23results about How to "Slow crystallization rate" patented technology

The invention provides a method and system for purifying metal gallium, the purity of the metal gallium is smaller than or equal to 4N, the method comprises the steps that part of the metal gallium is subjected to first electrolysis through electrolyte, and purified electrolyte with the set gallate ion content is obtained; the purified electrolyte containing the set gallate ion content is used for conducting second electrolysis on the remaining metal gallium, and electrolytic gallium is obtained; and carrying out gradient crystallization on the electrolytic gallium to remove impurity metals in the electrolytic gallium so as to obtain the high-purity metal gallium. According to the method, gallium metal is purified to the purity of 7N or above.

The present application relates to the technical field of polyester material modification, and particularly relates to a high-transparency polyethylene naphthalate material, a preparation method and application, aiming at the problems of fast crystallization rate of the PEN material in the process of processing and molding, easy crystallization of thick products, light transmittance reduction caused by the crystallization, and insufficient material toughness, the present application introduces a diol monomer containing a side group and a flexible chain segment diol monomer into the PEN melt polycondensation process for copolymerization, wherein the diol containing a side group introduces a steric hindrance structure in the molecular chain to destroy the regular packing of the PEN molecular chain, thereby inhibiting the material crystallization behavior and improving the light transmittance of the thick product; the flexible diol introduces a flexible chain segment in the molecular chain to increase the free volume of the molecular chain and improve the molecular chain movement ability, thereby improving the material toughness. Through the above-mentioned synergistic copolymerization modification method, the crystallization tendency of the PEN material can be effectively reduced, the obtained PEN thick product has excellent light transmittance and toughness at the same time, and is suitable for the preparation of high-performance transparent polyester products.

The invention discloses a method for synthesizing a hierarchical pore MFI molecular sieve membrane based on a sacrificial crystal seed layer, and belongs to the field of zeolite molecular sieve membrane synthesis. The hierarchical pore MFI molecular sieve membrane with a compact selective top layer and a macroporous transition layer with high porosity is successfully constructed on a porous carrier through a surface wet gel secondary growth technology of a sacrificial crystal seed layer. The film layer structure and the gas separation performance are optimized by regulating and controlling the composition, the aging time and the crystallization time of the synthetic gel. The prepared hierarchical pore MFI molecular sieve membrane shows high permeability and excellent selectivity in n-butane / iso-butane separation, and the preparation process is good in repeatability, high in stability and suitable for industrial gas separation application.

The application provides a preparation method of a sodium-rich and low-water-content Prussian blue positive electrode material, which comprises the following steps: dissolving sodium ferrocyanide or a hydrate thereof and a complexing agent in deoxygenated water under an inert gas atmosphere and at a certain temperature to obtain a mixed solution A; dissolving a transition metal salt or a hydrate thereof, a sodium supplementing agent, a complexing agent and an auxiliary complexing agent in deoxygenated water under an inert gas atmosphere and at a certain temperature to obtain a mixed solution B; continuously stirring solution A and solution B by dropwise adding them into a container with a positive pressure inert gas atmosphere and at a certain temperature, continuing to stir for a period of time after the dropwise adding is completed, and then standing, centrifuging and vacuum drying to obtain the Prussian blue positive electrode material. The Prussian blue positive electrode material comprises a mixed phase structure of rhombic phases and cubic phases, has the characteristics of high sodium content and low water content. The battery assembled by using the positive electrode material obtained by the method has a theoretical specific capacity close to the theoretical specific capacity under a small current density and still has a high specific capacity under a large current density.

This invention provides a wide-bandgap perovskite thin film, a perovskite tandem solar cell, and a method for preparing the same, relating to the field of photovoltaic technology. The method for preparing the perovskite thin film includes: adding a perovskite structural material and an organic additive to an organic solvent to obtain a perovskite precursor solution; spin-coating the perovskite precursor solution onto a substrate; and annealing the substrate to obtain the perovskite thin film. The organic additive includes a material containing a thiophene dioxide framework. The organic additive used in this invention can effectively regulate the crystallization rate of mixed halides, delay crystallization, enhance the uniform distribution of the mixed halide phase, reduce the defect density in the wide-bandgap perovskite thin film, and significantly improve the power conversion efficiency and stability of the solar cell, thereby obtaining a high-performance tandem solar cell.

This invention belongs to the field of optoelectronic technology, specifically relating to a method for fabricating a controllable crystallization micron-scale perovskite light-emitting device based on solution pretreatment. The method includes the following steps: Step 1: Obtaining a patterned microporous substrate; Step 2: Pre-wetting and seed layer construction; Step 3: Deposition of the main perovskite layer; Step 4: Slow-release controllable crystallization; The spin-coated wet film is placed in a vapor atmosphere of a good solvent for treatment, followed by thermal annealing to form a perovskite thin film within the patterned micropores; Step 5: Fabrication of a controllable crystallization micron-scale perovskite light-emitting device based on solution pretreatment. This invention, using pre-wetting, seed guidance, slow-release crystallization, and vapor annealing on a patterned microporous substrate, achieves precise control over the entire process of film nucleation and growth kinetics within the confined space of the micropores, thereby achieving high-quality, uniform fabrication of perovskite thin films within micron-scale micropores, and ultimately obtaining a high-performance, highly uniform microarray perovskite light-emitting device.

The invention belongs to the photovoltaic field, and particularly relates to a perovskite precursor solution, a perovskite thin film, a perovskite solar cell and a preparation method. A solvent of the perovskite precursor solution comprises N, N-dimethylformamide and tetramethylurea in a volume ratio of (3-20): 1. The solvent of the perovskite precursor solution is cheap and pollution-free, and the perovskite precursor solution can be used for improving the film forming quality of a perovskite film and improving the open-circuit voltage and the energy conversion efficiency of a perovskite solar cell.

The application discloses a sodium ion battery positive electrode material and a preparation method thereof. By adding cheap, non-toxic, environment-friendly and easily-degradable water-soluble cellulose as an additive, the growth of a specific crystal direction can be inhibited. The hydrophilic group of the water-soluble cellulose can change the coordination environment of metal ions and reduce the entry of water molecules into the crystal lattice. In addition, by introducing the water-soluble cellulose, high-concentration reactant feeding can be realized, which is beneficial to reducing the consumption of industrial water. Meanwhile, compared with other existing additives, the water-soluble cellulose is environment-friendly, easily-degradable, low in production and separation cost, and free of toxic by-product generation. The prepared open three-face cubic Fe-based Prussian blue analogue material is good in dispersity, high in purity and uniform in morphology, and as a sodium ion battery positive electrode material, has a reversible capacity of 155.40 mAhg ‑1 at 0.1C (1C=170 mAhg ‑1 ) and a first discharge coulombic efficiency of 97.83%.

This invention discloses a method for preparing a multifunctional molecularly regulated wide-bandgap perovskite solar cell. This method introduces the inexpensive multifunctional molecule L-glutamate hydrochloride (GluHCl) into the wide-bandgap perovskite bulk phase. Utilizing the chemical coordination between GluHCl and PbI2, the crystallization process of the perovskite is effectively regulated, thereby improving the crystallinity quality of the perovskite thin film. Furthermore, GluHCl, on the one hand, through its –NH3... + Terminal passivation of negatively charged deep-level defects (such as I-Pb inversion defects) reduces voltage drop; on the other hand, through –COO ‑ The group coordinates with halogen vacancy defects, suppressing photoinduced phase separation. Based on these advantages, wide-bandgap perovskite solar cells with bandgap values ​​of 1.66 eV, 1.78 eV, and 1.83 eV were fabricated using GluHCl, achieving power conversion efficiencies of 23.36%, 19.46%, and 18.69%, respectively. This method exhibits good process repeatability and bandgap universality, providing a simple and effective strategy for the fabrication of efficient and stable wide-bandgap perovskite solar cells.

The invention provides a Fe-Si-Al magnetic powder core and a preparation method and application thereof. The preparation method comprises the following steps: (1) pre-annealing gas-atomized Fe-Si-Al soft magnetic alloy powder; (2) boric acid, metal salt and a solvent are mixed to obtain coating liquid, the pre-annealed magnetically soft alloy powder is added, and coating magnetically soft alloy powder is obtained through stirring; (3) mixing the nano dielectric ceramic powder, attapulgite and a solvent to prepare a suspension, heating and stirring to obtain an inorganic gelatinized insulating coating liquid, and mixing and stirring the coated magnetically soft alloy powder and the inorganic gelatinized insulating coating liquid to obtain double-layer coated magnetically soft alloy powder; (4) mixing and pressing the double-layer coated soft magnetic alloy powder and zinc stearate, and performing high-temperature annealing treatment to obtain the Fe-Si-Al magnetic powder core. The Fe-Si-Al magnetic powder prepared by the preparation method is uniform in insulating layer, high in strength after heat treatment, good in comprehensive performance and relatively low in cost.

Provided is a copolyester containing: a diacid / diester component having from 70 mol% to 99 mol% of terephthalic acid units and from 1 mol% to 30 mol% of non-terephthalic acid-based diacid / diester units, based on the total diacid / diester component; and a diol component having from 1 mol% to 15 mol% of a cyclohexylidene group-containing diol and from 82 mol% to 99 mol% of ethylene glycol, and from 0 mol% to 3 mol% of diethylene glycol (DEG), based on the total diol component; articles made from the copolyesters and methods of making the copolyesters.

The invention belongs to the field of composite materials, and discloses a wood-plastic board based on hydrophobically modified wood powder, comprising polypropylene, polystyrene, SBS elastomer, and wood powder; the wood powder is hydrophobically modified wood powder; the preparation method of the wood powder is as follows: untreated wood powder, maleic anhydride, and water are mixed for primary grafting; the wood powder after the primary grafting is secondary grafted with a fluorine-containing unsaturated monomer to obtain hydrophobically modified wood powder; the mass ratio of the polypropylene, polystyrene, SBS elastomer, and hydrophobically modified wood powder is 60-80:5-10:1-3:25. The wood-plastic board improves the compatibility of the wood powder and the polymer by hydrophobically modifying the wood powder, improves the mechanical properties of the board, and can also increase Tp and Tf, thereby improving the high temperature resistance of the wood-plastic board. At the same time, the invention also provides a preparation method of the wood-plastic board.

This invention discloses an all-inorganic silicon-based perovskite tandem solar cell and its fabrication method. The fabrication method includes: providing a heterojunction crystalline silicon substrate with a micro-pyramid structure for the light-absorbing surface; fabricating a hole transport layer on the light-absorbing surface of the heterojunction crystalline silicon substrate; coating the hole transport layer with a perovskite precursor solution, wherein the solute in the perovskite precursor solution includes an inorganic salt and an organic ammonium salt, which is used to form an all-inorganic perovskite light-absorbing layer by annealing; the solvent includes a main solvent and a coordination solvent; and sequentially fabricating an electron transport layer and an electrode on the all-inorganic perovskite light-absorbing layer. This invention, through a one-step solution method, introduces organic ammonium salts and coordination solvents into the all-inorganic perovskite precursor solution, significantly delaying the crystallization kinetics of CsPbI3. The resulting film has a uniform and dense morphology, achieving complete coverage of the rough textured heterojunction substrate, thereby fabricating a high-efficiency all-inorganic silicon-based perovskite tandem solar cell.

The invention discloses a method for delaying aging of triticale steamed buns and a compound modifier, and belongs to the technical field of food processing. The compound modifier is prepared from the following components in percentage by mass: 40 to 60 percent of sodium alginate, 20 to 30 percent of cyclodextrin, 10 to 15 percent of monoglyceride and 10 to 15 percent of guar gum. The invention also relates to triticale steamed buns containing the compound modifier. The triticale steamed buns are prepared by adding the compound emulsifier into raw materials of the triticale steamed buns. The compound modifier is simple and convenient to use, and can effectively delay the aging phenomenon of the triticale steamed buns, increase elasticity, improve the structure and texture of the triticale steamed buns, improve sensory acceptability and prolong the shelf life of the triticale steamed buns. The method is suitable for solving the aging problem of the triticale steamed buns in food processing, and efficient production of triticale products and flour products is promoted.

The present invention relates to the technical field of C08L polymer materials, and more specifically, the present invention provides a thermoplastic polyurethane elastomer for film and a preparation method thereof. The present invention provides a thermoplastic polyurethane elastomer for film, and the preparation raw materials include polyester polyol, polyol compound, isocyanate, antioxidant, carbodiimide, ultraviolet absorber, etc. Compared with the prior art, the thermoplastic polyurethane elastomer for film prepared by the present invention has excellent mechanical properties, and also has a medium to low crystallization speed and reduced water vapor permeability. The prepared thermoplastic polyurethane elastomer can be processed not only by film blowing but also by casting in the process of being used in the film field, which provides a new strategy for the preparation of low moisture permeability polyurethane elastomer and expands the application range of thermoplastic polyurethane elastomer.

The invention relates to the field of formula processing of high polymer materials, in particular to a fatigue-resistant low-temperature-resistant elastic material and a preparation method thereof, and the elastic material comprises the following components: 80-95 parts of chloroprene rubber with ultralow crystallization rate; 5-20 parts of eucommia ulmoides rubber; 3-5 parts of zinc oxide; 3-5 parts of magnesium oxide; 1-2 parts of stearic acid; 10 to 30 parts of carbon black; 5-25 parts of white carbon black; 10 to 25 parts of a compound plasticizer; 5 to 15 parts of uniform resin; 1.5 to 3 parts of a compound accelerant; 2-5 parts of an anti-aging agent; 0.5-1 part of a vulcanizing agent; according to the invention, the chloroprene rubber with ultralow crystallization rate and the self-made eucommia ulmoides rubber are combined for use, a plurality of components such as the compound plasticizer are combined to form a synergistic effect, and a specific charging sequence is adopted in the preparation process, so that the fatigue resistance and low temperature resistance of the elastic material can be improved at the same time, and the service life of the rubber air bag is prolonged.

The present invention provides a monomer self-polymerization-assisted synthesis perovskite solar cell and a preparation method thereof, specifically, adding an easily polymerizable monomer to a cesium bromide aqueous solution, then spin-coating it on a lead bromide film loaded with a titanium dioxide mesoporous electronic layer, introducing a monomer self-polymerization-assisted grain growth strategy, synthesizing a perovskite film by a two-step spin coating method, and finally scraping a carbon electrode to assemble into a solar cell. The present invention adopts a two-step method that can accurately control the raw material ratio, uses monomer additive self-polymerization to regulate the perovskite crystallization speed, the electron-donating group of the monomer passivates the metal ion state defects of the perovskite, and the monomer self-polymerization provides space for the growth of grains, eliminates the stress generated during the annealing process of the perovskite film, and obtains a high-purity perovskite film with a large grain size, low defect state density, high energy level matching and low surface roughness, thereby improving the photovoltaic performance of the battery. The present invention has simple preparation steps, high repeatability, green economy, and commercial application prospects.

A high-heat-resistant polyester film and a preparation method thereof. A high-heat-resistant polyester film, the polyester film comprises a B layer and an A layer located on both sides of the B layer, presenting an ABA superposition structure, the B layer comprises 2wt%-10wt% of a nucleating masterbatch and 90wt%-98wt% of pure polyester slices, the A layer comprises 10wt%-40wt% of a crystallization regulating polyester, 50wt%-80wt% of an anti-adhesion masterbatch and 10wt%-40wt% of pure polyester slices, and the crystallinity of the A layer and the crystallinity of the B layer satisfy the following relationship: 30%≤Xc1≤38% and 30%≤Xc2≤38% and ‑5%≤Xc1‑Xc2≤5%, wherein Xc1: the crystallinity of the A layer, wherein Xc2: the crystallinity of the B layer. The high-heat-resistant polyester film prepared by the present invention has high crystallinity between each layer and balanced crystallization performance, which greatly improves the temperature resistance of the polyester film and improves the deformation resistance of the polyester film when it is heated again in downstream processing.

The utility model relates to the technical field of waste oxygen discharge of zinc hydrometallurgy, and discloses a drainage anti-blocking discharge device for waste oxygen of an autoclave, which comprises a waste oxygen pipe communicated between an exhaust pipe on the autoclave and a neutral leaching operation tank in a zinc leaching process, and one end of the waste oxygen pipe close to the exhaust pipe is communicated with a steam-water separator. The first valve is communicated with a waste oxygen pipe, a barometer is installed on the waste oxygen pipe, the waste oxygen pipe is communicated with a flow dredging pipe, the tail end of the flow dredging pipe is communicated with a flow dredging groove, and a second valve is installed on the flow dredging pipe; according to the utility model, the speed of forming sulfur crystals on the inner wall of the waste oxygen pipe by liquid sulfur can be effectively slowed down, the time of interfering the drift diameter of the waste oxygen pipe by the sulfur crystals and the liquid sulfur is prolonged, the increasing speed of pressure in the waste oxygen pipe is slowed down, and the period of normally discharging waste oxygen by the waste oxygen pipe can be effectively prolonged; the dismounting and washing frequency of the waste oxygen pipe is effectively reduced, the washing labor intensity is reduced, and fire and explosion accidents caused by increase of sulfur crystals can be effectively prevented.

The application discloses a kind of wide band gap perovskite light-absorbing layer containing pyridinium iodide, solar cell and preparation method thereof, the light-absorbing layer is by doping 0.1-5 mg / ml concentration trans-4-{4-(dimethylamino) styryl}-1-methylpyridinium iodide in perovskite precursor solution, and then the perovskite light-absorbing layer containing pyridinium iodide is prepared.The preparation method of the application is by introducing trans-4-{4-(dimethylamino) styryl}-1-methylpyridinium iodide additive in perovskite light-absorbing layer bulk phase, slows down the difference problem of bromide and iodide crystallization rate in perovskite film forming process, promotes the uniform distribution of each element, and effectively inhibits the phase separation phenomenon of iodine ion and bromine ion, so as to improve the quality of perovskite film, so that perovskite film has good thermal stability, after heating at 85 DEG C for 1000 hours, the efficiency still remains 90% of initial value.

The utility model relates to the technical field of energy-saving enhanced cement grinding aids, discloses a storage structure for producing an energy-saving enhanced cement grinding aid, and solves the problem that impurities in the grinding aid can accelerate the crystallization speed of the grinding aid when the existing storage structure for producing the energy-saving enhanced cement grinding aid is used for storing. A storage structure for energy-saving enhanced cement grinding aid production comprises a shell, a shell cover is fixedly connected to the upper surface of the shell, a discharging shell is fixedly connected to the lower surface of the shell, a support is fixedly connected to the outer surface of the shell, a discharging pipe is connected to the upper surface of the shell cover in a penetrating mode, and a filter screen is fixedly connected to the inner wall of the shell and located below the discharging pipe. And a vibration mechanism is connected to the upper surface of the shell cover in a penetrating mode and comprises a motor fixedly connected to the upper surface of the shell cover, the output end of the motor is fixedly connected with a rotating shaft, and the effects that the energy-saving enhanced storage structure for cement grinding aid production filters out impurities in a grinding aid and delays the crystallization speed during storage are achieved.

The present invention discloses a perovskite material and a preparation method and application thereof, and specifically relates to the field of optoelectronic functional materials and devices. The preparation method of the perovskite material provided by the present invention adds formamidine chloride and lead chloride as common additives to the perovskite system, and the two additives slow down the crystallization speed of the perovskite material by forming an intermediate phase FAPbCl3, thereby enabling the perovskite crystal to grow fully, improving the crystallinity of the perovskite film and the specificity of the crystal orientation, thereby increasing the average particle size D of the crystal in the perovskite film. 50 , and the roughness of the perovskite film is reduced. Therefore, the perovskite solar cell composed of the perovskite material prepared by the present invention has improved photoelectric conversion efficiency.

This application provides a crystal growth apparatus that can improve the quality of crystal growth. The crystal growth apparatus includes a growth tank and an end cap, the growth tank and the end cap being fixed together to form an inner cavity; the side of the end cap facing the inner cavity is a first fixing surface, and the side of the growth tank facing the end cap is a second fixing surface, the second fixing surface contacting the first fixing surface; the contact portion of the second fixing surface is provided with a groove, the groove including a slot opening, the slot opening facing the end cap.