99 results about "Perfect crystal" patented technology

The invention discloses a machine-like stripping device for ton-scale production of graphene and a production method of the machine-like stripping device. The machine-like stripping device is characterized by comprising one or more stages of stripping devices which are connected in series, wherein each stripping device comprises a material bin, a rotor, a material distribution bin and the like, the lower part of the rotor is matched with that of the material bin, and when the rotor rotates, relative friction is formed at the matching position between the outer surface of the rotor and the inner surface of the material bin. During use, graphite raw material receives the shearing action of a friction force at the matching position, and Van der Waals forces among graphite layers of the graphite collapse so that the graphite is stripped and thinned into graphene which is fed into the material distribution bin. The machine-like stripping device for ton-scale production of graphene is simple to operate and can realize batch production of graphene, and the obtained graphene has a perfect crystal structure, a large specific surface area and good conductivity.

A process for preparing perovskite-type compound A_x(BO₃)_y powders involving reacting a solution containing A and a solution containing B, or a combined solution comprising A and B, with an alkaline solution in a high-gravity reactor at a temperature ranging from about 60° C. to about 100° C. A is one or more metal elements selected from the group consisting of Li, Na, K, Mg, Ca, Sr, Ba, Pb, Sm, La, Nd, Bi, and other rare-earth metal elements. B is one or more metal elements selected from the group consisting of Ti, Zr, Sn, Hf, Nb, Ce, Al, Zn, Mn, Co, Ni, Fe, Cr, Y, Sc, W, Ta, and the like. The resulting mixture is then filtered, rinsed and dried to obtain the desired powders. The obtained perovskite-type compound A_x(BO₃)y powders have a small average particle size with a narrow particle size distribution, a perfect crystal form and a uniform particle shape, and is suitable for use as raw material for making dielectric, piezoelectric, anti-ferroelectric, pyroelectric, pressure-resisting, sensing, microwave media, and other ceramics.

The invention relates to a high-density spherical ferric phosphate and a preparation method thereof, and preparation materials are mainly used for preparing ferrous phosphate lithium which is the anode material of a lithium ion battery. The preparation method takes an iron source and an additive as raw materials, and the raw materials are dissolved by vaal water to be made into a mixed solution A; the preparation method takes phosphate and a neutralizing agent as raw materials, and the raw materials are dissolved by the vaal water to be made into a mixed solution B. The solution A and the solution B are mixed and reacted, preparation materials are washed and parched, and the high-density spherical ferric phosphate the average grain diameter of which is 1.5-5micron, the tap density is not less than 0.95g/cm<3>, the grains are dispersed and the sizes are symmetrical is obtained. The ferrous phosphate lithium prepared by the high-density spherical ferric phosphate has perfect crystal structure, lithium ion intercalation/de-intercalation channel is normal, and the discharge capacity can reach 140mAh/g under the condition of 1C. The preparation method has simple process and is easy to technologize, and the ferrous phosphate lithium synthetized by the ferric phosphate has good crystallinity and crystal structure and can increase the electrochemical properties of the ferrous phosphate lithium.

The invention discloses a Prussian blue positive electrode material and a sodium ion battery. The preparation method comprises that the salt solution of M creeps to the mixed solution of Na4Fe(CN)6 and a sodium salt, the obtained solution is heated in a protective atmosphere to obtain a Prussian blue intermediate, the intermediate solution is transferred into a high-pressure reaction kettle, and a heating reaction is performed at a certain temperature to obtain the Prussian blue positive electrode material, or the intermediate solution is subjected to high-temperature spray drying to obtain the Prussian blue material powder. According to the present invention, through the high-temperature and normal pressure reaction and the high-pressure and high-pressure heating reaction, the prepared material has advantages of perfect crystal structure, less defect and low water content, and can improve the specific capacity and the stability of the battery in the application as the sodium ion battery positive electrode material; and the preparation method is simple, and is suitable for continuous large-scale production.

The invention belongs to the technical field of a lithium ion battery conductive agent, and relates to a preparation method of graphene/carbon nanotube composite conductive paste. The preparation method comprises the following steps of S1, dispersing a dispersing agent in a solvent, adding and uniformly stirring carbon nanotubes, and performing initial grinding and dispersing to form a carbon nanotube dispersion liquid A; S2, dispersing the dispersing agent in the solvent, adding graphene, and performing per-dispersion processing, namely, mechanical stirring is performed until uniform stirring is achieved, and cutting and dispersing are performed by a high-speed cutting machine to form a graphite dispersion liquid B; and S3, clashing two stands of high-voltage liquids of the carbon nanotube dispersion liquid A and the graphite dispersion liquid B in clash equipment in a coaxial opposite runner, namely, the two strands of liquids of the carbon nanotube dispersion liquid A and the graphite dispersion liquid B are combined, a linear carbon tube is embedded into graphene sheet layers to form a carbon tube insertion-layer graphite middle body, extremely high pressure difference (reach 3,000bar) is instantaneously formed when the liquid is released from a nozzle, so that graphite is exploded to form perfect crystal-structure graphene, and meanwhile, the carbon tubes are uniformly arranged on a surface of the graphene to form the graphene/carbon nanotube composite conductive paste C.

The invention relates to a nickel cobalt lithium aluminate positive electrode material as well as a preparation method and application thereof. The positive electrode material has a chemical formula of LixNiaCobAlcMdO2, wherein x is greater than or equal to 0.95 but smaller than or equal to 1.06; a is greater than or equal to 0.80 but smaller than or equal to 0.82; b is greater than or equal to 0.09 but smaller than or equal to 0.17; c is greater than or equal to 0.01 but smaller than or equal to 0.06; d is greater than or equal to 0 but smaller than or equal to 0.03; the sum of the a, the b and the c is 1.0 to 1.03; M is a doping element; the content of free lithium ions in the positive electrode material is lower than 0.1 weight percent of the positive electrode material. The positive electrode material is prepared through work procedures of mixing raw materials containing nickel cobalt aluminum precursors and lithium salts, performing high-temperature crushing at 300 to 400 DEG C and performing sintering, crushing and the like. The preparation process has the advantages that the material selection is wide; the production intensity is high; the physical diffusion is uniform, and the like. The preparation process can be widely used in positive electrode material production. The positive electrode material prepared by the method has the characteristics of low free lithium content, perfect crystal structure, high specific capacity and the like. Compared with the existing positive electrode material, the positive electrode material prepared by the technology provided by the invention shows the excellent electrochemical performance; the power battery energy density improvement, the service life prolonging and the like are facilitated.

The invention discloses a method for the low-temperature synthesis of zirconium silicate powder through non-hydrolytic sol-gel reaction by using zirconium acetate as a zirconium source. The method comprises the following steps of: by using ethyl orthosilicate and anhydrous zirconium acetate as precursors, LiF or MgF2 as a mineralizer, and chloroalkane or anhydrous lower alcohol as a solvent, mixing the precursors, the mineralizer and the solvent in proportion to prepare precursor mixed solution; feeding the solution into a hydrothermal synthesis reactor to perform the thermal treatment to form a zirconium silicate solid wet gel; and drying, grinding and sintering the zirconium silicate solid wet gel at the temperature of 650 DEG C to obtain the zirconium silicate powder with less powder agglomeration and perfect crystal form growth. The method has the advantages of further reducing the synthesis temperature of zirconium silicate and avoiding the emission of HCl corrosive gas along with simple process and convenient operation.

The invention discloses a method for preparing slowly digestible wheat starch through the coordination of a biological enzyme and low-temperature freeze-thawing, which comprises the following steps: performing debranching treatment on starch through a biological enzyme method; forming a structure the most of which is in the form of a compact perfect crystal under retrogradation action; and performing low-temperature repeated freeze-thawing treatment to destroy the perfect crystal of the starch so as to form a structure the most of which is in the form of an imperfect crystal, thus increasing content of the slowly digestible starch. The slowly digestible starch content in the slowly digestible wheat starch is no less than 30%; and after high-temperature cooking (at 100 DEG C), the residual content of the slowly digestible starch is up to 95% or above. Thus, the slowly digestible wheat starch is especially suitable for being developed into a food for diabetics, has the characteristics of stable property, high safety, low blood sugar generation index, high glucose utilization rate and the like, and is easy to realize industrial production.

The invention relates to the field of research on growth of RFeO3 photomagnetic function crystal, an optical floating zone secondary melting method is a brand new and efficient growth method for the materials at present. In the method, high-purity ferric oxide and rare earth oxide are used as raw materials to prepare a material bar through processes of milling, sintering, isostatic pressing and the like according to chemical proportion, and then, the material bar is placed in an optical floating zone furnace to grow in air atmosphere. A surface of a single crystal prepared by the method has ideal surface finish, density and uniformity, a characteristic peak of the single crystal is obviously increased, and FWHM is obviously reduced, so that crystallization quality of the crystal is greatly improved, a pure-phase integral RFeO3 crystal can be obtained more easily; simultaneously, the method has high efficiency and can appropriately adjust growth speed in a rang of 1-9mm/h according to different application goals, that is unachievable to traditional methods, such as a pulling method, a hydrothermal method, a descending method and the like.

The present invention discloses a cefuroxime sodium powder preparation for injection. The preparation is prepared by the following steps: (1) preparing a sodium acetate solution by dissolving sodium acetate with a solvent for standby; (2) adding the solvent and water, and adding cefuroxime acid with stirring until complete dissolution; adding activated carbon, decolorizing, filtering, mixing with the solvent, washing the residue and a filter bottle, and filling a crystallization tank with the filtrate; (3) applying the particle process morphology and molecular assembly process crystal product molecular assembly and shape-state optimization technology by Hebei Huamin Pharmaceutical Co. Ltd. of North China Pharmaceutical Co. Ltd., controlling the temperature and stirring speed, and dropwise adding sodium acetate solution; and adding a solvent agent according to the flow rate; (4) carrying out pumping filtration, washing, vacuum drying, weighing, and packing; and 5) packing the preparations in different specifications to obtain the cefuroxime sodium for injection. The cefuroxime sodium powder prepared by the method has the advantages of excellent hydrodynamic performance, perfect crystal shape, uniform particle size distribution, and greatly improved color grade, clarification, purity and stability.

There are provided a CZ system for manufacturing a single-crystal ingot, which produces a perfect crystal with good reproducibility through growth of a single-crystal ingot, as well as a method of manufacturing the single-crystal ingot. A system of manufacturing a single-crystal ingot by pulling a single-crystal ingot from molten raw material by means of a Czochralski technique, the system including measurement means for measuring the distance between the level of molten raw material and the bottom of a heat-shielding member. On the basis of the thus-measured distance, the temperature gradient of area G1 of the single-crystal pulled silicon ingot is controlled so as to produce a perfect crystal with good reproducibility, by means of controlling any factor for pulling a single-crystal silicon ingot selected from the group comprising the amount of heat applied to silicon melt, the level of silicon melt, and the pull rate of a single-crystal silicon ingot.

The invention belongs to the technical field of chemical engineering, and concretely relates to a method for synthesizing zeolite molecular sieve or SAPO molecular sieve, and an apparatus thereof. The synthesis method is characterized in that a gas-solid phase reaction of amorphous nonmetal oxide reactant dry glue in a pressure reactor is carried out in continuously flowing directing agent steam to form the zeolite molecular sieve or SAPO molecular sieve, the liquid hourly space velocity of the continuously flowing directing agent steam before vaporization is 1-50hr<-1>, the pressure in the pressure reactor is 0.1-1.5MP, and the reaction temperature is 100-200DEG C; and the directing agent steam discharged from the outlet of the reactor undergoes pressure reduction to normal pressure, and is cooled to a liquid which can be recycled. The synthesis reaction temperature and pressure, the composition of the above directing agent and the flow velocity of the steam can be adjusted, the crystallization process can be accelerated, and the obtained product has the advantages of pure phase, perfect crystal form, and small and uniform crystal grain size. The directing agent can be recycled, no waste gas or waste liquid is discharged, and realization of low-cost environmentally friendly large-scale industrial production is facilitated.

The invention discloses a large-size graphene stack structure wafer which is characterized in that a wafer structure comprises a graphene single crystal layer, an h-BN (hexagonal boron nitride) single crystal layer, an h-BN buffer layer and SiO2/Si wafer substrates from the top down sequentially. The wafer and the preparation method have the benefits that the wafer can be compatible with a production technique of the available silicon substrate semiconductor device sufficiently, and can take full advantage of the characteristic of a hexagonal boron nitride substrate material; growing graphene has a most perfect crystal structure and a carrier transport environment with the weakest scattering; the super-high mobility of carriers in graphene is kept at the utmost; and the performance of a graphene substrate electronic device is improved greatly.

The invention discloses a rare earth garnet type ferrite compound and a preparation method thereof, which belong to the technical field of inorganic materials and preparation processes thereof. The rare earth garnet type ferrite compound comprises R3Fe[5-y]MyO12, wherein R is Pr, Nd, Sm or Eu, M is Mn, Cr or V and y is more than or equal to 0 and less than3; and calcium or strontium can be doped at C bit. In the preparation method, trivalent rare earth nitrate and Fe(NO3)3 used as reactants, MnCl2 and the like as doped metal salts and KOH as a mineralizing agent are mixed, stirred and are subjected to alkalinity adjustment and hydrothermal reaction in the presence of a large amount of mineralizing agents. The invention discloses a preparation method of the rare earth garnet type ferrite compound which is difficult to synthesize and is unstable at high temperature and has the characteristics of simple operation, mild conditions, high reaction speed, good repeatability, low cost and the like; and in addition, by using the preparation method, a pure phase product with smooth and perfect crystal can be synthesized, the grain diameter of the product is small to several hundreds of nanometers and the monocrystal X-ray analysis can be carried out when the grain diameter is approximately dozens of micrometers.

The invention provides a calcium metal-organic coordination polymer and a preparation method thereof, belonging to the field of coordination chemistry. The chemical formula of the calcium metal-organic coordination polymer is [C22H21N2O13Ca2] which belongs to an orthorhombic system; the space group is P2[1]2[1]2[1]; and the cell parameters are as follows: a=13.883(11)A, b=13.883A, c=17.739(14)A, alpha=90.00 degrees, beta=90.00 degrees, gamma=90.00 degrees, and V=3419(4)A<3>. The metal organic coordination polymer is synthesized by a solvothermal process, thereby being beneficial to quickly obtaining the perfect crystals with fewer defects and uniform orientation. The preparation method is simple, and the metal ions preferably adopt pollution-free harmless calcium ions, so the raw material is accessible and economical. The obtained polymer has the advantages of high yield and favorable chemical stability, and has excellent application potential in the fields of gas adsorption and separation, catalysis, identification, optics and the like.

The invention discloses a preparation method of chrysotile nanotubes in direction arrangement, comprising the following steps: 1) placing NaOH solution in a hydrothermal reaction kettle; 2) preparing water solution doped with magnetic ions, adding the water solution in the hydrothermal reaction kettle; 3) separately weighting active MgO and nano-SiO2 powder according to a molar ratio of 3 to 2, adding the active MgO and nano-SiO2 powder in the hydrothermal reaction kettle in turn, then adding distilled water in the reaction system, adjusting the pH value of the reaction system to 11-13.8; 4) sealing the hydrothermal reaction kettle and placing the kettle in a magnetic field; meanwhile, heating the hydrothermal reaction kettle and keeping temperature to perform a reaction for 15-80h, cooling; then opening the cooled hydrothermal reaction kettle, sucking up the upper clear liquid slowly and adding distilled water slowly for washing until the washing water which is sucked up is neutral; then heating and drying the product after opening the kettle to obtain the nanotubes of the invention. The method is simple, and the produced chrysotile nanotubes are pure with a perfect crystal structure so that the method is applicable to the nano-assembly and can be used in the preparation of nano-submicron devices.

The invention discloses a production method of ultrafine tungsten carbide powder with good dispersity, perfect crystals and high purity. The production method of the ultrafine tungsten carbide powderwith the good dispersity, the perfect crystals and the high purity comprises the steps of (1) using ammonium paratungstate as a raw material, and conducting calcination to generate a tungsten oxide precursor; (2) conducting hydrogen reduction on the tungsten oxide precursor obtained in the step (1) through an automatic pusher four-tube furnace to obtain tungsten powder; and (3) conducting carbon addition on the tungsten powder produced in the step (2), using carbon black as a C source, adopting a planetary ball mill for dry-milling, placing a material subjected to ball milling in a tube atmosphere furnace, and conducting carbonation in a hydrogen atmosphere to produce the ultrafine tungsten carbide powder. According to the production method of the ultrafine tungsten carbide powder with thegood dispersity, the perfect crystals and the high purity, the ammonium paratungstate is used as the raw material, by adjusting and controlling a calcination technology, the ultrafine tungsten oxideprecursor is obtained, furthermore, in the reduction process, synchronous crystallization of tungsten crystals is controlled, a fast and complete carbonation process is achieved, meanwhile, impurity elements are monitored, a gas deoxygenation technology is used, the key impurity content and the oxygen content are controlled, and finally, the ultrafine tungsten carbide powder with the good dispersity, the perfect crystals and the high purity is obtained.

The invention discloses a preparation method of a reduced graphene oxide base composite membrane. The method comprises the steps that graphene oxide is adopted as a raw material and mixed with other substances in water or other solvents, the reduced graphene oxide base composite membrane or a reduced graphene oxide base composite gel membrane is prepared through a hydrothermal reaction or a solvothermal reaction in a reaction kettle, and the reduced graphene oxide base composite gel is converted into the composite membrane through freeze drying or supercritical drying. The synthesized composite membrane can be wetted and dried in a solvent to obtain a thinner composite membrane. The reduced graphene oxide base composite membrane can be reduced through high temperature to obtain the reducedgraphene oxide base composite membrane with the higher graphene reducing degree and the perfect crystal structure.

The invention discloses a synthesis method for a Silicalite-1 molecular sieve, wherein the method comprises the following steps: (1) mixing evenly a silicon source, a structure directing agent, a mineralizer and water, to obtain a reaction mixture with the molar ratio of OH<->:SiO2:R:F:H2O=(0.05-5):1:(0.05-0.39):(0.05-5):(2-100), wherein R represents the mole number of the structure directing agent, F represents the mole number of the mineralizer, and the structure directing agent is at least one selected from the group consisting of tetraethylammonium hydroxide, tetraethylammonium bromide, tetraethylammonium chloride, tetraethylammonium fluoride, tetraethylammonium iodide and triethylamine; (2) transferring the reaction mixture obtained in the step (1) to a pressureproof airtight container, crystallizing for 0.5-60 days at the temperature of 80-200 DEG C and at the self-generated pressure, to obtain a crystallized product; and (3) recycling the crystallized product obtained in the step (2). By the synthesis method, the Silicalite-1 molecular sieve with uniform and perfect crystal grains can be synthesized under the action of the novel structure directing agent.

The invention provides an anode active material. The structural formula is LiyMxM'1-xSiO4-0.5zFz, wherein x is more than or equal to 0 and less than or equal to 1; y is more than or equal to 2 and less than or equal to 2.2; z is more than or equal to 0.01 and less than or equal to 0.1; M is selected from one or more of Mn, Fe, Ni and Co; and M' is selected from one or more of Mn, Fe, Ni and Co. The anode active material has good electric conductivity, excellent multiplying power discharge performance, stable structure, excellent cycle performance and high capacity at the same time. Meanwhile, the invention provides a preparation method for the anode active material, which comprises the following steps of: a, mixing and ball-milling a lithium source, an M source, an M' source, a fluorine source and a silicate radical source; b, performing ultrasonic treatment on the ball-milled substances of the step a, and drying; and c, sintering the substances obtained in the step b under inert atmosphere. The method is simple and easy to implement, and the prepared material has the advantages of perfect crystal form, no agglomeration, and uniform granule diameter distribution.