12results about How to "Lower phase transition temperature" patented technology

The invention relates to a memristor based on a molybdenum-doped vanadium dioxide phase change thin film material and a preparation method of the memristor, an amorphous molybdenum-doped vanadium dioxide phase change thin film material is prepared on a Si-based substrate through co-sputtering, annealing is carried out for 30-60 minutes in a high-purity argon atmosphere at 400-450 DEG C, and a high-quality MoxV1-xO2 thin film is obtained. The invention further provides a preparation method of the memristor based on the molybdenum-doped vanadium dioxide phase change film. The memristor structurally comprises a substrate layer, a functional layer and a top electrode layer. The prepared molybdenum-doped vanadium dioxide film shows excellent thermal stability, a wide thermal hysteresis interval and a low phase transition temperature. By using the MoxV1-xO2 material as the functional layer of the memristor, the device has the advantages of small size, low turn-on voltage, high room temperature stability and the like.

The utility model relates to the field of optical fiber communication, and disclose a kind of optical fiber communication device of conference communication system, including shell and optical fiber communication body, shell interior is equipped with optical fiber communication body, shell one side dustproof heat dissipation structure, dustproof heat dissipation structure is equipped with liquid cooling structure in shell, shell is away from dustproof heat dissipation structure and is equipped with a set of equidistant distribution's heat dissipation hole two on the other side of the optical fiber communication body, there is dust screen in shell outside one side with heat dissipation hole two and every heat dissipation hole two is fixedly connected, adopt liquid cooling structure and heat dissipation fan collaborative heat dissipation mode, effectively solved the problem of traditional device heat dissipation capacity, in liquid cooling structure, fatty acid coolant phase transition temperature in heat absorption box is low, can rapidly absorb heat gasification when equipment temperature rises, backflow after cooling liquefaction by condenser pipe, form closed cycle continuous heat dissipation, when temperature exceeds preset value, heat dissipation fan starts, and liquid cooling system collaborative work, accelerate heat conduction and discharge.

The invention relates to the technical field of phase change materials, in particular to a composite phase change material and a preparation method thereof.According to the composite phase change material, a polyhydric alcohol phase change agent with a long carbon chain side chain is synthesized through a click reaction of polyhydric alcohol containing double bonds and long carbon chain mercaptan; a polyhydric alcohol structure in a molecular chain of the phase change agent promotes molecular chain crystallization and phase change latent heat improvement, the phase change agent, polyethylene glycol and amorphous polyhydric alcohol jointly form a polyhydric alcohol system, the polyhydric alcohol system reacts with isocyanate to synthesize a phase change polyurethane elastomer, paraffin with high phase change latent heat is doped, the phase transition temperature of a material can be effectively reduced, and the phase change performance of the material is improved. The tensile strength and the elongation at break are obviously improved, and the surface hardness is obviously reduced, so that the composite phase change material with high phase change latent heat, good mechanical property and low surface hardness is obtained, and the composite phase change material can be better applied as a thermal management interface material.

The present application provides a method and system for recovering waste heat from an organic liquid hydrogen storage process, the method comprising: subjecting the high-temperature gaseous hydrogenation product output from the reaction device to heat exchange with a liquid hydrogen storage carrier having a pressure lower than that required for the hydrogenation reaction, so that the liquid hydrogen storage carrier is heated and vaporized to obtain a gaseous hydrogen storage carrier, pressurizing the gaseous hydrogen storage carrier to make the gaseous hydrogen storage carrier reach the pressure of the hydrogenation reaction, and obtaining a gaseous hydrogen storage carrier that meets the temperature and pressure requirements of the hydrogenation reaction; and inputting the gaseous hydrogen storage carrier and hydrogen that meet the temperature and pressure requirements of the hydrogenation reaction into the reaction device for hydrogenation reaction to obtain a high-temperature gaseous hydrogenation product. The above method can be used to efficiently recover and utilize the waste heat generated during the hydrogen storage process through the designed new system, further enhancing the energy-saving effect of the organic liquid hydrogen storage process.

The present invention discloses a method for converting graphite into diamond under normal pressure. Under relatively low pressure, monodisperse tantalum atoms are deposited on the surface of single-crystal flake graphite, and then annealing is performed to realize the conversion of graphite into diamond under normal pressure. The present invention obtains larger diamonds by using single-crystal flake graphite sheets, and provides a more feasible solution for preparing diamonds based on phase change of graphite under normal pressure. Compared with the high temperature and high pressure method, the present invention can realize the conversion of graphite into diamond under normal pressure, the process is simpler, and the production cost of diamond can be effectively reduced.

The present application relates to the technical field of nanomaterials, and specifically discloses a method for preparing a near-room-temperature vanadium-based nano phase change material. The method includes the steps of pretreatment, grinding, coating treatment and post-treatment, using vanadium pentoxide as a vanadium source, adding tungsten dopants and tin dopants, and coordinating silane coupling agents as dispersants, and adopting wet grinding to obtain a ground wet powder; then the surface of the ground wet powder is coated with a silica gel shell material, and then annealing treatment is performed at 300-720°C to obtain a near-room-temperature vanadium-based nano phase change material. The method of the present application is simple, suitable for large-scale production, and does not require high temperature and high pressure control. The phase change temperature of the obtained near-room-temperature vanadium-based nano phase change material is 25±3°C, and it has excellent stability, high visible light transmittance, and excellent sunlight regulation ability.

The invention discloses a negative-expansion and high-thermal-conductivity electronic packaging material Zn2-xNixP2O7 and a preparation method thereof, and the preparation method comprises the following steps: mixing ZnO, NiO and ammonium salt phosphate according to the chemical formula Zn2-xNixP2O7 to obtain a mixed sample, x being 0.5, 1.0 or 1.5; putting the mixed sample into an agate mortar, adding a grinding additive for grinding, and then drying to obtain a dried sample; putting the dried sample into a muffle furnace, heating from room temperature to 750-950 DEG C at a heating rate of 5 DEG C / min, preserving heat for 2-5 hours, and cooling to room temperature at a cooling rate of 5 DEG C / min to obtain a precursor; and performing wet grinding, drying and tabletting molding on the precursor, putting the precursor into a muffle furnace, heating from room temperature to 850-950 DEG C at a heating rate of 5 DEG C / min, preserving heat for 2-5 hours, and cooling to room temperature at a cooling rate of 5 DEG C / min to obtain a sintered sample. The prepared product has a negative thermal expansion coefficient and relatively high thermal conductivity, can be used as an electronic packaging bottom filler, effectively improves the thermal conductivity of epoxy resin, and reduces the thermal expansion coefficient of the epoxy resin.

This invention belongs to the field of waterborne coating preparation, specifically relating to a waterborne automotive coating and its preparation process. The waterborne automotive coating is prepared through the following steps: preparation of a waterborne dispersion, synthesis of a polyurethane prepolymer waterborne dispersion, synthesis of a waterborne polyurethane dispersion, pre-emulsification, initiation and seed emulsion activation, and mixing. This coating possesses the protective, decorative, and weather-resistant properties of traditional high-end waterborne automotive coatings. It allows the coating to achieve micro-repair after minor scratches by heating or leaving it at room temperature. It exhibits high compatibility with existing automotive painting lines and can dynamically adjust the absorption and reflection of sunlight (especially near-infrared light) according to ambient temperature and sunlight intensity.

This invention discloses a self-controlled in-situ artificial anus, comprising an intestinal tube, a fixing structure, a chassis, a pressure sensor, a self-controlled intestinal switch, and a meter-type control unit. The self-controlled intestinal switch is fixed to the inner wall of the lower end of the intestinal tube. The self-controlled intestinal switch is a cone composed of multiple thin sheets of organometallic composite material, with the apex of the cone facing downwards and the circular base facing upwards. The circular base is fixed to the inner wall of the lower end of the intestinal tube. Each thin sheet of organometallic composite material is fan-shaped. Each thin sheet of organometallic composite material uses medical-grade silicone rubber as a matrix, and nickel-titanium shape memory alloy wire is coiled into a serpentine shape and embedded in the medical-grade silicone rubber matrix. The nickel-titanium shape memory alloy wire is connected in parallel at both ends of the signal transmitter and receiver. This invention is convenient to use, allowing patients to avoid artificial anuses and control defecation independently, eliminating the need for cleaning and care of artificial anal bags, reducing the inconvenience and economic costs of daily life for patients, and the materials used have good biocompatibility and minimal impact on the human body.

The present invention discloses a method for converting vertical graphene into diamond. The present invention adopts a direct current glow discharge plasma chemical vapor deposition method with molybdenum as an electrode to prepare vertical graphene sheets, and then performs annealing treatment in a tube furnace to convert the graphene into diamond. The method for converting vertical graphene into diamond provided by the present invention has very important scientific significance and engineering value for developing a new diamond preparation method.

The present invention provides a rare earth-based fabric with dual functions of heat insulation and warmth preservation, and a preparation method and application thereof, wherein the rare earth-based fabric comprises an A surface and a B surface, wherein the A surface is an emitting heat insulation fiber layer prepared from an emitting heat insulation slurry and a high molecular polymer as raw materials, and the B surface is an absorbing heat fiber layer prepared from an absorbing heat slurry and a high molecular polymer as raw materials; the emitting heat insulation slurry comprises rare earth-doped potassium hexatitanate and titanate, and the absorbing heat slurry comprises vanadium dioxide co-doped with rare earth and tungsten. The dual functions of heat insulation and warmth preservation described in the present invention can adapt to the changes in winter and summer seasons, and can also adapt to the use in various occasions during the day and night, providing the effects of heat insulation and warmth preservation or heat resistance and cooling, and has a wide range of applications.