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762results about How to "Good electrical conductivity" patented technology

Graphene composite titanium dioxide photocatalyst capable of magnetic separation and recovery, and preparation method thereof

The present invention relates to a graphene composite titanium dioxide photocatalyst capable of magnetic separation and recovery, and a preparation method thereof. The photocatalyst is synthesized by a two-step hydrothermal method, wherein graphene and magnetic particles are compounded to prepare magnetic graphene, the magnetic graphene is compounded with titanium dioxide nanoparticles synthesized by a hydrothermal method to prepare the three-element composite photocatalyst. The photocatalyst comprises three parts of the graphene, the titanium dioxide, and the magnetic nanoparticles, wherein the magnetic nanoparticles are loaded on the graphene lamellas to form the magnetic graphene having large specific surface area and magnetism, the rutile type titanium dioxide has a three-dimensional ordered nanostructure, and is loaded on the magnetic graphene lamellas to form the graphene composite rutile type titanium dioxide photocatalyst with the characteristic of magnetic separation, whereinthe photocatalyst has the large specific surface area, the nanoparticles have the magnetism, the photocatalyst can be separated and recovered, and has the efficient catalytic performance.
Owner:ZHEJIANG UNIV

Tungsten trioxide/polyaniline core-shell nanowire array radiochromic film and preparation method thereof

The invention provides a tungsten trioxide/polyaniline core-shell nanowire array radiochromic film and a preparation method thereof. The preparation method comprises the following steps: dissolving white tungstic acid in aqueous hydrogen peroxide liquor to prepare peroxide tungstate liquor; coating the peroxide tungstate liquor on an electric conductive face of a clean electric conductive substrate; dissolving tungstate in alcohol to form precursor liquor, fixing the electric conductive substrate in a reaction kettle, adding the precursor liquor into the reaction kettle, carrying out a reaction at 150-250 DEG C for 8-16 hours, and taking out and carrying out thermal treatment at 300-450 DEG C for 1-3 hours to obtain a tungsten trioxide nanowire array; and mixing aniline and dilute sulphuric acid to form electrolyte for preparing polyaniline and carrying out electro-polymerization on polyaniline to obtain the tungsten trioxide/polyaniline core-shell nanowire array radiochromic film. The preparation process is convenient to control, lower in preparation cost and easy to realize industrialization. The film has the advantages of large spectrum adjustment range, abundant radiochromic types, high coloring efficiency, fast response speed, long cycle life and the like.
Owner:ZHEJIANG UNIV

Method for preparing hetero-atom doped porous carbon material through carbonation of biomass under assistance of molten salt

The invention provides a method for preparing a hetero-atom doped porous carbon material through carbonation of biomass under the assistance of molten salt. The method comprises the following steps: uniformly mixing biomass powder, the molten salt and a hetero-atom doped compound to obtain a product A, wherein the molten salt contains LiCl and KCl, the mass of LiCl accounts for 59 percent of that of the molten salt, and the mass of KCl accounts for 59 percent of that of the molten salt; putting the product A in a pipe furnace; carrying out high-temperature calcination; cleaning with distilled water to remove the molten salt and obtain the final product, namely the hetero-atom doped porous carbon material. The method has the advantages that the biomass is taken as a raw material, and the molten salt containing hetero-atoms is taken as a carbonization medium, so that the hetero-atoms can be introduced into the skeleton of the carbon material during the pyrolysis and carbonization process of the biomass synchronously and controllably, and the hetero-atom in-situ doped porous carbon material is obtained finally. Compared with the conventional doping method, the method provided by the invention have the advantages that the steps are simple; the cost is low; the operation is easy; the reactant purity is high; the application prospect is relatively good.
Owner:HARBIN ENG UNIV

Composite conductive fiber with coaxial three-element, and preparation method thereof.

The present invention relates to a composite conductive fiber with coaxial three-element, and a preparation method thereof. The composite conductive fiber comprises a core layer of polyurethane fiber, an intermediate layer of carbon nano-tube, and an outer layer of intrinsic conducting polymer, wherein the three layers of the composite conductive fiber are coaxial. The preparation method comprises comprises: (1) preparing pretreated polyurethane fiber; (2) immersing the pretreated polyurethane fiber in a organic solvent reaction bath containing the carbon nano-tube to carry out a process to obtain a two-element composite fiber of carbon nano-tube/polyurethane; (3) immersing the two-element composite fiber of carbon nano-tube/polyurethane in a intrinsic conductive polymer monomer solution,then adding an oxidizing agent solution in a dropwise manner, carrying out a washing and drying for the resulting solution after complete reacting to obtain the composite conductive fiber with coaxial three-element. The composite conductive fiber provided by the present invention has advantages of good conductive effect, high elasticity, soft hand feeling, simple preparation technology and low input cost of equipment, and is applicable for large scale production and large scale application.
Owner:DONGHUA UNIV

Transition metal sulfide coated with carbon, preparation method and application

A transition metal sulfide coated with carbon, a preparation method and an application relate to transition metal sulfide. The transition metal sulfide coated with the carbon comprises a nucleus and a coating layer on the surface of the nucleus, wherein the nucleus is a transition metal sulfide nucleus, and the coating layer is a carbon coating layer. The preparation method comprises the steps as follows: dissolving the transition metal sulfide in water, adding a carbon source, and coating the surface of the transition metal sulfide with carbon. The transition metal sulfide coated with the carbon is applied to preparation of an electrode material, and the electrode material could be a battery electrode material or the like, and is specifically used as an electrode active material to be applied in a secondary battery. The transition metal sulfide coated with the carbon is greatly improved in conductive performance, further improved in charge and discharge capacity and rate capability, greatly improved in coulombic efficiency and cycle performance, and low in material cost and simple in preparation process. The composite material used as an electrode material of a secondary lithium battery has high energy density, excellent cyclicity, and especially excellent rate capability, and is safe and reliable.
Owner:XIAMEN UNIV

Phase-change microsphere as well as preparation method and application thereof

The invention discloses a phase-change microsphere as well as a preparation method and application thereof. The phase-change microsphere is mainly composed of an aerogel microsphere and a phase-changematerial, wherein the aerogel microsphere has a three-dimensional porous network structure; the phase-change material is uniformly distributed in the three-dimensional porous network structure. The preparation method comprises the following steps: taking the aerogel microsphere as a template; immersing the aerogel microsphere into the molten-state phase-change material; melting and filling, and cooling and curing to obtain the phase-change microsphere. The phase-change microsphere disclosed by the invention has unique electric properties, resistance sudden changes, adjustable resistance, highheat enthalpy and good circulating stability; the phase-change microsphere has high sensitivity on heat when being applied to a hot flow stabilizer; the phase-change microsphere can have the resistance sudden changes by utilizing extremely low heat, so that a circuit is protected; the phase-change microsphere can have excellent heat sensitivity and resistance sudden change performance in high-frequency current, low-frequency current, constant current and alternating current/constant current cross-varying circuits and has a great application prospect.
Owner:SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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