36results about How to "Effective control of thickness" patented technology

The invention provides a high-thermal-conductivity metal-based composite material with a graphene-modified interface and a preparation method of the high-thermal-conductivity metal-based composite material. The high-thermal-conductivity metal-based composite material with the graphene-modified interface comprises diamond and graphene-modified metal powder. The preparation method comprises the following steps that 1, annealing reduction is carried out on the metal powder so as to remove oxides on the surface; 2, the metal powder subjected to annealing reduction is coated with a solid carbon source or a gas carbon source, and high-temperature in-situ growth is carried out under the protection of hydrogen atmosphere to obtain graphene-coated metal powder; and 3, the graphene-coated metal powder is mixed with the diamond, and the high-thermal-conductivity metal-based composite material with the graphene-modified interface is prepared through hot-pressing sintering. According to the preparation method, the interface wettability between the metal matrix and the diamond particles is effectively improved, and the thermal resistance of the interface is reduced; and the high-thermal-conductivity graphene is introduced, so that the heat conductivity of the composite material is improved; and the high-thermal-conductivity metal-based composite material can be used as a material for the thermal management of a high-power-density device.

The invention relates to a high-thermal conductivity eggshell type catalyst carrier which is a metal ball, wherein the range of the average particle diameter of the metal ball is 1 to 5 mm, the specific surface area is 70 to 600 m<2>/g, the average pore diameter is 4 to 60 nm, the pore volume is 0.25 to 2.00 cm<3>/g, the thickness of a corrosion layer of the metal ball is 0.05 to 0.25 mm, and the corrosion layer is made of metal oxides. The high-thermal conductivity eggshell type catalyst carrier has the advantages of simplicity in preparation and controllable thickness of a shell layer and is suitable for large-scale industrial production.

The invention discloses a preparation method for an inorganic / organic multilayer composite separator. The method comprises: soaking a separator in an organic solvent, cleaning surface of the separator by using ultrasonic vibration for 15 ~ 30min, drying in an oven, and then cutting the separator into a square separator; placing the above square separator and a target material into a RF (radio frequency) sputtering device; adjusting the air pressure of the RF sputtering device to be 0.1 ~ 1.0Pa, and then feeding in reactant gas, the sputtering power being 5 ~ 80W and the sputtering time being 5 ~ 100min; running the device, so target material plasma bombards gas molecules to form inorganic matter / organic matter which deposit on both sides of the separator to obtain an inorganic / organic multilayer composite separator. By uniformly sputtering one layer or a plurality of layers of inorganic matter / organic matter on the porous separator surface, the dimensional stability of ordinary separators is effectively improved, and the heat resistance of the separator is improved.

The invention discloses a construction method for a proton exchange membrane with a three-dimensional high specific surface area surface, and a high performance membrane electrode based on a proton exchange membrane. The method comprises the following steps: (1) preprocessing the proton exchange membrane; (2) mixing one or multiple types of pore-forming agent and perfluorinated sulfonic acid resinsolution which can be easily removed in water or low-boiling-point solvent, and carrying out ultrasound to form porous-layer slurry; (3) adopting a coating technology to coat one side of the proton exchange membrane layer with the porous-layer slurry to obtain a porous membrane precursor; (4) carrying out acid treatment on the porous membrane precursor, and washing with distilled water to obtainthe porous membrane used for a proton exchange membrane fuel battery. Compared with a commercial proton exchange membrane, the porous membrane prepared with the method has the advantages of regular three-dimensional porous structure and large specific surface area on a premise that membrane thickness is not obviously increased, and the performance of the final prepared membrane electrode of the proton exchange membrane fuel battery is improved.

A method for inhibiting zinc dendritic crystal growth by using a polydopamine film comprises the steps: a zinc foil is soaked in a dopamine solution, and a polydopamine film layer is formed on the surface of zinc by adjusting the concentration of dopamine, the pH value of the solution, the polymerization time and the reaction temperature; the dopamine-modified zinc foil is used as the negative electrode of the secondary battery, and structural characterization after charge-discharge circulation shows that the surface of the electrode is smooth, and no obvious dendritic crystal is generated; and the polydopamine has strong metallophilicity, a stable protective layer is formed on the surface of the zinc foil, and the deposition of zinc is limited in a limited space, so that the growth of zinc dendrites is effectively inhibited, and the cycle life of the zinc negative electrode is prolonged. The method disclosed by the invention is simple in process, easy in reaction condition control, environment-friendly and beneficial to performance optimization and practical application of the zinc negative electrode.

The invention belongs to the technical field of catalysts, and particularly discloses a superacid-coated HZSM-5 molecular sieve catalyst. The catalyst is prepared through the step that the surface of an HZSM-5 molecular sieve is coated with one of superacids including TiO2.H2SO4, ZrO2.H2SO4, TiO2.H2S2O8 and ZrO2.H2S2O8 or a composition of TiO2.H2SO4, ZrO2.H2SO4, TiO2.H2S2O8 and ZrO2.H2S2O8. The invention further discloses a preparation method of the superacid-coated HZSM-5 molecular sieve catalyst and application of the superacid-coated HZSM-5 molecular sieve catalyst in a technology for preparing low carbon olefin from naphtha through catalytic cracking.

The invention relates to a Fe3Si/Al2O3 composite magnetic powder core with a core-shell structure and a preparation method thereof. The technical scheme is as follows: Fe3O4 powder and FeSiAl powder are taken and mixed according to the mass ratio of (2-15):100, and the mixed powder is ball-milled for 4-12h at 100-300rpm to obtain FeSiAl/Fe3O4 core-shell particles; the FeSiAl/Fe3O4 core-shell particles are placed in a high-temperature sintering furnace, heated to 800-1300 DEG C under vacuum I or protective atmosphere I and sintered for 0.5-5h to obtain a sintered body; and the sintered body isplaced in a heat treatment furnace, heated to 500-1200 DEG C under vacuum II or protective atmosphere II and heat-treated for 0.5-5h to obtain a Fe3Si/Al2O3 composite magnetic powder core with a core-shell structure. The Fe3Si/Al2O3 composite magnetic powder core has the characteristics of less loss of raw materials, environment-friendliness, low production cost and simple preparation process. A product made of the Fe3Si/Al2O3 composite magnetic powder core has the advantages of uniform insulating layer, high resistivity, low magnetic loss, high saturation magnetization and low coercivity.

The invention discloses siliconized graphite and a preparation method of the siliconized graphite; the inner part of the siliconized graphite is an ihrigizing graphite layer, and the surface of the siliconized graphite is a siliconizing layer. The siliconized graphite disclosed by the invention has the characteristics of high density, even texture, good electric and thermal conductivity, good heat resistance, good acid-base resistance, high oxidation stability, and good and stable mechanical property. The thickness of the siliconizing layer is 0.5 to 10 mm, and the thickness is controllable; the bonding strength of the siliconizing layer and the ihrigizing graphite layer is high. According to the siliconized graphite and the preparation method disclosed by the invention, siliconizing temperature and siliconizing time can be optimized, the thickness of the siliconizing layer and the ratio of alpha-sic (silicon carbide) and beta-sic can be effectively controlled, and the heat stability of the siliconized graphite is improved.

The invention discloses a backlight FPC board which includes an FPC board and multiple groups of pads arranged in an array along the length direction of the FPC board. The pads are bonded together through a jump wiring process. Each group of pads includes a pole A and a pole K. The jump wiring process is that the K pole of each pad jumps across an adjacent pad and is connected with the pole A of the next pad through a printed line. The invention further presents a backlight half-finished product which includes a light guide plate, an LED component and a backlight FPC board. The backlight FPC board is connected horizontally to the lower end of the light guide plate. The LED component is adhered to the back of the backlight FPC board through SMT. Solder paste is applied between the LED component and the backlight FPC board. The technical scheme can avoid the flash of backlight caused by the elevation of the LED component due to the fact that the lines absorb the solder paste. The loss ofbacklight brightness is reduced because of the high co-linearity, low line resistance and low current loss of LEDs. The thickness of the FPC board can be effectively controlled. The light effect andoptical brightness of the product can reach the best state.

The invention discloses a method for reducing the thickness of a tellurium nanosheet, and belongs to the technical field of nano materials, the method comprises the following steps: soaking the tellurium nanosheet in a weak oxidizing solution, taking out and drying to obtain the tellurium nanosheet with the reduced thickness, according to the method, the weak oxidizing solution and the surface of the tellurium nanosheet are subjected to mild oxidation reaction, the tellurium nanosheet is thinned, and accurate regulation and control of the thickness of the tellurium nanosheet can be achieved; according to the thin-layer tellurium nanosheet prepared by the method disclosed by the invention, the advantages of the p-type tellurium nanosheet can be fully played, the requirements of different devices on material performance are met, electronic and photoelectric devices based on the tellurium nanosheet can be constructed by utilizing electron beam exposure and vacuum evaporation of an electrode material, and the thin-layer tellurium nanosheet has good compatibility with a traditional semiconductor processing technology; according to the invention, multiple regulation and control of the thickness, the carrier concentration and the field effect switching ratio of the tellurium nanosheet can be realized, and support is provided for developing a two-dimensional p-type semiconductor material which is stable in performance and meets multi-scene requirements.

The invention discloses a method for treating high-concentration nitrate wastewater. The method includes the following steps: S1, adding a carbon source and nitrogen and phosphorus nutrients into thenitrate wastewater, and adjusting the pH of the wastewater to 2-4 to obtain pretreated wastewater; and S2, mixing the pretreated wastewater and circulating water, introducing the obtained mixed waterinto an anoxic expanded bed reactor to be in contact with a biological filler, and performing a denitrification reaction to obtain denitrified wastewater, wherein the circulating water is a product obtained by the denitrification reaction of the pretreated wastewater and the biological filler. The cost of treating the nitrate wastewater by using the method is lower, and the method can continuouslytreat the high-concentration nitrate (3000-35000 mg/L) wastewater, and has high treatment efficiency.

The invention discloses ABA-type colloidal particles having multiple properties on the surface and a preparation method of the particles, and belongs to the technical field of preparation of submicron-scale materials. The method uses the colloidal particles as a particle emulsifying agent and a Pickering emulsion liquid water oil three-dimensional interface as a protective interface, in the Pickering emulsion liquid, a monomer is polymerized, phase separation occurs to the interface, a protective film is formed at the near equator-like position of the colloidal particles, the protective film is removed by selective modification or etching, and therefore the colloidal particles having a clear ABA-type partition on the surface and having a dimension of 100-1000 nm can be obtained. The methodprovided by the invention is based on emulsion polymerization, the mass production is easy to realize, the material has strong universality, and the prepared ABA-type colloidal particles have good application value on the aspects of photoelectromagnetic functional materials, medical materials and template materials.

The invention discloses a core-shell structure conductive microsphere with adjustable specific gravity as well as a preparation method and application of the core-shell structure conductive microsphere. The conductive microsphere comprises a ceramic microsphere serving as a core and a metal shell layer coating the surface of the ceramic microsphere. The ceramic microsphere and metallized paste are used as raw materials, and the surface of the ceramic microsphere is coated with the metal shell layer with a certain thickness through a solid-phase sintering method. By adopting the metallization method disclosed by the invention, the bonding strength of the obtained metal shell layer and the surface of the ceramic microsphere core is high, the core-shell structure is compact, the metal shell layer is not easy to fall off, and the diameter of the obtained conductive microsphere with the core-shell structure is adjustable between 1-2000 [mu]m; meanwhile, the overall specific gravity of the core-shell structure microsphere can be adjusted by adjusting the diameter of the ceramic microsphere and the thickness of the coating metal shell layer, so that the conductive microsphere with different use requirements can be obtained; and further electroplating treatment can be carried out on the metal shell layer to improve the conductivity and smoothness of the metal shell layer, so that the application field of the conductive microsphere is widened.

The invention relates to a preparation method of a rare earth-containing high-molecular nanocomposite film. The preparation method comprises the following steps of mixing an anionic polyelectrolyte liquid and a rare earth ionic salt liquid with the same volume and stirring for 12-24 hours to obtain a negatively charged high-molecular rare earth composite nanoparticle liquid; at 10-50 DEG C, placing a pretreated substrate into a cationic polyelectrolyte liquid, standing, cleaning and then placing the substrate into the negatively charged high-molecular rare earth composite nanoparticle liquid, standing, cleaning, circulating in such a manner to obtain the rare earth-containing high-molecular nanocomposite film. The preparation method is simple and is easy to operate and the prepared film has excellent optical property and broad application prospects.

The invention discloses a method for growing a manganese dioxide nano wall film on a conductive substrate which comprises the step of immersing the conductive substrate with a clean surface in a reaction solution prepared from potassium permanganate solution and hydrochloric acid at a temperature of 40 to 100 degrees centigrade, after the reaction, cleaning and drying the product with deionized water. The method is simple, controllable in nano film morphology and dimension, low in cost and low in energy consumption, and the manganese dioxide nano wall supported on the conductive substrate has uniform size and strong adhesion. The prepared MnO2 nanowall film can be used directly as an electrode and is expected to be used in the fields of energy and environment such as catalyst or adsorbent carrier, separation material, magnetic material, oxidative degradation material, desulfurization or air purification material.