31results about How to "Thin lamellar" patented technology

The invention discloses a method for preparing phosphaalkene. The method comprises the following steps: dispersing black phosphorus into a dispersion liquid, and performing ultrasonic treatment for 0.5-200 hours and then performing solid-liquid separation to obtain intercalation black phosphorus; dispersing the intercalation black phosphorus into a chemical foaming agent solution, performing ultrasonic treatment for 0.5-200 hours and then performing solid-liquid separation, and drying solids subjected to solid-liquid separation to obtain a solid mixture of black phosphorus and a chemical foaming agent; performing microwave treatment on the solid mixture of black phosphorus and the chemical foaming agent under the microwave powder of 100-1,000W, and preparing a finished product phosphaalkene after 1s-1h of microwave treatment. The phosphaalkene prepared by the method disclosed by the invention is proper and uniform in size; furthermore, the technology is simple, the cost is low, the peeling time is short, and the phosphaalkene yield is high; large-scale production is easy to realize.

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 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 an electric-conduction powder coating material, which comprises, by weight, 50-70 parts of a resin, 20-40 parts of a filler, 3.5-6.5 parts of a curing agent, 1-3 parts of an auxiliary agent, 0.05-1 part of graphene, and 0.05-0.2 part of wax powder.

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 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 discloses a method for catalytic preparation of high-purity black phosphorus by adopting a fixed bed. According to the invention, gaseous phosphorus enters a fixed-bed reactor from the bottom part of the fixed-bed reactor; a solid-state catalyst fills the fixed-bed reactor; under the action of the solid-state catalyst, gaseous phosphorus molecules are converted into gaseous black phosphorus molecules; the gaseous black phosphorus molecules enter black phosphorus crystallizers from the top part of the fixed-bed reactor; the fixed-bed reactor is connected with two black phosphoruscrystallizers; when one of the black phosphorus crystallizers is full, the pipeline valve of the black phosphorus crystallizer is closed, while the pipeline valve of the other black phosphorus crystallizer is opened for collection via the other black phosphorus crystallizer; the gaseous black phosphorus molecules are continuously collected by two black phosphorus crystallizers in turn; gaseous black phosphorus in the black phosphorus crystallizers is condensed into black phosphorus crystals; and catalytically-unreacted gaseous phosphorus returns to the fixed-bed reactor. The method provided bythe invention can prepare high-purity block-shaped black phosphorus, can prepare high-purity nanometer black phosphorus by adjustment and control of the temperature and time of crystallization, and has the advantages of small catalyst loss, low preparation cost and simple operation.

The invention relates to graphene, in particular to graphene and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing a solid organic matter composed ofglucose, citric acid and fructose, with a molten salt composed of sodium chloride, potassium chloride and calcium chloride according to a weight part ratio of 1: 5-100 to obtain a mixture; and heating to 1000-1400 DEG C at a heating rate of 1-10 DEG C/min in an inert gas environment with a flow rate of 100-800 mL/min, carrying out heat preservation for 3-10 h, and carrying out high-temperature thermal polymerization reaction to generate the ultrathin graphene. According to the method, solid organic matters are used as raw materials for synthesizing the graphene, the mixed metal chloride at the molten state at high temperature is used as a solvent, stacking of carbon sheet layers is inhibited, and finally volatilization is performed to generate the ultrathin and ultralight graphene material.

The invention provides a preparation method of stanene powder. The preparation method comprises the following steps: cooling a tin ingot with a content of 99.9 percent to minus 20 degrees, so that the tin ingot can be automatically converted into powder, preparing the tin powder into intercalation tin powder, then preparing the intercalation tin powder into a solid mixture of tin powder and a chemical foaming agent, increasing a gap among the intercalation tin powder by virtue of the two steps, so that the intercalation tin powder can easily form stanene; and then microwave processing the solid mixture of the tin powder and the chemical foaming agent to prepare a single-layer to 30-layer finished product stanene, wherein the thickness of a flake layer is 0.5 to 15 nm, and the size is between 50nm and 4000nm. Therefore, the prepared stanene is moderate and uniform in size; and moreover, the process is simple, the cost is low, the stripping time is short, the yield of the stanene is high, and the mass production is easy to realize.

The invention discloses high-quality graphene, a heat-conducting and electric-conducting epoxy resin composite material thereof and a preparation method of the composite material. The preparation method sequentially comprises the following steps: S1, preparing graphene oxide through an improved Hummers method; S2, performing thermal expansion stripping on the graphene oxide powder obtained in thestep S1 through a muffle furnace to obtain reduced graphene oxide with few lamellas; S3, putting the reduced graphene oxide powder obtained in the step S2 into a high-temperature graphitization furnace for thermal repair; and S4, mixing an epoxy monomer, a curing agent and a curing accelerator, adding the graphene powder obtained in the step S3, performing uniform mixing through a planetary defoaming machine, and performing one-step curing to obtain the composite material. The method has the advantages of being simple in process, high in efficiency, large in yield and capable of achieving macroscopic preparation.

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 of preparing graphene by using supercritical CO2 assisted liquid phase stripping. The method comprises the steps that graphite powder and an organic solvent are evenly mixed and then added into a preheated reaction still, CO2 is introduced into the reaction still, continuous stirring is conducted, and a reaction starts to be conducted after the preset supercritical pressure is reached; and after the reaction is completed, the reaction still is cooled to be the CO2 critical point or below, the CO2 is discharged, a solution is taken out to be subjected to ultrasonic treatment and then centrifuged, then supernate is taken, and thus a graphene solution is obtained. The method is easy to operate, mild in condition and high in product quality, the CO2 is environmentally friendly and low in cost, and the using amount of the organic solvent is small; and therefore, the method is a technology, with actual application prospects, for producing the graphene in industrial and environmentally friendly modes.

The invention discloses a homogeneous C and N co-doped phosphate material as well as a preparation method and application thereof, and belongs to the technical field of electrochemical catalysts. The invention provides a method for preparing a heteroatom-doped material with universality under a low-temperature environment-friendly condition by utilizing a host-guest template method, which specifically comprises the following steps: inserting organic amine serving as a template in the middle of an inorganic layer to quickly prepare a 2D phosphate material on a large scale, and then conducting annealing to obtain a homogeneous C and N co-doped phosphate material. The homogeneous C and N co-doped phosphate material disclosed by the invention has excellent electro-catalytic performance and supercapacitor performance, and can be applied to new energy conversion materials such as electrode materials in metal-air batteries, fuel-cell water-system batteries and the like, and electrochemical energy storage devices such as supercapacitors and the like.