41results about How to "Good charge storage performance" patented technology

There is provided an information storage apparatus including recording medium and a head. The recording medium has an electrode layer, a magnetic layer that is stacked on the electrode layer, and a wear-resistant thin film that is stacked on the magnetic layer. The head has a conductive probe for injecting charge to record information and sensing the charge injected into the recording medium to reproduce information in a state that the conductive probe contacts the recording medium. A magnetic medium, which is coated with a wear-resistant thin film, stores charges to record information and reproduce information using an electrostatic force. Thus, it is possible to stably store highly integrated information. Also, a probe contacts a recording medium to record and reproduce information at a high speed. Thus, sensitivity and resolution can be improved.

The present invention relates to a preparation process of a phosphorus-and-nitrogen-doped graphene porous carbon composite material. The preparation process comprises the following steps: (1) hydrothermal reaction: dissolving a nitrogen source into deionized water, adding a graphene oxide solution and performing ultrasound for a pre-set time, adding a phosphorus source and performing ultrasound for a pre-set time to obtain a mixed solution, and then transferring the mixed solution to a high pressure reactor and performing the hydrothermal reaction to obtain a hydrogel, wherein the nitrogen source is one or more of aromatic polyamines, and the phosphorus source is phosphoric acid or phosphate; (2) oxidative polymerization: adding the hydrogel in step (1) into a ferric chloride solution after the hydrogel is cooled, and sealing and standing the mixed solution under a predetermined temperature for a pre-set time to obtain a composite hydrogel; and (3) carbonization activation. The preparation method has the advantages of simplicity, low cost and high production efficiency, no pollutants generate, and the prepared phosphorus-and-nitrogen-doped graphene porous carbon composite materialhas excellent specific capacitance value, high cycle stability, high energy density and excellent electrochemical performance when the material is applied to super capacitor electrodes.

The present invention discloses a nano-fiber thin-membrane filter material preparation method and a product thereof. The method comprises the following steps: an organic piezoelectric material or an organic electrostatic adsorption material is used as a matrix material; the matrix material is mixed with an inorganic piezoelectric material or an electrostatic adsorption nano-material and a solvent;stirring at a preset temperature is used to dissolve the organic piezoelectric material or the organic electrostatic adsorption material, so that the inorganic piezoelectric material or electrostaticadsorption nano-material is uniformly dispersed to obtain a spinning solution having a viscosity; an electrostatic spinning method is used to obtain the spinning solution for spinning; a substrate isused to receive electrostatic-spun nano-fibers to form a nano-fiber thin membrane; and the nano-fiber thin membrane is subjected to annealing, polarizing, cutting, and material repolarizing to obtainthe nano-fiber thin-membrane filter material. Compared with traditional electrostatic adsorption materials, the nano-fiber thin-membrane filter material has stronger adsorption force on impurities and particles under high flow speed and high wind speed scenes, has better filtering effects, and is suitable for air purification, anti-fog masks, industrial exhaust gas, automobile exhaust gas treatment and other high-flow-speed scenes.

The invention discloses a polytetrafluoroethylene-polypropylene composite electret air filtering material and a preparation method thereof. The polytetrafluoroethylene-polypropylene composite electret air filtering material comprises, by weight, 40-50 parts of polypropylene, 20-30 parts of polytetrafluoroethylene suspended fine powder, 7-13 parts of silicon monoxide, 11-17 parts of powdered activated carbon, 2-4 parts of 3-aminopropyl triethoxy silane coupling agent, 0.6-1.7 parts of glacial acetic acid, an appropriate amount of deionized water, 1-3 parts of low-density polyethylene wax, 0.8-2 parts of antioxidants 1010, 0.8-1.5 parts of titanate coupling agent and 1-3 parts of sodium chloride. Silicon nano-wires containing alpha-quartz are prepared and added into melt-blown polypropylene electret materials, the air filtering material has quite high electret charge stability and excellent filtering efficiency, the activated carbon is used for loading the silicon nano-wires treated by the silane coupling agent, the loading capacity of the activated carbon for the silicon nano-wires is improved, and adsorption of the filtering material for harmful substances in air is effectively improved.

The invention discloses a dendritic electrostatic spinning/electret composite nanofiber membrane filter material. The material is composed of the following raw materials of, by weight, 75 to 90 parts of polythioetherimide, 7 to 13 parts of silicon monoxide, 10 to 16 parts of powdered activated carbon, 2 to 3 parts of a 3-aminopropyltriethoxysilane coupling agent, 0.8 to 2 parts of glacial acetic acid, a proper amount of deionized water, 4 to 7 parts of metatitanic acid, a proper amount of a 0.6 mol/L AgNO3 solution, a proper amount of N-methyl pyrrolidone, 0.5 to 2 parts of dibutyl phthalate and 1 to 3 parts of tetra-n-propylammonium chloride. Silicon nanowires containing alpha-quartz are prepared, the electrostatic spinning/electret composite fiber filter material is prepared through the electrostatic spinning technique and has the excellent electric charge storage performance, and the filter efficiency of the filter material is greatly improved. In addition, nano-silver is added, nano-titanium dioxide is loaded, the antibacterial endurance property of the filter material is improved, and the long-time high-efficiency filter effect is achieved.

The invention discloses a preparation method of a nanometer nickel protoxide-nickel-silicon alloy lithium ion battery negative electrode material and belongs to the technical field of preparing lithium ion battery electrode material. The feature of the lithium battery negative electrode material is that the lithium battery negative electrode material has a highly-ordered micro-nano silicon micro-channel substrate, and an excellent conductive NiSi layer electric charge collecting layer, and a NiO nanometer active layer has large specific surface area and an electrode orderly porous channel is suitable for an electrolyte solution to immerge. The preparation method of the battery cathode material is highly compatible with a traditional integrated circuit manufacturing process, and mainly comprises three main processes of etching to form the highly-ordered micro-nano silicon micro-channel substrate by using a photoinduced low temperature electrochemical pulse voltage wet method, depositing metallic nickel via an electroless plating process and rapid thermal annealing and oxidizing. The highly-ordered three-dimensional micro-nano porous NiO/Si-MCP (nickel protoxide/ silicon microchannel) negative electrode material has excellent physical and electrochemical support for immerging the electrolyte, transporting charges and embedding and de-embedding lithium ions, and could be used for preparing the integratable lithium ion battery electrode material.

The invention discloses a gelatin/polyetherimide compound electret fiber filtration material prepared through electrostatic spinning. The gelatin/polyetherimide compound electret fiber filtration material is prepared from, by weight, 65-80 parts of polyetherimide, 10-18 parts of gelatin, 6-11 parts of silicon oxide, 9-16 parts of powdery activated carbon, 1-3 parts of 3-aminopropyl triethoxy silane coupling agent, 0.8-2 parts of glacial acetic acid, a proper amount of ionized water, 3-6 parts of metatitanic acid, 0.6 mol/L AgNO3 solution, a proper amount of N-methylpyrrolidone and 0.8-2 parts of acetic acid. Alpha-quartz-containing silicon nanowires are prepared by adopting the material, the gelatin/polyetherimide compound electret fiber filtration material is prepared through an electrostatic spinning technology and has excellent charge storage stability, and the filtering efficiency of the filtration material is greatly improved. In addition, nano silver is added and nano titanium dioxide is loaded to improve the antimicrobial persistence performance of the filtration material and to achieve a long-term and efficient filtration effect.

The invention discloses a high-temperature-resistant melt-blown polypropylene compound electret air filtration material. The high-temperature-resistant melt-blown polypropylene compound electret air filtration material is prepared from, by weight, 50-60 parts of polypropylene, 9-13 parts of silicon monoxide, 12-17 parts of powdery activated carbon, 2-6 parts of 3-aminopropyl triethoxy silane coupling agent, 0.5-2 parts of glacial acetic acid, a proper amount of deionized water, 1-3 parts of low-density polyethylene wax, 0.8-1.7 parts of antioxidant 1010, 0.7-1.3 parts of titanate coupling agent, 4-7 parts of silicon dioxide, 2-4 parts of boric acid and 1-4 parts of barium oxide. Silicon nanowires containing alpha-quartz are prepared and are added to the melt-blown polypropylene compound electret material, the material has excellent filtration efficiency and further has an obvious bacterial reproduction inhibiting function. The activated carbon supported silicon nanowires treated by the silane coupling agent are used, the silicon nanowire supporting capability of activated carbon is improved, and the adsorption capability of the filtration material to the harmful substances in the air is improved effectively.

The invention discloses a preparation method of a porous sponge-like carbon-based Li3VO4/g-C3N4/MoXC nanoelectrode material. The method comprises dissolving lithium acetate, ammonium vanadate and citric acid in deionized water, and perforing stirring and clarification in a 40- 55 DEG C water bath condition, then adding that mixed solution of acetic acid containing PVP and ethanol, stirring to homogeneity and transparency; Then adding a small amount of g-C3N4 power, strongly stirring until uniformly disper to obtain a spinning solution; Electrospinning was carried out, precursor fibers were collected, and the resulting product was calcinated at 400-500 DEG C, puting the product into phosphomolybdic acid solution for impregnation, and then put the product into tubular furnace to be heated at700-1000 DEG C for 4-6 hours. The electrode is porous, and the active specific surface area of the electrode for electrochemical reaction is greatly increased, so that the real current density of theelectrode is greatly reduced, so that the energy loss of the battery is greatly reduced, and the performance of the battery is significantly improved.

The invention discloses a method for preparing three-dimensional graphene by adopting ethyl cellulose as the raw material. The method comprises the steps that analytically pure ethyl cellulose and NaOH are dissolved in ethyl alcohol according to the molar ratio of 1 to 1-3 to form sol, aging is conducted on the obtained sol for 12 h to obtain gel, and the gel is dried at 80 DEG C for 6 h to obtain dried gel; carbonization is conducted on the obtained dried gel in an argon atmosphere at the temperature ranging from 700 DEG C to 1000 DEG C, a carbonized product is washed through deionized water till PH of a solution ranges from 6.8 to 7.2, suction filtration is conducted on the solution, a product is obtained, the product is dried for 5 h at 60 DEG C, and the product three-dimensional graphene is obtained. The method for preparing the three-dimensional graphene takes the ethyl cellulose as the raw material, the three-dimensional graphene is prepared by adopting a sol-gel method, the raw material of the reaction is easy to obtain, the cost is low, process equipment is simple, and energy consumption is low.

The invention discloses a vinyl polysiloxane-containing electrostatic spinning and electret composite fiber filter material. The material is prepared from 30-45 parts of polyetherimide, 45-55 parts of vinyl polysiloxane, 6-10 parts of silicon monoxide, 8-15 parts of powdered activated carbon, 1-2 parts of 3-aminopropyltriethoxysilane coupling reagent, 0.8-2 parts of glacial acetic acid, a proper amount of deionized water, 2-6 parts of metatitanic acid, a proper amount of 0.6 mol/L of AgNO3 solution, a proper amount of N-methyl pyrrolidone, 0.5-1 part of sodium chloride and 15-30 parts of methylbenzene. Alpha-quartz-containing silicon nanowires are prepared, and the electrostatic spinning and electret composite fiber filter material is prepared by the electrostatic spinning technology; the filter material has the advantages of being small in aperture, high in poriness, low in air friction and the like, has excellent charge storage stability performance, and improves the filter efficiency of the filter material; the antibacterial durability of the filter material is improved and a long-term efficient filtration effect is achieved.

The invention discloses a washing-resistant polypropylene hybridized electret air filter material. The material is prepared from, by weight, 50-60 parts of polypropylene, 8-12 parts of silicon monoxide, 10-16 parts of powdered activated carbon, 2-5 parts of 3-aminopropyl triethoxy silane coupling agent, 0.5-1.5 parts of glacial acetic acid, an appropriate amount of deionized water, 1-3 parts of low-density polyethylene wax, 0.5-2 parts of an antioxidant 1010, 0.8-1.5 parts of a titanate coupling agent, 1-2 parts of TMP-2000 and 3-6 parts of chopped glass fibers. By addition of alpha-quartz containing silicon nanowires into a melt-blown polypropylene electret material, remarkable filter efficiency is achieved, and an evident bacterial reproduction inhibiting function is realized. By adoption of activated carbon for loading the silicon nanowires treated by the silane coupling agent, silicon nanowire load capacity of the activated carbon is increased, and adsorption of the filter material to harmful substances in air can be effectively improved.

The invention discloses a long-acting electret air filtration material with anti-corrosion and anti-mildew effects. The long-acting electret air filtration material with the anti-corrosion and anti-mildew effects comprises the following raw material components: 50-60 parts of polypropylene, 7-13 parts of silicon monoxide, 12-15 parts of powdered active carbon, 1-4 parts of a 3-aminopropyltriethoxysilane coupling agent, 0.6-1.4 parts of glacial acetic acid, a proper amount of deionized water, 1-3 parts of low-density polyethylene wax, 0.6-2 parts of an antioxidant 1010, 0.7-1.3 parts of a titanate coupling agent, 4-9 parts of sorbic acid, 5-11 parts of malic acid and 3-6 parts of 8-quinolinol copper. Through the long-acting electret air filtration material with the anti-corrosion and anti-mildew effects, silicon nanowires containing alpha-quartz are prepared and are added into a melt-blown polypropylene electret material, so that the electret material has excellent filtration efficiency and also has a function of obviously inhibiting bacterial reproduction; the silicon nanowires treated by the silane coupling agent are loaded by active carbon; the silicon nanowire loading capacity of the active carbon can be improved; the adsorption of the filtration material to harmful substances in the air can be effectively improved.