55results about How to "Enables high-volume preparation" patented technology

The invention discloses a graphene oxide microsphere and a graphene microsphere and preparation methods thereof. The graphene oxide microsphere and the graphene microsphere respectively comprise a three-dimensional porous structure mainly formed by assembling graphene oxide slices or reduced graphene oxide slices, wherein the three-dimensional porous structure comprises a simulated erythrocyte structure. The preparation method of the graphene oxide microsphere comprises the following steps: (1) electrostatic spraying: carrying out electrostatic spraying treatment on a precursor solution, so that a microsphere-shaped liquid drop is formed; and (2) wet collection: injecting a solidification liquid into the microsphere-shaped liquid drop, so that the graphene oxide microsphere is prepared. The preparation method of the graphene microsphere comprises the following step: preparing the graphene oxide microsphere into the graphene microsphere by utilizing a chemical reduction method. The preparation methods are simple to operate and convenient to regulate and control. The prepared graphene microsphere is high in purity, and the raw materials are obtained easily, so that the production cost is low and the production efficiency is high. Therefore, the graphene microsphere can be prepared in batches.

The invention discloses a method for preparing a gold nano particle and grapheme composite material through fast reduction. The method specifically comprises the steps of 1, preparing reduced grapheme oxide water solution by taking sodium borohydride as a reducer; 2, adding gold chloride acid in the reduced grapheme oxide water solution, and obtaining the gold nano particle and grapheme composite material in an in-situ reduction way by utilizing the reducibility of the grapheme through ultrasonic action under normal temperature; 3, centrifugally washing the obtained solution by using de-ionized water for multiple times so as to obtain the gold nano particle and grapheme composite material of which the dimension is uniform and the distribution is uniform. The method disclosed by the invention has the advantages that the technology is simple, the preparation period is short, the repeatability is strong, environment protection is realized, and a composite product is uniform and stable; the prepared gold nano particle and grapheme composite material has good stability in water solution and is not easy to reunite, and meanwhile, the method has the characteristics of multiple reaction active sites, large specific surface area, good biocompatibility, electric conduction and the like; the method has a wide application prospect in aspects of catalyzing, sensing, environment protection, SERS (Surface Enhanced Raman Scattering) and the like.

The invention discloses an electromagnetic shielding case based on a micro metal grid and a manufacturing method of the electromagnetic shielding case. The method comprises the following steps that micro metal grid grooves are formed in a flexible substrate according to a micro-nano impressing method; the micro metal grid grooves are filled with nanometer conductive paste in a blade coating mode, and a micro metal grid conductive thin layer is formed after sintering; the micro metal grid is formed in the micro metal grid grooves after electroforming deposition; the deposited micro metal grid is stripped out of the micro metal grid grooves of the flexible substrate, so that the hollowed-out micro metal grid is formed; the hollowed-out micro metal grid is combined with a metal sheet with the same size as the hollowed-out micro metal grid, so that the combined micro metal grid is formed; the combined micro metal grid is fixed to a concave die, and the combined micro metal grid is rolled to have the same shape as the concave die; the combined micro metal grid is separated, so that the electromagnetic shielding case having the same shape as the concave die is obtained. The electromagnetic shielding case is high in manufacturing efficiency, low in cost and capable of being manufactured on a large scale.

The invention discloses a nitrogen-doped carbon-inlaid non-noble metal catalyst and a preparation method and application thereof. A non-noble metal organic complex and a compound of silicon dioxide are taken as precursors, and the catalyst for efficient decomposition of ammonia-borane into hydrogen by the aid of high temperature thermal decomposition and in combination with a selective etching strategy. The preparation method includes: dispersing the non-noble metal organic complex and commercial silica nanoparticles in an ethanol-chloroform two-phase solvent system and removing the solvent byspin evaporation to obtain composite nanopowder; putting the composite nanopowder in a tube furnace, raising the temperature to 700-1000DEG C under the protection of insert gas and keeping the constant temperature for 1-6 hours; repeatedly treating obtained black solid in a dilute alkali solution for 12-24 hours at the temperature of 50DEG C, and performing bleaching, washing and drying to obtainthe target catalyst. The catalyst shows excellent catalytic properties, resistance to poisioning/inactivation and cycling stability in the catalytic hydrolysis of ammonia-borane to produce hydrogen;the method has the advantages that the raw materials are easy to obtain, preparation period is short, and batch production can be realized.

The invention provides nitrogen plasma modified three-dimensional graphene powder, and a preparation method and an application of the graphene powder. The preparation method comprises the following steps that (1) dried three-dimensional graphene powder with a large specific surface area is placed on a bottom electrode in a chamber of plasma equipment; a top electrode is adjusted to allow that an appropriate spacing is kept between the bottom electrode and the top electrode; air in the chamber is removed; and nitrogen is supplied to the chamber; and (2) after the pressure in the chamber of the plasma equipment is stable, a high voltage direct current power supply is opened to stably generate a nitrogen plasma atmosphere; and nitrogen plasma modification treatment of the three-dimensional graphene powder is performed in the atmosphere to obtain the nitrogen plasma modified three-dimensional graphene powder. The nitrogen plasma modified three-dimensional graphene powder prepared by the method serves as a counter electrode material for assembling a dye-sensitized solar cell, and further replaces the traditional electrode material Pt, so that the photovoltaic efficiency of the cell can be obviously improved, and the production cost of the cell can be lowered.

The invention belongs to the field of chemical energy materials, and particularly relates to preparation of a nitrogen-doped mesoporous carbon material hydrogen evolution electrocatalyst, in particular to a nitrogen-doped mesoporous carbon loaded high-dispersion Ru nano-particle catalyst for catalyzing a water electrolysis hydrogen evolution reaction and a preparation method of the nitrogen-doped mesoporous carbon loaded high-dispersion Ru nano-particle catalyst. The preparation method specifically comprises the following steps: self-assembling a segmented copolymer template agent with a nitrogen-containing carbon source precursor and an amine compound in oil bath and hydrothermal processes to obtain a nitrogen-doped mesoporous polymer, then providing a wet chemical impregnation method at low temperature to successfully load Ru on the polymer precursor, finally carrying out a high-temperature carbonization process, and preparing the nitrogen-doped mesoporous carbon loaded high-dispersion Ru nano-particle catalyst. The performance of the catalyst is equivalent to that of commercial Pt/C, high current density can be generated under low overpotential, the catalyst has excellent long-term stability, the production cost of the catalyst is only 8% of that of the commercial Pt/C catalyst, the economic applicability is high, and a new insight and thought are provided for research of Ru-based hydrogen evolution catalysts.

The invention discloses a layered array method and device for depositing metal nanoparticles on a fiber end face. The method comprises the steps as follows: pretreatment of the fiber end face is carried out by using a piranha solution and a silane solution, and a monomolecular layer which can be combined with the metal nanoparticles firmly and easily is formed on the fiber end face; a reducing solution containing metal salt and a reducing agent is prepared, and two beams of laser are enabled to intersect and generate interference; and the fiber end face is placed in the intersecting area of the two beams of the laser in the reducing solution, and the periodic metal nanoparticle layered array corresponding to interfering light spots is formed on the fiber end face. Light for a deposition reaction is formed by interference generated by two beams of laser; the influence of optical fiber on reaction light is avoided; and the controllability of the silver nanoparticle deposition on the fiber end face is enabled to be higher.

The invention provides a method for preparing graphene and a graphene composite through reducing graphene oxide at the room temperature. The method comprises steps as follows: graphene oxide is dispersed in deionized water and a graphene oxide dispersion liquid is obtained; a catalyst is dispersed in deionized water and a catalyst dispersion liquid is obtained; the graphene oxide dispersion liquid and the catalyst dispersion liquid are mixed and a to-be-reduced liquid is obtained; a reducing agent is dispersed in the to-be-reduced liquid, the to-be-reduced liquid has a reduction reaction at the room temperature, and a coarse product is obtained; the coarse product is separated by a permanent magnet, then a product is subjected to dialysis, and graphene is obtained. The method can also be used for preparing the graphene composite from graphene oxide. The method is mild in condition, is mainly applied to the field of preparation of graphene and the graphene composite at the room temperature and low reducing agent concentration and is particularly suitable for preparation of graphene composites carried by bioactive materials sensitive to temperature and reducing agents.

A preparation method of a SiBCN ceramic precursor containing a borazine structure belongs to the field of inorganic non-metal materials. The preparation method comprises the following steps of: firstly, preparing methylchlorosilane into a Grignard reagent, and taking the Grignard reagent to react with chlorine-containing borazine to obtain a micro-molecular structure containing the borazine structure; and furthermore, carrying out aminolysis on a micro-molecular product containing a Si-CI group to obtain a corresponding polymer product. A micro-molecule and a polymer are SiBCN ceramic precursors. The problems of an existing preparation method that a process is difficult to control, the product is difficult to prepare in batches and the like are solved. According to the preparation method provided by the invention, the cost of raw materials is low, the product with higher purity is easy to obtain and the product can be prepared in batches.

The invention discloses a preparation method of blue niobium pentoxide. The preparation method comprises the following steps: taking an amorphous niobium oxide precursor, heating to 500-600 DEG C, andcalcining for 2-4 h to obtain white niobium pentoxide; and adding the white niobium pentoxide into an aqueous hydrochloric acid solution, performing ultrasonic dispersion, then adding metal powder, stirring for 5 min or above, centrifuging, and taking, washing and drying the obtained precipitate to obtain the blue niobium pentoxide. The invention further discloses the blue niobium pentoxide is prepared according to the method. The invention also discloses an application of the blue niobium pentoxide in preparation of a photothermal conversion material. The method is simple in process, free ofdangerous reagents, low in raw material cost, short in production period and capable of achieving industrial large-scale rapid production; the blue niobium pentoxide has a strong absorption effect onvisible light and near-infrared light; and the blue niobium pentoxide has good dispersibility and stability in water, has biocompatibility, and has a wide application prospect in the biomedical fields of photothermal therapy and the like.

The invention discloses a composite nano-material with carbon nano-sheets loaded with carbon nano-tubes in situ and a preparation method and application thereof.The preparation method comprises the steps that firstly, organic acid sodium salt or organic acid potassium salt serves as a raw material, and porous carbon nano-sheets are obtained through high-temperature heat treatment; dissolving an inorganic cobalt salt in an alcoholic solution, sequentially adding cyanamide micromolecules and porous carbon nanosheets, and carrying out mixing and ball milling to obtain a muddy mixed material; and finally, performing high-temperature carbonization treatment on the mixed material in an inert atmosphere, reducing cobalt ions into metal cobalt in the high-temperature inert atmosphere, loading the metal cobalt on the carbon nanosheets, and catalyzing cyanamide micromolecule high-temperature pyrolysis products by the metal cobalt to grow the carbon nanotubes in situ on the nanosheets. The raw materials adopted in the preparation method are low in price and easy to obtain, the preparation process is simple, and large-scale preparation can be achieved. The composite nano material has wide application prospects in new energy devices such as supercapacitors, lithium ion batteries, lithium-sulfur batteries, lithium-air batteries or fuel cells.

The invention discloses a flexible non-invasive optical fiber sensing type brain-computer interface electrode and a preparation method thereof. The electrode comprises an optical fiber, the optical fiber is a quartz cladding-free optical fiber, a sensing component is loaded on the optical fiber, and the material of the sensing component is a polyacrylamide (PAAm) hydrogel material prepared by synthesis. By combining an optical fiber backscattering technology and utilizing the response of polyacrylamide (PAAm) hydrogel to an electric signal, flexible non-invasive brain wave detection is realized; the measurement precision and accuracy of the electrode are improved; the electrode material is stable in chemical property, is friendly to skin and can be recycled; the preparation method is low in process complexity and can realize mass production. Therefore, the flexible non-invasive electrophysiological sensor has wide application value in the field of flexible non-invasive electrophysiological sensors, especially non-invasive brain-computer interface electrodes.

The invention belongs to the technical field of wet metallurgy, and discloses a method for recovering gold by using adsorption resin. The method for recovering the gold by using the adsorption resin comprises the following steps of: (S1) adjusting the pH value of gold-containing leaching liquid containing gold ions to 1-3, and then adding the adsorption resin to the gold-containing leaching liquid to adsorb the gold ions in the gold-containing leaching liquid, wherein the surface of the adsorption resin has a sulfur element and a nitrogen element, and the contents of the nitrogen element and the sulfur element on the surface of the adsorption resin respectively account for more than 3% and more than 20% of the total mass of the adsorption resin; and (S2) after the adsorption is finished, eluting, concentrating, separating and regenerating the gold loaded on the adsorption resin treated in the step (S1) by adopting an eluent, so as to realize the recovery of the gold. According to the method for recovering the gold by using the adsorption resin, key reaction participants are improved, and the adsorption resin material with high sulfur element content and high nitrogen element content on the surface is applied to recovery of gold and particularly can be applied to recovery of the gold in a low-grade gold-containing material. The method for recovering the gold by using the adsorption resin is easy to operate and suitable for large-scale recovery of low-concentration gold in the leaching liquid.

The invention discloses a preparation method and application of coralline-shaped layered porous carbon in a lithium sulfur battery. The coralline-shaped layered porous carbon is of a micro-nano gradedporous structure which is prepared from coralline branch shaped layered porous carbon through aggregation, the thickness of the layered porous carbon is 50-200nm, and the size is 1-5[mu] m. The preparation method of the coralline-shaped layered porous carbon comprises the following four steps: preparing a precursor solution, forming a double-hydroxide mold plate and a layered polymer, performinghigh-temperature carbonization, and removing the mold plate. The preparation method of the coralline-shaped layered porous carbon, which is disclosed by the invention, is simple and convenient and good in effect, and the prepared coralline-shaped layered porous carbon has good conductivity, meanwhile is rich in micro-nano graded porous structure, is capable of accommodating more sulfur, improvingelectrochemical properties of a sulfur anode, preparing a sulfur anode with a high carrying capacity when being applied to the anode of a lithium sulfur battery and remarkably increasing the energy density of the lithium sulfur battery, and has wide application prospects in lithium sulfur batteries.