31results about How to "Thin lamellar" patented technology

The invention discloses a preparation method of N-doped graphene / graphene nanobelt composite aerogel, and belongs to the technical field of composite materials. The preparation method comprises the following steps: 1, preparing a graphene oxide dispersion liquid; 2, preparing a graphene oxide nanobelt dispersion liquid; 3, carrying out pre-reduction freezing evaporation drying treatment; and 4, carrying out high-temperature heat treatment. According to the method, by introducing the graphene oxide nanoribbons, more active sites are provided for N doping, and the N doping concentration can be increased; the three-dimensional porous structure of the aerogel can be regulated and controlled by the content of the graphene nanoribbons; and the N doping degree can adjust the electrical and thermal properties and the chemical activity of the material. The N-doped graphene / graphene nanobelt composite aerogel prepared by the method has ultralow density, high porosity and excellent thermal and electrical properties, and is expected to be applied to the fields of electromagnetic stealth, electrochemistry, catalysis, adsorption, water treatment and the like.

The invention provides a kind of conductive powder coating, each component is calculated by weight, comprises:

The invention relates to a nickel metaphosphate micro-nanomaterial as well as a preparation method and an application thereof. The micro-nanomaterial has a nano sheet array structure, and the lamellar thickness of nano sheets is less than 20nm. The nickel metaphosphate micro-nanomaterial is prepared through the preparation method comprising the following steps: dissolving a soluble nickel salt and weak base molecules in a solvent to react together with carbon cloth to obtain a nickel-containing precursor / carbon cloth complex, and then performing heat treatment on the nickel-containing precursor / carbon cloth complex and a phosphate compound in an inert atmosphere to obtain the nickel metaphosphate micro-nanomaterial. Based on a structure duplication thought, the invention adopts a two-step method to achieve preparation of a micro-nanostructure and growth of a nickel metaphosphate crystal phase, respectively, the preparation of the nickel metaphosphate micro-nanomaterial with a single crystal phase is achieved, the experiment operation is simple and safe, and scale production and application can be achieved. The prepared nickel metaphosphate micro-nanomaterial has a significant pseudocapacitance characteristic, and the specific capacitance is greater than 2000F / g when the discharge current is 1A / g, so that the nickel metaphosphate micro-nanomaterial has a good potential application prospect in the aspect of electrochemical energy storage.

The invention discloses a method for preparing graphene through thermal reduction. The method comprises the following steps in sequence: processing dispersed graphene oxide colloid through a solution containing alkali metal ion or alkaline earth metal ion, wherein the dispersed graphene oxide colloid is prepared by a Hummers method; drying in vacuum to obtain the graphene oxide containing the alkali metal ion or alkaline earth metal ion; heating and igniting the obtained graphene oxide in order to realize the reduction reaction; washing and filtering the reaction product; and drying to obtain the graphene. The graphene prepared by the method is thin in lamella, dilated and loosen in structure, and few in oxygen-containing functional groups on the surface; and a super capacitor electrode adopting the graphene can generate ideal electrical double-layer resistance in a water electrolyte and reaches the specific capacity of 78F / g; and the graphene has a certain retardant characteristic respect to the combustion flam, so that the graphene can be used as the material of the fire retardant; and the method is simple in process, low in cost, short in production period, and easy for massive production.

The invention discloses a preparation method and application of a stratiform bimetallic oxide sorbent capable of effectively removing low-concentrated phosphate radical. According to the invention, a hydrophobic ionic liquid BmimPF6 is taken as oil phase, and N,N-dimethyl formamide (DMF) is taken as a cosolvent in a Bmim PF6 / DMF / H2O ionic liquid-in-water inverse surfactant-free microemulsion system, a small particle diameter ultrathin stratiform bimetallic hydroxide nanosheets precursor is prepared according to a double microemulsion coprecipitation method, calcination of the precursor is carried out at high temperature of 500 DEG C so as to prepare stratiform bimetallic oxides adsorbent. The obtained stratiform bimetallic oxides are 107.36-158.46 cm<2> / g in specific surface area, 8.56-11.17 nm in pore diameter, and 0.358-0.468 cm<3> / g in pore volume. The stratiform bimetallic oxides can restore and form stratiform bimetallic hydroxide nanosheets in an aqueous medium, wherein the particle diameter of nanosheets is 150-200 nm, the thickness is about 5 nm, and the distribution of particle diameters is uniform. The adsorption rate of the stratiform bimetallic oxides is far higher than that of large-grained hydrotalcite prepared from the precursor stratiform bimetallic oxides of the sorbent according to the traditional coprecipitation method.

The invention discloses an H-type MCM-22 molecular sieve, a preparation method and application thereof. According to the H-type MCM-22 molecular sieve, diffraction peaks appear when 2 theta is 7.2+ / -0.09 degrees, 8.0+ / -0.10 degrees, 9.6+ / -0.07 degrees, 12.7+ / -0.10 degrees, 14.4+ / -0.07 degrees, 15.8+ / -0.08 degrees, 20.0+ / -0.11 degrees, 22.7+ / -0.15 degrees, 25.1+ / -0.15 degrees, 26.1+ / -0.12 degrees and 26.9+ / -0.13 degrees; the outer surface area is 270-500m<2> / g; and the lamella thickness is 2.5-20nm. The H-type MCM-22 molecular sieve provided by the invention has the advantages that the outer surface area is large, and the lamellar thickness does not exceed 20nm.

The invention provides a porous graphene material, a preparation method thereof, a capacitor electrode, a capacitor and an electric device, and relates to the technical field of graphene. The preparation method of the porous graphene material uses potassium carbonate as an activator and a template, uses coal tar as a carbon source, mixes coal tar and potassium carbonate, and prepares a porous graphene material by calcining. The preparation method is environmentally friendly. , Simple, high yield, low equipment requirements, etc., the prepared porous graphene material has the characteristics of controllable specific surface area, well-developed pores, and thin sheets. The porous graphene material provided by the present invention is prepared by the above-mentioned preparation method. The structural characteristics of the porous graphene material make it possible to shorten the ion diffusion distance, facilitate the transmission of charges, and expose more adsorption sites. point, which is conducive to the further application of porous graphene materials. The present invention also provides a capacitor electrode, which is made of the above-mentioned porous graphene material.

The invention relates to the technical field of preparation of nanophase materials, and in particular relates to a preparation method of graphene powder. The preparation method comprises the following steps: (1) preparing a graphene oxide solution; (2) adding organic small molecules to the graphene oxide solution, stirring and drying to obtain graphite oxide containing the organic small molecules; and (3) carrying out heat reduction treatment on the dried graphite oxide containing the organic small molecules to obtain graphene powder. The graphene powder prepared by the method provided by the invention has the characteristics of high degree of peeling, thin sheets, few structural defects, good degree of order and excellent electric conductivity, and has great application prospects in the fields of lithium-ion batteries, supercapacitors and the like.

The invention provides a nickel ferrite nanosheet as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, adding ferric salt and nickel saltto water, uniformly mixing; S2, adding a precipitator to solution obtained in the step S1, uniformly mixing; S3, performing hydrothermal reaction on solution obtained in the step S2, purifying a product to obtain a nickel ferrite precursor; and S4, performing high temperature thermal treatment on the nickel ferrite precursor obtained in the step S3 to obtain the nickel ferrite nanosheet. The provided preparation method is safe and stable, pollution-free, easy to obtain raw materials, easy to operate, simple in equipment, and higher in yield, and the prepared nickel ferrite nanosheet is largerin dimension, a sheet layer is thinner, and the appearance is integrated, so the nickel ferrite nanosheet has an extensive application prospect in electromagnetic materials, catalysts and catalyst carriers.

The invention relates to a graphene oxide / manganese tungstate / polyethylene glycol nanometer hybrid material and a preparation method thereof. The preparation method comprises the following concrete steps: separately preparing an alcoholic solution of a divalent manganese salt and an alcoholic solution of nanometer graphene oxide and then carrying out mixing under stirring so as to prepare a mixed solution; preparing an aqueous tungstate solution; and slowly adding the aqueous tungstate solution into the mixed solution, then adding aminocaproic acid, carrying out stirring and heating, then adding polyethylene glycol again, carrying out a continuous reaction for 3 to 5 h, then successively carrying out natural cooling to room temperature, centrifugation and washing, dispersing a solid product in deionized water and carrying out ultrasonic treatment so as to obtain the nanometer hybrid material. Compared with the prior art, the preparation method provided by the invention uses easily available raw materials and is simple in process and good in economic performance and practicality; and the prepared graphene oxide / manganese tungstate / polyethylene glycol nanometer hybrid material is in a two-dimensional thin laminar shape, has excellent dispersibility and biocompatibility, outstanding photo-thermal effect and obvious imaging effect and can be used for MRI imaging, PA imaging, CT imaging or photo-thermal treatment.

The invention belongs to the technical field of nanometer materials, relates to a graphene material, and particularly relates to a preparation method of a large sheet diameter graphene and the large sheet diameter graphene. The provided preparation method of the large sheet diameter graphene takes graphite as the raw material and high-viscosity syrup as a peeling auxiliary, the large sheet diameter graphene is prepared by means of mechanical peeling; wherein the viscosity range of the syrup is 5*10<4> to 1.5*10<6> centipoise. Meanwhile, the syrup is regenerated and recycled through the simplereduced pressure distillation after the separation, the process is simple, the condition is mild, the cost is low, the preparation method is efficient and environmentally friendly, and the prepared graphene material has the advantages of large sheet diameter and high electrical conductivity.

The invention discloses a preparation method and application of large-area graphene. The method comprises the steps of mixing an oxygen-containing organic polymer and a nickel salt, placing the mixture in an inertia atmosphere for calcination, washing the calcinated product with an acid liquid, and drying the product to obtain the large-area graphene. The method is simple and convenient to operate, and is short in period and high in yield, and industrial production is facilitated; and the obtained large-area graphene can be used as a sodium ion battery electrode material and has excellent electrochemical performance.

The invention belongs to the technical field of graphene preparation methods, and particularly relates to non-wrinkle graphene and a preparation method thereof. The preparation method comprises the following steps: dispersing graphite and a metal salt catalyst into a reaction solvent containing carbonyl, putting the reaction solvent into a reaction kettle, carrying out heating for a reaction to prepare a graphene dispersion liquid, standing the graphene dispersion liquid until layering, removing the supernatant, pickling the residual parts, and dispersing the residual parts in an organic solvent, carrying out ultrasonic treatment and centrifuging, collecting the supernatant turbid liquid, and carrying out drying to obtain the wrinkle-free graphene. Compared with ''rough'' wrinkled graphene, the graphene obtained by the method is flat and is free of wrinkles, and has a good application prospect in the aspects of oxidation resistance and electrical conductivity.

The invention relates to a method utilizing supercritical CO 2 A method for preparing graphene by assisted liquid phase exfoliation, mixing graphite powder and organic solvent evenly, adding it to a preheated reaction kettle, feeding it into the reaction kettle and continuously stirring, and starting the reaction after reaching the preset supercritical pressure; the reaction After the end, the reactor was cooled to CO 2 Below the critical point, CO is emitted 2 , the solution is taken out for ultrasonic treatment, and the supernatant is taken after centrifugation to obtain a graphene solution; the method of the present invention is simple to operate, mild in condition, high in product quality, and CO 2 Environmental protection, low cost, and less organic solvent consumption; therefore, this method is a technology for industrialized green production of graphene with practical application prospects.

The invention relates to an epoxy resin / montmorillonite nanocomposite coating for metal surfaces and a method for preparing a composite film by using the nanocomposite coating. In the present invention, lithium chloride is used to peel off the montmorillonite sheets, and hexadecylamine is used to organically modify the peeled montmorillonite, so that the hydrophilic montmorillonite is transformed into lipophilic, and the interlayer distance of the montmorillonite is expanded. , the interlayer force becomes weaker, so that the montmorillonite can be more uniformly dispersed in the polymer. The preparation method of the epoxy resin / montmorillonite nanocomposite membrane material is simple, does not require complex equipment, and has huge reserves of sodium montmorillonite, which is suitable for industrial production.