37results about How to "Prevent restacking" patented technology

The invention discloses a surface nano-nickel particle modified graphene nano material and a preparation method of the nano material, belonging to the field of nano material preparation technology. The preparation method can be used for preparing surface nano-nickel particle modified graphene by the steps of preparation of graphite oxide, preparation of graphene oxide and pretreatment. According to the invention, the surface nano-nickel particle modified graphene is prepared by a chemical plating method, so that the particle size and the crystal form of surface nano-nickel particles can be effectively controlled, and the graphene oxide part can be reduced when metal particles are deposited; and graphene sheet layers are prevented from being stacked again by the deposition of nickel particles on the surface of the graphene; and the graphene has excellent soft magnetism so as to be magnetized under the minimal additional magnetic field.

The invention discloses a graphene/silicon dioxide/nano zero-valent iron composite as well as a preparation method and application thereof. The preparation method comprises the following steps: after the graphene oxide is subjected to ultrasonic dispersion, adding tetraethyl orthosilicate, drying after magnetic stirring is carried out completely, introducing nitrogen in a tubular furnace for calcination, adding deionized water into the solids obtained through calcination, after ultrasonic dispersion, introducing nitrogen and adding ferrous sulfate heptahydrate, after uniform stirring, and adding a reducing agent for reducing so as to obtain black flocculent precipitates after complete reaction, washing, carrying out suction filtration, drying, grinding and screening through a sieve so as to obtain the graphene/silicon dioxide/nano zero-valent iron composite. The graphene/silicon dioxide/nano zero-valent iron composite prepared according to the preparation method can be applied to the field of water pollution control as an adsorbent, particularly adsorption removal of arsenic pollutants in waste water, and has the advantages of simple and convenient preparation process, high adsorption speed and the like, and in addition, the required raw materials are wide in source, low in cost and high in practical application value.

The invention discloses a ternary multilevel multi-dimensional structure composite material and a preparation method thereof. The excellent electrochemical comprehensive performance can be exerted by utilizing the remarkable synergistic effect and unique multilevel multi-dimensional structure. The composite material is formed by TiO2 of a low-dimensional nano structure and second-phase high-specific-capacity metal oxide as well as two-dimensional micrometer (x-y plane direction) high-conductivity plain graphene. Drive force for lowering the total surface free energy of the solution system is utilized to uniformly load and compactly combine TiO2 of the nano structure and high-specific-capacity metal oxide to an exposed surface of the plain graphene nanosheet by virtue of a tetrahydrofuran solution mixing method. The ternary multilevel multi-dimensional structure composite material effectively integrates the remarkable function of each ingredient, including excellent circulating property and outstanding safety of TiO2, high specific capacity of the second-phase metal oxide, and good conductivity of the plain graphene.

The present invention relates to a method for producing delaminated/exfoliated non-ionic inorganic materials, to such materials and their use as additives.

The invention discloses a three-dimensional porous structure silicon/graphene composite negative electrode material and a preparation method thereof. The preparation method comprises the following steps: (1) uniformly dispersing nanometer silicon into a mixed solution of ethyl alcohol and water so as to obtain a solution A; (2) adding carboxymethylcellulose and an organic carbon source into the solution A, obtaining a solution B after uniform mixing, and adjusting pH value until the solution B is alkali; (3) mixing the alkali solution B and an oxidized graphene solution, and after ultrasonic dispersion, stirring uniformly to obtain a solution C; (4) after putting the solution C into liquid nitrogen for freezing, and then carrying out freeze drying treatment to obtain solid D; and (5) putting the solid D into an argon atmosphere, and carrying out warming, sintering and cooling to obtain the three-dimensional porous structure silicon/graphene composite negative electrode material. The volume effect of silicon in the charging and discharging process can be effectively accommodated, the electrical conductivity is good, and the material has excellent charging and discharging cycle performance and rate capability and high first columbic efficiency.

The invention provides high-performance printable ink. The high-performance printable ink is prepared from carbon quantum dots, graphene oxide, a surfactant and a solvent, wherein the carbon quantum dots and graphene oxide have a stronger synergistic effect and can effectively improve overall performance of the material. According to the mixed ink prepared by modifying graphene oxide with the carbon quantum dots, the carbon quantum dots as spacers between graphene oxide layers effectively prevent graphene oxide from stacking again, and meanwhile, the carbon quantum dots generally contain moreoxygen-containing functional groups and open edges and provide more reaction sites for pseudocapacitance, so that a carbon quantum dot/graphene oxide mixed electrode shows better electrochemical capacity and cyclic stability as compared with single carbon quantum dot electrode or single graphene oxide electrode.

The invention discloses a method for preparing a steel structure aqueous corrosion-resistant fireproof coating material and relates to a coating preparation method. The method comprises the followingsteps: establishing a melamine and phytic acid flame-retardant layer from molybdenum diselenide (MoSe2) nanosheets by using a layer-by-layer self-assembling method (LBL), and filling an aqueous epoxyresin with the functionalized molybdenum diselenide nanosheets, so as to obtain a steel structure aqueous corrosion-resistant fireproof coating. By adopting the method, the P-N system flame-retardantlayer is prepared, so that the flame retardancy of the aqueous epoxy resin can be improved; the phytic acid in the nano packing has great chelation potential energy, so that the coating can be connected in a relatively intense mode through the phytic acid, and the corrosion resistance and the durability of the coating can be improved; the problem that a nano particle is liable to aggregate becauseof the high surface energy can be also solved.

The invention discloses an in-situ self-assembled nano-flower-like cobalt disulfide/rGO composite material and a preparation method and an application thereof. The in-situ self-assembled nano-flower-like cobalt disulfide/rGO composite material is obtained through steps that by adding GO solution to mixed solution of soluble cobalt salt solution and vulcanizing agent solution, and after stirring, ultrasonically, the obtained GO mixed solution is reacted in a stainless steel kettle at 150-280 DEG C, after cooling with the furnace, and the solid is obtained by freezing-drying treatment after suction filtration. The composite material has a nano-flower-like three-dimensional microstructure, nanoflowers are composed of single crystals of cobalt disulfide and grow in situ on a two-dimensional rGO nano sheet substrate, the substrate can effectively accommodate the volume effect of cobalt disulfide during charging and discharging and has good electrical conductivity, moreover, the composite material has excellent charging and discharging cycle performance and rate capability and can be applied in the field of lithium ion battery cathode materials.

The invention relates to an MXene composite material based electrochemical actuator and a preparation method and application thereof. The MXene composite material based electrochemical actuator comprises two electrode layers and an electrolyte layer, wherein the electrolyte layer is clamped between the two electrode layers to form a sandwich structure; the two electrode layers comprise MXene. TheMXene composite material based electrochemical actuator provided by the invention shows excellent actuation performance, and has the characteristics of large bending deformation, low driving voltage,high response speed, good stability, capability of realizing response to frequency and the like; the MXene composite material based electrochemical actuator can be used as bionic equipment, and can beused as a mechanical claw to realize grabbing of articles, imitate vibration of insect wings, swing of leaves, opening and closing of flowers and the like. In addition, the preparation process of theMXene composite material based electrochemical actuator is simple, and complex equipment is not needed.

The invention discloses an electrostatic self-assembly three-dimensional flower-like cobalt disulfide/MXene composite material and a preparation method and application thereof. The composite materialis prepared by the following steps: stirring a soluble cobalt salt aqueous solution and a vulcanizing agent aqueous solution to obtain a mixed solution, carrying out hydrothermal reaction on the mixedsolution at 150-280 DEG C, performing cooling along with a furnace, carrying out suction filtration, and carrying out drying to obtain a solid A; adding the solid A into a polydiallyldimethylammoniumchloride solution, performing stirring, and performing washing to obtain a solid B; putting the solid B into an MXene aqueous solution, performing stirring, performing standing, carrying out centrifugal washing, and carrying out freeze drying to obtain a solid C; and under the protection of nitrogen, calcining the solid C at 500-700 DEG C to obtain the composite material. The composite material is self-assembled on an MXene nanosheet substrate through electrostatic interaction, the substrate can effectively accommodate the volume effect of cobalt disulfide in the charging and discharging process, and the composite material has excellent charging and discharging cycle performances, rate capability and high initial coulombic efficiency.

The invention relates to the technical field of nanometer materials, in particular to a copper pyrovanadate/nitrogen-doped graphene composite material and a preparation method thereof and an application thereof in a lithium ion battery. Graphene oxide, PVP, organic amines, Cu salt and a vanadium source are mixed and dispersed in water in a certain proportion and copper pyrovanadate/nitrogen dopedgraphene composite material with three-dimensional mesoporous structure is synthesized by hydrothermal method in one step. By changing the type and amount of vanadate, the growth of copper pyrovanadate on the surface of graphene oxide is regulated, the composite material not only combines the advantages of graphene and copper pyrovanadate, but also greatly overcomes the respective shortcomings ofgraphene and copper pyrovanadate, effectively improves the conductivity of the composite material, can alleviate the volume change in the charge and discharge process, has good electrochemical performance, and can be used as the negative electrode material of lithium battery. The preparation method of the invention is simple, high efficiency and low cost, and can realize a large number of preparation.

The invention discloses a preparation method of a graphene/poly(1,3,6,8-tetrathiophenepyrene) nano-scroll composite material. The method comprises the steps: mixing poly(1,3,6,8-tetrathiophenepyrene) and oxidized graphene, and preparing a nano-scroll structure through in-situ reduction, wherein the nano-scroll structure can serve as an electrode material of a supercapacitor. The invention relates to the preparation of the graphene/poly(1,3,6,8-tetrathiophenepyrene) nano-scroll composite material. The material serves as the electrode material of the supercapacitor, so a higher specific capacitance value can be obtained. The method is simple, and the working state is stable and reliable, so the method is worthy of being discloses and protected.

The invention discloses an electrostatic self-assembly spherical molybdenum trioxide/MXene composite material as well as a preparation method and application thereof. The composite material is prepared by the following steps: dissolving soluble molybdenum acetylacetonate in ethanol, stirring to obtain a mixed solution, carrying out solvothermal reaction at 150-280 DEG C, cooling along with a furnace, washing, filtering, drying, and calcining at 400-600 DEG C to obtain a solid A; adding the solid A into a polydiallyldimethylammonium chloride solution, stirring, and centrifugally washing to obtain a solid B; dropwise adding an MXene aqueous solution into the solid B aqueous solution, stirring, standing, carrying out centrifugal washing, and carrying out freeze drying to obtain a solid C; andunder the protection of nitrogen, calcining the solid C at 400-600 DEG C to obtain the material. The composite material is self-assembled on an MXene nanosheet matrix through electrostatic interaction, the matrix can effectively accommodate the volume effect of molybdenum trioxide in the charging and discharging process, and the composite material has excellent charging and discharging cycle performance, rate capability and high initial coulombic efficiency.

The invention discloses an alumina-modified graphene lithium ion battery anode material and a preparation method thereof, which belong to the technical field of lithium ion battery anode materials. The alumina-modified graphene lithium ion battery anode material consists of the following raw materials: nano-silicon powder, carbon fibers, graphene, carbon nanotubes, ethylene carbonate, alumina andpolyacrylic acid; and the lithium ion battery anode material is prepared by steps such as ultrasonic treatment, magnetic stirring, microwave treatment and high-temperature calcination. According to the invention, by means of a reinforcing system composed of ethylene carbonate, alumina and polyacrylic acid, the lithium intercalation capacity, lithium deintercalation capacity, initial coulombic efficiency and cycle performance of the alumina-modified graphene lithium ion battery anode material are increased.

The invention provides a preparation method of a graphene/graphite lithium ion battery anode material. The preparation method is characterized by comprising the following steps: (1) adding graphite oxide into deionized water, and performing ultrasonic treatment for 20-60 min; centrifuging obtained suspension for 20-60 min at the condition of 1,500-3,000 rpm; after the centrifugation, removing supernatant with impurities not stripped at the bottom to obtain graphene oxide colloid; (2) mixing a graphene oxide colloid solution obtained in the step (1) with an expanding agent, adding a graphite electrode material, and stirring and drying to obtain a graphene oxide/graphite material; (3) performing microwave heating on the graphene oxide/graphite material obtained in the step (2) in an inert atmosphere to obtain the graphene/graphite lithium ion battery anode material. The preparation method provided by the invention has the advantages of simple technology, short path and low cost; the obtained lithium battery anode material has great specific capacity and high cyclic stability.