46results about How to "Don't need protection" patented technology

The invention discloses a method for preparing a large size lead halide cesium perovskite crystal, wherein the crystal structure is CsPbX3, and X = Cl, Br or I. The large size lead halide cesium perovskite crystal is prepared by constant temperature evaporation without a protect gas in the whole process, equipment is simple, and the large size lead halide cesium perovskite crystal can be produced on a large scale. The prepared large-size lead halide cesium perovskite crystal has the advantages of high yield and good stability, and can be used in photoelectric research fields of solar cells, photodetectors, light emitting diodes, and the like.

The invention discloses an efficient perovskite quantum dot anion exchange method. The method comprises the steps that (1) a CsPbBr<3> perovskite quantum dot stock solution is prepared; (2) the CsPbBr<3> perovskite quantum dot stock solution is purified to obtain a fluorescent transparent solution; and (3) halide and deionized water are mixed to prepare a halide aqueous solution, a surfactant is added dropwise to the upper layer of the halide aqueous solution to form an interface layer, then the fluorescent transparent solution obtained after purification in the step (2) is added to form layers, the solution stands under room temperature for a reaction, the upper-layer liquid is taken, and a perovskite quantum solution after anion exchange is obtained.

The invention relates to a fire pre-processing method for a low-grade lateritic nickel ore which belongs to the field of nonferrous metal. The method includes following steps : the low-tenor lateritic nickel ore mine is cracked; vulcanization pre-processing is carried out; a metal sulfide is generated; the ore concentrate and the tailing of the nickel purite can be obtained through carrying out one time roughing, four time choiceness and three time scavenging on the preprocessed lateritic nickel ore and returning the middling ores in sequence; under a magnetic field intensity of 6000 to 10000 oersted, one time open roughing and three time open choiceness are carried out on the flotation tailing; a magnetic product is iron ore concentrate; the rest products are combined into the total tailing. The technology of the invention has the characteristics of high material suitability, short flow, good vulcanization effect, device investment saving, low production cost, and the like, thus leading the subsequence beneficiation techniques to be greatly simplified and being capable of producing the mixed ore concentrate of nickel and cobalt, the iron ore concentrate and the tailing as well as obtaining a higher metal ore concentrate grade and a high recycling rate.

A preparation method of a compound of formula I is characterized in that the compound of formula I is obtained through one step direct condensation ether formation on a raw material of formula II and a raw material of formula III. The protection of reactive hydrogen on the nitrogen atom of the compound of the formula III is not needed in the invention, and a sulfonic acid compound is adopted as a reaction assistant, so the side reaction is reduced, reaction steps are simplified, and a satisfactory product yield can be realized. The compound of formula I having a single optical isomer can be obtained when the raw material of formula II having different isomers is selected.

The invention discloses a method for preparing blue titanium dioxide. The method is characterized in that cheap titanium trichloride is used as a raw material, balance conjugate pair titanium tetrachloride is added in a solvent thermal reaction system according to a certain molar ratio, sodium fluoride is used as a stabilizer, and blue titanium dioxide nanometer particles with high stability are synthesized by a one-step method. The method disclosed by the invention is simple, free of insert gas protection and short in period, the obtained product is good in crystallization growth, high in purity, free of agglomeration, high in yield and uniform in grain size, the product is granular, and the size of the product is 15-25 nanometers.

The invention relates to a preparation method of composite super absorbent resin. The method comprises the step: with water as a solvent, potassium persulfate as an initiator, and N,N-methylene bisacrylamide as a cross-linking agent, enabling monosaccharide molecules and clay to react with an acrylic acid monomer and an acrylamide monomer to obtain the composite super absorbent resin. According tothe super absorbent resin, the water absorption capability of the resin can be effectively improved and the problem that the rigidity of the resin is poorer after water absorption can be improved.

The present invention discloses a method for preparing diaromatic hydrocarbon from aromatic hydrazine. The method comprises that: under effects of a bivalent palladium catalyst and camphor sulfonic acid, aryl siloxane and aromatic hydrazine are subjected to a coupling reaction, and after completing the reaction, post-treatment is performed to obtain the diaromatic hydrocarbon. According to the preparation method of the present invention, the specific additive camphor sulfonic acid is added to the reaction system, such that the coupling reaction of the aryl siloxane and the aromatic hydrazine is effectively promoted, the reaction conditions are mild, the self-coupling reaction of the aryl siloxane is inhibited, and the reaction yield is improved.

The invention discloses a synthesis method of a polyaryls six-membered ring lactone compound. 2-aryl benzoic acid is used as a raw material, C-O cyclizing is achieved through constant current electrolysis under existence of a supporting electrolyte, and the polyaryls six-membered ring lactone compound is obtained after separating and purifying. According to the synthesis method of the polyaryls six-membered ring lactone compound, the polyaryls six-membered ring lactone compound is synthetized by using an electrochemistry method, has the characteristics that the polyaryls six-membered ring lactone compound is high in atom economy, green and efficient, using of a metal catalyst and an oxidant is avoided, and the technology is simple, and the synthesis method of the polyaryls six-membered ring lactone compound is suitable for industrial production.

The invention discloses a preparation method of symmetric 1,4-disubstituted-1,3-diacetylene. Homocoupling of alkyne is carried out in a solvent in the presence of an alkali with silver as a catalyst to obtain the symmetric 1,4-disubstituted-1,3-diacetylene. The method has the advantages of simple operation, obtaining of corresponding diacetylene compounds at room temperature without air isolation or addition of a phosphine ligand or a precious metal, simple post-treatment, and very good practicality and economic values.

The invention discloses a solution method for preparing high-efficiency CIS and CIGS thin-film solar cell. Water and an alcohol solvent are taken as solvents for preparing a precursor solution; thiourea complexes or thiourea derivative complexes of copper, indium and gallium are synthesized; the synthesized complexes are used as raw materials or a combination of the synthesized copper complexes and metal chloride is used as a raw material and dissolved in water or an alcohol solvent to prepare a precursor solution, and the precursor solution is used for preparing the light absorption layer ofthe CIS and CIGS thin-film solar cell. The solvent used in the method is green, environment-friendly, cheap and easy to obtain, and the production cost can be greatly reduced. Metal ion hydrolysis andmetal oxide formation in the annealing process can be prevented, and meanwhile divalent copper defects in CIS and CIGS can be prevented from being formed. The copper-indium-sulfur and copper-indium-gallium-sulfur precursor films are prepared in an external atmospheric environment, and inert atmosphere protection is not needed.

The invention relates to a sensing head of an omni-directional wind speed sensor. The sensing head is characterized by comprising a sensing head shell (1), a heating element support (2), a heating element (3), a heat conductor (4), a temperature sensor (5), a base and a cable (7); the heating element support (2) and the heating element (3) are arranged in the sensing head shell (1); the heating element (3) is arranged on the heating element support (2); the temperature sensor (5) is arranged on the heat conductor (4); a slot is arranged on the sensing head shell (1); an installation groove is arranged on the end surface of the sensing head shell (1) in the slot; the heat conductor (4) is arranged in the installation groove; the sensing head shell (1) is installed on the base (6); and the axial direction of the sensing head shell (1) and the bottom of the base (6) are provided with installation holes of the cable (7). The sensing head can be used for measuring omni-directional wind speed, improving environment tolerability of the sensor and prolonging the service life of the sensor.

The invention discloses a preparation method of a polypyrrole coated lithium titanium phosphate anode material. The method includes: firstly adding ammonia water or a lithium hydroxide solution dropwise into an aqueous solution of polypyrrole, adjusting the solution pH value to obtain a solution A, mixing and dissolving a lithium source, a titanium source and a phosphorus source in a dispersant, then adding the mixture into the solution A, and conducting high speed stirring and dispersion to obtain a slurry B, performing stirring under a water bath condition to obtain gel, carrying out vacuumdrying and grinding crushing to obtain a precursor, and finally calcining the precursor in air atmosphere to obtain the polypyrrole coated lithium titanium phosphate anode material. According to the preparation method provided by the invention, the raw materials have low price, the prepared material has evenly coated surface, obviously improved conductivity, and good cyclic stability in an aqueouselectrolyte solution. Also because of the high conductivity characteristic of a macromolecular conductive polymer, the coated material has greatly improved conductivity and electrochemical performance. The preparation method is simple and practicable, the production process is green and environment-friendly, and is easy for industrial popularization.

The invention discloses a bifunctional ionic liquid, a preparation method thereof and application of the bifunctional ionic liquid in catalytic synthesis of bisphenol compounds, and belongs to the field of application of ionic liquid catalysts. The bifunctional ionic liquid is composed of heterocyclic quaternary ammonium cations containing sulfonic groups and sulfydryl and organic strong acid anions containing or not containing sulfydryl. The bifunctional ionic liquid has the functions of strong protonic acid and a -SH-containing compound, is used for catalytic synthesis of diphenolic acid, bisphenol A, bisphenol fluorene and the like, and has the characteristics of high reaction rate, high target product yield and good selectivity. The bifunctional ionic liquid is a green catalyst which is stable in performance and can be recycled, and compared with a protonic acid and sulfhydryl compound composite catalyst used in a traditional production process, the production process is simplified, equipment corrosion is reduced, and the production cost is reduced.

The invention relates to a preparation method of a microwave-radiated room-temperature phosphorescent material containing a graphene oxide polymer. The method comprises the following steps: oxidizing graphite through an improved Hummers method to obtain graphene oxide, dissolving acrylamide in water, adding a graphene oxide aqueous solution and ammonium persulfate according to a mass ratio of acrylamide to graphene oxide to ammonium persulfate to water of 100:(0.0001-0.002):(0.5-1.5):(500-2000), uniformly conducting mixing, carrying out a reflux reaction under the action of microwaves for 3-10 minutes, conducting cooling to room temperature, precipitating the obtained product with methanol, carrying out suction filtration, washing a filter cake with methanol, and conducting freeze-drying to obtain the graphene oxide-containing super-long-life polymer room-temperature phosphorescent material. The prepared polymer phosphorescent material is long in phosphorescent life at room temperature, the luminescent afterglow reaches 16s, meanwhile, the preparation method is simple and convenient, and the product is non-toxic, pollution-free, heavy metal-free, halogen-free, good in water solubility and wide in application prospect.

The invention discloses a pyridine-based BODIPY-like passivation material, a preparation method thereof and an application of the material in a perovskite solar cell, and belongs to the field of photoelectric functional materials and devices. According to the invention, 2, 2-dipyridyl is used as a raw material to synthesize a BODIPY-like structure, and the BODIPY-like structure is loaded on the surface of perovskite to serve as a passivation layer of the perovskite solar cell. The synthesis route of the passivation material is simple, the conditions are mild, the solvent does not participate in the reaction, the yield is high, inert gas protection is not needed, and molecules with F as anions can be obtained; the unique structure can passivate inherent defects on the surface of the perovskite, inhibit non-radiative recombination, promote interface charge transmission, improve the light utilization rate and protect the perovskite from being eroded by water and solvents, so that the efficiency (photoelectric conversion efficiency reaches up to 20.7821%) and stability of the perovskite solar cell are improved.