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 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 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 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 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 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 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 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 application belongs to the technical field of perovskite materials, and in particular relates to a preparation method of a zero-dimensional cesium lead bromine inorganic perovskite material, comprising the following steps: dissolving the first lead source in a mixed solution of DMF and DMSO to obtain the first solution; CsBr is dissolved in water to obtain a second solution; after the first solution and the second solution are thermally mixed, cooled and separated to obtain Cs 4 PbBr 6 Inorganic perovskite materials, that is, zero-dimensional cesium lead bromine inorganic perovskite. The preparation method of the zero-dimensional cesium-lead-bromine inorganic perovskite material of the present application can selectively control the phase state of the precipitated inorganic perovskite through the three-solvent system of water-DMSO-DMF, so that the product can be as Cs as possible. 4 PbBr 6 phase precipitation, reducing the CsPbBr in the product 3 , CsPb 2 Br 5 Phase content, get high-purity Cs 4 PbBr 6 Inorganic perovskite materials, the preparation conditions are mild and controllable, and the operation is simple and flexible.

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.