72results about How to "High aspect ratio" patented technology

The invention relates to a preparation method of a high-precision gel injection pressureless sintering silicon carbide ceramic water jet cutter sand pipe, which comprises the following steps: pouring premixed liquid into a mold, and curing to obtain a green body; the inner mold is taken out of the cured blank, then the outer mold and the blank are put into a polyethylene glycol solution to be dried, the blank shrinks when being dried in the polyethylene glycol solution, and demolding is completed; drying the demolded green body on drying equipment, and carrying out vacuum heating to obtain a dried green body; and carrying out pressureless sintering on the dried blank to obtain the silicon carbide ceramic water jet cutter sand pipe. The premixed liquid comprises a monomer, a cross-linking agent, a dispersing agent, a defoaming agent, modified silicon carbide powder, a sintering aid and tetramethylammonium hydroxide, and the modified silicon carbide powder comprises graphene composite silicon carbide and modified carbon nanotubes. The water jet cutter sand pipe has the effect of improving the product quality of the prepared water jet cutter sand pipe.

The invention relates to the technical field of photovoltaic cells, and provides copper electrode slurry, a metal electrode, a preparation method of the metal electrode and a photovoltaic cell. The copper electrode slurry comprises a metal composition, a dispersion reducing agent, a composite curing agent and an optional solvent, the metal composition at least comprises copper powder and optional gold powder and / or silver powder; the composite curing agent comprises thermosetting resin and a latent curing agent; wherein the mass ratio of the metal composition to the composite curing agent is (7-30): 1. The copper electrode paste provided by the invention replaces expensive silver paste, so that the manufacturing cost of a solar cell energy electrode is greatly reduced. According to the method for preparing the metal electrode, the position of the copper electrode can be precisely machined, damage to the amorphous silicon layer is avoided, remelting and solidification of the copper electrode are achieved through multiple times of laser scanning, and the problem that the adhesive force between the copper electrode and the substrate is poor is effectively solved.

The invention discloses a high-quality laser welding manufacturing device and a high-quality laser welding manufacturing method, which solve the problems of concentrated energy distribution, small inherent focal depth, insufficient depth-diameter ratio of welding and insufficient welding thickness of the existing ultrafast laser welding technology. The zoom collimation system, the cone mirror, the acousto-optic modulation unit and the long focal depth compression unit are sequentially arranged on a light path where the welding laser is located in the emergent direction of the welding laser. The zoom collimation system is used for changing the spot diameter of the welding laser and collimating the spot diameter; the cone mirror is used for shaping the welding laser subjected to diameter-variable collimation into long-focal-depth laser; the acousto-optic modulation unit divides the long-focal-depth laser into N sub-beams and adjusts the spatial position of each sub-beam, and N is a positive integer greater than or equal to 1; and the long focal depth compression unit is used for adjusting the spot diameter and focal depth length of each sub-beam, so that the focal position and energy of each sub-beam are suitable for laser welding.

The invention provides a crystalline silicon solar cell metal grid line preparation method, a crystalline silicon solar cell and a photovoltaic module, and relates to the technical field of crystalline silicon solar cells. The preparation method comprises the following steps: printing a plurality of first sub-grid lines arranged in rows or columns by using a knotless screen printing plate, and curing to obtain a first target battery piece; and overprinting a second sub-grid line on each first sub-grid line by adopting a full-opening steel plate, curing and sintering. The first sub-grid lines are printed by adopting a knotless screen printing plate, and then the second sub-grid lines are overprinted by adopting a full-opening steel plate, so that the height-width ratio of the metal grid lines can be improved; the second sub-grid line is overprinted by using the full-opening steel plate, so that the shaping of the metal grid line can be assisted, the surface flatness of the metal grid line is optimized, the broken grid is reduced, the contact resistance is reduced, the formation of high-quality ohmic contact is promoted, a better narrow-line-width design space can be obtained, and the consumption of silver is reduced while the shielding of a light absorption area is reduced; and the production cost of the battery is effectively reduced.

The present application relates to the technical field of decorative panels, and specifically discloses a light green fireproof decorative panel and a preparation method thereof. A light green fireproof decorative panel, using polypropylene resin, polyvinyl chloride resin, caffeic acid modified reed straw fiber, shell powder and diatomaceous earth mixed filler modified with aluminum titanium composite coupling agent JTW‑1816 as main raw materials, using bean-based adhesive and MDI adhesive as binders to prepare a light green base material, using ultra-thin fiberboard as a decorative material, and using vinyl chloride copolymer emulsion, bean-based adhesive and MDI adhesive as finishing film materials, to jointly prepare a light green fireproof decorative panel with excellent performance. The light green fireproof decorative panel prepared in the present application has the advantages of being waterproof and moisture-proof, high wear resistance, high bonding strength, good impregnation and peeling performance, resistance to cold and heat cycles, pollution resistance, excellent flame retardant performance, safety and environmental protection.

The invention discloses a preparation method of a self-supporting carbon nanofiber loaded high-spinning Fe monatomic catalyst and application of the self-supporting carbon nanofiber loaded high-spinning Fe monatomic catalyst in a flexible zinc air battery, and the self-supporting carbon nanofiber loaded high-spinning Fe monatomic catalyst (Fe-N4 / NGC-C) is prepared by using an electrostatic spinning technology in combination with a high-temperature pyrolysis strategy; the carbon nanofiber has the advantages of high length-width ratio, large specific surface area, strong stability and the like, can realize uniform distribution of metal Fe monatomic, and inhibits aggregation of electrocatalytic active sites in the carbonization process. According to the preparation method, the atom utilization rate and the conductivity can be improved, and low load and high catalytic performance are realized.

The invention discloses a modified resin composition for a high-pressure-resistant and high-wear-resistant PVC (polyvinyl chloride) hose, and belongs to the technical field of PVC pipes. The sisal fibers are subjected to alkali treatment, impurities are removed and active sites are increased through insertion modification and alkali treatment of the magnesium aluminate spinel fibers, the magnesium aluminate spinel fibers improve the performance of the pipe due to the high length-diameter ratio and other characteristics of the magnesium aluminate spinel fibers, a stable enhanced network structure is formed in a PVC matrix, the surface hardness and wear resistance are improved, the pressure is shared, and the pressure resistance is improved. A bicyclo [2.2. 2] octane structure contained in the long-chain graft modifier disclosed by the invention has rigidity and steric hindrance effect, can uniformly disperse pressure to avoid breakage or excessive deformation of a molecular chain, and is coupled with an amino silane coupling agent to form a three-dimensional structure to improve pressure resistance and wear resistance. After sulfonic groups and a long-chain grafting modifier are introduced to the surfaces of the interspersed modified sisal fibers, the hydrophobic and oleophylic properties of the sisal fibers are improved, the compatibility with PVC is enhanced, agglomeration is avoided, friction is effectively resisted, and the processing fluidity of the material is improved.

The invention relates to the technical field of photovoltaic cells, and provides a solar cell and a preparation method thereof, the solar cell comprises a silicon substrate and a transparent conductive film, the transparent conductive film is provided with a periodic nanostructure array, and the solar cell also comprises a metal electrode arranged on the surface of the transparent conductive film, the metal electrode is prepared by adopting copper electrode slurry and a laser process. The periodic nanostructure array modified layer is prepared on the conductive thin film, so that the surface area and the conductivity of the transparent conductive thin film can be increased, the absorption and reflection of the transparent conductive thin film to light are improved, and the efficiency of the solar cell is improved; and the binding force of the electrode can be increased, and the durability and the stability of the solar cell are improved. According to the preparation method of the solar cell provided by the invention, the position of the copper electrode can be precisely processed, the problem of precision of current silk-screen printing is solved, the damage to the amorphous silicon layer can be avoided, the prepared copper electrode has a relatively large height-width ratio, and the light conversion efficiency can be effectively improved.

The invention relates to the technical field of photovoltaic cells, and provides a laser processing device, a method for preparing a metal electrode and a photovoltaic cell. According to the laser processing system, remelting and solidification are carried out while selective metallization is carried out, the internal stress of the electrode is released while the adhesive force is increased, and the porosity can be effectively reduced; in addition, the technological process can be simplified, the problem that the secondary machining position is difficult to calibrate is solved, and the machining efficiency is improved. According to the method for preparing the metal electrode, the position of the copper electrode can be precisely machined, the problem of precision of current silk-screen printing is solved, damage to the amorphous silicon layer can be avoided, the prepared copper electrode has the large height-width ratio, and the light conversion efficiency can be effectively improved.

The invention belongs to the technical field of synthesis and preparation of aluminum nitride, and discloses a controllable and extensible preparation method of a one-dimensional aluminum nitride nanowire / nanotube, which comprises the following steps: (1) uniformly mixing a solid aluminum source and a solid nitrogen source, transferring the mixture into a rotatable crucible, transferring the crucible into a tubular furnace, sealing the tubular furnace, and carrying out heat preservation for 2-3 hours; vacuumizing and then introducing protective gas; (2) under the condition that protective gas is continuously introduced, the tubular furnace is heated to a preset target temperature for a nitridation reaction, and the nitridation reaction is carried out under the condition that a crucible rotates at a constant rotating speed; and after the reaction is finished, cooling the tubular furnace and stopping the rotation of the crucible to obtain a one-dimensional aluminum nitride nanowire or nanotube product. According to the method, the solid aluminum source and the solid nitrogen source are used as raw materials, and the crucible rotation is introduced during the nitridation reaction to carry out dynamic enabling improvement, so that the single-crystal aluminum nitride nanowire or nanotube with high purity and uniform morphology can be efficiently synthesized.

The invention discloses a small sample-based power transformation equipment infrared spectrum target identification method, which comprises the following steps of: analyzing temperature data from a collected power transformation equipment infrared spectrum, and eliminating abnormal values in the temperature data; mapping the temperature data to an interval of [0, 255] in combination with mapping transformation to generate a grayscale image; performing target detection on the grayscale image based on a Yolov5s algorithm, generating an infrared spectrum rectangular frame and identifying the category of the power transformation equipment; and performing instance segmentation on the infrared spectrum rectangular frame by using a Yoract + + algorithm, separating the power transformation equipment from the image background, and marking different parts of the power transformation equipment. According to the method, a method of combining target detection and instance segmentation is adopted, on the basis of ensuring the accuracy, the real-time performance of target identification is improved, the time and energy of detection personnel for post-processing the infrared spectrum are saved, and reliable operation of power transformation equipment is ensured.

The embodiment of the present application provides a silicon wafer processing method and device. The silicon wafer processing method includes: polishing the silicon wafer to remove the damaged layer on the surface of the silicon wafer; providing a reaction gas, wherein the reaction gas includes at least oxygen and a halogen-containing gas; at a first preset temperature, using the oxygen and the halogen-containing gas to react with the surface of the silicon wafer to form a micro-suede surface on the surface of the silicon wafer, and removing metal impurities from the silicon wafer. The embodiment of the present application can reduce the consumption of chemicals and water resources, reduce the impact of the silicon wafer micro-suede manufacturing process on the environment, avoid damage to the silicon wafer and its micro-suede, and is also conducive to the formation of a microstructure with higher coverage and higher aspect ratio, so as to enhance the light trapping effect of the micro-suede surface and improve the quality of the micro-suede surface. Moreover, the metal impurities on the surface of the silicon wafer can also be removed, thereby improving the purity of the silicon wafer.

The utility model provides a simple and convenient device for improving the accuracy of a sandstone aggregate alkali activity experiment. The simple and convenient device comprises an outer curing barrel, an inner curing barrel, a partition plate and a plurality of test piece boxes, the outer maintenance barrel and the inner maintenance barrel are both made of corrosion-resistant and high-temperature-resistant materials, the inner maintenance barrel is arranged in the outer maintenance barrel, a maintenance water storage cavity is formed between the outer maintenance barrel and the inner maintenance barrel, and barrel covers are arranged on the tops of the outer maintenance barrel and the inner maintenance barrel respectively; the interior of the inner curing cylinder is divided into at least two independent chambers by partition plates, the chambers are used for placing the test piece boxes, and the inner curing cylinder is further used for containing an alkaline solution; the liquid level of the curing water in the curing water storage cavity is higher than the liquid level of the alkaline solution in the inner curing barrel; the test piece boxes are put into different bins in groups, and the test piece boxes are mortar rod molds. The device solves the problems of gravity interference and temperature difference interference.

The invention relates to the field of high polymer materials, in particular to a heat-conducting pressure-resistant polyolefin pipe and a preparation method thereof. The heat-conducting pressure-resistant polyolefin pipe comprises the following components in parts by weight: 100 parts of polypropylene; 10 parts of HDPE (High Density Polyethylene); 2 to 10 parts of a boron nitride nanosheet MOF composite material; 3 to 15 parts by weight; the preparation method of the boron nitride nanosheet MOF composite material comprises the following steps: S1, preparing MOF from zinc nitrate hexahydrate and 2-methylimidazole; s2, enabling the MOF to react with boric acid, and then enabling the MOF to react with the boric acid, so as to obtain the boron nitride nanosheet MOF composite material. The boron nitride nanosheet MOF composite material is added into the polyolefin matrix, so that the heat-conducting property is remarkably improved. The boron nitride nanosheet MOF composite material has excellent heat-conducting property and high length-diameter ratio, and can form an effective heat-conducting network in a polymer matrix. According to the invention, by optimizing the variety and content of the filler, the heat-conducting property can be improved, and relatively good mechanical properties can be maintained at the same time.

The invention discloses a method for preparing a mullite whisker adsorbing material through co-sintering, and relates to a structure and preparation of mullite whiskers and application of the mullite whiskers in printing and dyeing wastewater. The mullite whiskers are prepared by introducing a MoO3-NH4F composite co-sintering system and a one-step co-sintering method, and the adsorption material is low in preparation cost, simple in preparation process and free of pollution in the process. Under a strong alkaline condition, the adsorption rate on a methylene blue (MB) solution reaches 93.48%, and the adsorption capacity is 11.685 mg / g.

The invention discloses a light-weight lithium battery diaphragm with high heat resistance and high wettability and a preparation method thereof.The light-weight lithium battery diaphragm with high heat resistance and high wettability comprises a base membrane and a coating on the base membrane, and the coating comprises porous aluminum oxide, carboxymethylated nanocellulose, acetylated nanocellulose, polyurethane, sodium hexametaphosphate and ammonium polyacrylate; the porous aluminum oxide, the carboxymethylated nanocellulose, the acetylated nanocellulose, the polyurethane, the sodium hexametaphosphate and the ammonium polyacrylate cooperate to improve the liquid absorption rate, the liquid retention rate, the peel strength, the ionic conductivity, the heat resistance and the wettability of the diaphragm, and meanwhile, the water content of the diaphragm is reduced. The density of the porous aluminum oxide, the carboxymethylated nanocellulose and the acetylated nanocellulose is relatively low, so that the diaphragm is light in weight.

The invention provides tear-resistant aramid nano insulation paper as well as a preparation method and application thereof. The tear-resistant aramid nano insulation paper is prepared from multi-scale compounded meta-aramid chopped fibers with high elongation and good rigidity and para-aramid nanofibers with a unique nanoscale structure, rich functional groups and excellent mechanical properties through secondary forming and hot pressing. The excellent film-forming property of the para-aramid nanofibers and the advantage that rich functional groups on the surfaces of the para-aramid nanofibers and the meta-aramid chopped fibers can easily generate a strong network cross-linked structure are fully exerted, and the novel aramid paper-based insulating material with high tearability and high dielectric strength is developed. The defects of stress concentration damage, poor dielectric strength and the like caused by easy tearing of the existing aramid nano insulation paper are overcome, and the aramid nano insulation paper can be used as an ultrathin insulation layer to be applied to the next generation of highly lightweight and integrated special electrical equipment to realize miniaturization, integration and structural weight reduction of the equipment.

The invention discloses a wafer-level preparation method of a tungsten trioxide nanosheet hydrogen sensing layer material, which comprises the following steps: forming an amorphous tungsten trioxide film through magnetron reactive sputtering, enabling the substance tungsten trioxide in the amorphous tungsten trioxide film to be in an amorphous state, and enabling the amorphous tungsten trioxide film to have higher surface energy and reaction activity at the moment; only the target material WO3 is used during magnetron reactive sputtering, impurities are prevented from being introduced into the amorphous tungsten trioxide film, hydrochloric acid is adopted for etching the amorphous tungsten trioxide film, the amorphous tungsten trioxide is subjected to hydration reaction at the moment, stable hydrated tungsten trioxide is generated, and then the amorphous tungsten trioxide film is prepared. Carrying out self-assembly on the hydrated tungsten trioxide to form a hydrated WO3 nanosheet porous film, namely a tungsten trioxide nanosheet; the method has the advantages that large-scale and uniform production of tungsten trioxide nanosheet hydrogen sensing layer materials with rich nanostructures, high chemical purity and specific crystal phases can be realized, and wafer-level preparation can be realized.

The invention discloses a preparation method of a bio-based high-transparency high-impact PVB adhesive film, and belongs to the technical field of PVB adhesive films, transparent squid bone nanofibers are adopted for filling, triethylene glycol di-2-ethylhexoate is adopted for plastification, and when the mass of PVB resin powder is 100%, and the addition amount of the squid bone nanofibers is smaller than 1 wt%, the light transmittance of the prepared film is still 85% or above, and the light transmittance of the film is not higher than 85%. And when the addition amount of the squid bone nanofibers is 0.5 wt%, the tensile strength is increased to 16.2 + / -0.55 MPa, and is increased by 28.3% compared with pure PVB (Polyvinyl Butyral). According to the obtained high-strength PVB adhesive film, the biogenic transparent squid bone nanofibers are added into plasticized PVB for filling, and the high-strength PVB adhesive film is formed through double-screw melt extrusion tape casting, so that the comprehensive performance is obviously improved, and the impact strength is obviously improved compared with that of an unmodified PVB adhesive film on the basis of keeping good transparency.

The present application relates to the technical field of fiber reinforced composites, in particular to a fiber reinforced resin matrix composite material with damping and impact resistance performance, and a preparation method and application thereof. The present application prepares mixed particles (RC) of carbon nanotube co-embedded rubber particles (R) through a ball milling process; then the RC particles are anchored on high aspect ratio nanofibril fibers (ANFs) through a deprotonation process to construct ARC hybrid damping particles with a "necklace" structure; finally, the ARC particles are uniformly distributed on the surface of the fiber prepreg by spraying process, and the composite material is obtained by hot pressing. The present application uses ANFs as a space carrier for nanomaterials, solving the problem of easy agglomeration and difficult dispersion of nanomaterials, significantly improving the damping capacity and impact damage resistance of the carbon fiber composite material while maintaining its high stiffness, and is suitable for wind turbine blades and aerospace skin and other scenes with strict requirements for vibration suppression.

This invention relates to a method and device for fabricating high aspect ratio metal gratings. It includes: providing a support substrate and an intermediate substrate; fabricating an intermediate substrate mask layer on the intermediate substrate and patterning the prepared intermediate substrate mask layer; etching the intermediate substrate using the intermediate substrate mask layer and the patterned window of the intermediate substrate mask layer to obtain a metal deposition window after etching; removing the intermediate substrate mask layer and performing metal deposition on the intermediate substrate to obtain grating metal pillars filling the metal deposition window, wherein the lower end of the grating metal pillars is in contact with a metal seed layer; removing the intermediate substrate, adhesive layer, and support substrate to obtain a metal seed layer and a plurality of grating metal pillars supported on the metal seed layer. This invention can effectively fabricate high aspect ratio metal gratings, is compatible with existing processes, and improves the fabrication efficiency and process stability of metal gratings.

A laser-weldable high-blackness halogen-free flame-retardant glass fiber reinforced PA6 material and a preparation method thereof, the material comprises the following components in percentage by mass: PA6 resin 26.9-45.4%, glass fiber 25-35%, halogen-free flame retardant 16-18%, laser penetrant A 10-20%, laser penetrant B 3-5%, antioxidant 0.1-0.3%, lubricant 0.5-0.6%, flow agent 0.4-0.6%, toner 0.2-2%; PA6 resin, two laser penetrants, and toner are put into a high-mixer, and then an auxiliary agent is added to obtain a mixed main material A, and the mixed main material A is put into the main feeding hopper of a twin-screw extruder; the halogen-free flame retardant and glass fiber are respectively added to the weight-loss feeding hoppers of the second heating zone and the fourth heating zone; the extruded material strip is cooled, pelletized, and dried to obtain a finished product. The preparation process is green, simple, and low-cost, and the obtained PA6 material has high strength and high laser transmittance.

The invention discloses slurry and a preparation method thereof, an electrode and a battery. The slurry comprises conductive powder, a thermosetting component, a curing agent and a mixed solvent, and the mixed solvent comprises two or more solvents with different wettability and different boiling points. By selecting and combining two or more solvents with different wettability and different boiling points, the shaping performance of the slurry can be enhanced. According to the optimized solvent combination, when the paste is printed to a solar cell, the line type can be kept full, and collapse is avoided, so that the aspect ratio exceeding 0.5 is realized.

The invention relates to the technical field of gas sensors, and discloses a gas sensitive material, a preparation method thereof, a gas sensor and application, the preparation method of the gas sensitive material comprises the following steps: (1) mixing polyvinylpyrrolidone, polyacrylonitrile, MoS2 and N, N-dimethylformamide to obtain a spinning solution; (2) performing electrostatic spinning on the spinning solution to obtain a nanofiber membrane; (3) carrying out in-situ synthesis on SnO2 nanoparticles on the nanofiber membrane by adopting a solvothermal method; and (4) carrying out pre-oxidation treatment on the SnO2-loaded nanofiber membrane, and then calcining. The gas-sensitive material prepared by the method not only combines SnO2 and MoS2 which have high recognition ability to gas, but also combines CNFs (carbon nanofibers) which have high conductivity, high aspect ratio, large specific surface area and high stability, and the gas-sensitive material well maintains the structure of the carbon nanofibers, so that the gas-sensitive material has good application prospects. The gas-sensitive material has relatively high gas-sensitive performance and good selectivity and repeatability stability on hydrogen.

This invention discloses a CuBDC nanosheet, its preparation method, and its applications. The CuBDC nanosheet is a single-layer two-dimensional CuBDC nanosheet material; the aspect ratio of the CuBDC nanosheet is 80–400. The CuBDC nanosheet is single-layered, possessing a high aspect ratio and a large specific surface area. The preparation method is simple, the material is inexpensive and readily available, resulting in low cost and ease of mass production. The CuBDC nanosheet is suitable for gas storage, adsorption separation, heterogeneous catalysis, electrochemistry, and analytical applications.

The present invention discloses a conductive paste for solar cells, comprising conductive metal powder, glass powder, and an organic carrier; wherein the organic carrier comprises a thermoplastic polymer, vinyl silicone oil, a polymerization inhibitor, other organic additives, and an organic solvent. By using vinyl silicone oil instead of traditional silicone oil and adding a proper amount of polymerization inhibitor, the photovoltaic conversion efficiency of the solar cell can be improved by increasing the height-to-width ratio of the grid lines formed and reducing the undulation of the grid lines, and the stability of the conductive silver paste can also be maintained.

The present invention is applicable to the field of display technology, and provides an active backlight LED light source board driven by an a-Si TFT device, a backlight module and a display device, each light-emitting unit of the light source board includes a light-emitting element and a driving thin film transistor for driving the light-emitting element, the first drain and the first source of the driving thin film transistor are both strip-shaped and spirally distributed, the first drain is distributed between the first source and forms a strip-shaped and spirally distributed gap with the first source, and the first active layer forms a strip-shaped and spirally distributed channel corresponding to the gap to increase the width of the channel. The present invention designs the first drain and the first source to be strip-shaped and spirally distributed to form a strip-shaped and spirally distributed channel, and the spiral channel can significantly improve the width-to-length ratio of the channel and improve its driving ability, so that the driving thin film transistor allows a larger driving current to pass through, meeting the driving current requirements for use as a backlight.

The invention relates to the technical field of photovoltaic electronic paste, in particular to solar cell fine grid paste and a preparation method and application thereof. The fine grid slurry comprises the following components: metal powder, glass powder, an organic carrier, a plasticizer and an organic auxiliary agent, the addition amount of the metal powder in the fine grid slurry is 80-95 wt%, the metal powder comprises nano silver powder and micron silver powder, and the weight ratio of the nano silver powder to the micron silver powder is 1: (3-10). The fine grid slurry can be smoothly printed when the opening of a full-opening steel plate is designed to be 10 microns, the problem of poor material spreading caused by the mirror surface of the full-opening steel plate is solved, the viscosity of the fine grid slurry is improved, and meanwhile the ink penetration effect of the fine grid slurry can be effectively reduced.

The application relates to the technical field of aluminum oxide, in particular to an aluminum oxide nanowire / nanorod as well as a preparation method and application thereof. The length-diameter ratio of the aluminum oxide nanowire / nanorod is greater than or equal to 10, and the specific surface area is greater than or equal to 200 m 2 / g. The content of five-coordinated Al 3+ defect sites in the aluminum oxide nanowire / nanorod is greater than or equal to 1.95 mmol / g, and the proportion is greater than or equal to 10%. The aluminum oxide nanowire / nanorod provided by the application has a high density of unsaturated coordination aluminum species (five-coordinated Al 3+ ), and can be widely applied to the fields of petroleum chemical industry and fine chemical industry, in particular, to the fields of catalyst carrier, gas-liquid adsorption, solid-phase filler and sewage treatment agent.

The invention discloses a mechanical arm and a connector clamping device, and belongs to the technical field of mechanical arms, the mechanical arm comprises a clamping jaw air cylinder, the execution end of the clamping jaw air cylinder is connected with a clamp, the outer side wall of the clamping jaw air cylinder is further provided with limiting pieces in pairs, the two limiting pieces are oppositely arranged, and the opposite faces of the limiting pieces are provided with two protruding protection plates and protruding columns; the protruding column is located between the two protection plates, the two limiting pieces define a cavity, the cavity is divided into two limiting cavities by the two protruding columns, the clamps are installed in the corresponding limiting cavities in a sliding fit mode and can slide left and right relative to the limiting pieces, limiting screws are further installed on the protection plates, and the clamping ends of the clamps are located below the limiting cavities. And a plurality of positioning teeth which are arranged at intervals are arranged at the bottom of the clamping end of one clip. The clamp has the beneficial effects that the movement of the clamp has double constraints, and the linear precision of the movement of the clamp is improved, so that the clamp is longer and smaller in size, can have a higher length-width ratio, and can be used in a use environment with a narrow space and a smaller product.