90results about How to "Particle size controllable" patented technology

The invention discloses a method for preparing nano cerium oxide through supergravity reinforcement, which comprises the following steps: 1) completely dissolving cerium chloride hexahydrate serving as a cerium source with deionized water to prepare a cerium chloride solution; (2) inputting the cerium chloride solution into a supergravity reactor through a peristaltic pump at normal temperature, then inputting ammonia water into the supergravity reactor through a constant-flux pump, and carrying out premixing reaction in the supergravity reactor to form mixed slurry; and 3) after the premixing reaction is finished, taking out the mixed slurry, and carrying out suction filtration, washing, drying and high-temperature oxidation calcination to obtain the nano cerium oxide. According to the method, the production efficiency can be improved, the particle size of the prepared nano cerium oxide is small, the particle size distribution is narrowed, and the crystallinity of crystals is improved.

The invention provides a preparation method of an anti-blow-off porous carbon material for a silicon-carbon negative electrode, which comprises the following steps: (S1) preparing a solvent, an emulsifier and a nucleating agent into a mixed solution, adding a resin oligomer and a curing agent, polymerizing into spherical resin under the condition of stirring at 40-80 DEG C, and drying and agglomerating into blocks; the emulsifier comprises a micromolecule anionic surfactant and a polymer emulsifier; (S2) crushing and screening to obtain spherical agglomerates with proper particle sizes, and pyrolyzing and carbonizing the spherical agglomerates in an inert atmosphere to obtain pyrolytic carbon; (S3) performing activated pore-forming on the pyrolytic carbon in an activated atmosphere to obtain an activated carbon aggregate; and (S4) depolymerizing and separating the activated carbon aggregate to obtain the porous carbon material. According to the invention, the spherical particles are greatly agglomerated, the pain point of gas blow-off in the industrial activation process is solved, the activation yield is improved, and meanwhile, the mechanical properties of the material can be adjusted by controlling the crosslinking degree.

The invention discloses a method for synthesizing ferric phosphate pyrophosphate and preparing a sodium ferric phosphate pyrophosphate positive electrode material. The method comprises the following steps: S1, preparing a raw material solution; s2, adding the ferric salt solution, the phosphate radical solution and the pyrophosphate radical solution into the reaction base solution, controlling the pH value, and carrying out coprecipitation reaction; s3, filtering and washing, adding water, and pulping again; s4, heating and crystallizing; s5, filtering and drying; s6, sintering to obtain ferric pyrophosphate Fe6 (PO4) 2 (P2O7) 3; s7, adding ferric pyrophosphate, a sodium source and a carbon source into water, pulping, and sanding; s8, spray drying; and S9, sintering is carried out, such that Na4Fe3 (PO4) 2 (P2O7) / C is obtained. According to the method, a precursor Fe6 (PO4) 2 (P2O7) 3 is synthesized firstly, long-range ordered mixing of Fe and P elements on the atomic scale is achieved, the morphology and particle size of the precursor are controllable, the problem of generation of inactive impure-phase NaFePO4 in the synthesis process of ferric sodium pyrophosphate can be effectively solved, the raw material utilization rate is high, and the synthesized positive electrode material is large in tap density and compaction density and excellent in electrochemical performance.

The invention provides a platinum-based alloy catalyst, a preparation method thereof and a fuel cell. The method comprises the following steps: carrying out reduced pressure ball milling treatment on a non-metallic element doped carrier material, a platinum-based precursor and a transition metal-based precursor to obtain a platinum-based alloy catalyst precursor material; and carrying out reduction calcination treatment on the platinum-based alloy catalyst precursor material to obtain the platinum-based alloy catalyst. According to the preparation method, the platinum-based alloy catalyst with controllable particle size, good oxygen reduction reaction (ORR) performance and stability can be prepared without using an organic solvent by adopting a method of combining reduced pressure ball milling and reduction calcination treatment.

The invention belongs to the technical field of agricultural nanoparticle preparations, and relates to a dopamine nanoparticle for relieving plant salt stress and a preparation method thereof. And adding the double-ligand chelated dopamine solution into the lignin-based nano-particle suspension, and stirring to obtain the lignin-based nano-particle suspension. According to the invention, metal ions are adopted as a connecting bridge and are respectively chelated with dopamine and ethylenediamine tetraacetic acid salt, so that double-ligand chelated dopamine is obtained, and the self-polymerization behavior of dopamine is inhibited. The invention also provides a method for loading dopamine by using lignin-based nanoparticles. The self-polymerization of the dopamine is further inhibited; the adsorption of the soil on the dopamine is reduced, and the utilization rate of the dopamine is improved.

The invention discloses a nitrogen-sulfur double-doped PtM / C catalyst as well as a synthesis method and application thereof. The synthesis method comprises the following steps: 1) mixing an organic ligand, a noble metal Pt precursor, an M precursor and a carbon carrier with a non-organic solvent, and drying to obtain a catalyst precursor; wherein M in the M precursor is a transition metal element, the organic ligand comprises doping elements, and the doping elements comprise N and S; and 2) carrying out first calcination on the catalyst precursor in a reducing atmosphere to obtain the nitrogen-sulfur double-doped PtM / C catalyst. According to the method disclosed by the invention, the organic ligand, the noble metal Pt precursor, the M precursor and the carbon carrier are mixed with the non-organic solvent, so that the agglomeration of nanoparticles can be better inhibited, and the performance of the catalyst is improved. In addition, double doping of N and S elements can achieve a synergistic effect. No organic solvent is needed, no organic waste liquid is generated, and the method is environment-friendly and suitable for large-scale production.

The invention discloses a sulfuric acid method titanium dioxide hydrolysis seed crystal, titanium dioxide and a preparation method thereof. The preparation method comprises the following steps: 1, respectively preheating a titanyl sulfate solution and an alkali solution; step 2, introducing the preheated titanyl sulfate solution and alkali solution into a micro-channel reactor at a flow rate of 5-15 mL / min, and reacting for 2-10 min at a temperature of 85-95 DEG C to prepare a seed crystal; and step 3, cooling the seed crystal prepared in the step 2. The titanium dioxide prepared by the method is uniform and controllable in particle size, and the process is simple and easy to implement. The titanium dioxide prepared by using the seed crystal is pigment-grade titanium dioxide, the D90 of the titanium dioxide is 0.5-0.6 mu m, the L * of the titanium dioxide is 98.70-98.75, the b * of the titanium dioxide is 1.40-1.55, and the lightening power of the titanium dioxide is 110-115%.

The invention discloses immobilized lipase based on carboxymethyl chitosan / lignin cross-linked composite microspheres as well as preparation and application of the immobilized lipase. The preparation method comprises the following steps: mixing a lignin solution with formaldehyde and an amination modifier for reaction to obtain aminated lignin, and reacting the aminated lignin with EDC / NHS and a carboxylation modifier to obtain aminated-carboxylated modified lignin; mixing lipase, carboxymethyl chitosan, modified lignin and water as a water phase, mixing the water phase with an oil phase containing a surfactant, and emulsifying to form a W / O emulsion; and dropwise adding an EDC / NHS solution into the W / O emulsion to complete a cross-linking reaction, removing an oil phase, and washing to obtain the immobilized lipase based on the carboxymethyl chitosan / lignin cross-linked composite microspheres. The method is good in balling effect and controllable in particle size; the immobilized lipase based on the carboxymethyl chitosan / lignin cross-linked composite microspheres has good biocompatibility, is biodegradable, has good mechanical properties and catalytic performance, and has huge application potential.

The invention relates to the technical field of nano powder material preparation, in particular to a method for preparing molybdenum powder with controllable granularity and the molybdenum powder. The method for preparing the molybdenum powder with the controllable granularity comprises the steps that molybdenum salt and a pore forming agent are dissolved in water at the room temperature, and a mixed solution is obtained; drying the mixed solution to obtain a nano mixture of molybdenum salt coated with a pore-forming agent; roasting the nano mixture in an oxygen-containing atmosphere to obtain superfine molybdenum trioxide powder; the molybdenum trioxide powder is subjected to first-stage hydrogen reduction treatment, and superfine molybdenum dioxide powder without preferred orientation is obtained by adjusting the hydrogen dew point and the temperature field in the reduction process; and carrying out two-stage hydrogen reduction treatment on the superfine molybdenum dioxide powder to obtain molybdenum powder, and grinding and dispersing the molybdenum powder to obtain the superfine molybdenum powder. According to the preparation method, the superfine molybdenum powder with good uniformity and dispersity and controllable granularity can be prepared.

The invention belongs to the technical field of precious metal materials, and particularly relates to crystal face sphere-like silver powder and a preparation method and application thereof. The preparation method of the crystal face sphere-like silver powder comprises the following steps that a first silver nitrate solution, a first reducing agent solution, a stabilizer and a surfactant are mixed, and a colloidal solution is obtained; mixing the colloidal solution and the neutralizer solution to obtain a reaction base solution; and a second silver nitrate solution and a second reducing agent solution are added into the reaction base solution at the same time and then mixed with a dispersing agent, and the crystal face sphere-like silver powder is obtained. According to the preparation method provided by the invention, the colloidal solution is prepared as the seed crystal, the liquid-phase reduction reaction is carried out in a manner of simultaneously adding the reducing agent solution and the oxidizing agent solution, the crystal face silver powder with a novel structure is obtained, and the prepared silver powder has relatively good dispersity, consistency and crystal face sphericity-like degree and also shows relatively high sintering activity; therefore, the conductive ink has a good printing effect and conductive performance, and has a wide application prospect.

The invention relates to a preparation method of a cannabidiol nano-lipid carrier, in particular to a preparation method of a cannabidiol nano-lipid carrier with a transdermal absorption function. The invention aims to solve the problem that the existing cannabidiol lipid carrier cannot have high water solubility and high transdermal absorption function at the same time, and is poor in stability and easy to irritate skin. The method comprises the following steps: 1, weighing raw materials; 2, preparing an oil phase; 3, preparing a water phase; 4, mixing; 5, performing ultrasonic homogenization; 6, cooling; and 7, removing impurities. The preparation method is used for preparing the cannabidiol nano-lipid carrier with the transdermal absorption function.

The invention discloses a preparation method of beryllium powder for a beryllium rolled plate ingot, and belongs to the technical field of beryllium metals.The preparation method comprises the steps that under the closed condition, a 5-30 A motor current is adopted, beryllium chippings are subjected to disc smashing, and flaky crude beryllium powder with the particle size being 15-30 microns is obtained; under a closed condition, adopting a set airflow impact parameter to impact and crush the sheet-shaped coarse beryllium powder for 20-35 minutes, then detecting the particle size of the beryllium powder, and carrying out time-sharing adjustment on the frequency of a grading wheel in the airflow impact parameter according to the detection result of the particle size of the beryllium powder until the particle size of the beryllium powder meets a preset range of the particle size of the sheet-shaped fine beryllium powder, so as to obtain the sheet-shaped fine beryllium powder. Flaky fine beryllium powder is obtained; and S3, the flaky fine beryllium powder is sequentially subjected to acid pickling, water washing, alcohol washing, vacuum drying and powder screening. The beryllium powder is flaky powder, is stable in particle size, good in consistency and high in production efficiency, and meets the rolling performance requirements of rolled plate ingots.

The invention belongs to the field of metal powder manufacturing, and provides a superfine magnesium powder preparation device which comprises a smelting furnace, a vacuum pump, a spraying device, a collecting tower, a liquid storage tank, a first pressure pump and a second pressure pump, the spraying device comprises a venturi tube and a magnesium liquid conveying tube, and the venturi tube comprises an inlet, a throat tube and a spraying opening; the liquid storage tank is connected with an inlet of the venturi tube through a first pipeline, and a first pressure pump is arranged on the first pipeline; the other end of the magnesium liquid conveying pipe is inserted into the throat pipe; a vacuum pump is arranged on the smelting furnace; the smelting furnace is connected with the liquid storage tank through a second pipeline, and a second pressure pump is arranged on the second pipeline. And the venturi tube is connected with the upper end of the collecting tower through the jet orifice. As the venturi tube is adopted to prepare the magnesium powder, the magnesium powder with controllable particle size, small particle size distribution range and high roundness can be obtained; the activity of the magnesium powder is ensured by replacing oxygen in the preparation system with rare gas and controlling the environment humidity; the preparation equipment is simple in structure and free of moving parts, and equipment investment is greatly reduced.

The preparation method comprises the following steps: selecting PLGA (poly (lactic-co-glycolic acid)) with biocompatibility and biodegradability as a carrier material, loading an immunopotentiator alpha-tocopherol on PLGA nano-particles, and preparing the nano-particle immunologic adjuvant by using a nano-precipitation method, so as to obtain the nano-particle immunologic adjuvant with an immune synergistic effect. By controlling the polymer concentration and the drug concentration in the preparation process, the average particle size of the drug-loaded nano-particles is 90-120nm, the monodispersion coefficient is less than 0.2, the particle size of the product is uniform and stable, the encapsulation efficiency reaches 80% or more, the content of alpha-tocopherol in the nano-particles is 1-30%, and the drug-loaded nano-particles have a sustained-release effect of one month or more. The PLGA nanoparticles loaded with alpha-tocopherol can promote proliferation of mouse macrophages and enhance secretion of cell inflammatory cytokines and expression of surface costimulatory molecules, have a synergistic enhancement effect of the PLGA nanoparticles and alpha-tocopherol, and can be used as an effective immunologic adjuvant.

The invention provides a porous radiation refrigeration flexible film as well as a preparation method and application thereof, the preparation method comprises the following steps: (1) mixing a NaCl saturated aqueous solution with ethanol, then carrying out ultrasonic treatment on the mixed solution, then centrifugally collecting NaCl to separate out crystals, and drying to obtain superfine NaCl particles; and (2) mixing a PDMS precursor with a curing agent to obtain a PDMS mixed solution, mixing the PDMS mixed solution with the superfine NaCl particles, pouring the mixture into a mold, curing, immersing in a water bath to remove NaCl, and drying to obtain the porous radiation refrigeration flexible film. NaCl particles with small particle size and narrower particle size distribution are prepared by adopting an ultrasonic precipitation method; the porous PDMS film prepared by taking the NaCl particles as a sacrificial template has a better radiation refrigeration effect.

The invention belongs to the technical field of cosmetics, and particularly relates to a cosmetic delivery system based on a natural wall material, a preparation method and application. The cosmetic delivery system is of a core-shell structure, a core is a cosmetic active component, and a shell layer is a composite polymer gel network of sodium alginate, sophorolipid and cellulose. The natural polysaccharide composite wall material is green and safe, has good biocompatibility and strong compatibility with cosmetic formulas, and does not irritate the skin. The delivery system can effectively protect cosmetic active ingredients from being damaged by illumination and oxygen, and the storage stability of the active ingredients is remarkably improved; meanwhile, slow release and targeted transdermal absorption of active ingredients are realized, and the bioavailability is improved.

The invention provides calcium phosphate nanoparticles containing polyphosphate or polyphosphoric acid, a preparation method of the calcium phosphate nanoparticles and application of the calcium phosphate nanoparticles in hard tissue repair products, the diameter of the calcium phosphate nanoparticles is 1 nm-10 microns, and the mass fraction of the polyphosphate or the polyphosphoric acid in the calcium phosphate nanoparticles is 10-80%; the calcium-phosphorus composite material is obtained by mixing a calcium-containing solution and a phosphorus-containing solution, the phosphorus-containing solution comprises polyphosphate or polyphosphoric acid and phosphate or phosphoric acid, and the concentration of polyphosphate or polyphosphoric acid in the phosphorus-containing solution is 0.1-500 mg / mL. The calcium phosphate nanoparticles containing polyphosphate or polyphosphoric acid have the advantages of small size, controllable particle size and high biological safety, the preparation method is simple to operate and low in cost, and large-scale preparation of the calcium phosphate nanoparticles can be realized; the collagen fibers can be effectively mineralized, the hard tissues such as bones and enamel can be repaired, and the method has a wide application prospect.

The invention relates to the field of catalyst preparation methods, in particular to a preparation method of a carbon nanotube catalyst for hydrogen production through methane cracking. The method comprises the following steps: S1, synthesizing hydrated alumina precursor loaded iron-nickel alloy nanoparticles by adopting a one-step method; and S2, in an inert gas atmosphere, roasting the iron-nickel alloy nanoparticles to prepare the aluminum oxide loaded iron-nickel alloy nanoparticle catalyst. According to the invention, hydrated alumina precursor-loaded iron-nickel alloy nanoparticles are synthesized by a one-step method, and then are roasted in an inert gas atmosphere to prepare the alumina-loaded iron-nickel catalyst. The catalyst prepared by the method can reach a nanometer level, is controllable in particle size, high in dispersity and uniform and adjustable in composition, and shows good catalytic performance on high-temperature methane cracking reaction. Compared with the prior art, the method is simple in process and can be used for large-scale synthesis.

This invention discloses silicon carbide particles and their preparation method, relating to the field of semiconductor technology. Silicon carbide particles with controllable particle size are prepared using a reaction system including a fluidized bed, with an average particle size of 3mm-11mm. The fluidized bed includes nozzles on the inner side of a cone wall, and the focusing point and flow rate of the fluid ejected from the nozzles are set. By controlling the flow rate of the fluid ejected from the nozzles, the particle size of the finished product is precisely controlled, reducing the defect rate caused by substandard particle size and achieving a high particle size yield. The product has controllable particle size and high purity, avoiding the risks introduced by crushing and screening. Furthermore, the production process does not require the disassembly and assembly of a single furnace, enabling continuous production, simplifying the production process, reducing input costs, ensuring product quality, and improving production efficiency, providing a new approach for future industrialization.

The invention relates to the technical field of immune carriers, in particular to immune carrier microspheres loaded with individualized MHC-II binding polypeptide and vaccine preparation and application of the immune carrier microspheres loaded with the individualized MHC-II binding polypeptide. The core microsphere is loaded with individualized MHC-II binding polypeptide, the sequence of the MHC-II binding polypeptide is obtained by predicting and screening based on an HLA genotyping result, and each HLA allele corresponds to at least one high-affinity MHC-II binding polypeptide; and the shell is a glucan or other polymer coating layer. The preparation method has the advantages that the T epitope and the B epitope are separately subjected to immune competitive inhibition inside and outside the microspheres, so that a better immune effect is obtained. The antibody avoids cross reaction side effects; carrier molecule diversity is reduced, and side effects caused by T cell over-activation are avoided; th1 epitopes and Th2 epitopes can be contained in the microspheres, so that antibody immunity and T cell immunity functions are generated; the particle size of the microspheres is controllable, and the immunologic function can be achieved without adjuvants.

The invention provides a mercury ion detection method based on a paper chip, and belongs to the technical field of mercury ion detection. The mercury ion detection method based on the paper chip comprises the following steps: firstly preparing nanogold, then preparing graphene quantum dots, mixing the nanogold and the graphene quantum dots to obtain a nanogold-graphene quantum dot compound, and then dropwise adding the nanogold-graphene quantum dot compound to filter paper to obtain a nanogold-graphene quantum dot paper chip, the paper chip is used for detecting the mercury ion concentration of a to-be-detected sample. According to the invention, sodium borohydride is used as a reducing agent and sodium citrate is used as a stabilizer to prepare nanogold, so that the particle size of the nanogold is more controllable, the particle size of the nanogold-graphene quantum dot compound obtained by combining with the graphene quantum dots is smaller, and the nanogold-graphene quantum dot compound is more tightly combined with mercury ions during detection; and finally, the result of measuring the mercury ion concentration by adopting the paper chip is more accurate.

The application discloses a method for preparing mesoporous zeolite under normal temperature and pressure and application thereof, and the preparation method comprises the following steps: (1) preparation of a functional protein biomodule: cationic polypeptide is loaded on yeast to obtain a biomodule aqueous solution; (2) deposition of silicon and aluminum: the pH of the biomodule solution obtained in the step (1) is adjusted to neutral, then a silicon source, an aluminum source and a titanium source are added into the solution, and the solution is incubated on a shaking table for 3 days; (3) calcination: the solid obtained in the step (2) is collected by centrifugation, washed with ethanol and water alternately for 3 times, and calcined at 500 DEG C for 4h under an air atmosphere to obtain a zeolite molecular sieve adsorption material. The application can prepare porous molecular sieve small balls by using a simple method, and can provide a brand-new thought for synthesizing molecular sieve materials.

This invention relates to the field of oral care products technology, specifically to an artificial enzyme with antibacterial properties, its preparation method, and its application. This technical solution employs a chemical reduction method, where a palladium source reacts in an environment containing surfactants and reducing agents to obtain palladium nanozymes. The obtained palladium nanozymes exhibit uniform morphology, controllable particle size, good dispersibility in water, and good biocompatibility; they have no significant toxic side effects on human gingival fibroblasts, possess highly efficient catalase activity, and demonstrate strong antibacterial and bactericidal effects against oral pathogens, significantly reducing bacterial drug resistance; they can inhibit acid production by oral bacteria, preventing tooth decay; and they retain their original catalytic activity even after multiple cycles of use. Applying the palladium nanozymes of this solution to the manufacture of oral care products can solve the technical problems of unsatisfactory safety and easy development of drug resistance in existing oral care products using antibacterial and anti-caries methods, showing promising application prospects.

The application relates to a multifunctional spherical Prussian blue nanolaser and a preparation method and application thereof, and belongs to the field of nanobiological materials and biological medicine. The nanolaser takes spherical Prussian blue nanoparticles as a main body structure, has good near-infrared photothermal response performance and active oxygen (ROS) removal capacity, and can improve the superoxide dismutase (SOD)-like catalytic activity and antioxidant performance by doping metal elements such as ruthenium, bismuth and manganese. The nanolaser can generate a mild photothermal effect of 38-45 DEG C under near-infrared laser irradiation, and cooperatively remove excessive active oxygen in an inflammatory microenvironment, thereby reducing the expression of inflammatory factors and matrix metalloproteinases, inhibiting the activation of the iezo1 / Piezo2 / MMP13-related inflammatory and matrix degradation pathways, and relieving oxidative stress damage and inflammatory reactions. The nanolaser has the characteristics of uniform particle size, good dispersibility, high stability and excellent biocompatibility, and can be used for the prevention of diseases such as osteoarthritis and rheumatoid arthritis. The application constructs a nanolaser system with mild photothermal regulation and antioxidant activity.

This invention discloses a method for preparing zeolite molecular sieves with precisely adjustable particle size, comprising the following steps: (1) adding aluminum source and other raw materials to deionized water and stirring evenly at room temperature; (2) adding silicon source, stirring at room temperature, and then adding template agent to obtain precursor slurry; (3) adding zeolite molecular sieve, the amount of zeolite molecular sieve being 1-15 mg / g of precursor slurry, transferring the precursor slurry to a high-pressure reactor, fixing it on a homogeneous reactor, heating to 0-150℃, maintaining for 1-200 h, and then heating to 160-230℃ for 3 hours to crystallize for 6-96 h; (4) obtaining zeolite molecular sieve after centrifugal washing, drying, and calcination. The innovation of the preparation method of this invention lies in the first use of a two-stage synthesis method, which can gradually reduce the particle size of the zeolite molecular sieve product while increasing the yield of zeolite molecular sieves. This method successfully synthesized SAPO-34 zeolite molecular sieve with a particle size deviation of less than 0.4 μm and ZSM-5 zeolite molecular sieve with a particle size deviation of less than 0.2 μm.

The invention discloses ship lock large-volume air-entraining concrete and a pouring vibration exhaust method, and belongs to the technical field of concrete.The ship lock large-volume air-entraining concrete is prepared from 130-160 kg / m < 3 > of cement, 50-70 kg / m < 3 > of fly ash, 50-70 kg / m < 3 > of mineral powder, 600-750 kg / m < 3 > of sand, 1300-1500 kg / m < 3 > of gravel, 3-5 kg / m < 3 > of a water reducing agent, 90-130 kg / m < 3 > of water and 3-4 kg / m < 3 > of an air-entraining anti-cracking agent according to the mixing proportion; a nano-scale super absorbent material is adopted as an air-entraining anti-cracking agent, internal humidity is maintained and a temperature peak value is reduced through water absorption and slow water release, and corresponding nano micropores are reserved in a microstructure through water release and polymer shrinkage, so that the effects of enhancing mechanical properties and resisting cracking after air entraining are achieved.

The invention relates to the technical field of lithium battery diaphragms, in particular to an aramid fiber water-dispersible nano-microsphere, coating slurry, a diaphragm and a preparation method.The preparation method of the aramid fiber water-dispersible nano-microsphere comprises the steps that a diamine monomer, a first dispersing agent and an acid-binding agent are dissolved in deionized water to obtain a water-phase system; dissolving a diformyl chloride monomer in chloroform to obtain an oil phase system; slowly adding the oil-phase system into the water-phase system under the condition of high-speed homogenization to carry out polymerization reaction, and finally carrying out solid-liquid separation, water washing and blending to obtain a water system of the aramid fiber water-dispersible nano-microspheres. According to the preparation method disclosed by the invention, the nanoscale water dispersible microspheres with a relatively large specific surface area are prepared in an interfacial polymerization manner, the particle size of the microspheres is controllable, the thermal stability is good, the microspheres can be stably dispersed in water, and the liquid absorption rate of the diaphragm can be greatly improved; and the coating diaphragm with relatively high diaphragm rupture temperature, relatively low thermal shrinkage and good electrolyte wettability is prepared.

The invention provides lightweight high-strength ceramsite and a preparation method thereof, and the lightweight high-strength ceramsite is prepared from the following raw materials in parts by weight: 30-45 parts of sulfonated water-based drilling cuttings, 3-9 parts of lignin, 0.3-0.9 part of a nano titanium dioxide photocatalyst, 10-25 parts of alumina tailings, 5-15 parts of red mud and 10-25 parts of fly ash. According to the lightweight high-strength ceramsite and the preparation method thereof, sulfonated water-based drilling cuttings and other industrial solid wastes are treated in a maximized, harmless and resourceful manner, and a lightweight high-strength ceramsite product is obtained.

The invention provides a preparation method of collagen microspheres, which comprises the following steps: dissolving collagen in an acid solution to obtain a first solution; dissolving an inert macromolecular crowding agent in water to obtain a second solution; obtaining an oil phase; respectively injecting the first solution, the second solution and the oil phase into a first channel, a second channel and a third channel of a three-channel microfluidic device; pressure is applied to the first channel, the second channel and the third channel, so that the first solution sequentially flows through the first junction of the first channel and the second channel and the second junction of the first channel and the third channel in the first channel; and collecting effluent at the outlet of the first channel to obtain the collagen microspheres. The invention also provides a collagen microsphere. The collagen microsphere comprises collagen, an inert macromolecular crowding agent and an oil phase. According to the method provided by the invention, uniform particle size of the microspheres can be ensured in the preparation process; toxic and harmful components are not added; and mass production of microspheres can be realized, and the industrialization degree is high.

The invention relates to a preparation method of high-purity short-chain silicon dioxide sol with a controllable particle size. The preparation method comprises the following steps: firstly, preparing long-chain silica sol seed crystal particles by using active silicic acid under an acidic condition; adjusting the liquid environment of a seed crystal system and adjusting the pH value to be alkaline, and adding alkoxy silane to grow particles; and finally, adding water for dilution, and preparing a high-purity short-chain silicon dioxide sol aqueous solution with the mass fraction of 5-20% by adopting a reduced pressure distillation mode. According to the method, the high-purity short-chain silicon dioxide sol particles with controllable particle sizes can be effectively prepared by adjusting the pH of the seed crystal preparation and seed crystal growth stages, and the method is high in repeatability and strong in controllability.