111results about How to "Good crystallization" patented technology

A process for preparing the cubic silver nanocrystals includes such steps as proportionally dissolving surfactant and silver nitrate in organic solvent while stirring, slowly adding to an organic solvent at 150-180 deg.C to obtain the saturated solution of Ag nanoparticles, continuous reacting, and slow cooling while stirring to obtain the sol of cubic silver nanocrystals. Its advantage is high purity and dispersity.

The invention relates to a preparation technology of a battery anode material and a related automobile battery and particularly discloses a preparation method of lithium ion battery anode material lithium manganate. The method comprises the following steps: using lithium source, Mn3O4 and nanoscale doping metal additive as raw materials for proportioning, then presintering Mn3O4 or the Mn3O4 processed by ball milling, mixing the presintered Mn3O4 with the mixture of lithium source and metal additive; performing the first sintering and second sintering to the mixed raw material; and finally classifying and screening the sintering product to obtain the spinel lithium manganate product with the required grain size. The invention also discloses an automobile lithium ion battery which is assembled by using the spinel lithium manganate prepared by the method of the invention as anode and using graphite as cathode. The preparation method of the invention has simple operation and environmental friend; and the prepared lithium manganate product has excellent product performance.

A multiple elements doped anatase-type TiO2 sol photocatalyst features that its solvent is water or the mixture of water and unitary or binary alcohol, and its sol contains non-metal doped anatase-type TiO2 nanoparticles, and has a formula: TiO2-x-yAxBy, where x=0.0-0.1, y=0.0-0.1 and A or B is one or more of non-metal halogens or N-family elements. Its preparing process includes such steps as hydrolyzing organic or inorganic Ti source, doping, dispergating, and hydrothermal crystallizing.

The invention discloses a preparation method of a graphene supported ferriferrous oxide nanocomposite, comprising the following steps: preparing a precursor by deposition precipitation method, depositing ferric nitrate ninehydrate or ferric chloride hexahydrate on graphene in the form of iron hydroxide by using sodium hydroxide or ammonia to obtain black powder, washing and drying the obtained black powder, grinding the dried black powder, then calcining under the protection of argon, and then cooling, and reducing under the protection of a mixed gas of argon and hydrogen or argon and ammonia gas to obtain the graphene supported ferriferrous oxide nanocomposite. The preparation method is simple and stable. In the obtained composite, ferriferrous oxide is uniformly distributed on graphene and has good interface combination of the substrate graphene, thus the absorbing properties and the like of the composite as a functional material can be improved. The method also can be used for preparing carbon material supported ferriferrous oxide nanocomposites with different substrates by using carbon nanotube, graphite oxide and other carbon materials as the substrate.

The invention discloses a preparation method of carbon-coated cobalt metal nano-particles, which relates to a gaseous compound decomposition-based chemical plating by which reaction product of surface material is not preserved in a plating layer and only carbon is deposited, and is a method for decomposing ethyne and synthesizing carbon-coated cobalt metal nano-particles on potassium chloride carrier by means of chemical vapor deposition. The preparation method comprises the following steps: firstly, preparing cobalt-potassium chloride catalyst, then, synthesizing carbon-coated cobalt metal nano-particles, and finally, performing purification to obtain the carbon-coated cobalt metal nano-particles with purity of 95-99%. The preparation method overcomes the defects that the carbon-coated metal nano-particles synthesized by the existing technology have low purity, poor performance and low yield, and contains overmuch impurities, and the impurities are not easy to remove.

The invention discloses a method for preparing flame retardant epoxy resin from modified graphene, and relates to a method for preparing epoxy resin. The method comprises preparation of graphene oxide; preparation of octa-aminopropyl cage-like silsesquioxane; and modifying of epoxy resin with functionalized graphene, to be more specific, heating and melting the epoxy resin, mixing and curing the epoxy resin and the functionalized graphene to obtain modified epoxy resin. According to the method, the graphene oxide (GO) is prepared by modifying, silane coupling agent KH-550 is used as a raw material for preparation of the octa-aminopropyl cage-like silsesquioxane (ApPOSS), the modified graphene is prepared by grafting reaction of the GO and the ApPOSS, the modified graphene and EP are mixedand cured to improve the compatibility of the modified graphene with the epoxy resin, the modified graphene and the epoxy resin are compounded for preparation of an epoxy resin nanocomposite, and thecomprehensive effect is obvious.

The invention relates to a high-strength electric-control solid propellant which comprises the following components in percentage by mass: 10-20% of adhesive, 60-80% of main oxidizer, 5-20% of auxiliary oxidizer, 1-2% of crosslinking agent, 0.1-0.5% of coupling agent and 1-5% of fuel additive. The adhesive is water-soluble polyvinyl alcohol (PVA); the main oxidizer is hydroxylammonium nitrate (HAN); the auxiliary oxidizer is one or combination of ammonium nitrate (AN) and ammonium perchlorate (AP); the crosslinking agent is one or combination of boric acid and borax; the coupling agent is a silane coupling agent; and the fuel additive is one or combination of cyclodextrin, sodium alginate, polyvinylpyrrolidone (PVP) and gelatin. The normal-temperature tensile strength of the electric-control solid propellant can be obviously enhanced, and the maximum normal-temperature strength can reach 8 MPa or above. The electric-control solid propellant is suitable to be used as an attitude control or orbit control propellant with higher requirements for normal-temperature strength.

The invention provides aerated concrete prepared from coal ash-nanosilicon dioxide-silica fume as main siliceous materials. The aerated concrete comprises at least the following ingredients by weight: 80-150 parts of cement, 180-270 parts of lime, 15-25 parts of gypsum, 550-650 parts of coal ash, 30-45 parts of nanosilicon dioxide, 35-50 parts of silica fume, 30-40 parts of solid water reducers, 1.5-3 parts of retarders, 1.0-1.5 parts of foaming agents, 1.2-1.7 parts of foam stabilizers, 2.1-3.0 parts of water glass, 1.6-2.5 parts of oleic acid-triethanolamine binary mixed solutions and 400-500 parts of water. According to the invention, the aerated concrete is low in cost and simple in preparation technology, and improves the crystalline degree and crystalline quantity of an aerated concrete hydration product tobermorite, so that the thermal insulation property and strength of the aerated concrete are improved.

The invention relates to a method for preparing a composite heterostructure of zinc oxide nano rods and a silver micron plate. The method includes: utilizing dextran sulphate sodium as regulating agent to prepare a perforated silver micron plate in a reaction system of silver nitrate and an ascorbic acid solution of water and methanamide; depositing zinc oxide seed crystals on the silver micron plate, coating the silver micron plate with the deposition of the zinc oxide seed crystals on an electric-conducting glass sheet in a rotating manner, cleaning, drying, placing the electric-conducting glass sheet in an ethanol solution of hexamethylene tetramine and zinc nitrate to grow a zinc oxide nano rod array on the silver micron plate, fully cleaning with water, and naturally drying to obtain the finished product. The product prepared by the method is a high-level composite heterostructure with the zinc oxide nano rod array growing on the perforated silver micron plate, wherein the diameter of the silver micron plate is about 4 microns, and the size and the structure of the zinc oxide nano rod array are adjustable and controller. The method for preparing the composite heterostructure of the zinc oxide nano rods and the silver micron plate is structurally controllable, good in repeatability and stable in product property, and has excellent photocatalytic performance.

The invention relates to the field of semiconductor yield improvement, in particular to a crystal edge cleaning device. According to the crystal edge cleaning device, the front face and the back face of the crystal edge of a wafer can be processed at the same time, residual film structures and various impurities on the crystal edge can be effectively removed, meanwhile, the crystalline degree of the crystal edge can be improved, then, the probability that the crystal edge is the defect source is reduced, and great help is provided for improving the product yield.

The present invention discloses chemical preparation process of nanometer polyethylene thienyl dioxide, and belongs to the field of conducting material preparing technology. The preparation process includes the following steps: compounding 0.5-1.2 mol/L concentration mixed solution of camphor sulfonic acid and ethylene thienyl dioxide, compounding 0.47-2.80 mol/L concentration solution of ferric trichloride, mixing them to initiate polymerization reaction at 0-5 deg.c; centrifugally separating and washing the product with deionized water to neutral, vacuum drying at 50-80 deg.c for 6-24 hr to obtain the navy blue polyethylene thienyl dioxide powder as the product. The preparation process is simple and environment friendly, and the prepared nanometer polyethylene thienyl dioxide has high conductivity, high crystallization degree and other physical characteristics, and possesses latent application in photoelectronic device field.

The invention discloses a method for preparing a comb-shaped macromolecular solid-solid phase change material. The method comprises the following processes of: adding at least one of macromolecular compounds containing hydroxy, amino or carboxyl into a dispersion liquid to form a uniformly dispersed suspension, heating the suspension to the temperature between 50 DEG C and 95 DEG C to react at the stirring speed of 50-400r/min, adding a catalyst or an initiator in an amount which is 0.1-2 percent of the mass of the macromolecular compound, then adding (methyl) acrylic n-alkyl ester in an amount which is 30-300 percent of the mass of the macromolecular compound, reacting for 6-24 h at the same stirring speed, washing the obtained reaction product for three times with deionized water and anorganic solvent respectively, and drying the reaction product to obtain the comb-shaped macromolecular solid-solid phase change material. The dispersion liquid is water, formic acid, acetic acid, methanol or ethanol; and the organic solvent is capable of dissolving the (methyl) acrylic n-alkyl ester and poly (methyl) acrylic n-alkyl ester.

The invention discloses a preparation method of a titanium-based PbO2 anode with a conductive ceramic membrane intermediate layer based on in-situ thermal reaction. The method comprises the followingsteps (1), a titanium material is anodized; (2), a Ti4O7-TiN ceramic membrane is prepared by high temperature thermal reaction under hydrogen atmosphere; and (3), a beta-PbO2 active layer is electrodeposited on an anodic, and finally a Ti/Ti4O7-TiN/PbO2 coating anode is prepared. According to the method, the titanium dioxide-titanium nitride composite ceramic membrane with good conductivity, highcorrosion resistance and high strength (hardness) is obtained by utilizing electrochemical anodic oxidation and in-situ high-temperature thermal reduction, the composite ceramic membrane serves as a bottom layer to prepare the Ti/Ti4O7-TiN/PbO2 coating anode through anodic electrodeposition, and a novel titanium-based PbO2 coating anode with long service life and low energy consumption is finallyobtained; and moreover, the good conductivity of an electrode enables cell voltage in the electrochemical preparation and electrolysis processes of the electrode to be remarkably reduced, and the electric energy consumption can be saved.

The invention relates to a method for preparing trihydroxy cobalt hydroxide, which comprises the following steps of: adding an appropriate amount of cobalt chloride and hexadecyl trimethyl ammonium chloride into mixed liquor of N,N-dimethylformamide and deionized water, and slightly stirring to form red uniform solution; adding 30 weight percent of hydrogen peroxide, fully mixing, screwing a reaction kettle, putting into a drying box, and standing at the temperature of 150 DEG C; and performing centrifugal separation on a product, and washing for multiple times to obtain the product. Comparedwith the prior art, the method has the advantages that: a new type of trihydroxy cobalt hydroxide is synthesized by a hydrothermal method, is well crystallized, and has controllable size and structure, high purity and definite components; the preparation method is simple and practicable, and high in operability and repeatability; and the powdered product has stable performance, can be stored in air at room temperature for a long time, and can be widely used for the fields of energy batteries, catalysis, electrochemistry, gas sensors, magnetics and the like.

The invention discloses a method for preparing Al2O3 composite powder with uniformly dispersed carbon nanotubes by an in-situ synthesis process, which comprises the following steps: proportionally preparing aluminum nitrate, nickelous nitrate and citric acid into a solution, and heating and calcining the obtained solution to initiate the combustion reaction, thereby obtaining the NiAlxO3x+1 solid solution catalyst precursor powder; and putting the obtained solid solution in a pipe furnace, introducing a gas mixture containing methane, hydrogen and nitrogen, heating to reaction temperature, reacting for some time, and cooling to obtain the Al2O3 composite powder with uniformly dispersed carbon nanotubes. The content of the catalyst nickel is controlled to control the content of the carbon nanotubes; and meanwhile, the invention solves the problem that the carbon nanotubes can not be easily dispersed in the ceramic matrix, so that the nanotubes are uniformly dispersed in the product.