14results about How to "Increased internal surface area" patented technology

The invention provides a nitrogen-doped hierarchical pore carbon material as well as a preparation method and application thereof, and the preparation method comprises the following steps: sequentially dissolving urea, alkali metal hydroxide and / or a pore-forming agent in water to obtain a mixed solution, cooling the mixed solution, adding cellulose-based biomass, and dissolving the cellulose-based biomass to obtain transparent sol; freezing the transparent sol into a solid, and performing vacuum freeze drying to obtain a white loose solid; mixing and grinding the liquid polymeric monomer and the white loose solid, and performing heat treatment to obtain a solid product; and carbonizing the solid product in an inert atmosphere, and then pickling and washing the carbonized product. According to the preparation method, chain-shaped arrangement in cellulose-based biomass molecules is converted into three-dimensional net-shaped arrangement through dissolution, macropores are formed, a macropore framework is kept stable and does not collapse in the carbonization process through polymerization reaction, and the formed hierarchical pore carbon material has a micropore / mesopore / macropore coexisting three-dimensional structure and controllable specific surface area and pore size distribution; meanwhile, in-situ nitrogen doping can also be realized.

The invention discloses a bidirectional spiral streaming high-temperature alloy radiation furnace tube as well as a preparation method and application thereof. The bidirectional spiral streaming high-temperature alloy radiation furnace tube comprises a high-temperature alloy radiation furnace tube of which the inner surface is provided with a clockwise rotating spiral groove and an anticlockwise rotating spiral groove, the diameter of the section of each spiral groove is greater than or equal to 1mm, the distance between the bottom of each spiral groove and the inner diameter of the furnace tube is 0.5-20mm, the distance between the bottom of each spiral groove and the outer surface of the furnace tube is 3-20mm, and the diameter of the section of each spiral groove is greater than or equal to 1mm. The included angle alpha between the centers of the adjacent spiral grooves is larger than 0 degree and smaller than 180 degrees, the spiral angle beta of the spiral grooves ranges from-90 degrees to 90 degrees, and the screw pitch is larger than 3 mm. Through the special inner surface bidirectional spiral structure, the contact area between a medium and the furnace tube is increased, the temperature uniformity in the furnace tube is improved, the heat conduction effect of the furnace tube is enhanced, and obvious pressure drop at the outlet of the furnace tube is avoided.

The invention discloses a hollow cathode assembly, which comprises an emitter, a top pore plate, a heater, a gas-guide tube, an auxiliary electrode and a contact electrode, the touch pole is of a cylindrical structure, one end of the touch pole is combined and fixed with a plate body, the center of the plate body is provided with a through hole, and the emitter, the top hole plate, the heater, the auxiliary pole and the gas-guide tube are coaxially arranged with the touch pole; the gas-guide tube is of a hollow tube body structure and is arranged in the touch holding electrode in a penetrating manner; the top hole plate is combined and fixed at one end, close to the plate body, of the gas-guide tube; a small hole is formed in the center of the top hole plate; the heater wraps the peripheral surface of the gas guide pipe; the emitter is located in the air guide pipe and abuts against the top hole plate, a cavity penetrating through the emitter is formed in the center of the emitter, and the cavity is communicated with the small hole; the auxiliary electrode penetrates through the gas guide tube, one end of the auxiliary electrode is located in the cavity, the cavity is of a conical structure, the inner diameter of an opening in the side close to the top pore plate is smaller than that of an opening in the side away from the top pore plate, discharge current oscillation can be reduced, and the stability of the hollow cathode assembly is improved.

The invention discloses a lithium iron phosphate carbon nanotube composite material and a preparation method thereof, and belongs to the technical field of battery materials. Polydopamine is used as a carbon source to coat lithium iron phosphate, thereby avoiding direct contact between lithium iron phosphate and electrolyte; at the same time, its strong adhesion enhances the compatibility between carbon nanotube composite material and lithium iron phosphate, which is beneficial for the carbon nanotube composite material to be adsorbed on lithium iron phosphate and sintered; the carbon coating layer and carbon nanotube formed by polydopamine are beneficial for the penetration of electrolyte and the exposure of surface active sites; the carbon nanotube composite material introduces metal ions into the carbon nanotube, which not only improves the electrochemical performance of the material, but also supports the carbon nanotube, preventing the carbon nanotube from collapsing during the reaction process, resulting in a decrease in the cyclicity of the material; cobalt is introduced outside the carbon nanotube, which can not only improve the energy density of the battery, but also help stabilize the structure of the carbon nanotube and the positive electrode material, and reduce the degradation of the material.

The present invention relates to an air conditioning refrigeration copper tube bending and forming device, comprising a base frame and a shell frame arranged at the upper end of the base frame, and further comprising: a feeding assembly and a bending and forming assembly, wherein the feeding assembly is installed in the middle of the shell frame, and the feeding assembly is used to gradually convey the copper tube on the material roll to the right, and the bending and forming assembly is installed on the right side inside the shell frame, and the bending and forming assembly is used to accurately bend and wind the cut steel tube. The present invention uses a spiral winding method to bend the copper tube, and the processed copper tube has a spiral structure, so that the inner surface area of ​​the copper tube is increased, the thermal conductivity of the copper tube is improved, and it is beneficial to the energy-saving use of the air conditioner. At the same time, the copper tube after being fully wound has a good material withdrawal effect, which is beneficial to subsequent collection.

The invention discloses a micro-fluidic chip, and an exosome miRNA detection kit and detection method based on the micro-fluidic chip, and belongs to the technical field of micro-fluidic chips. The micro-fluidic chip comprises a substrate and a cover plate, and a mixing channel area, an exosome capture area and an exosome detection area are sequentially connected to the cover plate; the exosome capturing area comprises an exosome capturing area inlet, a capturing area Y-shaped microcolumn array and an exosome capturing area outlet which are sequentially connected from left to right; the exosome detection area comprises an exosome detection area inlet connected with the exosome capture area outlet; an entrance of the exosome detection area is provided with two branches which are respectively connected with the first detection area Y-shaped micro-column array and the second detection area Y-shaped micro-column array. The microfluidic chemiluminescence biosensor based on multiple signal amplification of a Y-type array, HCR reaction and Poly-HRP disclosed by the invention can be used for early detection of breast cancer exosomes miR-21 and miR-155.

The invention discloses a method for producing lubricating base oil from coal liquefaction oil, and belongs to the technical field of coal chemical industry. The method comprises the following steps: firstly, by taking coal liquefaction hydrogenation stabilized oil as raw material oil, fractionating the raw material oil to obtain liquefied oil medium fraction and heavy fraction; mixing the medium fraction and the heavy fraction according to a certain proportion; the obtained mixed fraction is subjected to hydrofining, and a hydrogenation catalyst used in hydrofining is prepared by taking modified Al-SBA-15 as a carrier and loading active metal Mo through an impregnation method; and finally, carrying out hydrodewaxing and product fractionation on the hydrofined material to obtain the product. The acidity and hydrogenation activity of the catalyst can be adjusted by adjusting the preparation conditions of the Al-SBA-15 carrier and the loaded active components, so that the hydrogenation requirements of different liquefied oil fractions can be met. The performance of the lubricating base oil is improved, the service life of the lubricating base oil is prolonged, and the requirement of modern industry for high-quality lubricating oil is met.

The utility model discloses a mortar blending device which comprises a blending device main body, a charging barrel is arranged at one end of the blending device main body, a plugging turntable is rotatably mounted at the top end of the charging barrel, a controller is mounted in the top end of the charging barrel, and the controller is used for controlling the rotation of the plugging turntable; a feeding hole is formed in the top end of the charging barrel, and a feeding pipe is fixed at one end directly facing the feeding hole; a pipe orifice of the feeding pipe is of a star-shaped structure; and by arranging the star-shaped structure, the inner surface area of the star-shaped opening is larger, the friction force between the star-shaped opening and the materials is larger, the falling speed of the materials in unit time is lower, and the discharging amount of the materials can be more accurately controlled.

The utility model belongs to the technical field of roll shafts, and particularly relates to a self-lubricating anti-abrasion type roll shaft sleeve combined structure which comprises a roll shaft body. The interior of the roll shaft body is hollow; a connecting rod is fixedly connected to the interior of the roll shaft body; the middle part of the connecting rod is rotationally connected with a plurality of connecting rings; the connecting rings are distributed in a linear array state; a plurality of fan blades are fixedly connected to the middle part of the connecting ring; the fan blades are distributed in a circumferential array state; a plurality of heat dissipation holes are formed in the end part of the roll shaft body; the heat dissipation holes are distributed in a circumferential array state; the end part of the roll shaft body is fixedly connected with two connecting shafts; through the structure, air circulation can be effectively formed, dissipation of heat in the roll shaft body is accelerated, the temperature of all parts of the roll shaft body is more uniform, thermal deformation caused by local overheating of the roll shaft body is reduced, and the inner surface area of the roll shaft body is increased through the hollow structure in the roll shaft body; and the heat can be more sufficiently transferred into the air.

The application discloses a gradient temperature and pressure reaction kettle for preparing a furfural composite catalyst and a control method thereof, and relates to the technical field of reaction kettles. The gradient temperature and pressure reaction kettle for preparing the furfural composite catalyst comprises a reaction kettle body provided with a feeding pipe and a discharging pipe, and further comprises a vertical pipe rotatably installed in the reaction kettle body, wherein an outer wall of the vertical pipe is provided with a horizontal frame, a plurality of longitudinally arranged stirring rods are installed on the horizontal frame, and an inner heat exchange assembly is arranged in the vertical pipe; a plurality of circumferentially distributed protruding portions are arranged at equal intervals on an inner wall of the reaction kettle body, wherein the two sides of the protruding portions and the inner wall of the reaction kettle body are connected through inclined surfaces; through the arrangement of the cavity and the heat exchange cavity, the raw materials in and outside the reaction kettle body can be heated at the same time, so that the raw materials are heated more uniformly, and the final quality and efficiency of the catalyst are also significantly improved.

The application relates to a hot end assembly and a 3D printer, the hot end assembly comprising a heat dissipation piece and a heat conduction block, a through channel being arranged in the heat conduction block, the through channel being communicated with a feeding port of a nozzle, and printing consumables entering the through channel through the heat dissipation piece; at least one protrusion is arranged in the through channel, the printing consumables enter the nozzle through the protrusion and are extruded through the nozzle. By arranging the protrusion in the through channel, the protrusion can adjust the through channel into a special-shaped through channel or can separate the through channel into multiple sub-through channels, so that the contact area of the printing consumables and the through channel is increased, the heating area of the printing consumables is increased, and then the printing consumables are fully melted, so that the printing speed is improved and the printing flow is increased.

The utility model discloses a thermal relay and a combined structure of the thermal relay and a contactor. A rear cover plate; the penetrating pipes are fixed and arranged on the outer wall face of the rear cover plate in a protruding mode, the rod type terminals are arranged in the penetrating pipes in a penetrating mode, one ends of the rod type terminals are connected with the thermal tripping mechanism, and the other ends of the rod type terminals are located outside the penetrating pipes; the lower buckles are fixedly arranged on the outer wall face of the rear cover plate at intervals, the lower buckles and the penetrating pipes are located at the two ends of the rear cover plate in the length direction respectively, and buckling parts buckled with the ends of the lower buckles are arranged on a shell of the contactor; when the rod type terminal is connected with a wiring terminal of the contactor and the lower buckle is buckled with the buckling part, the penetrating pipe is in contact with the contactor shell, and the penetrating pipe and the lower buckle support the rear cover plate at the same time, so that a connection gap is kept between the rear cover plate and the contactor shell, and the connection gap is used for heat dissipation of the thermal relay. The strength of the connection structure between the combined thermal relay and the contactor is improved, heat dissipation of the thermal relay is facilitated, and action response and reset time of the thermal relay are ensured to accord with set parameters.

The utility model provides a conductive assembly, a cover plate assembly and a battery, and relates to the technical field of batteries. The conductive assembly includes an electrode terminal and a conductive member. The electrode terminal can be electrically connected with the electrode assembly, the electrode terminal penetrates through the first mounting hole and the second mounting hole of the conductive part, and at least part of the electrode terminal can be wrapped by the inner wall of the first mounting hole and the second mounting hole, so that the conductive part can achieve the purpose of protecting the electrode terminal. The inner diameter of the second mounting hole of the conductive piece is larger than the minimum inner diameter of the first mounting hole, so that a stepped hole structure is formed in the conductive piece, and the conductive piece and the electrode terminal are connected more reliably. In addition, the inner surface area of a hole structure formed by the first mounting hole and the second mounting hole can be larger, so that the contact area between the electrode terminal and the first mounting hole and the contact area between the electrode terminal and the second mounting hole can be relatively larger, the conductive part has better overcurrent capacity, and the heat productivity of the conductive assembly can be reduced.

The application provides derived plant-based porous carbon and a preparation method and application thereof. The application uses bean sprout biomass as a precursor of activated carbon electrode material for supercapacitors, effectively improves the uniformity of the prepared activated carbon, and further explores a suitable green preparation method and an electrochemical performance optimization mechanism. Specifically, the application takes green bean sprouts as a representative derived plant as a precursor of activated carbon for supercapacitors, and on this basis, a series of related quality improvement modification work is carried out from two aspects of pore structure adjustment and nitrogen atom doping, provides a reference for high-value utilization of biomass and preparation of activated carbon for supercapacitors, and therefore has good practical application value.