44results about How to "The preparation conditions are mild and controllable" patented technology

The invention belongs to the field of materials, and in particular relates to a method for preparing calcium carbonate microspheres by using fibroin nanospheres as a template. The method comprises the following steps of: preparing 0.1 to 20 mass percent aqueous solution of silk fibroin and hermetically culturing the aqueous solution of silk fibroin for 0.5 to 48 hours at the temperature of between 10 and 90 DEG C; performing self-assembly on the silk fibroin when the electric intensity is 1.0*10<2>-1.0*10<5>V / m to form nanometer gel particles with the diameter of 10 to 2,000nm; performing freeze drying on the nanometer gel particles at the temperature of between 80 below zero and 0 DEG C to obtain solid silk fibroin nanospheres with the diameter of 10 to 2,000nm, wherein the nanometer gel particles or the solid silk fibroin nanospheres are used as the template; and forming a calcium carbonate shell on the surface of the template to prepare the calcium carbonate microspheres. The whole preparation process is performed at normal temperature and normal pressure without adding any toxic chemical reagent; and the calcium carbonate microspheres have controllable size and can fully meet the application requirements of various different fields such as cosmetic, ink, coatings, medicament-carrying materials and the like.

The invention discloses a method for preparing globular porous calcium carbonate granules and belongs to the technical field of a preparation method of nano calcium carbonate granules. The method comprises the following processing steps: respectively preparing arginine solution, calcium source solution and sodium carbonate solution; mixing the arginine solution with the sodium carbonate solution to obtain mixed solution; dropwise adding the mixed solution to the calcium source solution under the condition of vigorous stirring; then, continuing to vigorously stir after the dropwise addition, centrifugally collecting granule sediments after reaction is finished; and washing the granule sediments by deionized water and absolute ethyl alcohol, and then drying, so as to obtain nano calcium carbonate granule powder. The method disclosed by the invention is simple in preparation process, strong in laboratory maneuverability, low in production cost, high in product yield, and suitable for research and application of the laboratory and industrial production; and the prepared globular granules have the advantages of good dispersibility, large specific surface area and the like. Therefore, the prepared globular granules have great application potential in the fields of biomedicine and biological materials, such as controlled-release drug carriers, gene therapy vectors and the like.

The invention relates to the technical field of a secondary battery, specifically preparation methods for a high capacity biomass hard carbon anode material of a sodium ion battery. A method comprisesthe following processing steps of crushing and screening a biomass raw material to obtain precursor powder; adding a dehydrating agent, carrying out uniform mixing to obtain a mixture, and carrying out dehydration curing reaction; mixing a curved biomass precursor with a modifier, carrying out mixing by taking water as a dispersant, and carrying out drying processing to obtain a modified biomassprecursor; and carrying out pre-carbonization processing and carbonization processing in sequence. Compared with the prior art, the method has the advantages that starch is taken as the raw material,through curving processing, the problem that the starch is melted and gelatinized due to a high temperature is effectively avoided, and doping and modification processing is carried out on cured starch granules, so a surface chemical environment and an internal structure of hard carbon are changed, and electrochemical performance of the biomass hard carbon anode material is effectively improved. Through curing reaction processing, hard carbon yield is also remarkably improved.

The invention provides a polymer oil layer protective agent for a drilling fluid and a preparation method. The method is carried out according to the following steps of (1) adding 85-95 parts by volume of styrene, 5-65 parts by volume of butyl acrylate and 5-40 parts by volume of 2-acrylamido-2-methyl propanesulfonic acid to water, mixing uniformly, and then adding 5 parts by volume of an emulsifier to obtain a mixed liquid; (2) passing nitrogen into the mixed liquid obtained by the step (1) for 25-35 min, heating to a temperature of 70 DEG C, adding 0.01-0.2 part by weight of an initiator, and then reacting for 5-7 h by controlling the temperature at 70-80 DEG C to obtain a reaction liquid; (3) cooling the reaction liquid obtained by the step (2) to a room temperature, then adjusting a pH value of the liquid to 9-10 with a sodium hydroxide solution, putting the obtained solution in methanol with stirring, and precipitating to obtain a white precipitate; and (4) drying the white precipitate obtained by the step (3) at a temperature of 95-105 DEG C, and smashing the dried precipitate to obtain a product.

The invention discloses a mixed metal sulfide electrode and a preparation method thereof. The mixed metal sulfide electrode is composed of a central core layer and a peripheral shell layer, and is vertical to a conducting substrate to form a hierarchical array structure. The preparation method comprises the following steps: dissolving compounds containing iron, cobalt or nickel into a mixed water solution containing molybdenum and sulfur respectively, adopting a high-pressure hydrothermal method, and carrying out a one-step reaction on the conducting substrate material to obtain the mixed metal sulfide electrode. The hierarchical structure of the electrode is beneficial for improving the specific surface area of the electrode material and increasing the catalytic activity sites; the array structure is beneficial for improving the electron transfer efficiency of the electrode material and the diffusion of an electrolyte; and the adjustable electronic energy level is beneficial for effective injection of electrons from the electrode to the electrolyte. Through these advantages, the catalytic activity, stability and corresponding device performance of the mixed metal sulfide electrode are higher than those of a corresponding single metal sulfide electrode. The electrode prepared by the method can meet high-efficiency and low-cost energy conversion and the application requirement of storage devices.

The invention relates to a preparation method of cerium-doped NH2-UiO-66 / indium zinc sulfide composite visible-light-induced photocatalysts. The preparation method comprises the following steps: preparing cerium-doped NH2-UiO-66 by adopting a solvothermal method, then carrying out a hydrothermal reaction by using an in-situ growth method to separately obtain a cerium (IV)-doped NH2-UiO-66 / indium zinc sulfide composite visible-light-induced photocatalyst and a cerium (III)-doped NH2-UiO-66 / indium zinc sulfide composite visible-light-induced photocatalyst. The preparation method has the beneficial effects that cost is low, repeatability is high, and the preparation conditions are mild and controllable. The prepared cerium-doped NH2-UiO-66 / indium zinc sulfide composite visible-light-induced photocatalysts are green environment-friendly photocatalysts, and the cerium-doped NH2-UiO-66 is compounded with indium zinc sulfide, so that photocatalytic degradation activity can be effectively improved, and therefore, the preparation method has a certain application prospect in the field of water pollution treatment.

The invention relates to a small-caliber artificial blood vessel with the surface grafted with a heparin coating and a preparation method of the small-caliber artificial blood vessel. A small-caliberblood vessel is adopted as a substrate. The preparation method comprises the following steps: soaking the surface of the substrate in a dopamine solution for reaction, coating the surface of the substrate with multiple layers of polydopamine coatings, performing chemical bond combination grafting with polyethyleneimine, and finally activating heparin by utilizing 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide (EDC) and N-hydroxysuccinimide (NHS) to obtain the heparinized surface through amido bond combination. The invention has the characteristics of small caliber, favorable mechanical properties, hydrophilicity and long-acting anticoagulation; the preparation method is environmentally friendly and efficient in compounding, the prepared heparin coating is uniform, the grafting amount of heparin is higher and can reach 4.9 mu g / cm < 2 >, and good market application prospects are achieved.

The invention discloses a method for quickly preparing polyethylene glycol regulated and controlled nano hydroxyapatite and belongs to the field of preparation of biomedical materials. The method comprises the following process steps: preparing a calcium salt solution and a phosphate solution respectively, and mixing the calcium salt solution and the phosphate solution with equal volumes; adjusting the pH value of a reaction system by using ammonia water while stirring; adding polyethylene glycol, and heating the reaction system; and performing centrifuging and washing after reaction, and collecting granular deposits to obtain nano hydroxyapatite granular powder. The method disclosed by the invention is simple in preparation process, strong in laboratory operability, low in production cost and high in product yield and is suitable for laboratory research application and industrial production; and moreover, the prepared rod-shaped nano hydroxyapatite has good dispersity, does not have toxic reaction to normal cells and cancer cells, and has a huge application potential in the fields of biomedicine and biological materials such as drug controlled-release vectors, gene therapy vectors and the like.

The invention discloses a bagging composite material for fruits and vegetables, a preparation method therefor and application of the bagging composite material. The composite material comprises the following raw materials in parts by mass: 1-5 parts of film forming matter, 50-90 parts of dispersant, 0.1-2 parts of antibacterial plant essential oil-chitosan based micro-nano capsules, 1-10 parts ofplasticizer, 1-10 parts of nano reinforced particles and 0.5-5 parts of binder. According to the bagging composite material for the fruits and vegetables, the preparation method therefor and the application of the bagging composite material, a safe and efficient emulsifier, plant essential oil with broad bacteriostatic spectrum and high antibacterial property, and chitosan and derivatives thereofare employed, and the bagging composite material for the fruits and vegetables is prepared through effectively constructing long-acting sustained-release micro-nano capsules, i.e., a biological antibacterial agent based on an emulsion template method, and compounding the micro-nano capsules with the chitosan and derivatives thereof and a nano reinforced particle film forming solution; and the obtained composite material can be applied to the fruits and vegetables through a convenient spray coating mode, the slow release of the antibacterial plant essential oil can be achieved, the insect-proofing, antibacterial and freshness-preserving effects of the fruits and vegetables can be effectively improved, and thus, the quality of the fruits and vegetables is improved.

The invention provides a new method for controllably preparing supported and non-supported Ni2P under mild conditions. In the method, two tube furnace reactors connected in series are adopted; and sodium hypophosphite aqueous solution is subjected to thermal decomposition in the first reactor to generate phosphine gas, and later, carried by argon, the phosphine gas is dried and then enters into the second reactor to react with nickel salt to generate the required Ni2P. The invention is characterized in that the preparation process is safe and concise; the preparation conditions are mild and controllable; simple thermal treatment under normal pressure is only needed in the preparation process; and the supported and non-supported Ni2P can be controllably prepared by controlling the amount of the sodium hypophosphite. With excellent catalytic performances, such type of phosphides can be widely applied to various hydrogenation reactions.

The invention provides a process for producing calcium carbonate employing a nano-precipitation method, and belongs to the technical field of preparation methods of nano calcium carbonate particles. The process comprises the following processing steps: respectively preparing an arginine liquid, a calcium source liquid and a sodium carbonate liquid; mixing the arginine liquid with the sodium carbonate liquid to obtain a mixed liquid; dropwise adding the mixed liquid to the calcium source liquid under a vigorous stirring condition; further vigorously stirring after dropwise adding is ended; and centrifugally collecting particle sediments after reaction is ended; and washing, and drying the particle sediments with deionized water and absolute ethyl alcohol, so as to obtain nano calcium carbonate particle powder. The method has the advantages of simple preparation process, high laboratory operability, low production cost and high product yield. The process is suitable for laboratory research application and industrial production; and the prepared globular particles have the advantages of good dispersity, relatively large specific surface area and the like, and have great utilization potentiality in the fields of biomedicine and biological materials, such as control-released drug vectors and gene therapy vectors.

The invention relates to a method for preparing a mesoporous silica material by hydroxyethyl cellulose serving as a template. The method particularly includes the steps: 1) adding hydroxyethyl cellulose into water, heating, stirring and dissolving to obtain hydroxyethyl cellulose water solution, slowly adding alkali metal silicate water solution into the hydroxyethyl cellulose water solution to uniformly mixing mixture, sufficiently stirring the mixture until clear and bright solution is acquired, adjusting a pH (potential of hydrogen) of a reaction system to reach 5-6 by acid solution, and standing for 1-24 hours to obtain reaction liquid; 2) centrifuging the reaction liquid, drying and collecting to obtain a solid matter, and calcining the solid matter to obtain the mesoporous silica material. According to the method, a non-ionic surface active agent serves as a hydroxyethyl cellulose template agent to assemble mesoporous silica, unformed mesoporous silica material is synthesized byan unconventional acid hydrolysis process, and the raw materials are rich, renewable and good in biocompatibility, and the method is simple in synthetic process, mild and controllable in preparation condition and simple, efficient and nontoxic in preparation process.

The invention belongs to the technical field of nano-materials and particularly relates to silver nanoparticles and a preparation method thereof. The preparation method comprises steps as follows: silver salt, a reducing agent, a surfactant and a solvent are provided; after the surfactant is dissolved in the solvent, the silver salt is added, and a mixed solution is obtained; the reducing agent isadded to the mixed solution for a redox reaction, and a silver nanoparticle solution is obtained; the silver nanoparticle solution is subjected to centrifugal treatment or / and pressure filtration treatment, and the silver nanoparticles are obtained. According to the preparation method of the silver nanoparticles, the technology is simple, preparation conditions are mild and controllable, the costis low, and batch production can be realized; and the finally-prepared silver nanoparticles have the characteristics of uniform particle size distribution and stable and good conductivity.

The invention belongs to the technical field of perovskite materials, and particularly relates to a preparation method of a zero-dimensional cesium-lead-bromine inorganic perovskite material, which comprises the following steps: dissolving a first lead source in a mixed solution of DMF and DMSO to obtain a first solution; dissolving CsBr in water to obtain a second solution; and carrying out thermal mixing treatment on the first solution and the second solution, cooling and separating to obtain a Cs4PbBr6 inorganic perovskite material, i.e. the zero-dimensional cesium-lead-bromine inorganic perovskite. According to the preparation method of the zero-dimensional cesium-lead-bromine inorganic perovskite material, the phase state of precipitated inorganic perovskite can be selectively regulated and controlled through a three-solvent system of water-DMSO-DMF, and a product is promoted to be precipitated in a Cs4PbBr6 phase as much as possible, the content of CsPbBr3 and CsPb2Br5 phase states in the product is reduced, and the high-purity Cs4PbBr6 inorganic perovskite material is obtained. The preparation method is gentle and controllable in preparation condition and is simple and flexible in operations.

The invention provides an anticoagulant antimicroorganism coating and a preparation method and use thereof. The anticoagulant antimicroorganism coating based on dopamine-assisted codeposition has a structure as follows: a side close to a base material is taken as an inner side, a dopamine coating and an anticoagulant antimicroorganism composite layer are sequentially arranged from inside to outside and the dopamine coating and the anticoagulant antimicroorganism composite layer are coated on a surface of the base material; wherein the dopamine coating takes dopamine or levodopa and polyethyleneimine as raw materials, and the anticoagulation antimicroorganism composite layer takes an anticoagulation material, an antimicroorganism material, EDC(1-(3-dimethylaminopropyl)-3-ethylcarbodiimide) and NHS(N-hydroxysuccinimide) as raw materials; and hydroxyls and quinonyls of the dopamine coating are covalently bound with aminos and carboxyls of the anticoagulant antimicroorganism composite layer to realize chemical compounding of the two layers.

The invention belongs to the technical field of multiferroic films, and concretely relates to a bismuth ferrite / polyvinylidene fluoride-trifluoroethylene multilayer composite film. The multilayer composite film comprises a PVDF-TrFE thin film and at least one layer of BFO / PVDF-TrFE composite film, and the PVDF-TrFE film is attached to the uppermost BFO / PVDF-TrFE composite film. A preparation method of the multilayer composite film comprises the following steps: dissolving PVDF-TrFE powder to obtain a solution A, and adding BFO nanoscale powder into the solution A to obtain a mixed solution B;taking FTO conductive glass as a substrate, spin-coating the FTO conductive glass with the mixed solution B to prepare a BFO / PVDF-TrFE composite film, drying, and spin-coating the BFO / PVDF-TrFE composite film with the solution A to prepare a PVDF-TrFE film; and then annealing the wet film to obtain a cobalt ferrite / polyvinylidene fluoride-trifluoroethylene multilayer composite film, and finally plating a platinum point electrode on the cobalt ferrite / polyvinylidene fluoride-trifluoroethylene multilayer composite film. The bismuth ferrite / polyvinylidene fluoride-trifluoroethylene multilayer composite film disclosed by the invention not only has low leakage current, but also has relatively high remnant polarization intensity, and is low in process equipment cost, simple in process and high in controllability.

The invention relates to a large-area quasi-single crystal perovskite film closed circulation preparation device, which comprises a precursor solution circulation system, an anti-solvent circulation system, an inert gas circulation system, a large-area quasi-single crystal perovskite film closed growth system and a heating system. A first liquid inlet and a first liquid outlet of the precursor solution circulation system, a second liquid inlet and a second liquid outlet of the anti-solvent circulation system, and a gas inlet and a gas outlet of the inert gas circulation system are all communicated with the large-area quasi-single crystal perovskite film closed growth system. The heating system is used for heating the large-area quasi-single crystal perovskite film closed growth system. Thedevice is simple in structure, the preparation conditions are mild and controllable, the preparation method is simple, effective and environmentally friendly, and large-scale continuous cyclic production of various large-area films prepared based on a solution method can be achieved.

A method for synthesis of Sialon ceramic fiber by combination of electrostatic spinning and carbothermal reduction nitridation is as follows: using tetraethoxysilane as a silica source, aluminum nitrate ennea-hydrate or aluminum chloride is used as an aluminum source, sucrose is used as a carbon source, polyvinylpyrrolidone is used as a polymer for preparing a spinning solution; using the spinning solution for electrostatic spinning to prepare a ceramic fiber precursor; using the ceramic fiber precursor for carbothermal reduction nitridation to prepare the Sialon ceramic fiber. According to the method, the Sialon ceramic fiber is prepared by combination of electrostatic spinning and carbothermal reduction nitridation, the Sialon ceramic fiber prepared by the method can be used for compounding toughening ceramic materials and reducing the thermal conductivity, and has great application potential in the fields of aerospace and other high temperature structural materials.

The invention belongs to the technical field of photo-catalysts and composite adsorbing materials and in particular relates to selective composite photo-catalyst powder and a preparation method and application thereof. The chemical formula of the composite photo-catalyst powder is La2NiO4 / Y2Mo4O15. The preparation method comprises the following steps: weighing soluble salts of nickel and soluble salts of lanthanum according to a molar ratio of 1 to 2, dissolving the salts in distilled water, thereby obtaining a solution A; slowly adding a sodium hydroxide solution, stirring, performing suction filtration on the solution, thereby obtaining a precipitate B; calcining and maintaining the temperature in a muffle furnace, thereby obtaining catalyst powder C; adding the powder C into an alcoholic solution, performing ball milling at high speed, thereby obtaining powder D (La2NiO4); weighing a proper amount of soluble salts of yttrium, measuring a certain amount of ammonium molybdate, dissolving in a proper amount of distilled water, thereby obtaining a solution E; and mixing the solution E and the powder D, drying, calcining, thereby obtaining the composite catalyst powder. The composite photo-catalyst powder can be used in degradation treatment of insoluble organic matters in industrial wastewater and particularly has an obvious catalytic degradation effect on methylene blue.

The invention discloses an oriented full-layer soft bone stent containing a calcified layer. Similar to a natural soft bone structure, the oriented full-layer soft bone stent is composed of an oriented upper layer and a calcified bottom layer. The oriented upper layer is composed of silk fibroin and a chondrocyte outer matrix without cells. The calcified bottom layer is formed by compounding any one of three calcium and phosphorus organic salts: silk fibroin, nano-hydroxyapatite, beta-tricalcium phosphate and bioactive glass. By means of a structural bionics design, stability of the soft boneand a bone micro environment is achieved, and a purpose of repairing defect of the soft bone effectively is achieved.

The invention discloses a preparation method of a large-area flexible dye sensitized solar cell based on a titanium foil net, which comprises the steps of: utilizing a titanium net as a substrate, and preparing a platinum-titanium net counter electrode by an electrodeposition method or a vacuum thermal decomposition method; and then, utilizing a flexible titanium foil as the substrate to prepare a dye sensitized titanium dioxide-titanium foil photoanode; finally, assembling the platinum-titanium net counter electrode and the dye sensitized titanium dioxide-titanium foil photoanode to a cell with a sandwich-type structure by flexible plastics and a sealing material, and injecting an electrolyte at the intermediate to obtain the large-area flexible dye sensitized solar cell based on the titanium foil net. The preparation method of the invention has the advantages of capability of preparing the large-area flexible platinum-titanium net counter electrode and the large-area flexible titanium dioxide-titanium foil photoanode satisfying the application demand of the large-area flexible dye sensitized solar cell, moderate and controllable preparation conditions, simple and effective preparation method, low cost and benefit of large scale production.

The invention provides a planting matrix for potted flowers. The planting matrix comprises the following raw materials in percentage by weight of 8-15% of silkworm excrement, 18-25% of expanded vermiculite powder, 0.15-0.25% of modified fullerene, 0.3-0.8% of inorganic salt, 15-20% of vinasse, 0.08-0.15% of mixed bacterial liquid, 12-18% of plant ash, 0.2-1.5% of a pH regulator and the balance ofwater. A water-soluble fullerene nano material has good biocompatibility, good physical and chemical stability and mild and controllable preparation conditions, a good space can be provided for flowergrowth by adopting a fullerene C60-polydopamine-glutathione compound, and meanwhile, due to the special biocompatibility of the fullerene C60-polydopamine-glutathione compound, the effect fermentation of nitrogen-fixing bacteria and cellulose decomposition bacteria in the mixed bacteria liquid can be effectively improved.

The invention discloses a method for preparing a cavity confinement in-situ growth large-area quasi-monocrystalline perovskite thin film. The method comprises the following steps: firstly, constructing a metal cavity electrode with a specific shape and specification on a large-area transparent conductive substrate so as to reduce an internal resistance of a device; then producing a carrier transport layer on the surface; depositing functionalized graphene quantum dots; and finally performing cavity confinement in-situ growth of a perovskite thin film, and promoting uniform and rapid growth ofquasi-monocrystalline perovskite by using a poor solvent standing method to prepare the large-area quasi-monocrystalline perovskite thin film. The quasi-monocrystalline perovskite thin film obtained by the method has advantages of a large area, few grain boundaries, few defects, a controllable thickness and the low internal resistance, and can be directly applied to photovoltaic devices.

The invention provides sulfobutyl-alpha-cyclodextrin and a preparation method thereof. The structural formula of the sulfobutyl-alpha-cyclodextrin is shown in the specification, wherein R=H, and the molecular weight is 1,108.17-2,605; and the sulfobutyl-alpha-cyclodextrin is prepared by the reaction of 1,4-butanesultone and alpha-cyclodextrin in a strong alkali solution. The water solubility of the sulfobutyl-alpha-cyclodextrin provided by the invention reaches 80g at 20 DEG C and is improved by 4 times over the existing alpha-cyclodextrin. The preparation method of the sulfobutyl-alpha-cyclodextrin provided by the invention is simple and has high reaction efficiency; the prepared sulfobutyl-alpha-cyclodextrin has strong stability and good water solubility; the whole preparation method has strong operability; and the sulfobutyl-alpha-cyclodextrin can be conveniently prepared into various guest molecule inclusion compounds and compositions.

The invention discloses a method for preparing globular porous calcium carbonate granules and belongs to the technical field of a preparation method of nano calcium carbonate granules. The method comprises the following processing steps: respectively preparing arginine solution, calcium source solution and sodium carbonate solution; mixing the arginine solution with the sodium carbonate solution to obtain mixed solution; dropwise adding the mixed solution to the calcium source solution under the condition of vigorous stirring; then, continuing to vigorously stir after the dropwise addition, centrifugally collecting granule sediments after reaction is finished; and washing the granule sediments by deionized water and absolute ethyl alcohol, and then drying, so as to obtain nano calcium carbonate granule powder. The method disclosed by the invention is simple in preparation process, strong in laboratory maneuverability, low in production cost, high in product yield, and suitable for research and application of the laboratory and industrial production; and the prepared globular granules have the advantages of good dispersibility, large specific surface area and the like. Therefore, the prepared globular granules have great application potential in the fields of biomedicine and biological materials, such as controlled-release drug carriers, gene therapy vectors and the like.

The invention belongs to the field of materials, and in particular relates to a method for preparing calcium carbonate microspheres by using fibroin nanospheres as a template. The method comprises the following steps of: preparing 0.1 to 20 mass percent aqueous solution of silk fibroin and hermetically culturing the aqueous solution of silk fibroin for 0.5 to 48 hours at the temperature of between 10 and 90 DEG C; performing self-assembly on the silk fibroin when the electric intensity is 1.0*10<2>-1.0*10<5>V / m to form nanometer gel particles with the diameter of 10 to 2,000nm; performing freeze drying on the nanometer gel particles at the temperature of between 80 below zero and 0 DEG C to obtain solid silk fibroin nanospheres with the diameter of 10 to 2,000nm, wherein the nanometer gelparticles or the solid silk fibroin nanospheres are used as the template; and forming a calcium carbonate shell on the surface of the template to prepare the calcium carbonate microspheres. The wholepreparation process is performed at normal temperature and normal pressure without adding any toxic chemical reagent; and the calcium carbonate microspheres have controllable size and can fully meet the application requirements of various different fields such as cosmetic, ink, coatings, medicament-carrying materials and the like.

The invention discloses a preparation method of a large-area flexible dye sensitized solar cell based on a titanium foil net, which comprises the steps of: utilizing a titanium net as a substrate, and preparing a platinum-titanium net counter electrode by an electrodeposition method or a vacuum thermal decomposition method; and then, utilizing a flexible titanium foil as the substrate to prepare a dye sensitized titanium dioxide-titanium foil photoanode; finally, assembling the platinum-titanium net counter electrode and the dye sensitized titanium dioxide-titanium foil photoanode to a cell with a sandwich-type structure by flexible plastics and a sealing material, and injecting an electrolyte at the intermediate to obtain the large-area flexible dye sensitized solar cell based on the titanium foil net. The preparation method of the invention has the advantages of capability of preparing the large-area flexible platinum-titanium net counter electrode and the large-area flexible titanium dioxide-titanium foil photoanode satisfying the application demand of the large-area flexible dye sensitized solar cell, moderate and controllable preparation conditions, simple and effective preparation method, low cost and benefit of large scale production.

The invention discloses an in-situ preparation method of a photoanode of a perovskite solar cell. A lead-containing compound is uniformly dispersed in a titanium dioxide slurry, and a film is formed on a conductive base material by a scraping coating method or a spin coating method, and titanium dioxide is obtained by high-temperature sintering. Composite film with lead oxide; after treatment with hydrohalic acid solution, a composite film of titanium dioxide and lead halide is obtained in situ; a layer of lead halide is spin-coated on its surface; after treatment with organic halide amine solution, organic lead halide calcium titanium is obtained in situ A composite photoanode with good contact between mineral light-absorbing material and titanium dioxide, uniform filling and covering. The photoanode of the invention can meet the application requirements of high-efficiency and low-cost perovskite solar cells, and has the characteristics of mild and controllable preparation conditions, simple and effective preparation method, low cost, and favorable for large-scale production.

The present application relates to the technical field of perovskite materials, and provides a lead-free indium-based double perovskite material and a preparation method and application thereof. Wherein, the preparation method of lead-free indium-based double perovskite material includes the following steps: providing a first solution containing a first halide metal salt and a second solution containing a second halide metal salt, and providing a third solution containing indium halide , and adjust the pH of the third solution to <4.0; mix the first solution, the second solution and the third solution for reaction to obtain a first mixed solution, and separate and purify the first mixed solution to obtain the lead-free indium-based double perovskite material. The preparation method has simple and flexible operation, mild and controllable preparation conditions, zero waste discharge, no pollution, excellent environmental performance, and is suitable for large-scale production of lead-free indium-based double perovskite materials with non-toxic, high stability and high purity. Scale and stable production.