645 results about "Solvent evaporation" patented technology

The invention belongs to the technical field of membrane separation, and aims to provide a preparation method and application of a covalent organic framework bipolar membrane. The method comprises the following steps: combining at least one amine, hydrazide or aldehyde monomer containing ionic groups with a monomer without ionic groups, and respectively synthesizing covalent organic framework COF nanosheets with positive charges and negative charges through a one-pot method under the condition of coexistence of an acid catalyst and an organic solvent; sequentially depositing COF nanosheets with positive and negative charges on the surface of the porous carrier by a hot solvent evaporation method; by constructing two COF separation layers with regular pore channels and opposite electrical properties, the covalent organic framework bipolar membrane with charge asymmetry is finally obtained. The product provided by the invention has high selectivity, can realize efficient separation of protons and metal cations, and significantly improves the extraction and recovery purity of hydrochloric acid; through charge repulsion and pore size screening mechanisms, separation of different anions can be further realized, and selective recovery of acid molecules is enhanced.

The invention discloses a compound molecular sieve ozone catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: mixing molecular sieve powder with a low silica-alumina ratio and a salt solution of an active component, heating and stirring the mixed solution to evaporate the solvent, washing, drying, calcining and grinding the residual solid to obtain the compound molecular sieve ozone catalyst. Active component loaded hydrophilic molecular sieve powder is obtained; the preparation method comprises the following steps: mixing all-silicon molecular sieve powder and an NH4F aqueous solution, carrying out a hydrothermal reaction, and after the reaction is finished, washing, drying, calcining and grinding an obtained solid material to obtain fluorinated modified hydrophobic molecular sieve powder; mixing the active component loaded hydrophilic molecular sieve powder, the fluorinated modified hydrophobic molecular sieve powder, an inorganic binder and a pore forming agent, and granulating to obtain spherical catalyst particles; and drying and calcining the spherical catalyst particles to obtain the compound molecular sieve ozone catalyst. The ozone catalyst provided by the invention improves the removal rate of refractory organics in reclaimed water.

The application discloses a kind of carbon nanotube / polyaniline composite modified epoxy resin conductive paint and preparation method thereof, belong to coating technical field.The application is prepared by preliminary disentangling carbon nanotube with specific solvent, and the carbon nanotube dispersion liquid uniformly dispersed is obtained;Afterwards, polyaniline is added to carbon nanotube dispersion liquid, and carbon nanotube / polyaniline composite is prepared by solvent evaporation or purification;Finally, carbon nanotube / polyaniline composite is compounded with epoxy resin, and high-performance carbon nanotube / polyaniline composite modified epoxy resin conductive paint is obtained.The carbon nanotube / polyaniline composite modified epoxy resin conductive paint prepared by the application has more excellent mechanical properties and electrical properties than traditional conductive paint, and can be better applied in aerospace, battery, communication, new energy and other aspects.

The invention relates to a method for recovering mixed salts (mainly containing calcium chloride, sodium chloride and potassium chloride) from a household garbage incineration fly ash leaching solution, and particularly provides two separation technical schemes. The traditional separation method generally needs to use a large amount of decalcifying agent, so that the cost is high, calcium chloride cannot be effectively recycled, and the problem of resource waste exists. In order to solve the problems, the invention selectively dissolves calcium chloride in the mixed salt by adopting a specific organic solvent (such as ethanol or methanol) and utilizing the characteristics that the solubility of calcium chloride in the solvent is high, the solubility of sodium chloride and potassium chloride is low, and the boiling point is relatively low. And a calcium chloride product can be recovered after solvent evaporation. Furthermore, the residual mixed salt is further washed using the specific organic solvent to remove entrained calcium chloride, thereby obtaining a mixed salt containing predominantly sodium chloride and potassium chloride. According to the technical scheme 1, the mixed salt subjected to separation and calcium removal is subjected to dissolution treatment under the high-temperature condition, potassium chloride is dissolved, the particle size of sodium chloride crystals is promoted to be increased, the sodium chloride crystals are obtained through solid-liquid separation, and then mother liquor is cooled and crystallized to recover potassium chloride. According to the technical scheme 2, the mixed salt subjected to separation and calcium removal is subjected to aging treatment so as to promote particle size increase of sodium chloride and potassium chloride crystals, then the aged mixed salt is separated by adopting a flotation method, and sodium chloride and potassium chloride products are recycled respectively.

The invention belongs to the field of cation exchange membranes, and discloses a monovalent selective cation exchange membrane with crown ether encapsulated in the membrane and a preparation method of the monovalent selective cation exchange membrane. Firstly, a sulfonated chloromethylated polymer is synthesized, a solvent is evaporated to form a membrane, and a chemical reaction of chloromethyl and amido contained in the membrane endows a growth site of a covalent organic framework. And then constructing a covalent organic framework in a membrane channel by an in-situ growth method, and packaging the crown ether nano material in the membrane. A regular porous channel of the covalent organic framework and a sulfonic acid group in the base membrane have a synergistic effect, so that good ion flux of monovalent ions is ensured. Meanwhile, the crown ether structure has a special recognition complexing effect on alkali metal ions and has different affinity to different metal ions, so that the monovalent cation selective separation is achieved, and the prepared monovalent selective cation exchange membrane is suitable for an electrodialysis process.

The invention provides a pregabalin slow-release type dissolving microneedle patch based on PLGA microspheres as well as a preparation method and application thereof. The method comprises the following steps: dissolving pregabalin and hyaluronic acid in deionized water to form an inner water phase (W1); dissolving PLGA in dichloromethane to form an organic phase (O); performing ultrasonic emulsification on the internal water phase and the organic phase to form W / O primary emulsion; rapidly adding the primary emulsion into an external water phase (W2) containing PVA and NaCl to form a W1 / O / W2 type multiple emulsion, and then carrying out solvent evaporation curing, centrifugal washing and freeze drying to obtain PLGA (at) PG microspheres; and uniformly dispersing the PLGA (at) PG microspheres in a hyaluronic acid solution, adding into a microneedle mold, vacuumizing, centrifuging, drying, and demolding the microneedle to obtain the dissolution type microneedle patch. By optimizing microsphere preparation, drug sustained release and microneedle patch preparation technologies are realized, and an efficient, safe and continuous local delivery platform is provided.

Embodiments herein generally relate to a method and system for oil recovery using solvent-assisted electric heating. In at least one example, the method comprises A method for oil production using solvent-assisted electric heating, comprising conveying liquid solvent into a subsurface formation; operating at least one downhole electric heater to vaporize the solvent in-situ, the at least one downhole electric heater being operated in a temperature range that is: (i) above the vaporization temperature of the solvent; and (ii) below the steam saturation temperature of the reservoir; conveying a mixture comprising oil and solvent from the subsurface formation to a separation subsystem; and separating, using the separation subsystem, the oil from the solvent.

The invention provides a dual-targeting carrier material, a preparation method thereof and a preparation method of oleanolic acid nanoparticles wrapped by the dual-targeting carrier material, and belongs to the technical field of medicines. The oleanolic acid targeting nanoparticles are prepared by taking a dual-targeting high-molecular copolymer as a carrier material and adopting an emulsification-solvent evaporation method, so that the oleanolic acid can be protected from being quickly degraded, and the in-vivo circulation time of the oleanolic acid can be prolonged. Meanwhile, targeted delivery of oleanolic acid is realized through a targeted group, the concentration of the drug in tumor tissues is improved, and toxic and side effects on normal tissues are reduced. An MTT method is adopted, the inhibition effect of the oleanolic acid nanoparticles on cell growth is researched, and the result shows that the oleanolic acid targeting nanoparticles have a stronger effect of inhibiting tumor cell proliferation compared with an oleanolic acid raw material medicine.

The invention discloses a mesoscale phase separation tough gel material, and belongs to the technical field of functional polymer materials, the mesoscale phase separation tough gel material comprises an island phase structure with the size of 0.1-5 microns and a continuous sea phase structure; wherein the island phase structure is obtained by crosslinking a copolymer of a hydrophilic monomer and a pyridine organic ligand through metal ions, and the marine phase structure is polyurethane; the mesoscale phase separation gel material based on the sea-island structure has abundant metal coordination and hydrogen-bond interaction, so that the gel has excellent load resistance and energy dissipation resistance and provides higher tensile strength. The invention also discloses a preparation method of the mesoscale phase separation tough gel material, the mesoscale phase separation tough gel material is prepared by adopting physical blending and solvent evaporation, the synthesis operation is simple, and the mesoscale phase separation tough gel material has wide application prospects in the fields of flexible wearable equipment, soft drivers, artificial muscles and the like.

The invention provides a negative pole piece, a preparation method thereof and a battery, the negative pole piece comprises a negative current collector and a negative active material layer, and the negative active material layer comprises a negative active material, a conductive agent and a binder; the negative pole piece meets the following relational expressions: 0.1 < = SV / SL < = 1.0, R / W < = 10%, 0.1% < = R < = 0.5%, 1.0% < = W < = 5.0%; wherein SL is the area of the active particles corresponding to the included angle theta between the orientation of the negative electrode active material and the negative electrode current collector being less than 45 degrees, and Sv is the area of the active particles corresponding to theta being greater than or equal to 45 degrees; r is the range of the distributed mass percentage content of the binder; w0 is the total mass percentage content of the binder; the distribution range R of the binder and the orientation SV / SL of the active particles are controlled through the novel manufacturing process, the phenomenon that the binder is not uniformly distributed in the solvent evaporation process can be reduced, the orientation degree of the active substance particles on the pole piece in the rolling process can be reduced, the battery impedance is reduced, and the battery performance is improved. The electrochemical performance of the battery is improved.

The application discloses a porous aluminum-based carrier and a preparation method thereof, a CO2 adsorbent and application thereof. The preparation of the porous aluminum-based carrier comprises the following steps: segmental aging: a solution containing pseudo-boehmite is subjected to two-stage aging, the first stage is stirring aging, and the second stage is standing aging, the two kinds of aging modes are combined to improve the crystallinity of the pseudo-boehmite; organic solvent washing and pore expansion: the pseudo-boehmite is filtered out, and is subjected to water washing first and then organic solvent washing; segmental drying: low-temperature air blowing drying and vacuum drying are combined, the drying mode, the drying temperature and the solvent evaporation rate during drying are adjusted to avoid pore shrinkage or collapse caused by excessively high drying temperature and excessively fast solvent evaporation speed. The preparation of the porous aluminum-based carrier is simple in operation and low in energy consumption, and the CO2 adsorbent prepared from the porous aluminum-based carrier and an organic amine has excellent adsorption performance such as high adsorption capacity, fast adsorption rate and high stability.

The invention discloses a high molecular weight poly (p-dioxanone) (PPDO) microsphere as well as a preparation method and application thereof. By adopting a double emulsification-solvent evaporation method, an amphiphilic polymer, such as poly (p-dioxanone) (PDO) or a copolymer of PDO and a hydrophilic fragment (such as mPEG and mPPG), is utilized to perform self-assembly on a two-phase interface formed by emulsification under the combined action of amphipathy and polyvinyl alcohol (PVA) to form a double-micelle protective layer, so that the degradation effect of water on PPDO in the microsphere forming process is effectively blocked, and the PPDO can be effectively degraded. And finally, the high-molecular-weight poly (p-dioxanone) microspheres with stable performance are obtained, so that the high-molecular-weight PPDO microspheres have long-term stability. The preparation method is high in operability, mild in condition and suitable for large-scale production, high-molecular-weight poly (p-dioxanone) microspheres are obtained, and the preparation method has wide application prospects in the aspects of tissue filling agents, drug carriers, tissue scaffolds and the like.

The invention discloses an MOF-808-CA-Me mixed matrix gas separation membrane as well as a preparation method and application of the MOF-808-CA-Me mixed matrix gas separation membrane. The preparation method comprises the following steps: preparing MOF-808 (Zr) by utilizing a solvothermal method, reacting with citric acid to graft carboxyl to obtain MOF-808-CA, reacting with melamine to obtain MOF-808-CA-Me, uniformly mixing with a Pebax1657 membrane casting solution, pouring on a base membrane, and obtaining a target membrane material by utilizing a solvent evaporation method. According to the method, an amido bond is formed through a reaction between-COOH of citric acid and-NH2 of melamine, and MOF-808-CA-Me is stabilized in the adsorption and desorption processes of carbon dioxide; the preparation process is simple, convenient and efficient, the cost is low, and the prepared MOF-808-CA-Me mixed matrix gas separation membrane has good selectivity to CO2 / CH4.

The invention relates to the technical field of Chinese medicine concentration, and in particular to a Chinese medicine extraction and concentration device and a concentration method thereof; comprising a tank body, a stirring mechanism and a steam heating mechanism are arranged inside the tank body, the stirring mechanism comprises a rotating shaft, and the rotating shaft is provided with a heating part and a peristaltic suction part for heating the Chinese medicine from the middle of the Chinese medicine. The present invention makes the medicinal liquid evenly heated in the tank body through the synergistic effect of the stirring plate, the heating part and the steam heating mechanism of the stirring mechanism, while the peristaltic suction part circulates and draws the bottom medicinal liquid to the top for discharge, increasing the contact area between the medicinal liquid and the steam, significantly improving the efficiency of Chinese medicine concentration, and making the precipitation part in the medicinal liquid evenly distributed in the medicinal liquid, which helps to make the heat and material transfer more uniform and make the solvent evaporate more efficiently; at the same time, it can ensure the uniform distribution of the effective ingredients in the medicinal liquid, avoiding the loss of ingredients due to precipitation or stratification.

The present invention provides a dry electrode, a preparation method thereof and a semi-solid battery. The dry electrode includes a current collector and a dry film disposed on at least one side of the current collector; the dry film includes the following components by mass fraction: 95% to 98% active material; 0.5% to 1% conductive agent; 1% to 2% inorganic solid electrolyte; 2% to 3% binder; the sum of the mass fractions of the above components is 100%. The dry electrode provided by the present invention does not require a solvent during preparation, can save the coating drying and solvent recovery links, the process flow is simpler, and thus can reduce costs and energy consumption. And there is no drying process during preparation, so there is no gap left after the solvent evaporates, which can effectively improve the compaction density of the electrode sheet, and reduce problems such as cracks and micropores, thereby improving the overall energy density.

The invention discloses a preparation method and application of a targeted delivery system of a metal polyphenol nano system. The invention discloses a targeted delivery system of a metal polyphenol nano system, and a preparation method of the targeted delivery system comprises the following steps: taking the metal polyphenol nano system formed based on epigallocatechin gallate and iron ions as a carrier, and loading fucoxanthin to prepare fucoxanthin nano particles with active oxygen response characteristics; then, after chondroitin sulfate capable of targeting macrophages and (5-carboxyl amyl) triphenyl phosphorus bromide capable of targeting mitochondria are coupled, the fucoxanthin delivery system with the active oxygen response characteristic and the targeting characteristic is further prepared through a double emulsion anti-solvent evaporation method. The system can realize release of fucoxanthin under stimulation of active oxygen, and realizes aggregation of a targeted delivery system in mitochondria of a specific inflammation site. The carrying system can effectively improve or relieve the inflammatory bowel disease, and the raw materials used in the carrying system are low in cost, the preparation conditions are mild, and large-scale production is easy.

The present invention discloses an accordion-shaped lignin cubic carbon material, a preparation thereof, and an application thereof in a supercapacitor. The preparation method comprises the following steps: firstly, dissolving industrial lignin in an alkali solution and purifying in a weak acid solution; then forming, with a block copolymer, a mixed micelle of the lignin / the block copolymer in a mixed solvent of alcohol and water, then sequentially adding a soluble zinc salt and a soluble oxalate, and carrying out solvent evaporating induction under a neutral condition to co-deposit the mixed micelle and zinc oxalate, with an evaporation rate at the same time, to deposit the mixed micelle of lignin / block copolymer between zinc oxalate layers, to construct a cubic lignin / block copolymer / zinc oxalate complex with ordered structure; and after finally carbonizing, obtaining an accordion-shaped lignin cubic carbon material. This material has a rich ion migration space and is internally provided with interconnected supporting nanosheet layers so that the problem that carbon nanosheets are easy to accumulate is solved, the effective surface utilization rate is improved, and performances of the mass, the area-specific capacitance and the rate capability of a supercapacitor are remarkably improved.

The utility model provides a device suitable for preparing lithium sulfide by a continuous double decomposition method. The device mainly comprises a material stirring reaction kettle, a solvent storage tank, continuous solid-liquid separation equipment, continuous solvent evaporation equipment, a first condensing tower and continuous dynamic vacuum calcination equipment, the device disclosed by the utility model can smoothly realize continuous production and preparation of lithium sulfide, and is simple in operation process and free from harmful gas pollution; in the preparation process, a single solvent is used and the solvent is recycled, so that the preparation method has the advantages of energy conservation and low cost, and cross contamination of multiple solvents is avoided; in addition, during continuous production of lithium sulfide, only one-time high-temperature calcination operation is carried out, and a lithium sulfide product with high purity and small particle size is successfully prepared; the composite cathode material can be directly used for preparing a sulfide solid electrolyte and a lithium-sulfur battery. The method has high industrial application value.

The invention relates to a high-efficiency heat dissipation circuit board and a manufacturing method thereof, and the manufacturing method comprises the steps: constructing a raw material performance database through the structural collection and evaluation of the physical parameters of a high-thermal-conductivity nanofiller and a resin matrix, and guiding the nanofiller to adaptively migrate and locate along the gradient through the adjustment of the partition solvent evaporation rate and the interfacial tension gradient. And an efficient heat-conducting filler network with orderly partitions is formed. Furthermore, in-situ multi-mode detection and automatic feedback optimization are combined, the dispersion uniformity of the filler and the continuity of a heat conduction channel are guaranteed, and the circuit board with uniform heat dissipation performance is prepared through a medium-low temperature step-by-step curing latch structure.

The invention discloses a production method of a sintered neodymium-iron-boron spliced magnet. The method comprises the following steps: processing a magnet to a predetermined size, cleaning and drying; dissolving solid epoxy resin, a solid latent curing agent and an accelerant by using an organic solvent to prepare an impregnating adhesive; gluing the two sides of the glass fiber cloth, and fully volatilizing a solvent to obtain pre-impregnated glass fiber cloth; after being cut, the magnetic blocks are inserted between the to-be-spliced magnets; and after being clamped by a clamp, the insulating adhesive layer is heated and cured to form a compact and pore-free insulating adhesive layer. According to the invention, air holes of the adhesive layer are thoroughly eliminated through a prepreg process, the formed insulating adhesive layer has excellent dielectric strength and insulativity, adjacent magnets can be effectively isolated, an eddy current channel can be effectively cut off, the eddy current heating problem in high-frequency application is remarkably reduced, and meanwhile, high strength and high reliability of the spliced magnet are ensured. The method is particularly suitable for the fields of motors and the like needing to reduce eddy-current loss.

The preparation method comprises the following steps: taking para aminobenzoic acid, 3, 3-diaminobiphenyl and phosphorus pentoxide as raw materials, and carrying out high-temperature dehydration cyclization reaction in a polyphosphoric acid solvent to obtain a diamine monomer containing biimidazole; the preparation method comprises the following steps: adding a bis-imidazole-containing diamine monomer, 2-(4-aminophenyl)-5-aminobenzoxazole and an organic solvent into a reactor, stirring and dissolving, after the solution is clarified, adding pyromellitic dianhydride, stirring and reacting, and after the reaction is completed, obtaining a polyamide acid membrane casting solution; and carrying out film casting on the polyamide acid film casting solution, drying at low temperature, and transferring to a muffle furnace to carry out imidization reaction after solvent volatilization is finished, so as to obtain the bis-imidazole polyimide film. The biimidazole polyimide film constructed by the invention is applied to a flexible OLED substrate, and has relatively good thermal performance and mechanical performance.

The invention relates to the technical field of drug-loaded microparticles, in particular to a preparation method and application of medical stone / PLGA composite drug-loaded microparticles, medical stone and PLGA are prepared into a structure with activated nano medical stone as a core and a PLGA polymer as a shell through the processes of ball milling, acid activation, emulsification, solvent volatilization and the like, and the medical stone and the PLGA are synergistically matched, so that the drug-loaded microparticles have the advantages that the drug-loaded microparticles are uniform in particle size distribution, and the drug-loaded microparticles have good drug-loaded performance. Firstly, the hydrogel has intelligent responsiveness, can accelerate degradation in alkaline and enzyme environments of wound surfaces, and realizes accurate release of drugs as required; secondly, the long-acting controlled release property is shown, and a dual sustained release barrier is constructed through medical stone adsorption and PLGA wrapping, so that the medicine is released for more than 72 hours at a constant speed following zero-order dynamics, and burst release is effectively avoided. And thirdly, when the drug-loaded particles are used for hydrogel, the drug-loaded particles in nanoscale are combined with the hydration effect of a hydrogel matrix, so that the efficient permeability of the drug in the cuticle is greatly improved.

The invention relates to the technical field of material analysis, in particular to a rare earth element online detection device and method based on laser-induced breakdown spectroscopy. According to the invention, the laminar flow lining plate is arranged, and the to-be-detected liquid is conveyed to the laminar flow lining plate through the liquid conveying device, so that the laminar flow of the to-be-detected liquid is formed on the laminar flow lining plate. Then, an LIBS signal of the to-be-detected liquid laminar flow is collected through an LIBS signal collection device, and the to-be-detected liquid laminar flow can reduce laser energy consumed by solvent evaporation, so that the signal intensity is improved; and the to-be-detected liquid laminar flow can also reduce the fluctuation of the liquid level, so that the signal stability is improved. In addition, the acoustic signal of the liquid laminar flow to be detected is acquired through the acoustic signal acquisition device, and the LIBS signal and the acoustic signal are jointly analyzed, so that the accuracy of rare earth element detection can be improved.

The invention discloses a polymer-doped blue organic long-afterglow material as well as a preparation method and application thereof, and relates to the field of organic long-afterglow materials, and the polymer-doped blue organic long-afterglow material is prepared from a polymer, a host material and a guest material through solvent evaporation; the polymer is polymethyl methacrylate; the main body material is an electron-rich material diphenylamine derivative; the object material is an electron-rich carbazole derivative, the prepared material belongs to an organic afterglow material and can meet the application requirements in the fields of information encryption, high-end anti-counterfeiting and the like, research on the polymer-doped blue organic long-afterglow material provides a new thought for design and synthesis of a novel blue light-emitting long-afterglow material, and the application prospect of the polymer-doped blue organic long-afterglow material is wide. And a theoretical basis and a material basis can be provided for practical applications such as data encryption and afterglow anti-counterfeiting.

The invention relates to SiBCN aerogel as well as a normal-pressure drying preparation method and application thereof, and belongs to the technical field of functional ceramic aerogel. In order to solve the problems of high equipment requirement, high cost and large energy consumption of the existing SiBCN aerogel preparation method, the invention provides a normal-pressure drying preparation method of SiBCN aerogel, which comprises the steps of precursor solution preparation, hydrothermal crosslinking reaction, solvent replacement, normal-pressure drying and high-temperature ceramization heat treatment. Through step-by-step solvent replacement and normal-temperature and normal-pressure drying treatment, the destructive effect of capillary force on a gel skeleton in the solvent evaporation process is effectively weakened, and the integrity of the gel skeleton can be guaranteed. The method can be implemented only under common room-temperature and normal-pressure conditions, and the preparation process is simple, convenient, efficient and easy to accurately control. The preparation method disclosed by the invention is low in energy consumption and low in preparation cost, meets actual production requirements, is suitable for large-scale production, and provides a technical basis for popularization and application of the SiBCN aerogel.

The invention relates to a preparation method of a biological membrane with a bionic cuticle'brick-slurry 'structure and a wound dressing application of the biological membrane, and belongs to the technical field of biological auxiliary materials. The preparation method comprises the following steps: dispersing prepared wool keratin microspheres in a fibroin solution, realizing a stable and firm brick-slurry structure by combining solvent volatilization with a photo-crosslinking technology, further crosslinking by utilizing metal ion coordination, and simultaneously endowing the dressing with the capabilities of effectively blocking bacterial permeation and sterilizing. The biological membrane exceeds the design of traditional layered wound dressings, and accurate reproduction of a natural skin structure is preferentially considered. The microspheres are assembled into a densely-arranged masonry structure material in a planned manner, so that the dressing has high moisture permeability, oxygen permeability and strong antibacterial barrier capacity, can promote repair of infectious wounds and burn and scald wounds, and has remarkable clinical application value.

The invention relates to the technical field of barium titanate production and preparation, in particular to a barium titanate spherical powder production method. The preparation method comprises the following steps: preparing and atomizing a precursor solution, then spraying the atomized precursor solution into a high-temperature reaction furnace for flame melt crystallization, and then carrying out gradient cooling and spherical curing in a cooling area of the high-temperature reaction furnace, and finally, grading and collecting the prepared spherical barium titanate powder through a collecting system to obtain spherical barium titanate powder with uniform particle size, and carrying out surface functionalization treatment on the collected spherical barium titanate powder through a coating unit to obtain surface-coated spherical barium titanate powder. The precursor solution is subjected to solvent evaporation, thermal decomposition and flame melting in a high-temperature reaction furnace to form barium titanate crystal nucleuses, the crystal nucleuses naturally shrink to form balls under the driving of surface tension, the defect of mechanical damage of a traditional solid phase method or the defect of agglomeration of a liquid phase method is overcome, the crystal defects of the crystal nucleuses are reduced, and meanwhile particle size distribution is more uniform.

The invention discloses a preparation method and application of a perovskite layer of a perovskite solar cell, and relates to the technical field of perovskite cells. The preparation method comprises the following steps: dissolving a perovskite material in an organic solvent to prepare a precursor solution; and performing slit coating on a substrate by using the precursor solution, and obtaining the perovskite layer after annealing, wherein the annealing atmosphere comprises organic salt steam and nitrogen. According to the preparation method disclosed by the invention, the defects of uneven film thickness, disordered solvent volatilization and many film surface cracks when the perovskite layer is prepared by slit coating are overcome through a special annealing process, the problem that the slit coating technology and the annealing process are incompatible in the traditional technology is solved, large-scale preparation of high-quality and low-defect film layers is realized, and the preparation method is suitable for industrial production. The method is suitable for large-scale production of efficient and stable perovskite solar cells.

The invention belongs to the technical field of biomedical materials, and particularly relates to a hydrogel dressing based on traditional Chinese medicine polysaccharide and a preparation method of the hydrogel dressing. The hydrogel dressing based on the traditional Chinese medicine polysaccharide is prepared from the following raw materials in parts by weight: 10 to 15 parts of gastrodia elata polysaccharide, 8 to 12 parts of rhizoma bletillae polysaccharide, 5 to 8 parts of astragalus polysaccharide, 1 to 3 parts of a nano-silver-baicalin compound, 2 to 3 parts of methacrylic anhydride, 0.02 to 0.05 part of VEGF, 0.4 to 1 part of PLGA, 0.1 to 0.3 part of Irgacure 2959, 20 to 30 parts of a 5% calcium chloride solution, 0.1 part of polyvinyl alcohol and 100 to 170 parts of PBS. A triple gel network structure is constructed through photocuring, ionic crosslinking and an emulsification-solvent evaporation method, so that the function integration of controlled release, antibiosis and vascular regeneration promotion is realized, and the clinical treatment requirements of complex wounds are effectively met.

The invention discloses a high-compactness silicon nitride bearing ball and a preparation method thereof, and belongs to the technical field of ceramic products. The high-alpha-phase Si3N4 powder is a main material of the silicon nitride bearing ball, the ALN is used for further improving the wear resistance of the material, the Y2O3 is used for improving the compactness of the silicon nitride bearing ball, pores can be seen under the action of a 0.5 mu m electron microscope after the Y2O3 is added, the MgO is used for promoting the alpha-phase Si3N4 powder to be converted into a beta phase, and the Li2O and the La2O3 form a high-temperature liquid phase to promote the densification of the bearing ball. According to the preparation method, by means of the solubility of the organic solvent to silicon nitride, part of silicon nitride is dissolved in the solution, the surface layer of the silicon nitride powder is further softened, and tiny bubbles in the silicon nitride powder are removed in a negative pressure pumping mode; the silicon nitride is separated out on the surface of the silicon nitride powder in a solvent evaporation manner, so that the shape of the silicon nitride powder is further improved and adjusted, and finally, the bearing ball with higher compactness is obtained.