90results about How to "Effective control of particle size" patented technology

The invention relates to a method with low cost and simple preparation process for doping nano-Ag particles in TiO2 nanotubes. The method can realize that nanoparticles can be evenly distributed and the electrocatalysis efficiency of TiO2 nanotubes can be increased. The method comprises the following steps: firstly utilizing a two-electrode system to prepare TiO2 nanotubes, secondly placing the prepared titanium alloy or pure titanium with TiO2 nanotubes in silver nitrate solution to deposit, performing an electrocatalysis experiment in basic ethanol solution to obtain TiO2 nanotubes doped with nano-Ag particles. The current densities of the oxidation peak and reduction peak of the obtained TiO2 nanotubes are separately up to 1mA/cm<2> and 3.2mA/cm<2> and the TiO2 nanotubes has higher electrocatalysis efficiency.

The invention discloses porous V2O5/C composite microspheres of a lithium secondary battery positive electrode material and a preparation method of the porous V2O5/C composite microspheres. The porous V2O5/C composite microspheres are formed by clustering carbon coated V2O5 nano composite particles with the particle sizes of 5-30 mirons, and the porous V2O5/C composite microspheres are internally provided with porous structures. The preparation method comprises the following steps of synthesizing crosslinked polymethyl methacrylate PMMA microgel spheres, hydrolyzing partially so as to act as a mold plate for synthesizing the porous V2O5/C composite microspheres; adsorbing VO<2+> to three-dimensional meshes of the PMMA mold plate, changing the pH value of an adsorption solution, hydrolyzing the VO<2+> to generate V2O5 nano particles, and filling the three-dimensional meshes in situ with the V2O5 nano particles so as to obtain a V2O5/PMMA precursor; and forging the precursor so as to obtain the porous V2O5/C composite microspheres. The composite microsphere has the beneficial effects of improving the multiplying performance and the cycle performance and the like; the preparation method is simple in technology, and is suitable for being used in large-scale industrial production.

The invention discloses a preparation method for a metal-doped lithium/carbon manganese phosphate (LiMXMn1-XPO4/C) composite from manganese phosphate. The method comprises the following steps: preparing active manganese phosphate materials (MnPO4) with different shapes by using a precipitation or sol-gel method; then subjecting prepared manganese phosphate, a lithium source and a metal-doped elemental compound to ball milling for 20 to 50 h and mixing with alcohol used as a dispersant; carrying out vacuum drying and crushing to obtain a crushed substance; placing the crushed substance in a stainless steel container, heating the crushed substance to a temperature of 450 to 800 DEG C in a furnace protected by an inert atmosphere and maintaining the temperature for 2 to 12 h; and rapidly placing the substance to a liquid coolant under the conditions of a high temperature and air isolation and carrying out rapid cooling so as to obtain the LiMXMn1-XPO4/C composite. The method provided by the invention has shortened process flow, can maintain particle activity in a high temperature, effectively gives rise to structural dislocation, improves the ionic migration rate and electronic conductivity of the composite and is suitable for large-scale industrial production.

The invention discloses a method for preparing lithium manganese phosphate lithium/carbon as a lithium ion battery material by using sol-gel, belonging to the technical field of new energy materials. In the preparation method, the lithium source compound, the manganese source compound, the phosphorus source compound and the complexing agent compound are dissolved or dispersed in a solvent in a molar ratio of 1.025:1:1:0-2 to obtain a mixed material. Concentrated nitric acid or Concentrated ammonia water is used to adjust the pH value of the solution to 0.5-3.7 to obtain a sol solution. The sol solution is evaporated to dryness in a water bath to obtain dry gel, which is then dried and calcined to obtain carbon-coated lithium manganese phosphate with a particle size of 50-150 nm. The material synthesized by the method has a nanoscale size and is evenly dispersed, and the lithium manganese phosphate matrix is ​​coated with a carbon material, which effectively prevents the agglomeration of the particles and improves the electronic conductivity of the particles. Electrochemical tests show that the electrode has an obvious discharge platform at about 4V, high discharge capacity, and good cycle stability.

The invention relates to a production method for an inorganic powder material, in particular to a production method for white carbon black with high additive amount applied to high-elastic silicone rubber. The production method comprises the processes of dissolution and refining of water glass, synthesis reaction of the water glass and dilute sulphuric acid, pressure filtration, washing, pulping and drying; the reaction of the water glass and the dilute sulphuric acid comprises the following three steps: generating seed crystal, conducting synthesis reaction and adjusting integral pH value. According to the invention, the synthesis process of three steps is adopted; the specific surface area of the product is reduced by adding a sodium sulfate additive; reaction conditions are controlled strictly; the particle diameter of secondary particles of the product is controlled effectively; the characteristics of small specific surface area, low oil absorption value, high additive amount, high reinforcing performance and short mixing time during mixing with silicone rubber are provided; the raw materials are easy to obtain; the process is easy to control; no extra equipment is needed; the production can be conducted on an original production line.

The present invention belongs to the field of nanometer material producing technology. Modified nanometer and subnanometer class superfine zinc oxide powder is produced with zinc oxide in the ammonia distillation process through adding surface modifier, or superdispersing polymer, or amphoteric structure coupling agent or other modifying solvent, and using the proper modifying process specification and method. The present invention utilizes the space steric effect to control the particles size and obtain the modified superfine zinc oxide with high dispersivity and powerful functions. The modified superfine zinc oxide powder may be used widely in rubber, ceramic, textile and daily-use chemical industries.

The invention relates to microcapsules and a preparation method thereof. Each microcapsule has a structure of taking a polymeric hydrophilic colloid as a capsule core and a biodegradable polymer material as a capsule membrane; a water-soluble medicine is dispersed into the hydrophilic colloid capsule core; the microcapsules are prepared by the combination of multiple technologies such as a microemulsion technology, an ultra-low temperature quick-freezing technology and the like and a freeze-drying process; the particle sizes of the microcapsules can be controlled; the microcapsules are high in medicine loading capacity and medicine entrapment efficiency; and the microcapsules are uniform in particle size, microcapsule particles cannot be gathered, and the medicine release behavior is controllable. The microcapsules are applicable to the entrapment of water-soluble medicines, are particularly applicable to medicines with low thermal stability and macromolecular medicines such as protein, polypeptides, polysaccharides and the like, and can be applied to the injection and oral administration of multiple formulations for local or systemic treatment of mucous membranes, skins, wounds and orifices.

The invention discloses a method for doping magnetic particles in a titanium dioxide nanotube with an easy preparation process, which is implemented according to the following steps: (1) using a two-electrode system to prepare the titanium dioxide nanotube; and (2) carrying out electrochemical deposition on the magnetic particles by a three-electrode system. Compared with the traditional method for preparing the magnetic particles, the method of the invention mainly has the advantages that: (1) the defect of agglomeration of magnetic particles is overcome to cause the magnetic particles to be evenly distributed on the nanotube; (2) the reaction time is greatly shortened, and the operation is simple; (3) the size of the diameter of the magnetic particles can be effectively controlled; and (4) the magnetic particles can be firmly adhered on the substrate of a TiO2 nanotube. The magnetic particles have stable chemical property and stronger magnetic filed response, wherein the saturation magnetization intensity Ms, remanence Mr and coercivity Hc can respectively reach 41.8emu/g, 2.66emu/g and 123Oe.

The invention discloses a method for preparing a macroporous material loaded with silver nanoparticles. The macroporous hydroxyapatite is synthesized by using cuttlefish bone as a template agent and adding a certain amount of phosphate, wherein the molar number of calcium ion and phosphate ion is more than The ratio is 1:1-3, and the macroporous hydroxyapatite is used as a carrier to soak in silver nitrate solution, and finally sintered at high temperature to load silver nanoparticles on it. The present invention realizes the effective control of particle size and dispersibility of silver nanoparticles, and obtains a silver nanoparticle-loaded macroporous material with uniform particle size and good dispersibility. The material has a massive macroporous structure and has a large surface area. It has strong adsorption and carrying capacity. Due to the large specific surface, especially the loading of nano-silver particles, this product has broad application prospects in the fields of catalysts and antibacterial materials. The preparation process of the invention is simple, the cost is low, and the investment in equipment is small. , suitable for mass production.

The invention discloses fully-nutritional liquid fertilizer containing organic carbon. The fully-nutritional liquid fertilizer is prepared from, by mass, 50-60% of a small molecule organic carbon aqueous solution, 10-25% of a nitrogen raw material, 5-9% of a phosphorus raw material, 12-20% of a potassium raw material and 1-8% of medium trace elements, wherein the sum of the contents of all ingredients of the fully-nutritional liquid fertilizer containing organic carbon is 100%. The fully-nutritional liquid fertilizer containing organic carbon is complete in nutrient element and capable of meeting the requirement for nutrition of most crops; besides, small molecule organic carbon is contained, carbon nutrition can be additionally supplemented, organic carbon nutrition and inorganic nutrition conduct cooperative synergism and raise the inorganic nutrition absorption and utilization rate. By means of the fully-nutritional liquid fertilizer containing organic carbon, organic waste can be efficiently utilized, the fully-nutritional liquid fertilizer is produced in a stirring mode at the room temperature, energy consumption is low, and production equipment is simple.

The invention discloses a spirofluorene copper pyridine micro-nano particle and a preparation method thereof. The preparation method of the spirofluorene copper pyridine micro-nano particle comprises the following steps of: adding a certain amount of metal salt solution into organic ligand containing end-ground nitrogen atoms; stirring for 0.5-10 hours at a certain temperature; ageing for 1-10 hours, centrifugally separating, washing and drying to obtain the corresponding metal-ligand micro-nano particle. Moreover, the application of the micro-nano particle in C-C (Carbon-Carbon) coupling reaction is successfully researched. The preparation method disclosed by the invention can be used for preparing different metal-ligand micro-nano particles, and can be used for effectively adjusting the size of the particle diameter and the surface smoothness to obtain sheet metal-ligand micro-nano particles which are uniform in particle diameter, different in surface smoothness and excellent in physical and chemical performances. According to the catalysis experiment, the metal-ligand micro-nano particle which is prepared by the method disclosed by the invention has good catalytic activity when being used as a catalyst, and has a wide application prospect in the catalytic field. In the whole preparation process, the operation is simple, the material cost is low and the device investment is less, therefore, the spirofluorene copper pyridine micro-nano particle is suitable for large-scale production.

The invention belongs to the technical field of material preparation and solar energy photocatalysis and especially provides a carbon nitride hollow sphere photocatalyst, a preparation method and an application thereof. In the invention, a thermal fluid is used as a reaction medium, so that by means of a solvent action of the fluid under a subcritical status, reaction activity of a precursor is increased, and growth of a product is directly controlled at a low temperature to prepare the hollow sphere granules. The method solves the dependency on a template agent in a template-calcination technology in the prior art, which has the problems that high temperature calcination and corrosive removal of the template may cause collapse of the hollow structure and the product is low in light absorption range. The method achieves self-polymerization of a triazine ring monomer into the carbon nitride hollow sphere photocatalyst under a mild condition. By regulating the reaction parameters, polymerization degree is effectively changed, thereby controlling the physical and chemical properties of the product.

The invention provides a low-temperature lithium ion battery anode material and a method for preparing the same, and belongs to the field of lithium ion battery anode materials. By the aid of the low-temperature lithium ion battery anode material and the method, the technical problems of poor low-temperature performance of existing lithium ion batteries and incapability of meeting market demands on electric vehicles can be solved. A structural formula of the low-temperature lithium ion battery anode material is LiNi<x>Co<y>Mn<z>M<e>O<2>, wherein the x is larger than or equal to 0.5 and is smaller than or equal to 1, the y is larger than or equal to 0 and is smaller than or equal to 0.3, the z is larger than or equal to 0 and is smaller than or equal to 0.3, the e is larger than or equal to 0 and is smaller than 1, the sum of the x, the y, the z and the e is equal to 1, the M represents doped trace elements, and the doped trace elements are selectively a type of Al, Mg, Zn, Ce and La. The low-temperature lithium ion battery anode material and the method have the advantages that the low-temperature lithium ion battery anode material is high in specific capacity and first charge-discharge Coulomb efficiency and excellent in low-temperature performance, and the discharge capacity of the low-temperature lithium ion battery anode material at the low-temperatures at least can reach 85% of the discharge performance of the low-temperature lithium ion battery anode material at the normal temperatures under various multiplying power conditions.

The invention discloses a preparation method of a zein microsphere and an ultrasonic built-in dialysis device for preparing the zein microsphere. A dialysis bag of the device is positioned in a jacket kettle filled with a dialysis solution; the jacket kettle is connected with a constant-temperature tank; and an ultrasonic generator is connected with an ultrasonic transducer, the top of an ultrasonic amplitude transformer is connected with the ultrasonic transducer, the ultrasonic amplitude transformer extends into the dialysis bag and is fixed with the upper end of the dialysis bag, and the bottom of the ultrasonic amplitude transformer is positioned at the middle part of the dialysis solution in the dialysis bag. The method comprises the following steps: dissolving zein into an ethanol solution, placing a zein solution in the dialysis bag, putting the fixed dialysis bag into the dialysis solution, opening the ultrasonic generator, and controlling the ultrasonic power to be 150-225W; and performing freeze drying on a product obtained after dialysis to prepare the product. The zein microsphere obtained by using an ultrasonic built-in dialysis process disclosed by the invention is smooth in surface, has the particle size of 1-2 microns, is narrow in particle size distribution and good in dispersion performance, and can be used for oral administration and suction-type administration or can be prepared into a suspension for injection.

The invention provides a preparation method of flake silver powder. The method comprises the steps that water, silver salt, a complexing agent, a silver-plated brightener, a dispersing agent, sublimated flake compound crystals and a reducing agent are adopted as raw materials, a chemical plating method is adopted, silver is plated on the surface of the sublimated flake compound crystal until silver ions react completely, and after the reaction is finished, the flake silver powder is directly obtained through separation and purification and processing treatment processes without ball milling. The preparation method has a series of advantages of being low in energy consumption, small in environmental pollution, simple in production process, short in process route, low in the large-scale production equipment investment, high in production efficiency, lower in production cost, good in product dispersion performance, good in product conductivity and the like, the method is suitable for large-scale production, the problems existing in the process of preparing the sheet-like silver powder by a ball milling method are solved, and the method has the good industrialization prospects.

The invention relates to a method for effectively regulating a particle size of a ceric oxide mesoporous sphere and application thereof to preparation of ceric oxide mesoporous spheres of different scales. The method is characterized in that any other surfactant or inducer or stabilizer or template agent does not need to be added in the preparation process except cerate and a reaction solvent, and the scale can be effectively regulated by virtue of the moisture content in a precursor. The method comprises the following preparation steps: (1) sequentially adding deionized water and cerous nitrate into ethylene glycol under stirring conditions so as to obtain a precursor for preparing the ceric oxide mesoporous sphere; (2) reacting the reactive precursor solution in an oil bath of 180 DEG C for 0.5-6 hours, and preparing a yellow ceric oxide mesoporous sphere colloidal solution; (3) performing centrifugal separation on the ceric oxide mesoporous sphere colloidal solution by using a high speed centrifuge, performing ultrasonic cleaning for 3-5 times, thereby obtaining the ceric oxide mesoporous spheres of different scales. The ceric oxide mesoporous spheres prepared by the method disclosed by the invention can be applied to the aspects such as automotive exhaust purification, catalytic oxidation of carbon monoxide, mechanical polishing and the like.

The invention relates to the field of energy regeneration of lithium batteries, and provides a method for preparing a nickel cobalt lithium manganate lithium-ion battery positive material from waste lithium batteries. The method comprises the following steps: recycling the waste lithium ion batteries, dissolving into acid liquor to obtain a mixed metal solution, enabling calcium, magnesium, copper, zinc, lead, aluminum and other impurities in the mixed solution to enter an acid extractant organic phase, performing multistage refluxing on the organic phase loaded with the impurities, performing reverse extraction on the organic phase by using acid so as to regenerate the organic phase for reuse, and removing calcium, magnesium, copper, zinc, lead, aluminum and other impurities to obtain an impurity-free mixed solution; and conveying the prepared mixed metal solution and an additive solution into a freezing crystallization kettle to obtain nickel cobalt manganese lithium salt powder. By the method, nickel, cobalt, manganese and lithium elements are recycled from the waste batteries and waste positive materials, and after impurity removal, the nickel cobalt lithium manganate positive material is produced in a recycling manner so as to synthesize a regenerated product with the same performance as an original product in a directional recycling manner, so that resource reutilization of main metals in all the lithium-ion batteries is achieved.

The invention provides a preparation method of a piece shaped cobalt powder. The method is characterized in that water, cobalt salt, a complexing agent, a cobalt plating brightener, a dispersing agent, an antioxidant, a sublimable piece shaped compound crystal die plate and a reducing agent are used as the raw materials; cobalt is plated on the surface of the sublimable piece shaped compound crystal die plate by a chemical plating method until cobalt ions completely react; after the reaction, the product is separated, purified and processed, and thus the piece shaped cobalt powder can be directly obtained without ball milling. According to the technical scheme, the preparation method has a series of advantages such as low energy consumption, low environmental pollution, simple production process, simple and short technical routes, small investment on scale production equipment, high production efficiency, low production cost, high product dispersing performance and high product conductivity; the method is suitable for scale production; the problems in a technology for preparing the piece shaped cobalt powder by a ball milling mode can be solved; and the method has a good industrialization prospect.

The invention discloses a carbon nanosphere and a preparation method and application thereof. The carbon nanosphere includes carbon nano particles and a plurality of carbon thorns growing on the carbon nano particle surface, the carbon nano particles and the carbon thorns make the carbon nanosphere hedgehog-like. The preparation method of the carbon nanosphere comprises the steps of vacuum reaction chamber preheating, introduction of a protective gas and introduction of an organic carbon source into a vacuum reaction chamber for carbonization reaction. Due to growth of the plurality of carbon thorns on the carbon nano particle surface, the carbon nanosphere is hedgehog-like, has a rich surface and a large surface area, and is uniform in particle size. The preparation method has the advantages of simple process, easy control and high production efficiency.

The invention discloses a particle controllable preparation method and device based on an ultrasonic auxiliary continuous anti-solvent film dialysis process. A first sealed container of the device is connected with a first peristaltic pump. The first peristaltic pump is connected with a lower end connector of a film module shell pass. A fourth sealed container is connected with an upper end connector of the film module shell pass. A second sealed container is connected with a second peristaltic pump. The second peristaltic pump is connected with a lower end connector of a film module tube pass. Hollow fiber film bundles in a film module form a tubular structure, the tube pass of the film module is formed, and the space between the hollow fiber bundles and a film module shell forms the shell pass of the film module. By the adoption of the ultrasonic auxiliary continuous operation film module, the anti-solvent and solvent on the two sides of a film are controlled to penetrate towards the opposite sides correspondingly, raw materials are promoted to be separated out of a solution, and particle growth and dispersion are adjusted and controlled through dynamic dialysis and ultrasound enhancing, so that particles which are controllable in particle size, narrow in particle size distribution and good in dispersity are prepared efficiently, and the preparation method and device can be used for preparing various oral preparations or can be used for further processing of injections.

The invention discloses a titanium dioxide nanotube composite material and a method for depositing SnSe nanoparticles. The method comprises the following steps of: preparing titanium dioxide nanotubes by using a two-electrode system; and electrochemically depositing the SnSe nanoparticles on a titanium alloy or pure titanium with the TiO2 nanotubes. By the method, the defects of the prior art are overcome, high electro-catalytic efficiency is achieved, and the nanoparticles uniformly distributed on surfaces and having controllable size are obtained; and the whole process has the characteristics of low cost, simple preparation process.

The invention relates to a hollow aluminum alloy microsphere preparation device and a preparation method. The hollow aluminum alloy microsphere preparation device comprises a sealed shell, a crucible,an air blowing device and a vibrator, wherein the air blowing device comprises air blowing heads; the crucible is of a grooved structure with a hollow accommodating cavity in the side wall, and the hollow accommodating cavity is used for accommodating aluminum alloy melts; and hollow aluminum alloy microspheres are prepared through air blowing of the air blowing heads. By adjusting the gas flow rate and vibration frequency, the particle sizes of the microspheres can be effectively adjusted and controlled, so that the particle sizes of the prepared hollow aluminum alloy microspheres are smalland uniform; and furthermore, by controlling the particle sizes of the hollow aluminum alloy microspheres, the air hole size and distribution in foamed aluminum alloy can be controlled, so that the foamed aluminum alloy with small hole bubbles and uniform distribution are obtained. By adopting the preparation method of the device, the process is simple, no reaction template is required, the production process is short, and the cost is low.

The invention discloses a preparation method of flake copper powder. The method comprises the steps of adopting water, copper salt, a complexing agent, a copper plating brightener, a dispersing agent,an antioxidant, nickel salt, a sublimable flake compound crystal template or a crystal template containing an acid compound or a crystal template containing a flake alkaline compound, and a reducingagent as raw materials; adopting a chemical plating method for plating copper on the surface of the compound crystal template until a copper ion is completely reacted; and after finishing reaction, carrying out separation, purification and a processing treatment process, and directly obtaining the flake copper powder without the need for ball milling. The preparation method of the flake copper powder provided by the invention has a series of advantages of low energy consumption, low environment pollution, simple production process, short process route, less large-scale production equipment investment, high production efficiency, low production cost, good product dispersibility and conductivity and the like, is suitable for large-scale production, solves the problem existed in a process forpreparing the flake copper powder through a ball milling method, and is good in industrial prospect.

The invention relates to a hydrophilic amide polymer self-assembly particle drug release system suitable for hydrophobic drugs and a preparation method thereof. The system comprises a hydrophilic amide polymer, a hydrophobic carboxyl-containing compound and a hydrophobic drug, wherein the hydrophilic amide polymer comprises poly(N-methacrylamide), poly(N-ethylacrylamide), poly(N-n-propylacryamide) and a copolymer of the poly(N-methacrylamide), the poly(N-ethylacrylamide) and the poly(N-n-propylacryamide). The preparation method comprises the following steps: dissolving the hydrophilic amide polymer, the hydrophobic carboxyl-containing compound and the hydrophobic drug in a water-soluble organic solvent; putting the obtained organic solution in a dialysis bag, dialyzing in deionized water under the condition of magnetic stirring and changing the deionized water at a certain time interval; and centrifuging to collect the product after 6-72 hours and carrying out freeze-drying to obtain the system.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a nano zero-valent iron-copper-carbon microsphere material and a preparation method thereof. Raw materials of the iron-carbon-copper composite material comprise an iron monomer, a carbon monomer and a copper monomer. The preparation method comprises the following steps of firstly, mixing an iron monomer, a carbon monomer and a copper monomer, mechanically grinding for 2-4 hours, and drying, and calcining to obtain the material. The nano zero-valent iron-copper-carbon microsphere material prepared by the invention provides powerful method support for micro-electrolysis and micro-electrolysis-Fenton-like efficient degradation of water environment pollutants, especially pollutants in chemical wastewater.