25results about How to "Lower phase transition temperature" patented technology

The invention discloses a low-temperature early-strength cement slurry system based on a cellulose-based composite phase change material, and belongs to the field of oil and gas field well cementation. The preparation method of the composite phase change material comprises the following steps: adding pretreated waste paper fibers, a cross-linking agent and a heat conduction material into an alkali / urea solution, and putting the mixture into an ultrasonic cleaning instrument to obtain a mixture A; transferring to a dialysis bag, and soaking in deionized water to obtain a mixture B; and performing in-situ mixing on the mixture C and organic phase change material molecules to obtain a mixture C, and performing vacuum freeze drying. The low-temperature early-strength cement slurry system is prepared from the following components in parts by weight: 100 parts of cement, 0.3-1 part of a composite phase change material, 5-25 parts of a density reducing material, 0.1-0.8 part of an early strength agent, 0.2-1 part of a dispersing agent, 0.2-2 parts of a fluid loss agent, 0.01-0.5 part of a defoaming agent and 44-58 parts of water. While cement hydration heat release is regulated and controlled, the early compressive strength of the cement can be improved, and the operation time efficiency and the construction safety are improved.

The invention provides a VO2 thermally induced phase change material-based dual-band intelligent window, a film and a preparation method thereof, and the dual-band intelligent window sequentially comprises X-coated VO2 core-shell particles, a visible light-to-infrared light transparent substrate and a visible light-to-infrared light reflection substrate from top to bottom; the X-coated VO2 core-shell particles are core-shell structure particle materials with visible light to infrared light transparent cores X inside and VO2-doped shell layers outside, and the X-coated VO2 core-shell particles are laid on a visible light to infrared light transparent substrate. The X-coated VO2 core-shell particles and the visible light-to-infrared light transparent substrate form a photonic crystal film, and the photonic crystal film is provided with a detachable visible light-to-infrared light reflection substrate. Compared with the prior art, the method has the advantages that (1) the sunlight modulation capability of a traditional VO2 intelligent window is improved; (2) the sunlight and infrared dual-band adjustable intelligent window is obtained; and (3) intelligent window devices with different phase change temperatures can be obtained so as to adapt to energy-saving regulation and control requirements of buildings in different regions.

The invention discloses an inorganic salt phase change material as well as a preparation method and application thereof. The inorganic salt phase change material composition comprises the following components in percentage by weight: 80.0%-94.0% of inorganic hydrated salt, 4.0%-10.0% of a temperature regulator, 1.0%-5.0% of a nucleating agent, 0.5%-2.0% of an auxiliary nucleating agent and 0.5%-3.0% of a thickening agent, wherein the temperature regulator is selected from at least one of polyhydric alcohols. The temperature regulator is added, the content of each component in the inorganic salt phase change material composition is selected to be within a proper range, in a system of the inorganic salt phase change material, the polyhydric alcohol of the temperature regulator can form a hydrogen bond with the inorganic hydrated salt, and in addition, the polyhydric alcohol can serve as a solute and a solvent to achieve the dual functions of the solute and the solvent; when the content of the inorganic salt phase-change material is 4-10%, the inorganic salt phase-change material can be solvated, so that the overall phase-change temperature of the inorganic salt phase-change material is reduced, and the inorganic salt phase-change material has good phase-change stability in the frequent melting-crystallization phase-change process.

The invention provides a refrigeration material, a preparation method and a refrigerator, the refrigeration material is NixTi100-x, x is 50.6-58.0, and the refrigeration material NixTi100-x comprises austenite (B2 phase) coarse grains and a nanometer precipitated phase. According to the method, the Ni-rich NiTi alloy with the nano precipitated phase (the atomic weight ratio of Ni is 50.6%-58.0%) is used for refrigeration, the supersaturated Ni can effectively reduce the phase transition temperature and broaden the lower limit of a hyperelastic temperature zone, the nano precipitated phase can strengthen austenite coarse grains (increase the high-temperature yield strength of the austenite coarse grains), the upper limit of the hyperelastic temperature zone of the material is improved, and the super-elastic temperature zone of the material is improved. The alloy material can have superelasticity at least in a temperature range of 203K to 503K (a temperature span of 300K in total); benefited from large latent heat generated by phase change of the coarse grain # imgabs0 #, temperature change of 5K-33.6 K can be generated during adiabatic compression deformation of the coarse grain # imgabs0 #; wherein the temperature zones with the adiabatic temperature drop amplitude larger than or equal to 10K and larger than or equal to 20K can reach 200K and 110K respectively.

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 invention provides a rare-earth-based fabric with double functions of heat insulation and warm keeping and a preparation method and application thereof.The rare-earth-based fabric comprises a face A and a face B. The face A is an emission heat-insulation fiber layer prepared from emission heat-insulation slurry and a high-molecular polymer. The surface B is a heat-absorbing fiber layer prepared from heat-absorbing slurry and a high-molecular polymer as raw materials; the emission heat insulation slurry comprises rare earth doped potassium hexatitanate and titanate, and the heat absorption slurry comprises rare earth and tungsten co-doped vanadium dioxide. The fabric with the double functions of heat insulation and warm keeping can adapt to changes in winter and summer, can also adapt to various occasions such as daytime and night, has the effects of heat insulation and warm keeping or heat resistance and cooling, and is wide in application range.

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 discloses a method for synchronously regulating and controlling the optical frequency dielectric property and the phase transition temperature of a vanadium oxide film, and aims to solve the technical problems that in a process for preparing a VO2 film by using a magnetron sputtering technology, the composition of a VOx mixed phase is very sensitive to oxygen flow, and the stability of the VO2 film preparation process is poor. The regulation method comprises the following steps: 1, ultrasonically cleaning the substrate; 2, cleaning a metal target material; thirdly, the V metal target material is connected with a direct-current power source, and the W metal target material is connected with a radio-frequency power source; 4, vacuumizing; 5, heating the substrate; 6, performing luminance build-up; seventhly, the target material is subjected to pre-sputtering treatment; 8, controlling the oxygen flow to enable the coating state to be in a poisoning mode, and performing film deposition; 9, cooling; 10, vacuumizing in an annealing furnace; and 11, annealing treatment. By introducing W atoms, the crystal structure and the energy band structure of VO2 are regulated and controlled, and meanwhile, the electronegativity of W and V elements and the difference of atomic radiuses are fully utilized, so that synchronous regulation and control of microcosmic electron polarization response and optical frequency dielectric characteristics are realized.

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 invention discloses a constant-temperature composite phase change cold storage agent and application thereof. The constant-temperature composite phase change cold storage agent is prepared from the following components: water, NH4Cl, NaNO3, TiO2 and curdlan. The content of each component is as follows in percentage by mass: 15% of NH4Cl, 35%-9% of NaNO, 0.05%-0.15% of TiO2, 0.5%-1.5% of curdlan and the balance of water. The phase change latent heat of the constant-temperature composite phase change cold storage agent is 247.20 J / g, the phase change temperature is-25.08 DEG C, the supercooling degree is 0.4 DEG C, and no phase separation phenomenon is found after repeated freezing and thawing. The constant-temperature composite phase change cold storage agent is low in phase change temperature, high in phase change latent heat, small in supercooling degree and free of phase separation, and the constant-temperature process is achieved in the mode that the cold storage agent is combined with a fresh-keeping box.

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 invention belongs to the technical field of medicinal chemistry, and particularly relates to a triglyceride-derived ionizable lipid compound, a preparation method thereof, a drug delivery carrier and application. The chemical structural formula of the ionizable lipid compound derived from triglyceride is as shown in a formula (I): # imgabs0 # formula (I). The ionizable lipid compound has the advantages of being high in degradability, high in safety, beneficial to release of carried nucleic acid drugs and the like, and a drug delivery carrier containing the compound has the excellent performance of being good in in-vivo targeting, high in biological safety, high in mRNA expression efficiency and the like. Targeted organs and tissues of the drug delivery carrier containing the compound comprise tumors, heart, liver, spleen, lung, kidney and the like.

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 relates to a wire material component for electric arc additive manufacturing of a marine transmission component and an additive manufacturing process of the wire material component, and belongs to the technical field of low-alloy high-strength steel wire material forming, and the wire material is composed of less than or equal to 0.04 wt% of C, 0.80-1.20 wt% of Mn, 0.20-0.40 wt% of Si, 0.90-1.20 wt% of Cr, 2.60-3.00 wt% of Ni, 0.20-0.40 wt% of Mo, 0.20-0.40 wt% of Cu, less than or equal to 0.010 wt% of S, less than or equal to 0.010 wt% of P and the balance Fe. According to the components and performance requirements of the marine transmission component, an alloy system and the content of all elements of the marine transmission component are determined, and the marine low-alloy high-strength steel transmission component meeting the use performance requirements is manufactured by adopting a gas metal arc welding deposition mode and optimizing deposition process parameters.

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.

The invention discloses an adjustable terahertz metamaterial band elimination filter, and belongs to the technical field of terahertz metamaterials, and the adjustable terahertz metamaterial band elimination filter comprises a plurality of unit structures which are periodically arranged; each unit structure comprises a top layer, a dielectric layer and a bottom layer which are sequentially arranged from top to bottom; the central points of the top layer, the dielectric layer and the bottom layer are positioned on the same straight line; the top layer and the bottom layer are both metal-vanadium dioxide composite layers, and the resonance units of the top layer and the bottom layer are the same in structure. The resonance unit structure comprises a metal structure and a vanadium dioxide structure. According to the invention, the problem that the filtering function can only be realized at a specific resonant frequency once the structural parameters of the existing metamaterial are determined is solved.

The invention discloses an inorganic salt phase change material as well as a preparation method and application thereof. The inorganic salt phase change material composition is prepared from the following components in percentage by weight: 84.0 percent to 92.5 percent of inorganic hydrated salt, 5.5 percent to 8.0 percent of a temperature regulator, 1.0 percent to 5.0 percent of a nucleating agent and 1.0 percent to 3 percent of a thickening agent, the temperature regulator is selected from at least one of formamide, acetamide, urea and glycine, the weight ratio of the inorganic hydrated salt to the temperature regulator is S, and the range of S is 10.40-13.82. The temperature regulator is added, and the content of each component in the inorganic salt phase change material composition is selected to be in a proper range, so that in a system of the inorganic salt phase change material, amide compounds and inorganic hydrated salt of the temperature regulator have relatively strong interaction; and the temperature regulator and the inorganic hydrated salt form a compound in a new crystal form, so that the overall phase change temperature of the inorganic salt phase change material is reduced, and the inorganic salt phase change material has good phase change stability in a frequent phase change process.

The invention relates to spherical alpha-Al2O3 nanocrystals and a preparation method thereof. The preparation method comprises the following steps: S1, preparing materials; the preparation method comprises the following steps: preparing a PVP / SiO2 composite medium carrier solution: dispersing nano silicon dioxide in deionized water, and uniformly dispersing the nano silicon dioxide through ultrasonic treatment; adding polyvinylpyrrolidone (PVP) into the obtained dispersion liquid, and stirring until the PVP is completely dissolved to obtain a PVP / SiO2 composite medium carrier solution; preparing an aluminum ion solution: taking high-purity inorganic aluminum salt as a precursor, and dissolving the aluminum salt in the PVP / SiO2 composite medium carrier solution to obtain the aluminum ion solution; step S2, precipitation reaction; s3, heat treatment; and S4, washing and drying are carried out, and the spherical alpha-Al2O3 nanocrystal grains are obtained. The preparation method has the advantages that uniform adsorption and hydrolysis reaction of aluminum ions are effectively guided through introduction of the PVP / SiO2 composite medium carrier, formation of spherical aluminum hydroxide precipitates is promoted, then the spherical aluminum hydroxide precipitates are converted into spherical alpha-Al2O3 nanocrystals with uniform morphology after high-temperature heat treatment, and the morphology, the particle size and the purity of the alpha-Al2O3 nanocrystals are effectively and remarkably improved.

The invention provides a waste heat recycling method and system for an organic liquid hydrogen storage process, and the method comprises the steps: carrying out heat exchange treatment on a high-temperature gaseous hydrogenation product output from a reaction device and a liquid hydrogen storage carrier of which the pressure is lower than the pressure required by hydrogenation reaction, and heating and vaporizing the liquid hydrogen storage carrier to obtain a gaseous hydrogen storage carrier, pressurizing the gaseous hydrogen storage carrier to enable the gaseous hydrogen storage carrier to reach the pressure of hydrogenation reaction so as to obtain the gaseous hydrogen storage carrier meeting the temperature and pressure requirements of the hydrogenation reaction; and inputting the gaseous hydrogen storage carrier and hydrogen meeting the hydrogenation reaction temperature and pressure requirements into a reaction device for hydrogenation reaction to obtain a high-temperature gaseous hydrogenation product. By means of the method, waste heat generated in the hydrogen storage process can be efficiently recycled through the designed new system, and the energy-saving effect of the organic liquid hydrogen storage technological process is further enhanced.

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.