123results about How to "Uniform and controllable size" patented technology

The invention provides a high-temperature and high-pressure single-drop evaporating and burning device. The high-temperature and high-pressure single-drop evaporating and burning device comprises a gas supplying device, a burning and evaporating projectile body (15), a single-drop generator (7), a single-drop generator cooling device and a control unit (13), wherein the burning and evaporating projectile body (15) is connected with the gas supplying device; the single-drop generator (7) and the single-drop generator cooling device are positioned at the upper part of the burning and evaporating projectile body (15); the control unit (13) is connected with the burning and evaporating projectile body (15) by a wire; the single-drop generator (7) comprises a piezoelectric piece type sprayer inside; the single-drop generator cooling device comprises a water pump (8) connected with the single-drop generator (7) and a thermocouple wire temperature sensor (9) positioned in the single-drop generator (7). The high-temperature and high-pressure single-drop evaporating and burning device provided by the invention has the advantage that the research for micro-drop evaporating and burning characteristics can be realized.

The invention discloses a device for efficiently preparing superfine spherical metal powder with a high melting point. The device comprises a shell, and a crucible and a powder collecting area which are arranged in a chamber of the shell, and is characterized in that a plurality of melting pools with the same volume are formed inside the crucible, and gaskets with small holes which are communicated with the chamber are fixed at the bottoms of the melting pools; a transmission rod comprises transmission support rods with the number the same as that of the melting pools, and the bottoms of the transmission support rods are aligned with circular holes in the gaskets with small holes; a thermocouple is arranged inside the crucible, and an induction heater is arranged outside the crucible; and the powder collecting area comprises a rotating disk which is used for atomizing metal droplets and is arranged at the bottom of the chamber and connected with a motor, and a collecting tank is also formed in the bottom of the chamber. The invention also discloses a method for efficiently preparing superfine spherical metal powder with the high melting point. By mainly combining a pulse micropore injection method with a centrifugal atomization method, the method can be used for preparing superfine spherical metal powder which is narrow in particle size distribution interval, high in sphericity, good in spreadability and liquidity, and high in production efficiency, and meets the 3D printing and using requirements.

The invention relates to a microflow chip comprising synthesized channel and two beam focusing ball tracks, in which two exits of beam focusing ball tracks converge at the entrance of the synthesized channel, each beam focusing ball track comprises prepolymer microsphere track, discontinuous phase track and two continuous phase channels, the said two continuous phase channels distribute on both sides of the discontinuous phase track, the prepolymer microsphere track, discontinuous phase track and continuous phase channels evenly have ingate and exit and the exits of the discontinuous phase track and continuous phase channels converge at the ingate of the synthesized channel. The invention also provides a method for preparing polymer microsphere using the said microflow chip: injecting two continuous phases from ingates of continuous phase channels of two beam focusing channels, injecting discontinuous phase from discontinuous phase channels of beam focusing channels, then obtaining polymer microsphere from the synthesized channel exit. The invention can exactly prepare controllable polymer microsphere with coincidence sizes.

The invention relates to a preparing method of a porous carbon nanotube-charcoal spherical composite material. The method includes dispersing carbon nanotubes; preparing a resin diluting liquid; adding the carbon nanotubes to obtain a uniform suspension; adding a curing agent to form a balling liquid; adding the balling liquid into a layering oil bath dropwise, suspending, curing, separating, washing and drying in order to obtain small composite balls; subjecting the composite balls to carbonization and activation to obtain small activated balls; and cleaning and drying the small activated balls to obtain the porous carbon nanotube-charcoal spherical composite material. The preparing method combines a dropping method and layered oil bath curing to prepare the composite material. A dropping process is adopted so that the ball size is uniform and grading is not required. The content of the carbon nanotubes in the prepared composite material is far higher than that at present. The composite material is wide in ball size range and uniform and controllable in size. The small balls are relatively loose. Surface activability and inner activability of whole balls are excellent.

The invention discloses a preparation method of rodlike nano-calcium carbonate. The method comprises the steps of: (1) calcination; (2) slaking reaction; (3) carbonization; and (4) drying moulding. The rodlike nano-calcium carbonate obtained by the method provided by the invention has an average particle size of 180-260nm, a length of 0.8-1 micrometer, a width of 60-90nm, and a surface Zeta potential ranging from -10 to -30mV. The preparation method of the rodlike nano-calcium carbonate provided by the invention has the advantages of simple operation, easy realization and good repeatability. The prepared calcium carbonate nanorods have the characteristics of uniform and controllable size, good dispersibility and stable performance, and have good application prospects.

The invention discloses a tin-based nanoparticle-carbon composite material. The tin-based nanoparticle-carbon composite material comprises a carbon substrate material and tin-based nanoparticles uniformly distributed on the carbon substrate material. The invention also discloses a preparation method for the composite material, wherein the preparation method comprises the steps of enabling tin powder and/or tin alloy powder to be uniformly mixed with a carbon material and a flux; and then heating the formed mixture in an oxygen-containing atmosphere to a temperature which is greater than a tin or tin alloy melting point, and performing thermal insulation to prepare the target product. The tin-based nanoparticles in the composite material are small in dimensions (about 5-20nm), uniform and controllable, and are uniformly distributed on the carbon substrate material, so that the tin content of the composite material can be adjusted at 5-80wt%; therefore, the danger caused by tin volume expansion is greatly relieved, and high specific capacity and cycling stability are achieved, so that the composite material can be used for a negative electrode material of a lithium ion battery; meanwhile, the composite material has simple preparation process, low-price and easily-available raw materials, low cost, and low pollution, is suitable for large-batch industrialization, and also can be expanded to preparation of other metal-based nanoparticle-carbon composite material.

The invention discloses macroporous Prussian blue nanoparticles and a preparation method thereof. The preparation method comprises the following steps of: (1) adding an iron source and an organic substance with effects of reduction and stabilization into an acidic solution S1, and performing magnetic stirring until a clear mixed solution is obtained; (2) transferring the mixed solution to an ovenof a temperature of T1 DEG C, performing aging for H1 hours, cooling to room temperature, performing centrifugal separation, performing washing with deionized water multiple times, and performing dissolution in an acidic solution S2 for later use; and (3) transferring the solution to a hydrothermal kettle, placing the hydrothermal kettle in an electric furnace at a temperature of T2 DEG C, performing aging, cooling to room temperature, performing centrifugal separation, conducting water washing, and carrying out drying to obtain the macroporous Prussian blue nanoparticles with a pore size of 3-20 nm and a size of 20-200 nm. The prepared macroporous Prussian blue nanoparticles have the characteristics of high dispersion and uniform size, and have a simple preparation process, low raw material cost, easy regulation, a novel method and an extremely wide application prospect.

The invention belongs to the technical field of preparation of Fischer Tropsch synthesis catalysts, and particularly discloses a Fischer Tropsch synthesis catalyst for preparing a heavy hydrocarbon product through synthesis gas and a preparation method of the catalyst.The method includes the steps of preparing nanometer silicon dioxide spheres of a mesoporous structure, wherein the granularity of the spheres is 20-50 nm; adding the nanometer silicon dioxide spheres when cobaltosic oxide particles are prepared to obtain a cobalt-based catalyst, wherein the specific surface area of the catalyst reaches up to 762.1 m<2>.g<-1>, the pore capacity reaches 1.81 cm<3>.g<-1>, dual-pore pore size distribution is achieved, and cobaltosic oxide particles are uniform in size and high in dispersity and evenly dispersed among the nanometer silicon dioxide spheres.The catalyst is beneficial to dispersion of reactants and products when used for Fischer Tropsch synthesis reaction and has high activity and stability, low methane selectivity and high heavy hydrocarbon selectivity, and the heavy hydrocarbon selectivity reaches up to 85.5% or above.

The invention relates to a method for preparing a graphene nano-material electrochemical sensor by an atomic layer deposition process. The method comprises the following steps of: placing a hydrophilic graphene oxide into a reaction cavity of an atomic layer deposition device to perform deposition of a TiO2 protective film, reducing a TiO2 nano-coated graphene oxide product to obtain a TiO2/graphene composite material, preparing TiO2/Nafion into a mixed solution, dripping and coating the mixed solution on the surface of a glass carbon electrode, and drying under an infrared lamp to obtain the electrochemical sensor of the glass carbon electrode. The electrochemical sensor prepared by the method disclosed by the invention has the advantages of low cost, simplicity and convenience in operation and high sensitivity.

The invention relates to a preparation method for ferric phosphate. A ferric phosphate hydrate precursor is synthesized by adopting a coprecipitation method; and the precursor is subjected to aging, washing, drying and heat treatment to obtain the ferric phosphate. By improving the preparation condition of the ferric phosphate, effective control on granular dimensions and appearance of the ferric phosphate is realized, and the ferric phosphate material with uniform granules, regular appearance, narrow grain diameter distribution range, uniform and controllable dimensions and the nano-micro structure can be further obtained; and the obtained ferric phosphate material can be used for preparation of a positive electrode material lithium iron phosphate of a lithium ion battery. The preparation method provided by the invention has mild reaction conditions, simple and flexible operation and low cost; and meanwhile, the yield is improved, and batch production and wide application prospect of the material are achieved.

The invention provides a preparation method of a nanoparticle interconnecting material with a core-shell structure. The preparation method of the nanoparticle interconnecting material with the core-shell structure comprises the steps of (A) mixing nano-copper particles and a protection agent, and obtaining a nano-copper solution; (B) mixing a shell layer precursor and the nano-copper solution, reacting, and centrifugally washing to obtain core-shell dual-metal nanoparticles; and (C) dispersing the core-shell dual-metal nanoparticles into a solvent, and defoaming to obtain the nanoparticle interconnecting material with the core-shell structure. The shell layer prepared through the invention is compact in metal form, uniform and controllable in size, and easy to generate atomic diffusion ata lower temperature, and is connected with the nano-copper particles to form a three-dimensional interconnecting system, so that not only are the inoxidizability and the stability of the core layer nano-copper particles improved, but also an interconnecting temperature and an interconnecting condition are greatly reduced. A chip and a substrate can be interconnected under a low-temperature non-pressure condition, and a semiconductor device is connected and packaged, so that the nanoparticle interconnecting material with the core-shell structure can be better applied to the fields of semiconductor device manufacturing and microelectronic packaging, power electronics packaging and the like.

The invention discloses a preparation method for magnesium nano-particles, which belongs to the technical field of nano-material preparation. The invention is characterized in that the MgO nano-particles are prepared by adopting the method of arc discharge in liquid nitrogen medium, consumable pure magnesium anode under the non-vacuum condition, wherein, an inner hole is opened at the end face of a cathode, and an anode is arranged in the inner hole at the end part of the cathode. Under the action of air flow, air is involved in a reaction zone of arc discharge, oxygen atoms are supplied for the generation of MgO, and the nano-particles of the MgO are synthesized by the arc discharge. The preparation method has the advantages of simple equipment and controllable process parameters. The industrial pure magnesium stick which is taken as raw material in preparation is abundant and the cost of the raw material is low. Mg nano-particles with the shapes such as non-regular flake, hexagonal flake, hexagonal lantern, nearly hexagonal structure or nearly spherical shape can be prepared, and the particles have no other pollutions.

The present invention relates to one kind of microbubble acoustic contrast medium of new type polymer material capable of being degraded naturally in body and the preparation process of the contrast medium with or without coated medicine or gene. The preparation process of the acoustic contrast medium with artificially synthesized biodegradable polymer material includes emulsification, preparing microballoon of polymer material shell and coated volatile organic solvent and water solvent, and spraying or freezing to dry and to volatize or sublime the solvent so as to obtain the microbubble acoustic contrast medium. The present invention has the advantages of natural degradation of the shell material, homogeneous and controllable grain size, good development effect, long lasting time, less back attenuation, capacity of coating medicine or gene, capacity of realizing located release of medicine and located transfection of gene, etc.

The invention provides a magnetic compound diatomite material and a preparation method thereof. The magnetic compound diatomite material contains active components and a carrier, wherein the active components include nano-MnO2 and Nano-Fe2O3; the carrier is diatomite; the shell size of the diatomite is 10-50 microns, and the specific surface area of the diatomite is 1m<2>/g-4m<2>/g. Compared with the prior art, the magnetic compound diatomite material provided by the invention has the advantages that the diatomite is used as the carrier so as to successfully load nanometer iron and manganese oxides in a symbiotic state, and the loading effect of the nanometer iron and manganese oxides is ideal, so that nano-particles have uniform and controllable sizes and consistent shapes based on that the structure of a product is stable; furthermore, the components of the prepared magnetic compound diatomite material generate a synergistic effect, so that the product simultaneously has relatively good electrochemical performance and water treatment performance.

The invention discloses biocompatible water-core microcapsules and a preparation method thereof. The method disclosed by the invention selects edible red lac with anti-oxidization and moisture-proof functions as a covering material; the red lac and hydrophilic molecules are dissolved into a mixed solution of water and ethanol at the volume ratio of 1 to 2; then the solution is emulsified into micro-drops with a uniform size by utilizing a microfluidic chip. The solubility of the red lac in the mixed solution is gradually reduced along with the gradual volatilization of the ethanol in the micro-drops; finally, the red lac is precipitated and separated out on the surfaces of the micro-drops and is finally cured to obtain the biocompatible water-core microcapsules for covering the hydrophilic molecules. The water-core microcapsules prepared by the preparation method adopt a microfluidic technology and take single emulsion as a template; a preparation process is simple and the prepared microcapsules have a uniform size and good biocompatibility and can cover the hydrophilic molecules to control the releasing of the hydrophilic molecules; the biocompatible water-core microcapsules have wide application value.

The invention discloses a preparation method of monodisperse polymer fluorescent microspheres. The preparation method comprises the following steps: (1) synthesizing a europium-containing ternary complex by adopting a coordination reaction; (2) preparing carboxyl polystyrene microspheres by adopting a soap-free emulsion polymerization method; and (3) permeating the europium complex into the functional microspheres by a one-step seed swelling method to obtain the fluorescent carboxyl polystyrene microspheres with fluorescent substances wrapped in the microspheres. Fluorescent functional microspheres are obtained through a one-step swelling method, seed microspheres used for swelling come from carboxyl latex microspheres obtained in a soap-free emulsion polymerization mode, operation is easy, and the obtained microspheres are uniform and controllable in size and regular in surface.

The invention provides polybenzoxazole nanofiber high-intensity heat insulation fireproof aerogel and a preparation method thereof, and belongs to the technical field of aerogel and the preparation method of the aerogel. The inside of the aerogel product is of a network interpenetrating structure formed by nanofiber; the nanofiber has the diameter dimension being 10 to 50nm, the density being 20 to 50mg cm<-3> and the specific surface area being 200 to 400m<2>9<-1>; the porosity is 95 to 99 percent; the energy storage modulus is 2 to 2.5MPa. The method comprises the steps that commercial 1 weight-percent PBO (poly-p-phenylenebenzobisoxazole) fiber is dissolved in a mixed acid solution containing methane sulfonic acid and trifluoroacetic acid with the volume ratio being (0.7 to 0.8):(9.2 to 9.3); stirring is performed for 8 to 12 minutes; the PBO mixed acid solution is prepared and is then poured into a mold; the PBO mixed acid solution together with the mold is put into environment with the humidity being 96 to 99 percent for 46 to 50 hours, so that the PBO mixed acid solution is gelated; PBO gel is soaked by water and is washed until the PH value of the PBO gel is equal to 7; supercritical carbon dioxide is used for performing drying for 10 to 14 hours; the PBO nanofiber aerogel is obtained.

The invention discloses a patterned hydrogel antifouling material and a preparation method thereof. Specifically, the patterned hydrogel antifouling material is a double-network nanocomposite hydrogel, wherein the surface of the double-network nanocomposite hydrogel is provided with hemispherical micro bulges; the double-network nanocomposite hydrogel comprises a first network hydrogel, a second network hydrogel and nanoparticles; and the nanoparticles are doped in the first network hydrogel and the second network hydrogel. Compared with the prior art, the patterned hydrogel antifouling material provided by the scheme of the invention remains excellent mechanical properties of the double-network nanocomposite hydrogel, is free of any biocides, and has higher underwater lipophobicity and antifouling performance compared with a smooth hydrogel material.

The invention provides a preparation method of a lithium titanate negative electrode material with controllable particle size for a lithium battery. The preparation method comprises the steps of 1, dissolving a lithium source, a titanium source, a surfactant, a complexing agent and a buffer agent in water; 2, performing hydrothermal reaction on the product in the first step for 12-24 hours under 120-200 DEG C; 3, drying the product of the second step; and 4, roasting the product of the third step for 2-12 hours under 700-900 DEG C. By the preparation method, the hydrolysis rate of organic titanium can be effectively controlled, and the lithium titanate material with uniform and controllable particle size, obtained by preparation, has high cycle stability, high capacity, high-rate charge-discharge performance and high safety.

The invention provides a monodisperse boric acid cross-linked polyvinyl alcohol embolism microsphere, the base material of the microsphere is boric acid cross-linked polyvinyl alcohol, the embolism microsphere is spherical, the particle size variation coefficient does not exceed 5%, and the particle size is 30-500 [mu]m. The invention also provides a preparation method of the embolism microsphere, which comprises the following steps: inputting an internal phase fluid into an injection tube of a microfluid device, inputting an external phase fluid into a collecting tube of the microfluid device, forming a monodisperse water-in-oil emulsion in the collecting tube, and collecting the monodisperse water-in-oil emulsion by adopting a container filled with collecting liquid, and in an alkaline environment provided by sodium hydroxide in the collected liquid, initiating a polymerization reaction of polyvinyl alcohol and boric acid in a liquid drop water phase of the monodisperse water-in-oil emulsion, and after sufficient polymerization reaction, converting the monodisperse water-in-oil emulsion into the monodisperse boric acid crosslinked polyvinyl alcohol embolism microspheres. According to the method, the monodispersity of the embolism microspheres is improved while rapid, continuous and non-toxic preparation of the embolism microspheres is realized, and the possibility of mistaken embolism is reduced.