borohydride (NaBH4) solution to reduce AgCl2 into Ag nano-particles by adopting a method of in-situ reduction, thereby obtaining the in-site silver nano-particle / polymer composite molecular film. The film belongs to a nanometer ultra-thin film; and the molecular ultra-thin film has good lubricating property, and can improve the abrasion resistance of a polyelectrolyte film.

The invention discloses a formula milk powder for pregnant and lying-in women and a preparation method thereof. The formula milk powder comprises: 30%-55% of skimmed milk powder, 30%-55% of whole milkpowder, 1%-8% of inulin, 1%-8% of galactooligosaccharide, 1%-6% of hydrolyzed whey protein powder, 0.2%-1.2% of calcium carbonate, 0.1%-1.1% of docosahexaenoic acid grease, 0.1%-1% of lactose, 0.1%-0.8% of minerals, 0.1%-0.7% of vitamins and 0.02% of bifidobacterium lactis HN019 freeze-dried powder. According to the formula milk powder, the inulin and the galactooligosaccharide serve as strengthening factors of the Bifidobacterium lactis HN019, the concentration of the Bifidobacterium lactis in excrement of pregnant women is increased, constipation is prevented or relieved, intestinal peristalsis is stimulated, excrement wettability is improved, intestinal flora balance and intestinal health are maintained, and absorption of vitamin B1, zinc and other microelements by pregnant and lying-in women is improved. Experimental results show that after the milk powder is eaten, the concentration of Bifidobacteria in the excrement of the pregnant women reaches 10<10> cfu / g or above, and the concentration of the Bifidobacteria in intestinal tracts is obviously increased. The formula and the process of the milk powder can also effectively improve the problem of wall adhesion in a spray drying stage.

The invention provides a graphene, a preparation method thereof and a micro-jet device and relates to the technical field of a nanometer carbon material. The micro-jet device provided by the invention can adjust a throttling area by changing an annular clearance between a valve element and a valve base under the synergic effect of the valve element and the valve base under high pressure, so as to generate a high-speed jet and realize the peeling, smashing, shearing and refining for a graphene sheet, wherein the valve element is made from a diamond material, so that the powder in higher hardness can be prepared while the defects of incapability of resisting abrasion, easiness in damage and frequent replacement of the traditional element can be overcome, and meanwhile, a slit type channel is arranged on the valve base so as to allow the graphene in larger grain size to pass, so that the technical problem of easiness in blocking of a traditional needle-shaped jet orifice can be solved. The invention also provides the preparation method for the graphene. The micro-jet device is applied to the preparation method. The process is simple, the operation is convenient, the energy consumption is low, no waste gas or wastewater is generated, the method is safe and environmentally friendly and the method is suitable for industrial production.

The invention discloses a matrix modifier for determining heavy metals absorbed by graphite furnace atoms, and a preparing method. The matrix modifier is colloid palladium, and the preparing method of the matrix modifier comprises the following steps of: weighing 0.024g-0.036g of palladium chloride, and placing into a reacting container; converting into H2PdC14.nH2O by using concentrated hydrochloric acid; adding 0.030g of polyvinylpyrrolidone; then, slowly adding 60mL of mixing solution of methanol and water, continuously stirring and uniformly mixing in the adding process, placing the solution into a water bath tank for refluxing by heating for 90 minutes, and then taking out a brown colloid solution which is the target palladium. The novel matrix modifier can achieve high podzolizing temperature, the interference matrix can be effectively removed in the podzolizing stage, and the purpose for reducing or eliminating the interference is achieved. The colloid palladium prepared by the invention has uniform particle distribution, and no obvious aggregation phenomenon.

The invention relates to the field of nickel-cobalt-manganese ternary precursor manufacturing, and in particular, relates to a high-voltage nickel-cobalt-manganese ternary precursor and a preparation method thereof. The preparation method comprises the steps: mixing a nickel-cobalt-manganese ternary metal salt solution, a carbonate solution, a complexing agent solution and a first base solution, carrying out a co-precipitation reaction, and carrying out solid-liquid separation after precipitate reaches a required particle size range to obtain a nickel-cobalt-manganese composite basic carbonate seed crystal; and mixing the nickel-cobalt-manganese ternary metal salt solution, a precipitant solution, the ammonia water solution and a second base solution containing the nickel-cobalt-manganese composite basic carbonate seed crystal, enabling the nickel-cobalt-manganese composite basic carbonate seed crystal to continuously grow, and after the seed crystal reaches the required particle size range, carrying out solid-liquid separation, drying, batch mixing, sieving and demagnetizing to obtain the ternary precursor, wherein the core of the ternary precursor is nickel-cobalt-manganese composite basic carbonate, and the shell of the ternary precursor is nickel-cobalt-manganese composite hydroxide. A battery assembled by a ternary positive electrode material prepared from the precursor shows high discharge capacity, high first coulombic efficiency and excellent rate capability under 4.5 V high cut-off voltage.

The invention discloses a terpenyl ester hyperdispersant and a preparation method for the same. The preparation method comprises the following steps of feeding 100 parts by weight of terpene resin, 25 to 50 parts by weight of an alpha,beta-unsaturated compound and 0.1 to 1.5 parts by weight of a catalyst into a reaction kettle, slowly raising the temperature to 160 to 200 DEG C under the protection of nitrogen, performing reaction with stirring for 4 to 6h, adding 1 to 50 parts by weight of a modified carboxylation reagent and 20 to 60 parts by weight of dihydric alcohol, continuing performing reaction for 3 to 4h, then gradually raising the temperature to 220 to 260 DEG C, performing condensation polymerization reaction for 8 to 10h under the vacuum condition of 500 to 2,000Pa, and cooling to obtain the terpenyl ester hyperdispersant after reaction is finished. The hyperdispersant can be widely applied to the preparation and the dispersion of inorganic superfine powder.

The invention discloses a method for preparing a unified-size and uniformly-dispersed PI / SiO2 nanocomposite film in a novel coupling way, relating to a method for preparing a PI / SiO2 nanocomposite film and aiming to solve the problems of non-uniform distribution and aggregation of nanoparticles in a polyimide matrix in the existing PI / SiO2 nanocomposite film preparation process. The method comprises the steps of adding a coupling agent into a system on the basis of the traditional sol-gel polymerization method, and connecting SiO2 and a PI matrix together in a novel coupling way to prepare the unified-size and uniformly-dispersed PI / SiO2 nanocomposite film serving as a novel industrial material. The method is used for preparing the PI / SiO2 nanocomposite film.

The invention discloses a preparation method and application of a nano zinc oxide photocatalyst. The preparation method takes polyvinyl alcohol (PVA) and zinc nitrate hexahydrate [Zn(NO3)2.6H2O] as raw materials, and comprises the following steps: firstly, preparing a polyvinyl alcohol-zinc nitrate mixture water solution; secondly, removing water in the mixture water solution by adopting a vacuum freezing and drying technology to obtain a polyvinyl alcohol-zinc nitrate white foam-shaped solid; finally, calcining the solid to obtain a product nano zinc oxide powder. The preparation process disclosed by the invention has a simple flow, the raw materials are easily obtained and a preparation process is clean and has no pollution; the nano zinc oxide powder prepared by adopting the vacuum freezing and drying technology is not agglomerated and has high purity and crystallization degree; the nano zinc oxide photocatalyst has good photocatalytic activity on an azo congo red dye and an anthraquinone active brilliant blue KN-R dye under ultraviolet light, and has a good application prospect in the aspect of organic dye wastewater treatment.

The invention discloses an electrolytic water catalytic material of a gold-copper twin structure. The electrolytic water catalytic material is a nano-particle / carbon nanofiber hybrid material of the gold-copper twin structure. According to the electrolytic water catalytic material, the size of the gold-copper twin structure nanometer material is uniform, no obvious agglomeration phenomenon exists, a large number of nanometer interfaces of the electrolytic water catalytic material can effectively improve the catalytic activity, and good stability and repeatability are achieved.

The invention provides a solid phase-hydrothermal preparation method for lithium vanadium phosphate. The method comprises the following process steps that (1) providing materials of vanadium, phosphate radicals and carbon are metered according to a mol ratio of vanadium: phosphate radicals: carbon being 1:1:(1-10), dispersing agents are added for ball milling, obtained paste is dried and is then crushed, the materials are heated to 650 to 900 DEG C for heat insulation for 4 to 10 hours under the inert gas protection, the materials are naturally cooled to the room temperature along with a furnace to obtain VPO4 / C intermediates; (2) providing materials of lithium and phosphate radicals and the intermediates are metered according to a mol ratio of lithium: phosphate radicals: intermediates being 3:1:2, the providing materials of lithium and phosphate radicals are respectively prepared into water solution, water solution of the providing materials of the phosphate radicals is added into the water solution of the providing materials of lithium to form mixing solution, the intermediates are added into the mixed solution, water is added for dilution, then, the materials are transferred to a sealed high-pressure reaction kettle, are heated to 200 to 280 DEG C for heat insulation for 2 to 20 hours and are filtered, and filter cake is subjected to vacuum drying to obtain black powder; and (3) the black powder is heated to 600 to 850 DEG C for heat insulation for 1 to 10 hours under the inert gas protection, and the lithium vanadium phosphate is obtained.

The invention provides a nano-metallic material, a preparation method of the nano-metallic material and micro-jet equipment and relates to the technical field of nano materials. According to the micro-jet equipment, the throttling area is adjusted by changing the circular gap between a valve core and a valve seat under the cooperative effect of the valve core and the valve seat under the high pressure, so that a high-speed jet is produced, and a metallic material is crushed, sheared and thinned; the valve core is made of a diamond material, metallic powder at the relatively high hardness can be prepared from the material, and thus the defects that a traditional valve core is not wear-resistant, is easy to damage and is required to be changed frequently are overcome; and meanwhile, a slit type passage is arranged on the valve seat for passing of the metallic material, so that the technical problem that a traditional needle-shaped jet port is blocked easily is solved. The invention further provides the preparation method of the nano-metallic material. The micro-jet equipment is adopted in the preparation method, and the preparation method is simple in technology, convenient to operate, low in energy consumption, small in heating value, safe, environment-friendly and suitable for industrial production.

The invention provides a silver-loaded nano cellulose, a preparation method thereof and an antibacterial composite material, and belongs to the technical field of functional materials. The preparationmethod comprises the following steps: mixing nano lignocellulose, tetramethyl piperidine oxide, NaBr and a Na2CO3-NaHCO3 buffer solution to obtain a nano lignocellulose suspension; mixing the nano lignocellulose suspension with a NaClO water solution, carrying out an oxidation reaction to obtain carboxylated nano lignocellulose; and mixing carboxylated nano lignocellulose, AgNO3, NaBH4 and water,and carrying out a reduction reaction under a dark condition to obtain the silver-loaded nano cellulose. By adopting the provided method, silver nano particles can be uniformly dispersed on the surface of the nano cellulose, the problem that silver nano particles are easy to agglomerate is solved; the silver-loaded nano cellulose is doped into a base material, and thus the obtained antibacterialcomposite material has an excellent antibacterial performance and also has excellent water resistance and mechanical properties.

The invention discloses a method for preparing high-purity nano indium oxide powder, which comprises a reaction box body for providing a purification reaction place, a bin gate is arranged on the reaction box body, a crucible for containing indium powder is arranged in the reaction box body, and a high-frequency induction coil for heating the crucible is arranged below the crucible. The O2 gas cylinder is connected with the reaction box body through a pipeline provided with a ball valve switch, the vacuum pump is connected with the reaction box body through a pipeline provided with a ball valve switch, and the reaction box body is further provided with a vacuum degree meter. By adopting the scheme, a special high-temperature reaction chamber and an atomizer do not need to be specially arranged. Compared with a precipitation method, the method does not generate waste liquid, does not need a washing and centrifuging process, does not need a high-temperature calcining link, and is beneficial to environmental protection and saving of water resources and energy. Compared with a solid-phase method, the indium vapor is oxidized with oxygen at high temperature, and the nano indium oxide powder with high purity, uniform particle size and high sintering activity can be prepared.

The invention relates to a polymeric composite in-situ growth nano-particle molecular film and a preparation method thereof. The film is provided with at least one composite film of a double-layer poly-dimethyldiallylammonium chloride film and a polyacrylic acid film containing copper sulfide nano-particles; and the film adopts molecular deposition technology to generate the copper sulfide nano-particles on a substrate by utilizing in-situ growth, thereby preparing the composite film containing the copper sulfide nano-particles. The nano-particles have even distribution in the film and no obvious agglomeration; and the composite film has the advantages of good wear resistance, low friction, and antiwear performance.

The invention discloses W-Cu composite powder with high thermal conductivity and low thermal expansion coefficient. The thermal conductivity is 200-235W / (m.K), and the thermal expansion coefficient is (5.6-9.3) * 10<-6> / K. The invention further discloses a preparation method of the W-Cu composite powder with high thermal conductivity and low thermal expansion coefficient. The preparation method comprises the following steps of: preparing a W-Cu precursor by adopting a wet chemical method; carrying out pyrolysis reduction on the W-Cu precursor in a hydrogen environment; and carrying out compression molding on the reduced W-Cu composite powder, then heating to 1100-1300 DEG C in a hydrogen atmosphere, carrying out heat preservation for 100-140 minutes, and cooling to obtain the W-Cu composite powder. According to the preparation method, the W-Cu composite precursor is prepared by adopting the wet chemical method, the W-Cu composite powder with high sintering activity is obtained through different reduction process combinations, and then the W-Cu composite powder with high density, high thermal conductivity, low thermal expansion coefficient and uniform tissue distribution is prepared through subsequent liquid phase sintering.

The invention discloses a modified graphene oxide epoxy resin composite coating and a preparation method thereof, and belongs to the technical field of material coatings. The coating comprises the following components: cerium oxide, an iron salt solution, epoxy resin, and graphene oxide. The preparation method comprises the following steps: firstly, preparing a graphene oxide dispersion liquid from a graphene oxide cake material, then synthesizing a cerium oxide-graphene oxide compound through a hydrothermal reaction, and finally, carrying out a hydrothermal reaction on the granular compound and a salt iron solution, and carrying out high-temperature calcination, thereby obtaining the product. The preparation method has the advantages of accessible raw materials, reasonable process route,no pollution in the preparation process, favorable corrosion resistance of the paint and the like, and is convenient to operate.

The invention belongs to the field of microbial technology and inorganic materials, and relates to an antibacterial film with bacterial cellulose loaded with gold nanosheets and a preparation method and application of the antibacterial film. The preparation method comprises the following steps: immersing a bacterial cellulose film into a 0.1 M NaOH solution at 90-95 DEG C, then washing the bacterial cellulose film with distilled water until the bacterial cellulose film is neutral, and carrying out vacuum drying to obtain a bacterial cellulose pure sample; and immersing the obtained bacterial cellulose pure sample into a chloroauric acid solution, conducting irradiating with ultraviolet light, conducting washing with deionized water after the ultraviolet light irradiation, and carrying out vacuum drying to obtain the antibacterial film with bacterial cellulose loaded with gold nanosheets. The preparation method of the ultraviolet light induced bacterial cellulose reduced gold nanosheet is simple, environment-friendly and reusable, and the bacterial cellulose has good biodegradability, so that the bacterial cellulose loaded gold nanosheet has good antibacterial ability and self-degradation ability.

The invention discloses a preparation method of nano-crystal boehmite, which comprises the following steps: (1) hydrolysis reaction: mixing distilled water and aluminum isopropoxide in a molar ratio of 50-150:1, heating to 70-90 ℃, react for 1~2h, filter the reaction product, and dry in an oven at 80-90℃ for 8-12h; (2) hydrothermal reaction, put the dried product in step (1) into a high-pressure reactor, and use distilled water as the reaction medium , the filling degree of the reactor is 60%-80%, the reaction temperature is 150-200°C, the reaction time is 4-12h, and the nano-crystal boehmite is obtained. The nano crystal boehmite product prepared by the invention has high crystallinity, regular crystal form, uniform particle size, simple dispersion condition and good dispersibility. And it has good water dispersibility, its dispersion condition is simple, the particle size distribution is uniform, and there is no obvious agglomeration phenomenon.

The invention discloses a preparation method of a magnetic graphene oxide-protamine / sodium carboxymethyl cellulose composite material, and belongs to the technical field of material synthesis and biological medicine. The method specifically comprises the steps that magnetic graphene oxide prepared after a graphene derivative loads ferroferric oxide serves as a matrix, a layer-by-layer self-assembly technology is adopted, and the matrix is sequentially coated with protamine and sodium carboxymethyl cellulose to form the composite. According to the method, the layer-by-layer self-assembly composite material has superparamagnetism and good dispersion performance and stability in water; natural protamine sulfate and sodium carboxymethyl cellulose are utilized as polyelectrolyte, nano-sized magnetic graphene oxide serves as a core, and all the materials have good biocompatibility; the material has certain magnetism, antineoplastic drugs are loaded on the cores of carriers, drug loading is stable, the drug loading quantity is large, and the drugs can have a targeted and sustained release function and better exert the therapeutic effect.

The invention belongs to the technical field of positive electrode materials for sodium ion batteries, and specifically discloses a preparation method of sodium vanadyl fluorophosphate positive electrode materials for sodium ion batteries. A fluorine source, a sodium source, and vanadyl phosphate are mixed to obtain a mixture, and then in a protective atmosphere, Roast at 650-900°C to get it. The preparation method of the present invention innovatively pre-converts the P source and the vanadium source in advance, and it is found that converting it into vanadyl phosphate, and then mixing it with the fluorine source and the sodium source, can unexpectedly significantly improve the electrical properties of the prepared material, In particular, the initial capacity performance and cycle stability of the material are significantly improved.