42results about How to "Preparation high" patented technology

The invention relates to a method for forced uniform solidified continuous preparing metal slurry, comprising that (1) melting overheat metal with the temperature more than the liquidus temperature about 0-100deg.C is poured into upper guide flow pipe; (2) the liquid metal flows into the melting deconcentrator and the liquid metal is injected on the inner round wall of melting deconcentrator; the temperature control system out of pulping room make the wall temperature of pulping room be controlled lower than the liquidus temperature about 0-100deg.C; the liquid metal is collected at the cone bottom to obtain the metal slurry with solid fraction smaller than 30%; the metal slurry flows out through the lower guide flow pipe and the temperature is controlled in -10-10deg.C of liquidus temperature; (3) the metal slurry flows into the collector or is sent into the common equipment such as die-casting, rolling and forging so on directly to carry rheological forming out and or is cast into the mould continuously to produce semi-solid continuous casting slab. The merit of invention is that the preparation of metal slurry is uniform, mass and continuous, and it can satisfy the demand of huge industrial production easily.

The invention discloses a graphene and nickel diselenide composite and a preparation method thereof. The preparation method comprises the steps that a reducing agent is mixed with a graphene oxide solution, even stirring is conducted to form a brown solution, the brown solution is added into a stainless steel reaction kettle with a polytetrafluoroethylene liner, and selenium containing matter and nickel containing inorganic salt are filled into the reaction kettle; the reaction kettle is closed to conduct the reaction; after the reaction is conducted, natural cooling is conducted, suction filtration is conducted on a mixture in the reaction kettle, repeated washing and suction filtration are conducted through distilled water and absolute ethyl alcohol, and the product is collected for storing after drying is conducted. According to the prepared graphene and nickel diselenide composite, nickel diselenide nanoparticles are wrapped with the graphene, nickel diselenide is closely combined with graphene sheets, and the composite has larger specific surface area. According to the graphene and nickel diselenide composite and the preparation method thereof, a simple solvothermal method is adopted, reduction of graphene oxide and preparation of the graphene oxide and the nickel diselenide composite are conducted synchronously, the technology is simple, the reaction temperature is low, the cost is low, the preparation method is green and controllable, and the graphene and nickel diselenide composite is suitable for industrial production.

The invention discloses a method for producing 5-hydroxymethyl furfural by chitin biomass. The method comprises the steps of preparing a zinc chloride water solution of which mass concentration is 30-72%; evenly mixing the dried chitin biomass material, the zinc chloride water solution and a catalyst; reacting for 10 minutes to 10 hours after the reaction is finished at 60-140 DEG C, wherein the mass ratio of the chitin biomass material to the zinc chloride water solution is 1: (3-180); the mass ratio of the added catalyst to the chitin biomass material is 1: (1-50); extracting the 5-hydroxymethyl furfural from a reaction system by an organic extracting agent after the reaction is finished; then concentrating and drying the extracting agent, and crystallizing to obtain the 5-hydroxymethyl furfural product. The method has the advantages of being wide in source of the chitin biomass, abundant in storage, simple in operation process and high in obtained product purity.

A preparation method of a self-supporting two-dimensional transition metal/metal oxide mixed-phase nanosheet relates to a preparation method of a two-dimensional nano material and solves the problems of complex technology, harsh reaction condition and poor electric conductibility of transition metal oxide in the conventional method for preparing the self-supporting two-dimensional transition metal/metal oxide mixed-phase nanosheet. The preparation method of the mixed-phase nanosheet comprises the following steps: firstly, inorganic transition metal salt, organic amine, alcohol and water are mixed to form a turbid liquid of an organic amine complex containing metal ions; secondly, the turbid liquid reacts under a high-temperature solvent thermal condition to generate a precursor of the metal/metal oxide mixed-phase nanosheet; finally, high-heat treatment is conducted under the protection of inert gas to control the crystallinity of the two-dimensional metal/metal oxide mixed-phase nanosheet. The preparation method provided by the invention has the advantages of simple technology and lower equipment requirement; the mixed-phase nanosheet prepared by the method has excellent electric conductibility.

The invention discloses a preparation method of metal sulfide porous framework/graphene composite fiber. The metal sulfide porous framework/graphene composite fiber is obtained through calcination with a fiber-like compound prepared by compounding MOF crystal powder and graphene oxide as a precursor. The preparation method is simple to operate, conditions are mild, the shape is adjustable, the structure is controllable, component distribution is uniform, the structural integrity of a metal sulfide porous framework obtained with graphene and MOF crystals as templates is kept, excellent properties of graphene and properties of the metal sulfide porous framework are integrated, the fiber can be produced in batches or industrially produced, and the fiber serves as a lithium ion battery negative electrode material, is excellent in performance and has a good application prospect.

The invention belongs to the field of technologies for preparing supported catalysts, and particularly relates to a method for preparing graphene-supported palladium-iridium nano-particle catalysts and formic acid oxidation electrocatalysis application of the graphene-supported palladium-iridium nano-particle catalysts. The method includes steps of 1), adding graphene into formic acid solution and ultrasonically uniformly mixing the graphene and the formic acid solution with each other; 2), uniformly dispersing mixed solution prepared from chloroiridic acid and sodium chloropalladate under ultrasonic conditions; 3), heating mixed solution obtained at the step 2); 4), quickly injecting mixed solution obtained at the step 3) into graphene and formic acid mixed solution obtained at the step 1) and carrying out ultrasonic treatment under sealed conditions; 5), cleaning obtained products and then drying the products. The method and the formic acid oxidation electrocatalysis application have the advantages that the graphene-supported palladium-iridium nano-particle catalysts have extremely large electrochemically active specific surface areas and are extremely high in formic acid oxidation catalytic activity, high-toxicity materials are omitted, and the method is easy and convenient to implement, high in repeatability and suitable for mass production.

The invention discloses a core-shell structure palladium-copper catalyst and a preparation method thereof and catalytic application thereof, and belongs to the field of nanocatalysis. The core-shell structure palladium-copper catalyst comprises a palladium nanosheet and a copper shell layer coating the surface of the palladium nanosheet, wherein the palladium nanosheet has a size of 5 to 200 nm and a thickness of 0.5 to 3 nm; and the thickness of the copper shell is 0.1 to 10 nm. The palladium nanosheet is dispersed in water, hydrogen gas is introduced, after the reaction, an aqueous solutioncontaining copper ions is added, and sealing reaction is continued to obtain the core-shell structure palladium-copper catalyst. An catalytic application method is as follows: the core-shell structurepalladium-copper catalyst is collected by centrifugation, washed with ethanol and dried to obtain catalyst powder; the catalyst powder is dispersed in ethanol, phenylacetylene is added to a water bath and stirred, and H2 is introduced to react.

The invention relates to a method for preparing flexible iron sesquioxide/ferroferric oxide and nitrogen doped carbon composite nano-fibers. The method has the advantages that the problem of poor toughness and electric conductivity of existing metal oxide can be solved by the aid of the method; flexible macromolecules are used as supports and are subjected to composition with metal organic gel precursors with plasticity to obtain precursors, and the precursors are subjected to pyrolysis in inert atmosphere and air atmosphere to obtain the flexible iron sesquioxide/ferroferric oxide and nitrogen doped carbon composite nano-fibers which are flexible metal oxide and nitrogen doped carbon composite nano-fibers; the problems of complicated and harsh conditions for preparing flexible metal oxide and carbon composite materials, high costs and difficulty in large-scale production at present can be solved by the aid of the method; raw materials for the flexible iron sesquioxide/ferroferric oxide and nitrogen doped carbon composite nano-fibers are low in cost, processes for preparing the flexible iron sesquioxide/ferroferric oxide and nitrogen doped carbon composite nano-fibers are simple, and the method is short in synthesis period, good in repeatability and high in yield, and industrial production can be facilitated; the flexible iron sesquioxide/ferroferric oxide and nitrogen doped carbon composite nano-fibers can have characteristics of bendable properties and excellent electrochemical performance, accordingly, the method has an extremely broad application prospect in the field of wearable electronic devices, and the like.

The invention relates to an active hydrogen generator which is provided with a supercharging device, a water activating device, a hydrogen enriching device and an electron releasing device, and the supercharging device, the water activating device, the hydrogen enriching device and the electron releasing device are sequentially connected through a water supply pipe. The water activating device comprises a first filter cartridge, and energy spar and projectile natural ore are arranged in the first filter cartridge; the hydrogen-enriching device comprises a second filter cartridge; a combined multifunctional health-preserving hydrogen-enriching water sheet and a composite medical stone ceramic ball are arranged in the second filter cartridge; the electron release device comprises an inner ribbed tube, and a combined material composed of a composite tourmaline ceramic ball and an electrode metal band is placed in the inner ribbed tube. The active hydrogen generator can prepare a large amount of active hydrogen in a lasting, safe and environment-friendly manner, and third-party detection data shows that the content of the active hydrogen in water treated by the active hydrogen generator reaches 5-8 PPm.

The invention discloses a preparation method for a PPy and NCCs compound film electrode material. The preparation method is characterized by comprising the steps of performing pretreatment and hydrolysis on plant raw materials to obtain NCCs from the plant raw materials, mixing the obtained NCCs with pyrrole monomers to form an electrolytic solution, and obtaining the PPy and NCCs compound film electrode material through preparation by an electrochemical method. According to the preparation method, the PPy and NCCs compound film electrode material with the electrochemical property enhanced is obtained by using cheap plant raw materials or even waste plant raw materials; the preparation method is fast and environmentally friendly, mild in synthesis condition and low in cost. The preparation method can also be broadened to be applied to preparation of various conductive polymer composite materials, such as polyaniline, polyacetylene, polythiophene and poly-phenylene vinylene.

The invention provides a carbonate-bismuth oxyiodide compound catalyst and a preparation method thereof. The preparation method in the embodiment of the invention comprises the following steps: compounding barium carbonate or strontium carbonate with bismuth oxyiodide through a chemical precipitation method, and thus obtaining a barium carbonate-bismuth oxyiodide compound photo-catalyst or a strontium carbonate-bismuth oxyiodide compound photo-catalyst. According to the preparation method in the embodiment of the invention, a heterojunction formed by the prepared compound photo-catalyst has a matched energy gap, and is beneficial to separation and transmission of photo-induced electrons; photo-response is expanded to a visible region from an ultraviolet region, and the photo-absorption efficiency is improved; moreover, increased specific surface area is beneficial to adsorption of pollutants and generation of reaction sites, so that the catalyst has an excellent catalytic performance under visible light, and the preparation of the photo-catalytic material is expanded.

The invention relates to a porous graphene loaded ferrocobalt sulfide catalyst as well as a preparation method and application thereof, and belongs to the technical field of clean energy nano materials and catalysis. Graphene oxide, melamine, formaldehyde, a cobalt source and an iron source are subjected to a hydrothermal reaction to prepare graphene hydrogel, and the graphene hydrogel and a sulfur source are fully mixed and then subjected to high-temperature heat treatment in a protective atmosphere to prepare the porous graphene loaded ferrocobalt sulfide powder material. The powder is subjected to acid pickling and secondary heat treatment to prepare the porous graphene loaded ferrocobalt sulfide nano-particles, the nano-particles are of a special core-shell structure, and the particle size is 21-24 nm. The material shows excellent catalytic activity and stability when being used as an oxygen reduction and oxygen evolution catalyst of an alkaline reaction system, and can be applied to electrode materials of fuel cells and zinc-air batteries.

The invention relates to a novel antigen epitope peptide based on CD271 and application of the novel antigen epitope peptide. The antigen epitope peptide is: (1) located in SEQ ID NO.1; or (2) is located in an amino acid sequence having at least 80% identity with the SEQ ID NO.1 sequence in (1); wherein SEQ ID NO.1 contains one or more antigen epitopes, and the length of the amino acid sequence of the antigen epitope peptide is 5-70% of the full length of the SEQ ID NO.1. An antibody, a nucleic acid aptamer, a vaccine, nanoparticles and the like targeting the antigen peptide can be stably combined with natural cells with CD271 protein. The antigen epitope peptide or nucleic acid, fusion protein, carrier or host cell and the like containing the antigen epitope peptide have important application significance in the fields of preparation of CD271 related detection reagents, disease treatment biological drugs, vaccines and the like.

The invention provides a preparation method of a graphene-coated silicon particle composite material. The preparation method comprises the steps of 1, performing uniform mixing on carbon powder and asilicon-containing material and then performing pressing to prepare a carbon/silicon rod; 2, putting the carbon/silicon rod into electric arc equipment to be used as a negative electrode, inflating with H<2> and He<2>, adjusting the distance between the carbon/silicon rod and a positive electrode rod, and controlling current and performing arc discharge to prepare a product A; and 3, performing emulsification, ultrasonic processing, freezing and drying on the product A to obtain the graphene-coated silicon particle composite material. By taking the carbon powder and the silicon-containing material as the raw materials and by adopting the arc discharge method as the preparation means, silicon particles are intercalated between graphene layers so as to obtain the composite material; comparedwith the conventional method, the method disclosed in the invention is simple and convenient in process and low in cost; the material is uniform in appearance and stable in structure, so that the problems of silicon particle agglomeration and expansion can be solved; and compared with the similar silicon/graphene composite material, the graphene-coated silicon particle composite material shows higher electrochemical performance.

The invention discloses a preparation method of an EBSD sample of Ti2AlNb alloy powder, and belongs to the technical field of powder metallurgy titanium alloy processing. The method comprises the following steps: firstly, pouring a low-viscosity Surr embedding set and Ti2AlNb powder into a Ti-6Al-4V crucible, and uniformly mixing the low-viscosity Surr embedding set and the Ti2AlNb powder; then curing a mixture at 70 DEG C for 10 hours; and sequentially carrying out grinding and mechanical polishing, and then carrying out ion bombardment, cleaning and blow-drying to obtain the EBSD sample of the Ti2AlNb alloy powder. The method is simple, convenient and flexible to operate, high in EBSD experiment success rate, easy to popularize and wide in application prospect.

The invention discloses a determination method for elastic constants of monocrystalline high temperature alloy, and belongs to the technical field of physical parameter determination of monocrystalline alloy. According to the method, two types of monocrystalline high temperature alloy plates with specific 3D orientations are prepared by a seed crystal method, first and second orientations of the first type of monocrystalline plate are (001) and (100) respectively, and first and second orientations of the second type of monocrystalline plate are (011) and (110) respectively. A rectangular elastic modulus sample whose length direction is in parallel with the primary orientation of the monocrystalline plate is cut from a material plate, and the young modulus E (001) and the shear modulus G(001)-(100) of the first type of sample and the shear modulus G (011)-(110) of the second type of sample are measured by a knock resonance method. The three elastic constants C11, C12 and C44 of the monocrystalline high temperature alloy can be simply calculated from the measured young modulus and two shear modulus.

The invention provides a method capable of continuously preparing micron-sized spherical gold powder with uniform particle size. According to the method, a rapid rotation nucleation method capable of effectively reducing interference of the external environment on gold grain nucleation is adopted, the gold-containing mother liquor and a reducing agent are introduced into a rapid rotation nucleation reactor at the same time, mass transfer reaction is rapidly completed in micro-nano liquid drops generated through high-speed rotation cutting, a huge amount of uniform crystal nuclei are formed, then the crystal nuclei are introduced into a rear reactor, and the gold-containing mother liquor is obtained. And the controllable growth of the spherical gold powder crystal grains is continuously completed until the spherical gold powder particles in the micron-sized particle size range are obtained, then the obtained micron-sized spherical gold powder precipitate is washed and dried, and the spherical gold powder with the uniform particle size can be obtained. The spherical gold powder which is high in purity, good in dispersity, smooth in surface and more uniform in particle size distribution compared with a common liquid phase reduction method can be continuously prepared through the method, and the average particle size D50 of the spherical gold powder ranges from 1 micrometer to 3 micrometers.