110results about How to "No apparent reunion" patented technology

The invention provides a method for preparing molybdenum disulfide nanosheets by ultrasonic-assisted chemical intercalation and belongs to the field of preparation of molybdenum disulfide nanosheets. The method provided by the invention comprises the following steps: performing ultrasonic reaction on molybdenum disulfide powder and n-butyl lithium under the protection of high-purity argon gas to obtain lithium-intercalated molybdenum disulfide; and adding ultra-pure water into a reactant, performing chemical stripping on a molybdenum disulfide bulk material to obtain single-layer molybdenum disulfide nanosheets, adding anhydrous ethanol for washing, and performing ultra-pure water dispersion and high-speed centrifugal separation so as to obtain a single-layer molybdenum disulfide nanosheet material which can be dispersed in water. Compared with the traditional method for preparing the molybdenum disulfide nanosheets by chemical intercalation, the method for preparing the molybdenum disulfide nanosheets, provided by the invention, has the characteristics of high reaction speed, high reaction yield, good stripping effect, simple operation, mild reaction conditions and easiness in large-scale production.

The invention discloses a method for preparing two-dimensional silver nanosheets of different shapes. Firstly, a silver mirror reaction is adopted, glucose serves as a reducing agent, a quantitative silver-ammonia solution and the quantitative glucose solution are sequentially added into a beaker to be mixed, then cetyl trimethyl ammonium bromide serves as a surface active agent, the cetyl trimethyl ammonium bromide solution is added into the mixed solution, then high-temperature reaction is carried out on the mixed solution, and a solution of the two-dimensional silver nanosheets of the different shapes is prepared by adjusting the concentration ratio of the cetyl trimethyl ammonium bromide solution and the silver-ammonia solution. The method has the advantages that operation is easy, cost is low, equipment is simple, and the prepared silver nanosheets are uniform in grain size, good in water solubility and free of obvious gathering.

The invention discloses a flower type Ni<3>S<2>/graphene three-dimensional composite electrode material and a preparation method thereof. In the flower type Ni<3>S<2>/graphene three-dimensional composite electrode material, graphene is taken as a substrate, and flower type Ni<3>S<2> particles are uniformly grown on the surface of the graphene. The preparation method of the flower type Ni<3>S<2>/graphene three-dimensional composite electrode material comprises the following steps of uniformly dispersing the graphene, thiourea, nickel acetate tetrahydrate and a three-block polymer F127 in distilled water with ultrasound; carrying out hydrothermal reaction on the obtained solution at 160-200 DEG C; dialyzing the gel-like mixture in the distilled water and then drying the gel-like mixture; and calcining the obtained gel-like solid at a controlled temperature of 750-850 DEG C under the protection of N2, thereby obtaining the black gel-like flower type Ni<3>S<2>/graphene three-dimensional composite electrode material which has high specific capacitance, charging and discharging stability, favorable conductivity and large specific surface area. The flower type Ni<3>S<2>/graphene three-dimensional composite electrode material can be used as an electrode material of a supercapacitor, and the preparation process is simple, and is convenience in operation and high in repeatability.

The invention relates to a silicon/carbon composite material and a preparation method thereof, and belongs to the technical field of electrode materials. In the process, the silicon/carbon composite material is obtained by performing metal thermal reduction of a low temperature binary molten salt system on the silica/carbon precursor, and drying the processed precursor after pickling and removal of impurities. The silicon/carbon composite material has a shape similar to that of the precursor and has a hollow structure inside. Compared with the prior art, the invention has the advantages that the molten salt system is used as the reaction system, and aluminum powder, magnesium powder or zinc powder is used as the reducing agent to make the reactant contact more uniform, the reaction temperature lower and the reaction yield higher, and to remain the appearance of the obtained product intact; the prepared silicon/carbon composite material exhibits excellent electrochemical performance asa negative electrode material for lithium ion batteries; the preparation method is simple in process, green and environmentally friendly, and convenient for large-scale production; the raw materials are rich in content in nature and can be expanded to prepare a wide variety of nanoparticles, which has wide application value.

The invention discloses a method for preparing sub-micrometer lithium iron phosphate (LiFePO4). The method comprises the following steps of: mixing an iron source, a lithium source, a phosphorous source and a doping ion-containing compound according to a molar ratio of (lithium + doping ions) to iron to phosphorus of 1:1:1, or a molar ratio of lithium to (iron + doping ions) to phosphorus of 1:1:1, and then adding the mixture into an organic solvent, wherein the mole ratio of the doping ions to the phosphorus is 0.01-0.15:1, and the solid-to-liquid ratio after the reaction generates a precipitate is 1:10-1:2; reacting at a constant temperature of between 190 and 320 DEG C under the normal temperature to prepare a LiFePO4 material of which the particle diameter is 0.1 to 0.9 mu m; mixing the LiFePO4 powder material and an organic carbon source; after ball milling and uniform mixing, putting the mixture into a calcining furnace and heating the mixture under the protection of an inert gas and maintaining the temperature; and cooling the mixture to the room temperature to obtain a LiFePO4/C cathode material of which the surface is wrapped with carbon and the particle diameter is 0.1 to 0.9 mu m. In the method of the invention, normal-pressure equipment can be used, and energy consumption is saved and the cost is low.

The invention provides a method for preparing zinc oxide nanometer hollow spheres in caustic corrosion reaction. The method is mainly characterized in including using the solution of Zn(Ac)2 as the initial reactant first, adjusting the pH value to 11.5-14 by adding ammonia, using ethanol as the solvent, finally forming the nanometer hollow spheres in the hydrothermal reaction between Zn(NH3)4<2+> and excessive ammonia at a high temperature. The entire reaction has simple material, easy operation, no need for any complex instrument processing, convenience and rapidness, which is a method of rapidly preparing the zinc oxide nanometer hollow spheres. The obtained hollow spheres have narrow size distribution and good dispersibility with an external diameter of 600 nm and an internal diameter of 200-300 nm. The caustic corrosion reaction is adopted to synthesize zinc oxide nanometer hollow spheres in the method, thus agglomeration phenomenon caused by an aging machine is obviated, complex operation steps of organic reaction synthesis, contamination and disturbance to objective material zinc oxide caused by the complex operation steps are obviated. The method is obviously characterized in high production rate, rapidness, easiness, convenient operation, low cost and environment friendliness.

The invention discloses an LED fluorescent glue that improves the uniformity of light emission. In parts by weight, the fluorescent glue consists of 1 part of packaging glue, 0.01-1 part of fluorescent powder, 0.01-0.1 part of silica-based inorganic nanoparticles, 0.01 part of ‑1 part silicone granules. Inorganic nanomaterials and silicone particles are mixed in the encapsulation glue, which reduces the sedimentation rate of the phosphor in the encapsulation glue, improves the uniformity of the phosphor distribution in the colloid, makes the white light spot more uniform, and improves the light diffusivity and transmittance. The light rate is maximized, and by changing the propagation path of the light, the light of various wavelengths is more fully mixed, and the spatial color uniformity of the light is further improved. It also provides an LED packaging method and LED that improve the uniformity of light emission, which improves the consistency of products, reduces the probability of uneven color distribution in space due to uneven distribution of phosphor powder, and improves product yield and product production. efficiency.

The invention discloses a method for preparing a water-soluble ferroferric oxide nano particle, relates to a nano particle, and provides the ferroferric oxide nano particle which has the grain diameter of less than 4 nm and narrow particle diameter distribution. The method for preparing the water-soluble ferroferric oxide nano particle of a typical monodisperse particle is provided. The method comprises the steps as follows: 1), anhydrous ferric chloride and trisodium citrate are immersed in diethylene glycol and heated until the anhydrous ferric chloride and the trisodium citrate are dissolved completely; 2), anhydrous sodium acetate is added into a mixed solution obtained in the step 1), and the mixed solution is waited to be dissolved completely; 3), the mixed solution obtained in the step 2) is placed into a reaction still, the reaction still is closed, and after the reaction, the mixed solution is naturally cooled to the room temperature; and 4), the ferroferric oxide nano particle is separated from the reaction solution prepared in the step 3) by a magnet, the particle is washed and dried, so that the monodisperse water-soluble ferroferric oxide nano particle is obtained.

The invention relates to a preparation method of nanometer grade spherical aluminum oxide, and belongs to the technical field of aluminum oxide processing. The preparation method of the nanometer grade spherical aluminum oxide comprises the following steps of (1) uniformly mixing soluble aluminum salt, ammonium citrate, water and ethanol; then, performing solvothermal reaction at 150 to 200 DEG Cfor 15 to 24h; next, performing cooling and filtering to obtain a product; drying the product to obtain a precursor; (2) performing heat insulation on the precursor obtained in the step (1) at 400 to600 DEG C for 2 to 7 hours to obtain a finished product. The preparation method of the nanometer grade spherical aluminum oxide breaks through the limitation of the spherical aluminum oxide preparation from basic substances such as urea, ammonium hydroxide and sodium hydroxide in the prior art. The aluminum oxide obtained by the method has a regular appearance, does not have the obvious agglomeration, has a fine and small particle dimension, reaches the nanometer grade and has good application prospects.

This invention relates to a sol-gel method for preparing nanoscale white carbon black from fly ashes, NaF and concentrated H2SO4. The method comprises: (1) dissolving fly ashes in HNO3, and sintering at a high temperature to obtain SiO2; (2) dropping concentrated H2SO4 onto SiO2 and SiF4 to generate SiF4 gas, introducing SiF4 gas into solution of sodium dodecyl sulfate, Sodium dodecyl sulfonate and cetyltrimethyl ammonium bromide, hydrolyzing to obtain sol and then gel, and calcining to obtain nanoscale white carbon black. The obtained nanoscale white carbon black has diameters of about 20nm, and a specific surface area of 58-631 m2/g. Besides, the nanoscale white carbon black is semi-transparent white, and has such advantages as high purity, no obvious aggregation, high dispersibility and high activity. The method has such advantages as mild reaction conditions, easy control of the techniques and simple process.

The invention discloses a making method of nanometer crystal TiO2 in the optical battery, which is characterized by the following: adopting butyl titanate as predecessor; adding certain quantity of hydramine alkyl or alkylolamides alkyl into alcohol solution as stabilizer; stirring vigorously; dripping small quantity of pure water; forming transparent sol; forming even TiO2 sol through dispersing sol; refluxing; evaporating residual organics; obtaining 1% transparent solution with grain size of TiO2 particle less than 10nm; adopting anatase phase as main phase; making the particle in the solution not gather due to stabilizer and repulsion load and spatial steric hindrance effect; obtaining the even sol solution with density at 10-20% after rotating and evaporating the transparent solution. The method possesses cheap cost, simple technique, stable quality and friendly environment, which is fit for making silk screen and nanometer crystal TiO2 in the optical battery.

The invention discloses a preparation method of a Pd-M nano composite catalyst loaded with reduced graphene oxide (RGO), and belongs to the technical field of catalyst preparation. The preparation method comprises the following steps: firstly, preparing graphene oxide (GO) by utilizing an improved Hummer method; performing ultrasonic dispersion on GO by utilizing ultra-pure water to obtain a GO suspension, adding salt solutions of Na2PdCl4 and M to the suspension, performing ultrasonic treatment to enable metal precursors to be uniformly dispersed between GO nano sheet layers, then adding PEG(polyethylene glycol), and performing uniform mixing to obtain a final mixed solution; dropwise adding a sodium borohydride solution into the final mixed solution, performing standing reduction for 0.5h, and performing stirring to enable PdM metal particles to be uniformly loaded on the RGO; and finally, performing cleaning with a mixed solution of ultra-pure water and absolute ethanol, and performing vacuum suction filtration and freeze drying to obtain a PdM/RGO nano composite catalytic material. The PdM/RGO nano catalyst prepared by the method has uniform dispersity and large specific surface area, thereby improving the catalytic activity and stability; and the method is simple in technological process and high in feasibility.

The invention provides a preparation method of an aqueous polyurethane coating with modified kaolin as a filler. The preparation method comprises (1) dispersing 8-12g of uncalcined kaolin and 0.12-0.15g of a titanate coupling agent in 15-20ml of anhydrous ethanol, grinding the dispersion for 30-60 minutes, carrying out drying and recovering ethanol so that hydrophilic modified kaolin is obtained, (2) mixing 78-85g of aqueous polyurethane, 15-21g of modified kaolin, 0.5g of a defoaming agent and 0.5-1.5g of a thickening agent and carrying out ball milling dispersion for 30-60min to obtain the aqueous polyurethane coating with modified kaolin as a filler. The modified kaolin has a suspension rate of 85-92% in water. The preparation method has the advantages of use of the cheap filler, simple ball milling process, low energy consumption and environmental protection. By adding a high amount of hydrophilic modified kaolin to the aqueous polyurethane coating, the comprehensive performances of the coating is obviously improved. The aqueous polyurethane coating film is hard and strong in an adhesive force and has good water resistance and weatherability.

The invention relates to a macroscopic quantity preparation method for a macromolecule-based silver-loaded composite nanofiber membrane. The method comprises the steps of a spinning solution preparation step, an electrostatic spinning step and precursor reduction. According to the prepared macromolecule-based silver-loaded composite nanofiber membrane, the sizes of silver nanoparticles are stable, obvious agglomeration does not exist, and the distribution is even; the macromolecule-based silver-loaded composite nanofiber membrane has the advantages that the fiber length-diameter ratio is big, and the specific surface area is higher; therefore, the contact ratio of nano-silver and noxious bacteria in fiber is greatly increased, and the antibacterial effect of the nano-silver can be exerted to the maximum extent.

The invention discloses carbon-coated magneto-rheological fluid, which comprises magnetic particles, carrier liquid, a surfactant, a thixotropic agent, an antioxidant, a solid lubricant and a dispersant, wherein the magneto-rheological fluid comprises the following materials in percentage by mass respectively: 20 to 80 percent of the magnetic particles, 15 to 45 percent of the carrier liquid, 1 to 3 percent of the surfactant, 0.5 to 2 percent of the thixotropic agent, 0.5 to 2 percent of the antioxidant, 1 to 3 percent of the solid lubricant and 1 to 3 percent of the dispersant. The mass of the carbon-coated magneto-rheological fluid is very light; under the condition without a magnetic field, after standing for half a year, the carbon-coated magneto-rheological fluid has the settling amount not higher than 3 percent and has very high stability and mechanical properties; and an acid corrosion test proves that the carbon-coated magneto-rheological fluid has very strong inoxidability. Simultaneously, the shearing yield strength is not obviously reduced, and the null field viscosity index is obviously improved. The result of electron microscope scanning shows that the carbon-coated particles have better dispersity.

The invention provides a process for preparing nano single-phase powder of Yb3Al5O12 with perfect dispersibility, which is characterized by employing high-purity commercial aluminum nitrate and ytterbium oxide as raw material, initially dissolving ytterbium oxide into concentrated nitric acid to formulate solution with certain concentration, then adding aluminum nitrate solution according to ytterbium-aluminum ratio of 3:5 to obtain mother liquor, and then adding deionized water to enable the aluminum ion concentration of the mother liquor to be 0.1-1mol/L. Carbamide is taken as precipitating agent, the mole ratio of Carbamide and metal salt ions is controlled between 5:1 and 30:1, and the temperature and time are controlled to enable ytterbium and aluminum ions to completely deposit to obtain sediment. Amorphous precursor is calcined to directly crystallize into single phase of Yb3Al5O12 of 20-30nm at a temperature of 900 DEG C and a spot of hydroxypropyl cellulose (HPC) or (NH4)2SO4 is added in the reaction system as dispersing agent, which can enable the grain fineness distribution and sintering property of Yb3Al5O12 to be remarkably improved, and shortage that powers prepared by wet method are easy in agglomerating, hard in washing, large grain size and the like can be effectively resolved.

The invention belongs to the technical field of metal solid catalysts, and particularly discloses a carbon-nitrogen material loaded nickel catalyst with adjustable mesoporous aperture as well as a preparation method and application of the carbon-nitrogen material loaded nickel catalyst. A hydrothermal synthesis process is adopted to pretreat a carbon source precursor and a template agent, and thetemplate agent is well doped into a carbon carrier through a self-assembly process. The synthesized nickel-based composite nitrogen-doped carbon material nano-catalyst carrier has the advantages of adjustable pore size, small metal particles, large specific surface area, uniform dispersion and no obvious agglomeration. Lignin can be efficiently depolymerized to prepare a single-benzene-ring compound, the selectivity to propyl syringol and propyl guaiacol is high, the cycling stability of the catalyst is high, and the yield of monophenol reaches 28.21%.

The invention discloses a heat conduction transparent modification process of epoxy resin for LED packaging. According to the process, a precipitate conversion method is adopted, brine and sodium carbonate are taken as raw materials, polyving alcohol (PVA) is taken as a modifier, and nano magnesium oxide particles with relatively good dispersity can be prepared. As nano magnesium oxide MgO (magnesium oxide) is taken as packing which is added into an epoxy resin AB adhesive curing system, the heat conduction property of a cured article can be improved. After PVA is added in the process, the experiment shows that the prepared nano magnesium oxide MgO particles are free of conspicuous agglomeration and relatively good in dispersity, and as the particles are sphere-shaped, the heat conduction property of epoxy resin is improved, and the light permeability of an epoxy resin cured article can be improved.

The invention discloses a three-dimensional rice-shaped TiO<2>/graphene composite hydrogel and a preparation method therefor. Namely, a simple and environment-friendly one-step hydrothermal method is adopted; GO and TBT are used as the raw materials; sodium citrate is used as the structure-guiding agent; and water and ethyl alcohol are used as the solvent for synthesis. The prepared hydrogel is creative in structure; the macroscopic appearance of the hydrogen is black column-like material; the hydrogel is about 1-2cm in diameter and about 1-2cm in height; the TiO<2> nanoparticles with rice-shaped microstructure is loaded to a graphene sheet, wherein the TiO<2> nanoparticles are about 15-35nm in diameter and about 30-70nm in length; and the TiO<2> nanoparticles and the graphene sheet are woven mutually to form a net-shaped structure. The appearance and the property of the TiO<2>/graphene composite hydrogel are controllable; namely, the forming property and the stability of the gel can be controlled by regulating and controlling the additive amount of TBT and the hydrothermal time; and meanwhile, the composite hydrogel has the inherent attributes of the TiO<2> nanoparticles and the graphene, and a creative synergistic effect also can be generated as well.

The invention provides a flame-retardant high-polymer composite material. The material is characterized by being prepared from an environment-friendly brominated flame retardant, graphene nano-platelets and an auxiliary dispersant, wherein the high-polymer material is polystyrene. The graphene nano-platelets are creatively added into the flame-retardant material and the adding mount is accurately limited; the graphene nano-platelets belong to condensed-phase flame retarding and a network structure is mainly formed in a combustion process, so that the material represents a solid-like behavior in a combustion process; the network structure can effectively inhibit thermal motion of a polymer molecular chain and the exchange of gas and heat is stopped. In view of the flame-retardant effect, only a few of graphene nano-platelets are added and the heat releasing speed and the smoke density of a polymer can be remarkably reduced; unpredicted technical effects are realized.