86results about How to "Particle Size Control" patented technology

The invention discloses a class of fluorescent nanoparticles and a preparation method and an application thereof. The fluorescent nanoparticle comprises matrix material and fluorescent dye dispersed in the matrix material, wherein the matrix material is the compound composed of hydrophobic polymer main chain of which is hydrocarbon chain, organo-siloxane and organosilicon-polymer, and the fluorescent dye is rare earth complex with photoluminescence performance. The preparation method of the fluorescent nanoparticle comprises the following steps: dissolving rare earth complex, hydrophobic polymer and compound RSi (OR') 3 into organic solvent miscible with water; adding the mixture into aqueous solution containing surfactant; using precipitation and hydrolytic condensation reaction to form nanoparticles. The nanoparticle of the invention has favourable luminous performance and favourable stability, can have a silicon oxide shell and a surface functional group and can be used for bondingbiomolecules; biological probes based on the fluorescent nanoparticle have wide application prospects on the aspects of high-sensitivity fluorescence immunoassay, imaging and the like.

The invention discloses a cuprous oxide nanocrystalline with adjustable morphology and dimension as well as a preparation method and an application thereof. The preparation method comprises the following steps: copper hydroxide which is used as a precursor is synthesized; the pH value of the system is regulated; the system whose pH value is regulated is reduced in order to obtain cuprous oxide nanocrystalline. A surfactant is not needed to add, the cuprous oxide nanocrystalline with specific morphology and dimension can be obtained by adjusting the pH value of the reaction system, and the nanocrystalline can be used for photocatalytic degradation of organic pollutants, and the method is a rapid, simple and green preparation method of cuprous oxide nanocrystalline.

The invention provides a method for efficiently concentrating cobalt and nickel from a low-grade nickeliferous laterite ore. The method is based on mine-phase reconstruction, and the ore is subject to physical treatment, high temperature chlorination and reduction roasting to convert the nickel and the cobalt in the ore from oxide or composite oxide (silicate and ferrite) mineral into magnetic metal or alloy, magnetic separation method or combined floatation-magnetic separation method is used for separation to concentrate the cobalt and the nickel. The method is used for treating the low-grade nickeliferous laterite ore (Ni is 0.2-2.0%), contents of the nickel ore concentrate is more than ten times of that of the crude nickel ore; and the nickel recovery is more than 80%.

The invention discloses a method for preparing TiO2 nanocrystal particles, which comprises the following steps: dispersing titanic acid nanotubes in an oxydol water solution, and carrying out hydrothermal reaction to obtain monodisperse high-photocatalytic-activity anatase TiO2 nanocrystal particles. The process for preparing the titanic acid nanotubes comprises the following steps: mixing a titanium source and a sodium hydroxide water solution, carrying out hydrothermal reaction to obtain sodium titanate nanotubes, and carrying out acid exchange on the sodium titanate nanotubes to obtain the titanic acid nanotubes; or mixing a titanium source and a potassium hydroxide water solution, carrying out hydrothermal reaction to obtain potassium titanate nanotubes, and carrying out acid exchange on the potassium titanate nanotubes to obtain titanic acid nanotubes; or carrying out anode oxidation on metal titanium in a fluorion-containing electrolyte to obtain the titanic acid nanotubes.

The invention relates to a high-strength temporary blocking agent for oil and gas wells and a preparation method and application thereof. The temporary blocking agent for oil and gas wells is prepared from the following ingredients through crosslinking reaction: thickening agent, dispersing agent, adhesive and a temperature resistant material with mass ratio of (2.5-3):(1.3-2):(2.8-3):(1.7-2), preferentially, 3:2:3:2. The temporary blocking agent for oil and gas wells has the advantages of high strength, filter cake formation, good solubility and controllable time, flowback is facilitated and the method is simple to operate.

The invention provides a preparation method of metal powder and alloy powder. The preparation method comprises the following steps that powder of an oxide or a mixture of several oxides or a pressed piece is composited with a metal current collector to be served as a cathode, graphite is served as an anode, molten alkaline earth metal halide with excessive alkaline earth metal oxides or alkali halide with excessive alkali metal oxides or a mixture of the molten alkaline earth metal halide and the alkali halide is served as an electrolyte, in a protective atmosphere, electrolysis is performed for 1-5 hours with the electrolysis temperature being 400-900 DEG C and the electrolysis voltage being 1.4-3.2 V, a product is taken out after being cooled to the normal temperature, then the product is washed in distilled water, dilute acid or an organic solvent, and the metal powder or alloy powder is obtained after the product is subjected to vacuum drying. According to the preparation method of the metal powder and alloy powder, the particle size is controllable, and thus the metal powder and alloy powder are directly prepared.

The invention discloses a graphene-silicon dioxide composite wall-material phase-change nanocapsule and a preparation method thereof. A core material of the phase-change nanocapsule is a paraffin phase-change material, a wall material of the phase-change nanocapsule is a graphene-silicon dioxide composite material, and the particle size of the nanocapsule is nanometer scale. The preparation methodcomprises the following steps: mixing the phase-change material with an alkoxy silane compound so as to obtain an oil phase, adding a cationic surfactant and a water/ethanol mixed solvent, and carrying out high-speed shearing and ultrasonic refining so as to obtain an oil-in-water type fine emulsion; dispersing graphene into deionized water under the assistance of an anionic surfactant so as to form stable graphene dispersion liquid; and dropwise adding the graphene dispersion liquid into the fine emulsion, sequentially adding ethanol and a basic catalyst, heating to react, filtering, washing, and drying, so as to obtain a black powder product. The wall material of the phase-change nanocapsule is the graphene-silicon dioxide composite material, so that a supercooling phenomenon of the phase-change nanocapsule can be eliminated, and meanwhile, the heat conductivity coefficient and heat stability of the phase-change nanocapsule can be increased.

The invention relates to a SiOx-C composite negative electrode material with a core-shell structure and a preparation method thereof. The composite negative electrode material comprises a conductive core M, a SiOx layer and a carbonaceous shell; the surface of the conductive core M is coated with SiOx gas in an in-situ deposition mode to form a core-shell structure of the conductive core M@SiOx layer; the surface of the core-shell structure is coated with a carbon source precursor through a pyrolytic reaction to form the carbonaceous shell; the preparation method comprises the following stepsof placing the conductive core in a furnace with inert gas protection; introducing the SiOx gas into the furnace to deposit on the surface of the conductive core to form the M@SiOx core-shell structure; and carrying out uniform mixing on the core-shell structure and the carbon source precursor and then performing the pyrolysis reaction to obtain the M@SiOx-C composite negative electrode material with the core-shell structure. The SiOx-C composite negative electrode material with the core-shell structure prepared in the invention has the advantages of high conductivity, high first coulombic efficiency and high cycling stability. The preparation method is simple in process flow, easy to control, low in synthesis cost and suitable for large-scale production.

The invention discloses an efficient pulverizer for ceramic production. The efficient pulverizer for ceramic production comprises a first pulverizing cavity, a pulverizing roller and a hydraulic cylinder, wherein the outer wall of the first pulverizing cavity is covered with an electric heating layer, the upper side of the first pulverizing cavity is connected with a feeding funnel, a first rotary shaft is vertically arranged at the axis position of the inside of the first pulverizing cavity, screw blades are evenly arranged on the outer wall of the first rotary shaft, an air outlet pipe is horizontally arranged at the left end of the outer wall of the lower side of the first pulverizing cavity, and the left end of the air outlet pipe is connected with an exhaust fan. The efficient pulverizer for ceramic production integrates material pulverizing and drying functions, ensures the quality of processed finished products and fully pulverizes materials through two pulverizing mechanisms, an oblique pulverizing gap enables pulverizing time to be long and enables pulverizing to be sufficient, the material pulverizing effect is ensured, the size of pulverized material particles can be controlled, practicability is high, dehumidification is performed in the drying process through a drying device, drying efficiency is improved, noise in the working process of the efficient pulverizer is small, and a working environment of an operator is improved.

The invention discloses cyclodextrin modified nano-silver hydrogel, and a preparation method and an application thereof. The cyclodextrin modified nano-silver hydrogel contains 0.1%-0.4% by mass of nano-silver particles modified by in-situ reduction of cyclodextrin, the nano-silver particles are uniformly dispersed, the tensile strength of the cyclodextrin modified hydrogel is 3.5-6 MPa, and the relative standard error for measuring a molecular surface scanning Raman signal is lower than 10%. The preparation method comprises the following steps: (1) uniformly mixing cyclodextrin with a silver salt aqueous solution to obtain a mixture, and heating under an alkaline condition to react to obtain cyclodextrin modified nano-silver gel; and (2) adding a gelator, and preparing the cyclodextrin modified nano-silver hydrogel via a frozen gel forming method. The cyclodextrin modified nano-silver hydrogel provided by the invention is good in uniformity, strong in repeatability, good in mechanical property, sensitive in detection, simple to prepare and mild in reaction, and is used as a surface enhanced Raman substrate.

The invention discloses a composite condensation product with a double-embedding function as well as a preparation method and application of the composite condensation product. The preparation methodcomprises the following steps: (1) adding Zein into an ethanol water solution, and carrying out stirring for dissolving to obtain a Zein solution; (2) adding chitosan into an acetic acid solution, carrying out stirring for dissolving, and then carrying out overnight hydration to obtain a chitosan anti-solvent solution; (3) adding curcumin and quercetin into the Zein solution, carrying out uniformstirring and mixing, and then carrying out overnight hydration to obtain a Zein-Cur-Que mixed solution; and (4) adding the chitosan anti-solvent solution into the Zein-Cur-Que mixed solution, carryingout uniform stirring and mixing, then carrying out rotary heating to remove ethanol, and then adjusting the pH value to 3.0-7.0 to obtain the composite condensation product with the double-embeddingfunction. The composite condensation product disclosed by the invention can simultaneously embed two substances with different polarities, is high in embedding rate and high in bioavailability, and can be used in the field of food processing.

The invention relates to an organic-inorganic hybrid shell bifunctional phase change capsule and a preparation method thereof. The material comprises a main body material, a monomer, an initiator andan emulsifier, wherein the mass percentage content of each component is as follows: 25%-75% of the main body material, 30%-50% of the monomer, 0.5%-3% of the initiator and 2%-20% of the emulsifier; the main body material is industrial organic paraffin with a melting point of 5-58 DEG C; and in the preparation process, the polydivinylbenzene/TiO2 hybrid shell bifunctional phase change capsule withadjustable micron-scale to nano-scale particle sizes is prepared through Pickering emulsion polymerization. According to the preparation method, the organic-inorganic mixed phase is pretreated throughhigh-speed dispersion under the condition that a co-emulsifier is not added, so that the organic-inorganic hybrid shell bifunctional phase change capsule has a smaller micro-nano size, and the prepared capsule has better heat-conducting property and mechanical property; the heat transfer rate is improved; and moreover, the excellent formaldehyde light degradation performance is also realized.

The invention relates to a preparation method of particle size homogeneous nanometer spinel ferrite, which belongs to the art of the metal oxides preparation. Metallic ion is first deoxidized into highly scattered nanometer metallics in a colloid mill, and then the blended solution containing the nanometer metallics is transferred into a Teflon gallbladder for water hot crystallization under high-pressured reaction so as to form the spinel ferrite particle with a diameter of 5 to 200 nanometers. The invention has the advantages that the high-speed shearing action of the colloid mill ensures that the deoxidized metallics are highly dispersed, thereby enabling the particle size homogeneous nanometer spinel ferrite. The reaction is carried in the solution, and the diameter of the nanometer particle can be controlled through adjusting the reactant density, the reaction temperature and the reaction time; since no need for high-temperature roasting process in the reaction, the operation becomes quite easy. Moreover, the invention has low cost and low energy consumption, thereby being favorable for industrialized application.

The invention discloses a nitrogen-doped carbon quantum dot and a preparation method thereof. The method comprises the following steps: providing an organic phenol, mixing the organic phenol with peroxide in a solvent to carry out a phenolic hydroxyl oxidation reaction to obtain an organic hydrazine; and providing an organic amine to react with the organic hydrazine in a closed environment to obtain the nitrogen-doped carbon quantum dot. By using organic phenol, organic amine, peroxide and deionized water as raw materials, the nitrogen-doped carbon quantum dot which has stable fluorescence performance and stable chemical properties and is dispersible in water and environment-friendly is synthesized. By regulating the ratio of the raw materials and the reaction time, the structure, particlesize and optical performance of the nitrogen-doped carbon quantum dot are regulated. No heat source is needed by the method such that energy consumption is low, cost is low and operation is simple. Meanwhile, the nitrogen-doped carbon quantum dot material prepared by the method does not contain heavy metals such as Cd and Te, and has wider application fields than traditional quantum dot materials.

The invention discloses a method for preparing microcrystalline celluloses by acid hydrolysis after pretreatment through high shear machinery. The method comprises the following steps: firstly, pulping and filtering wood dissolving pulp or refined cotton by high shear machinery to obtain pretreated pulp; mixing the pretreated slurry with acid liquor, and carrying out acid hydrolysis reaction to obtain an acid hydrolysis reaction product; finally, filtering the acid hydrolysis reaction product to obtain hydrolyzed celluloses; and washing the hydrolyzed celluloses to be neutral, and carrying outspray drying to obtain microcrystalline celluloses. According to the invention, the wood dissolving pulp or refined cotton is subjected to pulping pretreatment by the high shear machinery, the actingforce of the high shear machinery is used for cutting off fibers in the pretreatment process, so that the porosity and the specific surface area inside the fibers are increased, the accessibility ofacid liquor to the celluloses is improved, the penetration speed of the acid liquor into the celluloses is increased, the acid hydrolysis rate of the acid liquor to a cellulose amorphous region is increased, and the dosage of chemicals is reduced or the reaction time is shortened. The particle size of the microcrystalline cellulose product is regulated and controlled.

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.