24results about How to "High aspect ratio" patented technology

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 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 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.

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.

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 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 utility model discloses a guide mechanism of a vibration test bench. The guide mechanism comprises an upper guide mechanism and a lower guide mechanism. The upper guide mechanism comprises a plurality of tension spring guide assemblies and a plate spring guide assembly, each tension spring guide assembly comprises a tension spring body, each plate spring guide assembly comprises a plate spring body, and the lower guide mechanism comprises a guide column. The vibration test bench further comprises a bench body, an inner drive and a moving coil, at least part of the moving coil is located in the bench body and can move in the vertical direction, the moving coil is connected with an upper cover plate of the bench body through plate spring guide assemblies and tension spring guide assemblies which are evenly distributed in the circumferential direction of the moving coil, and the vertically-arranged guide columns are inserted in the inner drive. According to the utility model, the movement direction of the moving coil can be limited, so that the vibration test bench has good lateral ratio, uniformity and frequency response when in use, and the precision of the vibration bench during testing is improved.

The present application relates to a kind of polybenzidine nanofiber and its preparation method, the polybenzidine nanofiber length is 43~67 μm, and the length-diameter ratio is 120~256.Its preparation method is as follows: benzidine is dissolved in solvent, when the system pH value is 3~6, benzidine and hydrogen peroxide occur oxidation polymerization reaction under the catalysis of divalent copper salt to obtain polybenzidine nanofiber.The polybenzidine nanofiber provided by the present application morphology is regular and controllable and has high length-diameter ratio, and conductivity is high, as a kind of semiconductor high polymer material has potential application prospect in battery, supercapacitor.

The invention relates to the technical field of solar cells, and provides a cell electrode printing method, a back contact cell and a photovoltaic module. The method comprises the steps that a screen printing plate is not changed, an N-type auxiliary grid and a P-type auxiliary grid are firstly printed, a main grid is finally printed, main grid printing is a sequence of overlapping and printing the main grid in three working procedures, and a composite electrode structure is formed on the back face of the battery. According to the invention, the step effect of the auxiliary grid printing can be eliminated and the forming uniformity of the main grid can be optimized through the matching of the printing sequence of the first auxiliary grid and the multi-channel main grid, so that the line width of the auxiliary grid is effectively reduced, the height-width ratio is improved by about 3-5%, the unit consumption of silver paste is saved by about 5-10% under the condition that the design line width of the screen printing plate is not changed, and meanwhile, a foundation is laid for 1-3 mu m lower detection of the design line width of the screen printing plate; and the series resistance and electrode shading loss can be effectively reduced.

The invention discloses a lithium battery diaphragm coated with aramid nanofibers and a preparation method of the lithium battery diaphragm, and belongs to the technical field of lithium ion battery materials, the aramid nanofibers with a unique nanoscale structure and excellent mechanical properties and thermal stability are used as a functional coating matrix, zirconium oxide with high hardness and high wear resistance is used as a functional filler, and the lithium battery diaphragm coated with the aramid nanofibers is prepared. A coating design is carried out through a plasma etching technology, and the functionalized lithium battery diaphragm with high safety, high mechanical strength and excellent thermal stability is prepared. The preparation method specifically comprises the following steps: carrying out plasma etching on a PP base membrane, preparing aramid nanofiber dispersion liquid, preparing ANF / ZrO2 / DMSO composite slurry, coating the PP base membrane, carrying out post-treatment and the like, so as to obtain the lithium battery diaphragm. According to the lithium battery diaphragm, the inherent defects of a traditional lithium battery diaphragm in the aspects of thermal safety, mechanical strength, electrolyte wettability and the like can be overcome. The preparation process is simple and controllable, and the obtained functional diaphragm has wide application prospects in the high-end fields of power lithium batteries, energy storage batteries and the like.

This invention relates to the fields of computer vision and intelligent detection technology, and particularly to a method and system for rapid recognition of multi-dimensional features of containers. The invention constructs a bidirectional closed-loop dynamic weighted multi-scale feature pyramid that includes top-down propagation and bottom-up calibration. Through the top-down path, high-level features provide semantic priors indicating the high probability of character presence, guiding shallower networks to focus on container number regions rather than background noise. Combined with dynamic weights, the contrast of characters can be adaptively adjusted under different lighting conditions, solving the problem of character breakage or adhesion caused by uneven lighting in existing technologies. Through the bottom-up calibration path, precise edge information contained in the multi-scale features is fed back to the deep aggregated features, enabling the deep aggregated features to achieve feature aggregation and calibration, thereby improving the positioning accuracy of subsequent detection heads.

This invention provides a small, long-tailed solid rocket motor, comprising a combustion chamber shell, a combustion chamber insulation layer, a propellant charge, an adjusting pad, a long tailed tube shell, a long tailed tube insulation layer, a nozzle shell, a nozzle insulation layer, a graphite throat liner, a plug, an electrode wire plug, a blunt-sensitive igniter, a pressure testing port plug, a connector mounting plate, and a short-circuit head. The propellant charge and adjusting pad are sequentially placed within the combustion chamber. The nozzle shell and long tailed tube shell are screwed together internally and externally. The blunt-sensitive igniter, via the electrode wire plug, connector mounting plate, and short-circuit head, is mounted on the side of the handle rib of the long tailed tube shell to provide short-circuit protection. The long tailed tube shell and combustion chamber shell are then assembled into the complete motor. This invention features high space utilization and minimal change in the center of gravity, resulting in a more rational structural layout.

This invention provides a radio frequency (RF) control method for a plasma cavity, comprising: S1, obtaining the correspondence between the spectral intensity ratio of etching plasma and deposited plasma and the partial pressure ratio of etching gas and deposited gas; S2, at time t1, introducing deposited gas into the plasma cavity, detecting the spectral intensities of the etching gas and deposited gas in the plasma cavity, obtaining the spectral intensity ratio, obtaining the partial pressure ratio according to the correspondence, and feeding a first RF power into the plasma cavity when the partial pressure ratio meets a first threshold; S3, at time t2, introducing etching gas into the plasma cavity, detecting the spectral intensity, obtaining the spectral intensity ratio, obtaining the partial pressure ratio according to the correspondence, and feeding a second RF power into the plasma cavity when the partial pressure ratio meets a second threshold. The method of this invention can clearly define the states of the etching gas and the deposited gas.

A focusing grating device (100) is described, comprising a substrate (402) and a grating comprising a plurality of grating features (408) on the substrate (402). The grating features (408) are positioned non-perpendicularly to the substrate surface, thereby causing a first focusing direction. The substrate (402) is curved, thereby creating a second focusing direction different from the first focusing direction. An X-ray system (300) comprising such a focusing grating device (100) and a method for producing such a focusing grating device (100) are also described.

The utility model relates to the technical field of decorative base paper, in particular to high-wear-resistance decorative base paper which comprises a base paper body, a base layer is arranged at the bottom of the base paper body, a fireproof layer is arranged on the upper side of the base layer, and a reinforcing layer is arranged on the upper side of the fireproof layer. A nano wear-resistant agent and carbon fiber components are added into the first wear-resistant layer, a compact structure is formed on the surface of the paper by adding the nano wear-resistant agent, the carbon fiber and other components, the wear resistance is remarkably improved, alum is adopted as a bridging agent to enhance the fiber bonding degree, and the anionic neutral dispersed rosin size is matched to improve the bonding strength and reduce the paper shrinkage rate. The second wear-resistant layer is a melamine resin coating, and is cured at high temperature after being impregnated with melamine resin to form a hard and scratch-resistant surface layer, so that the overall wear resistance is higher and the service life is longer through the combination of the first wear-resistant layer and the second wear-resistant layer.

This invention proposes a sea urchin-like calcium carbonate core-shell structure phase change energy storage microcapsule and its preparation method, belonging to the field of phase change energy storage materials and microcapsule preparation technology. The method includes the following steps: heating the phase change core material to a molten state, adding deionized water, then adding an emulsifier, and stirring thoroughly to obtain an oil-phase core material emulsion; dissolving calcium salt in deionized water, then adding magnesium salt, and stirring evenly to obtain a magnesium-calcium source suspension; mixing the oil-phase core material emulsion and the magnesium-calcium source suspension, heating, adding carbon source, and continuously stirring; after static aging, washing, and drying, the product is obtained. This invention utilizes the synergistic effect of high-temperature carbonation and ion induction to grow needle-like aragonite crystals in situ on the core material surface, achieving a strong mechanical interlock between the microcapsule and the substrate. This solves the problem that existing calcium carbonate-based phase change microcapsules typically exhibit a smooth calcite crystal form, leading to weak interfacial bonding with building substrates, easy debonding, and consequently weakening the mechanical strength of the composite material.

The application discloses a multifunctional polyvinyl alcohol-based hydrogel and a preparation method and application thereof, and belongs to the technical field of high polymer hydrogel material preparation.The hydrogel takes polyvinyl alcohol (PVA) as a base material, takes polydopamine-coated sea squirt nanocellulose (PDA@TCNCs), beta-glycerophosphate sodium (GP) and phytic acid (PA) as functional components; the mass-volume ratio of PVA, PDA@TCNCs, GP and PA aqueous solutions is 2.62g:0.05g-0.25g:1.0g:4mL-12mL.The hydrogel has excellent mechanical properties, anti-swelling properties and antibacterial properties, and has good biocompatibility, and has wide application prospects in wearable strain sensors, underwater motion monitoring and triboelectric nanogenerators and other fields.

This invention belongs to the field of polyolefin recycling technology and relates to a method for preparing high-quality carbon nanotubes by catalytic carbonization of polyolefins. In this invention, polyolefins are degraded at high temperature to generate small-molecule hydrocarbons. Subsequently, a Ni-Mo-Al catalyst undergoes a reduction reaction to generate elemental nickel. The elemental nickel catalyzes the degradation products to undergo dehydrogenation, cyclization, and aromatization reactions, followed by carbon deposition on the surface of the elemental nickel, which gradually grows into carbon nanotubes. Furthermore, the Ni-Mo-Al catalyst can reduce the formation of amorphous carbon, thereby increasing the activity of elemental nickel and reducing its ability to dissolve carbon, thus preparing carbon nanotubes with smaller diameters and uniform morphology. This invention has the advantages of inexpensive and readily available carbon sources and a simple preparation method, realizing the upgraded chemical recycling of waste polyolefins and the controllable preparation of carbon nanotubes, effectively solving the problem of reusing urban and industrial waste polyolefins.

The application belongs to the technical field of inorganic material preparation, and particularly relates to a high-aspect-ratio lactic acid modified calcium sulfate hemihydrate whisker and a preparation method thereof. Phosphogypsum is added into a lactic acid aqueous solution, heated and stirred, the phosphogypsum is dehydrated in the lactic acid aqueous solution to form calcium sulfate hemihydrate whisker, after the reaction is completed, solid-liquid separation and drying are performed, and the high-aspect-ratio lactic acid modified calcium sulfate hemihydrate whisker is obtained. The calcium sulfate hemihydrate whisker prepared by the application has excellent average aspect ratio, and the surface is modified by lactic acid, so that the dispersibility of the calcium sulfate hemihydrate whisker in polyester is improved.

The invention discloses a synthesis method of a two-dimensional nanosheet SSZ-39 molecular sieve, and belongs to the field of molecular sieve synthesis. The preparation method comprises the following steps: mixing and dissolving an alkali source and water, adding a template agent and a silicon source, continuously stirring until the template agent and the silicon source are completely dissolved, then adding an aluminum source, a seed crystal and a surfactant, and continuously stirring and aging at 25-80 DEG C to obtain alkaline gel; transferring the alkaline gel into a reaction kettle for sealed crystallization, cooling after crystallization is finished, separating mother liquor, centrifugally washing a solid product to be neutral, drying and roasting to obtain the SSZ-39 molecular sieve. The two-dimensional nanosheet SSZ-39 molecular sieve with a high silica-alumina ratio is obtained under the condition that the silica-alumina ratio of initial gel is high, the crystal thickness is within the range of 10-20 nanometers, and diffusion limitation can be effectively reduced. The key of the invention lies in the introduction of the surfactant, so that the synthesized two-dimensional nanosheet SSZ-39 molecular sieve has a relatively high specific surface area, and can be used in the fields of catalytic reduction, gas adsorption and the like.

This invention discloses a TOPCon battery and its fabrication method, belonging to the field of TOPCon battery technology. It includes a monocrystalline silicon wafer with a tunneling layer, a doped polycrystalline silicon layer, a back anti-reflection layer, and a back metal electrode sequentially disposed on its back side from the inside out. The doped polycrystalline silicon layer includes a first doped polycrystalline silicon region and a second doped polycrystalline silicon region. The first doped polycrystalline silicon region is in contact with the back metal electrode and is disposed on the surface of a groove. The tunneling oxide layer is relatively thin, and the inward junction depth is greater than that of the second doped polycrystalline silicon region. This effectively prevents electrode metal from penetrating into the junction region, reduces metal recombination current, and improves the battery's open-circuit voltage. Furthermore, the first doped polycrystalline silicon region has a larger contact area with the printing paste, reducing the battery's contact resistance. Simultaneously, the groove prevents the printing paste from widening outward, ensuring a high grid line aspect ratio, reducing grid line resistance, and thus improving the battery's fill factor.

A method for forming wiring includes: a first exposure step of forming a first resist layer on a main surface of a substrate and exposing the first resist layer with a predetermined wiring pattern; a second exposure step of forming a second resist layer on the exposed first resist layer and exposing the second resist layer with a predetermined wiring pattern; a development step of developing the exposed first resist layer and the exposed second resist layer to generate a resist pattern reflecting the predetermined wiring pattern; and a wiring forming step of forming wiring based on the resist pattern by electroplating.

The application discloses a level conversion circuit with adjustable output swing, and relates to the technical field of integrated circuits, comprising an input inverting buffer module, a level conversion control module and an output driving module. The input inverting buffer module is connected with a signal input end and is used for outputting two internal driving signals with opposite logic; the level conversion control module is used for resetting the level of a gate control voltage by capacitive coupling and a switch tube; and the output driving module comprises a first transmission gate connected between a first level VDDH and a signal output end, and a second transmission gate connected between a second level VDDL and the signal output end. By controlling the opening and closing of the first and second transmission gates, the application realizes flexible and adjustable output swing according to VDDH and VDDL. Without increasing the chip area, the application shortens the switching time of the subsequent circuit, improves the switching rate of the circuit, reduces the power consumption, and is suitable for high-speed and low-power consumption circuits.