89results about How to "Uniform surface distribution" patented technology

The invention relates the method for preparing rich silver antibiotic film used for medical pyrolytic carbon and TiN film. It solves the antibiosis question. The method comprises the following steps: on the pyrolytic carbon: a buffing and cleaning; b evacuating; c sputtering and cleaning for 5 minutes with 1keV nitrogen ion; d injecting silver ion: 70, 30keV energy, 2-8mA beam current, 2X1014/cm2-3X1014/cm2 dosage, and forming rich silver antibiotic film and antibiosis ratio being 100%; on TiN film: a buffing and cleaning; b evacuating; c sputtering and cleaning for 5 minutes with 1keV nitrogen ion; d sputtering Ti target with 3keV, 80mA Ar+ ion, 20-40keV, beam current: bombarding with 2-8mA high-energy N+ ion for 10-20 minutes; 50-350eV, beam current: bombarding with 10-30mA low-energy N+ ion for 60-180 minutes to deposit, N2 air pressure being 8X10 3Pa; e injecting silver ion: 30-80keV, beam current: 2-8mA, 1X1017/cm2-5X1018/cm2 dosage, forming rich silver antibiotic film and antibiosis ratio being 90%. The film has the advantages of good abradability, strong adhesive force and anti-corrosion, good cell compatibility and long antibiosis time-effect. The film can be used to prepare artificial heart valve and hard tissue alternate material which is implanted in human.

The invention discloses a gas diffusion layer and a preparation method and application thereof. The gas diffusion layer comprises a carbon black layer (2) with the micropore diameter of 30 to 100 microns and/or a carbon fiber layer (1) with the micropore diameter of 50 to 150 microns. The gas diffusion layer can be widely applied to gas diffusion electrodes in fuel cells, electrolytic cells and ultracapacitor electrochemical reaction devices. The invention simultaneously discloses a preparation method of the gas diffusion layer. The gas diffusion layer has a simple, rational and compact structure, overcomes various defects of the prior art, and has the advantages of high air permeability, high drainage, high conductivity, stable catalyst layers and high catalyst utilization rate.

The invention discloses a method for preparing a composite cathode material of a silicon-carbon nanotube of a lithium ion battery. According to the method, firstly, the surface of nano silicon is coated with a carbon source, carbon nanotubes are generated in microwave treatment, and furthermore the surface of silicon is also coated with an introduced catalyst, so that the carbon nanotubes which are coated with the carbon source and are generated through catalytic cracking are very uniformly distributed on the surface of nano silicon, the problems that in the prior art the nano silicon is high in volume expansion effect, low in first charge/discharge efficiency and poor in circulation stability are solved, and both the conductivity and the mechanical property of the composite cathode material prepared by using the method disclosed by the invention are greatly improved and the circulation property, the multiplying power charge and discharge performance and the initial charge-discharge efficiency of the composite cathode material as a lithium lion battery cathode material are all greatly improved when being compared with those of a silicon-carbon nanotube cathode material which is mixed in a mechanical ball-milling manner as silicon and carbon nanotubes are compounded in an in-situ manner in the method disclosed by the invention. In addition, the method disclosed by the invention is simple in process, and the energy consumption is greatly reduced due to the adoption of a simple and efficient microwave chemical method.

The invention discloses a high-temperature-resistant methanation catalyst as well as a preparation method thereof. According to the catalyst, Al2O3 is used as a carrier, Ni is used as a primary active component, La and Ce are used as secondary components, and metallic oxides of Mn, Co, Fe, W or Mg are used as other active auxiliaries; the preparation method of the catalyst comprises the following steps: carrying out ultrasonic dispersion and coprecipitation on the primary active component Ni and a PEG (polyethylene glycol)-aqueous solution of a carrier precursor, and separating, drying and roasting to obtain a NiO-Al2O3 catalyst; then, loading the secondary components La and Ce and precursors of the active auxiliaries to the NiO-Al2O3 catalyst by adopting an incipient-wetness impregnation method; finally, roasting and carrying out reduction activation to obtain the high-temperature-resistant methanation catalyst; the catalyst has high specific surface area, and can reduce carbon deposition reaction and improve the selectivity of methane. The high-temperature-resistant methanation catalyst can maintain relatively high methanation catalytic activity for a long time at high temperatures and can be widely applied to a methanation process under a high-temperature environment.

The invention provides a preparation method of a loaded cobalt catalyst, and relates to a cobalt-containing catalyst. The preparation method includes the steps that a spinel-type oxide CoAl2O4 is prepared through a sol-gel method; then, the oxide is loaded on the surface of sepiolite ore nanofiber through an impregnation method, and a CoAl2O4/sepiolite ore nanofiber composite is obtained; then, the composite is reduced in a reducing atmosphere, and a cobalt/CoAl2O4/sepiolite ore nanofiber composite, namely, the loaded cobalt catalyst formed by the CoAl2O4/sepiolite ore nanofiber composite loaded with cobalt is obtained. The defects of an existing loaded cobalt catalyst that the preparation process is complex, the reaction energy consumption is high, and a product is poor in high-temperature stability and prone to agglomeration at a high temperature are overcome.

The invention discloses a three-roller inclined rolling forming method of rail vehicle axles. The method is characterized in that rods are heated and fed into a three-roller inclined rolling machine through an axial pushing device; three inclined rollers are engaged with the rods at the same time, and drive the rods to rotate; meanwhile, the axial pushing device pushes the rods to axially move ata constant speed; a radial driving mechanism controls radial movement of the inclined rollers according to diameter requirements of rail vehicle axles needing to be machined; when the rods axially move to contact with an axial guide device, the axial guide device tows the rods to continuously move axially at a constant speed; meanwhile, the rods are deviated from the axial pushing device; and after machining is finished, large-diameter long step shafts-rail vehicle axles are obtained. The method has the advantages of simple mold manufacturing, uniform distribution of force on the surfaces of rolled parts, capability of effectively reducing wear of the rollers in the inclined rolling process, capability of realizing light construction of the rolling machine and effective prolonging of the service life of the rolling machine.

The invention discloses a short carbon fiber aluminum based composite material and a preparation method thereof. The preparation method comprises the steps of surface processing, chemical copper plating, mixing, sintering, etc.; the prepared short carbon fiber aluminum based composite material comprises the following components in percentage by mass: 8-10% of copper plating short carbon fibers, and 90-92% of aluminum powder, wherein the length of the copper plating short carbon fibers is 2-3mm, and the diameter is less than 20 microns; the thickness of a copper plating layer is 1 micron; the particle size of the aluminum powder is 20-100 microns; the measurement result shows that the density of the short carbon fiber reinforced aluminum based composite material is 98.5%, the hardness is 92.38Mpa, the tensile strength is 202.05Mpa, and the bending resistance is 376.05Mpa. With the adoption of the method, the technical problem of low dispersity of short carbon fibers in the composite material can be solved; the prepared short carbon fiber aluminum based composite material is outstanding in performances and meets the use demands of special situations.

The invention discloses a preparation method for MnO2/C composite fibres. The preparation method comprises the following steps: dissolving SiO2 in DMF (Dimethyl Formamide) solution, dispersing the SiO2 uniformly by ultrasound, then, adding PVP (Polyvinyl Pyrrolidone) and PAN (Polyacrylonitrile), stirring uniformly to obtain a spinning solution, and performing electrostatic spinning on the spinning solution to obtain SiO2/PAN/PVP mixture fibres; calcining the SiO2/PAN/PVP mixture fibres in a vacuum tube furnace to obtain SiO2/C fibres; soaking the SiO2/C fibres in a NaOH solution of, and washing and drying the soaked SiO2/C fibres to obtain nitrogen-doped porous fibres; adding the nitrogen-doped porous fibres to an acidic KMnO4 solution in an ice bath to obtain MnO2/C composite fibres. The MnO2/C composite fibres prepared by the preparation method have the diameters of 1mm and have high specific capacitance, and serve as a super-capacitor electrode material; SiO2-removed hollow structures are formed in the MnO2/C composite fibres.

A micro-copper-formulated ceramic brake pad is made with aramid pulp, carbon fiber, magnesium hydroxide, copper fiber, brown fused alumina, antimony sulfide, ceramic fiber, superfine iron oxide powder, calcium sulfate whisker, potassium titanate, barite, crystalline flake graphite, calcined petroleum coke, nano hollow float beads, flake aluminum powder, nitrile butadiene rubber powder, cashew nut shell oil modified phenolic resin, zirconite, boron nitride, zinc oxide, and benzoxazine resin. The components are reasonably matched, and advantages of the materials can be given to full play in abrasive materials. The novel fiber materials are reasonably composited, performance defects of the materials can be mutually complemented, and high performance is achieved through mutual connective action. The micro-copper-formulated ceramic brake pad has low content of heavy metals and smaller than 0.5% of copper content and therefore, is very environment friendly.

The invention relates to a preparation method of a carbon-based composite material for a cathode of a lead-carbon battery, which can prepare a carbon-based lead compound composite material with a controllable proportion, wherein the lead compound uniformly distributes on the surface of carbon material and maintains the original structure character of the carbon material. The preparation method isas follows: the carbon material and a lead ion solution are uniformly mixed in a reaction vessel, a precipitant is slowly dropped, the lead ions are completely deposited on the surface of the carbon material, then filtered, washed and dried to obtain a precursor, and the composite material is obtained through high temperature treatment, and mass ratio of lead compounds is between 1% to 90%. The composite material and the active substances of cathode of lead-acid battery can be better combined by the lead oxide particles on the surface, while the cathode capacity of the cathode of the battery prepared by using the composite material additive is obviously increased, the hydrogen evolution of the cathode is reduced, cathode active material utilization rate is also greatly improved, and the cycle life of high-rate charge-discharge of partial charge state of the cathode is significantly prolonged.

The present invention is supersonic electrochemical etching process of preparing porous luminescent silicon material. The traditional porous silicon material preparing electrochemical processes, including DC current process and pulse current process, has some demerits resulting in porous silicon material with imperfect optical characteristics. The supersonic electrochemical etching process of the present invention has optimized etching condition, and can obtain porous silicon material with improved surface interface structure and optical characteristics.

The invention discloses a NiCo2O4 nano flower-like composite material (NiCo2O4-NF). The composite material is a flower-like structural material with loose NiCo2O4 nanosheets uniformly distributed at the surface. A cell assembled by using the composite material as a counter electrode exhibits superior photoelectric conversion performance: under the same conditions, photoelectric conversion efficiency of the dye-sensitized solar cell containing the NiCo2O4-NF counter electrode material is as high as 7.90% and is higher than that of 7.45% of a conventional cell containing commonly-used counter electrode noble metal platinum (Pt); and in addition, the NiCo2O4-NF exhibits better faradaic pseudocapacitance performance when used as an active electrode material: the specific capacitance reaches 817.5 F*g<-1>. The composite material provided by the invention is prepared by the one-step hydrothermal method, and has a simple preparation process, a low price and no pollution, can replace the Pt asa counter electrode to be used in the dye-sensitized solar cell and be used as an excellent active electrode to be used for supercapacitors, and has great application prospects in terms of energy storage.

The invention relates to a production method, which utilizes vertical deposition technology excited by magnetic force mixing to produce polycrystal mercuric iodide thin films and belongs to the technical field of semi-conductor thick film production, wherein the mercuric iodide films are used as seed crystal layers, and high-quality polycrystal mercuric iodide thick films are produced by deposition on the seed crystal layers by of the process of vacuum evaporation and physical vapor phase deposition under the action of ultrasonic wave. The produced polycrystal mercuric iodide thick films are particularly applicable to production of X-ray and Gama-ray polycrystal mercuric iodide thick film detectors. 2,7-di-bromo-4-hydroxyl mercuric fluoresce red di-sodium salt (also called merbromin) and iodine tincture are utilized precursor reaction solution, absolute alcohol is used as solvent, and finally the polycrystal mercuric iodide thin films are produced. The mercuric iodide thin films are used as the seed crystal layers, and the polycrystal mercuric iodide thick films are produced by means of vacuum evaporation and physical vapour phase deposition, and finally, high-quality polycrystal mercuric iodide thick films with columnar grains are obtained on lining substrates.

The present invention relates to a coking depressor for an ethylene cracking furnace, and a method for using the same. The depressor consists of a thiol compound, a quinoline compound, a disalicylic acid compound and an organic solvent. The coking depressor not only overcomes the shortcomings in the prior depressor that the manufacturing cost is high, the injection operation is difficult, the distribution in the cracking furnace tube is uneven, and the depressor erodes the inner wall of the furnace tube, etc., but also effectively prolongs the service life of the cracking furnace and improves the yield of ethylene, the usage of the material and the load of an ethylene device. The producing amount of CO and CO2 is largely reduced, and thus the depressor is safe and environment-friendly.

The invention discloses an Ag/TiO2-N visible-light catalyst. A titanium dioxide crystal form is of a pure anatase phase; a particle size is 2.0 [mu]m to 3.0 [mu]m; and a specific surface area is 140 to 169 m2/g. The invention also discloses a preparation method for the Ag/TiO2-N visible-light catalyst. The method comprises the following steps: (1) preparation of TiO2 nanometer particles; and (2) preparation of the Ag/TiO2-N visible-light catalyst. The invention also provides application of a visible light responding photocatalyst in preparation of a photocatalytic organic-pollutant degradation agent and an antibacterial agent. Compared with the prior art, the invention has the following beneficial effects: raw materials used in the preparation method are simple and easily available; the preparation method is simple, convenient and easily implementable; the prepared micron spherical Ag/TiO2-N visible light responding photocatalyst has the advantages of uniform distribution of Ag nanometer particles on the surface of TiO2, low carrier recombination rate, high photocatalytic activity and good stability; meanwhile, the preparation process does not need any reducing agent, so generation of pollutant by-products is avoided, and cost is reduced.

The invention provides an MXene doping-based composite material and a preparation method thereof, and the preparation method comprises the following steps: taking an MAX phase material as a raw material, and preparing an MXene colloidal solution through etching and stripping; performing centrifuging, washing and ultrasonic resuspension on the MXene colloidal solution for multiple times, then carrying out self-assembly under vacuum filtration, and carrying out vacuum drying on an obtained filter cake to obtain MXene paper; dissolving the MXene paper in an isopropanol solution, adding tetrabutyl titanate, uniformly mixing, dropwise adding a hydrofluoric acid solution, carrying out sealed hydrothermal treatment after dropwise adding, and performing cooling, washing and drying to obtain a target product. According to the MXene doping-based composite material and the preparation method thereof, the preparation process is simple, the requirements on instruments and equipment are low, the recombination efficiency of photon-generated carriers can be effectively improved, and the photocatalytic activity of a TiO2-based composite catalyst is improved.

The invention discloses a preparation method of a polyhydroxy phenyl improved type methanation catalyst. The preparation method comprises the following steps: firstly, adding an ethanol dispersant into aluminum oxide or pseudo-boehmite, and performing ball milling on a ball mill to prepare activated aluminum oxide or pseudo-boehmite microsphere particles; secondly, preparing a nickel nitrate-polyhydroxy phenyl solution by using polyhydroxy phenyl and nickel nitrate, or preparing a nickel nitrate/M nitrate-polyhydroxy phenyl solution by using polyhydroxy phenyl, nickel nitrate and nitrate corresponding to an auxiliary agent M, and dipping to an activated aluminum oxide or pseudo-boehmite microsphere particles carrier; and finally, drying overnight at room temperature, and calcining at a nitrogen atmosphere or air atmosphere to prepare a NiO/Al2O3 catalyst or NiO-M/Al2O3 catalyst. By adopting the preparation method disclosed by the invention, the activity, selectivity and thermal stability of the catalyst are improved.

A chiral medicine resolution medium based on a polypeptide combined recognition base is obtained by bonding the polypeptide combined base with different chiral recognition capabilities onto the surface of porous silica gel with its pore size being 8-12nm and particle size being 5-30mm through chemical modification. According to a preparation method of the above chiral medicine resolution medium, one or some medicine-related proteins undergo enzymatic hydrolysis at 25-37 DEG C by the use of trypsin or papain or elastase or one or some enzymes thereof; zymoprotein is removed from the polypeptide combined base obtained after enzymatic hydrolysis by denaturation and adsorption or dialysis, and then the polypeptide combined base is bonded onto the porous silica gel surface by chemical modification so as to obtain the required chiral medicine resolution medium. The prepared chiral medicine resolution medium has wide chiral resolution range and uniform surface distribution, and its bonding density is higher than the bonding density of a protein stationary phase. The chiral medicine resolution medium has the combined chiral recognition base which can be used for resolution and analysis of a plurality of chiral medicines and provides a foundation for developing chiral resolution materials with a wider resolution range and chiral medicines with better specificity.

The invention relates to a preparation method of polypyrrole modified activated carbon. The method comprises the following steps: (1) selecting coconut shell/fruit shell granular activated carbon, washing and drying to constant weight, and carrying out vacuum drying and storage for later use; (2) preparing a pyrrole solution; (3) attaching pyrrole to the activated carbon; (4) adding ferric trichloride hexahydrate; (5) adding benzene sulfonic acid sodium salt; (6) cleaning and drying an obtained modified activated carbon in vacuum; (7) sealing with nitrogen, drying and storing. According to thepreparation method, organic anions ( benzene sulfonic acid sodium salt (BSNa)) are doped, so that laminar growth has a compact and ordered surface form and is highly doped in polypyrrole; the PPy film doped with aromatic sulfonate anions (benzene sulfonic acid sodium salt) has higher degree of order, crystallinity and conductivity, so that the pyrrole film has better stability in an alkaline solution; the ferric trichloride hexahydrate doped polypyrrole modified activated carbon is doped with the surfactant (benzene sulfonic acid sodium salt) at the same time, so that the surface charge distribution is more uniform, and the conductivity is stronger.