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33results about How to "Change phase transition temperature" patented technology

Preparation method of doping modified vanadium dioxide powder with lower phase transition temperature

The invention discloses a preparation method of vanadium dioxide ultrafine powder modified by doping W / Mo and having the phase transition temperature lower than that of the vanadium dioxide powder of the prior art. The preparation method of the vanadium dioxide powder comprises the following steps: doping by adopting a tungsten containing compound and a molybdenum containing compound as a tungsten source and a molybdenum source and by using a co-precipitation method to prepare a W-VO2 or Mo-VO2 precursor, roasting the obtained W-VO2 or Mo-VO2 precursor under the protection of an inert atmosphere at 450 to 700 DEG C, slowly and automatically cooling to the room temperature under the protection atmosphere, and then dispersing to obtain the W or Mo doped modified nano vanadium dioxide ultrafine powder. Since the method adopts no physical doping, the prepared W / Mo doped VO2 nano material is relatively low in cost and high in purity, and the obtained powder has much lower phase transition temperature compared with the VO2 nano material in the prior art.
Owner:SHANDONG HAIRONG ENERGY SAVING NEW MATERIAL CO LTD

Preparation method of submicron-level vanadium trioxide powder

The invention relates to a preparation method of submicron-level vanadium trioxide powder. The preparation method comprises 1, preparing an oxalic acid solution, 2, heating the oxalic acid solution, adding vanadium pentoxide powder into the oxalic acid solution, and carrying out a stirring reaction process until complete dissolution to obtain a vanadyl oxalate solution, 3, slowly adding ammonium hydroxide into the vanadyl oxalate solution and carrying out stirring for a reaction to obtain precipitates, 4, filtering the precipitates and carrying out drying to obtain a high-activity precursor and 5, roasting the high-activity precursor in an inert atmosphere to obtain submicron-level vanadium trioxide powder. The submicron-level vanadium trioxide powder has high product purity and a single phase, contains submicron-level spherical particles with the uniform sizes less than 1 microns and high particle surface activity and is conducive to further processing and use. The preparation method has simple processes, can be operated easily, has a low cost, is free of hydrogen or other reducing atmospheres, has high safety and a low three waste treating capacity and can be easily industrialized.
Owner:有研资源环境技术研究院(北京)有限公司

Rare earth magnetic-control shape memory alloy low in starting critical stress and preparation method thereof

ActiveCN105803266AHigh magnetocrystalline anisotropyReduce critical stressMagnetic materialsNoise controlRare earth
The invention provides a rare earth magnetic-control shape memory alloy low in starting critical stress and a preparation method thereof and belongs to the field of memory alloy materials. The material has the capacity to generate deformation under the control of a weak external magnetic field under the indoor temperature condition and is novel rare earth magnetic-control shape memory alloy according to which strain can be generated due to martensite twin boundary migration under the driving of the external magnetic field change with small strength at the indoor temperature. The chemical formula of the alloy is CoxNiyAlzCej, wherein 18<=x<=43, 27<=y<=34, 26<=z<=40, 1<=j<=15, x+y+z+j=100, and x, y, z and j represent the molar percentages. Compared with existing materials, the rare earth magnetic material has the low martensite twin crystal migration starting critical stress, wide magnetic-induced strain temperature range, high magnetic-induced strain capacity and good mechanical property and has important application value in the fields of micro displacement machines used at the indoor temperature, vibrating and noise control, linear motors, microwave devices, robots and the like.
Owner:来安县永阳知识产权运营有限公司

Rare earth magnetic material with controlled deformation of magnetic field and preparation method thereof

ActiveCN104018054AIncreased magnetic strainHigh magnetic strainMagnetic materialsNoise controlMicro actuator
The invention provides a rare earth magnetic material with controlled deformation of a magnetic field and a preparation method thereof. The material has the capability of generating micro-deformation controlled by an outer magnetic field at a room temperature and a temperature higher than the room temperature and is a novel rare earth magnetic control shape memory alloy capable of driving twin boundary migration of martensite by change of the external magnetic field to generate stress at a room temperature and a temperature higher than the room temperature. The chemical formula of the alloy is CoxNiyAlzDyj, wherein x is greater than or equal to 28 but less than or equal to 42, y is greater than or equal to 25 but less than or equal to 32, z is greater than or equal to 23 but less than or equal to 37, j is greater than or equal to 0.5 but less than or equal to 10, x+y+z+j=100, and x, y, z and j represent molar percentage contents. Compared with existing materials, the rare earth magnetic material has a wide magnetoelastic strain temperature range, great magnetoelastic strain and good mechanical property, and has important application in the fields such as micro-actuators, vibration and noise control, linear motors, microwave apparatuses and robots which can be used in temperatures higher than room temperature.
Owner:SOUTHEAST UNIV

A graphene oxide/silver particle composite reinforced paraffin type phase-change energy storage material and a preparing method thereof

A graphene oxide / silver particle composite reinforced paraffin type phase-change energy storage material and a preparing method thereof are disclosed. In the method, silver particles and graphene, adopted as filling materials, are added into a paraffin matrix to enhance inner heat conductivity of the matrix material; a coupling agent is adopted to modify graphene oxide to improve dispersibility ofthe graphene oxide in the matrix material; and a vacuum stirring drying method is adopted to uniformly disperse the graphene and nanometer silver particles into the matrix material, thus overcoming aggregation and settlement in common mixing. The composite thermal interface material prepared by the method can be widely applied in the energy industry, the electronic industry, the aerospace technique, and other related fields.
Owner:GUILIN UNIV OF ELECTRONIC TECH

Ti-Nb-O memory alloy having high recoverable strain and preparation method thereof

ActiveCN103526062AHigh recoverable strainHigh strengthIce waterShielding gas
The invention discloses a Ti-Nb-O memory alloy having a high recoverable strain and a preparation method thereof. The method comprises the steps: mixing uniformly a pure Ti powder, a pure Nb powder, a pure TiO2 powder and a pure TiH2 powder according to the ratio of Ti atoms, Nb atoms, O atoms and H atoms being (77-91):(8-18):(1-3):(0-5), and carrying out compression molding to obtain a green body; putting the green body into a sintering furnace, sintering under a protective gas atmosphere, and thus obtaining a sintered-state Ti-Nb-O alloy; putting the Ti-Nb-O alloy into a tube furnace, carrying out solid solution treatment under the argon gas protection, putting the solid solution state Ti-Nb-O memory alloy into the tube furnace, carrying out aging treatment under the argon gas protection, and then rapidly cooling in ice water to obtain the high recoverable strain. The Ti-Nb-O alloy shows low elastic modulus, extremely high compressive strength and relatively high recoverable strain, and is suitable for use in medical hard tissue replacement and reparation materials.
Owner:SOUTH CHINA UNIV OF TECH

Rare earth magnetic material with magnetic field controlled deformation and preparation method thereof

The invention provides a rare earth magnetic material with magnetic field controlled deformation and a preparation method thereof, and belongs to the field of shape memory materials.The material has the ability of producing micro deformation under the control of an external magnetic field at indoor temperature or higher temperature.The rare earth magnetic material is the novel rare earth magnetic control shape memory alloy capable of producing stress when martensite twin boundaries are driven by external magnetic field changes at indoor temperature or higher temperature.The chemical formula of the alloy is CoxNiyALzTbj, wherein x is larger than or equal to 27 and is smaller than or equal to 45, y is larger than or equal to 20 and is smaller than or equal to 31, z is larger than or equal to 20 and is smaller than or equal to 34, j is larger than or equal to 0.5 and is smaller than or equal to 8, the sum of x, y, z and j is 100, and x, y, z and j represent mole percentage content.Compared with existing materials, the rare earth magnetic material has the wide field-induced strain range, large field-induced strain and good mechanical property, and has the important application in the fields of micro displacement devices, vibration and noise control, linear motors, microwave devices, robots and the like capable of being used at the temperature higher than indoor temperature.
Owner:BAOTOU INST MAGNETIC NEW MATERIALS CO LTD

Cell-packaged thermo-sensitive hydrogel material with response temperature adjusted as well as preparation method and application thereof

InactiveCN109232995ASolve the problem of low retention rate and large lossIncrease gel speedPharmaceutical delivery mechanismProsthesisLiquid statePolyethylene glycol
The invention belongs to the fields of intelligent materials, high polymer materials and biomedical engineering and specifically relates to a cell-packaged thermo-sensitive hydrogel material with response temperature adjusted as well as a preparation method and application thereof. Cell-packaged thermo-sensitive hydrogel comprises the following raw ingredients by weight percentage: 12wt% of methylcellulose, 7.4wt% of PEG (polyethylene glycol)-20000, 1.4wt% of non-toxic inorganic sodium salt, 0-16wt% of xylitol and the balance of water. The non-toxic inorganic sodium salt is Na2HPO3.12H2O. According to the cell-packaged thermo-sensitive hydrogel material with response temperature adjusted, the thermo-sensitivity response temperature can be adjusted by adjusting the content of the xylitol,and the material has no biotoxicity. When the temperature is low, the material keeps a transparent liquid state; when the temperature is risen to phase inversion temperature, the material can be changed into a gel state. Additionally, the material has no biotoxicity, so that the material can be used for packaging and protecting a cell, and the packaged cell is then injected into a human body.
Owner:TONGJI UNIV

Preparation method of comb-shaped polymer phase change energy storage material

The invention discloses a preparation method of a comb-shaped polymer phase change energy storage material. The preparation method comprises the following steps: 1) adding polyethylene grafted maleic anhydride and alcohol with a hydroxyl active group on a terminal group, ether with a hydroxyl active group on a terminal group or mercaptan with a sulfydryl active group on a terminal group which are in a molar ratio of 1 to (0.5-5) into a reaction container, in the presence of nitrogen gas, adding an organic solvent subjected to water removal and a catalyst, and reacting for 6-12 hours at 60-120 DEG C to obtain reaction primary products; 2) cooling the reaction primary products, and washing and drying after removing the solvent to obtain the comb-shaped polymer phase change energy storage material. The preparation method disclosed by the invention is fewer in side reactions, high in yield, high in reaction speed, and convenient and simple in preparation. The prepared comb-shaped polymer phase change energy storage material has good crystallization property, thermal stability, setting performance and machinable property.
Owner:TIANJIN POLYTECHNIC UNIV

High damping superelasticity alloy and preparation thereof

The invention discloses high-damping super-elasticity alloy and a preparation method thereof, which belong to the technical field of an alloy material. The components and the contents of the alloy (according to mass percentage) are as follows: 10.0 to 14.0 percent of Al, 0.3 to 1.0 percent of Be, 0.01 to 0.30 percent of B and Cu as the rest. Microelement B is added into a Cu-Al-Be series shape memory alloy; the contents of Al and Be are correspondingly regulated; and a resistance furnace or an induction furnace is adopted for carrying out melting for directly preparing the high damping super elasticity alloy. The high damping super elasticity alloy can be used as high damping materials, the shape memory and super elasticity materials, functional compound materials and the like for development and utilization.
Owner:JIANGSU UNIV OF SCI & TECH

Magnetic nanohydrogel and preparation method thereof

The invention relates to magnetic nanohydrogel and a preparation method thereof. The magnetic nanohydrogel is prepared by coating Fe3O4 particles with poly(N,N-diethylacrylamide-co-acrylic acid) P(DEA-co-AA). The preparation method comprises the following steps: (1) dissolving a monomer A, a monomer B, a cross-linking agent and an emulsifier in de-ionized water, stirring at 20-25 DEG C in a nitrogen atmosphere, heating to 65-80 DEG C, keeping the temperature, adding an initiator, continuously reacting for 0.5-8 hours, and dialyzing to obtain copolymerized nanohydrogel; (2) adjusting the pH (potential of hydrogen) value of the copolymerized nanohydrogel, adding FeSO4.7H2O, stirring for 8-24 hours, dialyzing, adding NaNO2 and NH3.H2O, and performing centrifugal dialysis treatment to obtain the magnetic nanohydrogel. Compared with a conventional Fe3O4 particle-coated compound, the magnetic nanohydrogel is relatively good in size controllability and monodispersity and relatively excellent in magnetic property; the preparation method is simple in process, green and environment-friendly.
Owner:DONGHUA UNIV

Memory alloy driven by magnetic field to deform and preparing method of memory alloy

The invention provides a memory alloy driven by a magnetic field to deform and a preparing method of the memory alloy, and belongs to the field of shape memory alloys. The alloy has the capability that deformation is generated through control of an outer magnetic field under the room temperature condition and is a magnetic control shape memory alloy capable of generating recoverable strain under the room temperature condition through martensite twin boundary migration and reverse migration driven by the outer magnetic field changes. The chemical formula of the alloy is CoxNiyAlzFej, wherein x is larger than or equal to 28 but smaller than or equal to 42, y is larger than or equal to 25 but smaller than or equal to 32, z is larger than or equal to 23 but smaller than or equal to 37, j is larger than or equal to 0.5 but smaller than or equal to 10, the sum of x, y, z and j is 100, and x, y, z and j represent mol percentage content. Compared with existing materials, an Fe-Co intermetallic compound exists in a microstructure of the magnetic control shape memory alloy, the alloy has a wide magnetic-induced strain temperature range, large magnetic-induced strain capacity and good mechanical performance, and the magnetic control shape memory alloy can be importantly applied to the fields such as high-precision drivers and executers used at the room temperature.
Owner:来安县永阳知识产权运营有限公司

NiTi shape memory alloy with functions of energy absorption and vibration reduction, and preparation method and application thereof

ActiveCN112080669AChange phase transition temperatureChanging the dislocation densityNiti alloyEnergy absorption
The invention discloses a nickel-titanium shape memory alloy capable of simultaneously realizing the functions of energy absorption and vibration reduction, and a preparation method and application thereof, and relates to the technical field of NiTi shape memory alloys. A cold-deformed nickel-rich NiTi alloy is used for preparing a hand-shaped structure with a negative poisson ratio characteristic, and the phase change behavior and mechanical property of the NiTi alloy are regulated and controlled through heat treatment to a cold-deformed nickel-rich NiTi alloy component. Thus, stress-inducedmartensitic transformation occurs to the NiTi alloy component in the impact deformation process, and large impact energy is absorbed. The deformed NiTi alloy component is kept in a martensite state, and energy dissipation is promoted due to interaction between martensite variants, so that the component has higher damping performance after completion of impact, and a good damping effect is achieved.
Owner:JILIN UNIV

Preparation method of amphipathic comb-shaped polymer phase change energy storage material

The invention discloses a preparation method of an amphipathic comb-shaped polymer phase change energy storage material. The preparation method comprises the following steps: (1) reacting poly(oxyethylene) alkyl ether or a hydroxyl-containing compound with acyl chloride and an acid-binding catalyst to obtain an acyl active group-containing compound; (2) adding a thioacetate of active metal into an ethanol solution of the acyl active group-containing compound to obtain a crude substitution product, washing the crude substitution product and drying to obtain a substitution product; (3) adding the substitution product into an ethanol solution of sodium ethylate to have a reaction to obtain a sulfhydrylated product; (4) adding the sulfhydrylated product into a polyepichlorohydrin solution to obtain a reaction product, cooling the reaction product, and washing and dialyzing to obtain the amphipathic comb-shaped polymer phase change energy storage material. The preparation method is simple in polymerization process; the prepared amphipathic comb-shaped polymer phase change energy storage material has phase change property and controllable amphipathicity, is relatively high in yield and purity, and does not contain micromolecular matters.
Owner:TIANJIN POLYTECHNIC UNIV

Ferromanganese-based magnetic refrigeration material with low heat stagnation and preparation method and application thereof

The invention belongs to the technical field of refrigeration, and discloses a ferromanganese-based magnetic refrigeration material with low heat stagnation and a preparation method and application thereof. The ferromanganese-based magnetic refrigeration material with low heat stagnation is prepared by sintering hard magnetic powder and mixed powder containing manganese and iron. The hard magneticpowder is composed of one or more of neodymium iron boron, samarium cobalt and samarium iron nitrogen hard magnets. The molar ratio of the mixed powder meets the chemical general formula MnxFey-xPaSib, and x is more than or equal to 0.9 and less than or equal to 1.3, y is greater than or equal to 1.9 and less than or equal to 2, a is more than or equal to 0.15 and less than or equal to 0.75, a and b meet the condition that a + b is equal to 1. Through adding hard magnetic powder into a mixed material containing manganese and iron, the block material with low heat stagnation and high density is prepared, the phase change temperature and heat stagnation of the magnetic refrigeration material are effectively changed by adding the hard magnetic powder, the block material with low heat stagnation, large magnetocaloric effect and high density is prepared, and the preparation method is beneficial to being applied to the technical field of room-temperature magnetic refrigeration.
Owner:INNER MONGOLIA UNIV OF SCI & TECH

High-precision adjustable automatic trigger device and automatic fire extinguisher provided with same

The invention discloses a high-precision adjustable automatic trigger device. The high-precision adjustable automatic trigger device comprises a hollow shell, a memory spring, a movable block and an adjusting compression spring, wherein the bottom and / or the top of the hollow shell are / is provided with floatable adjustable cover bodies or the middle of the bottom and / or the middle of the top of the hollow shell are / is provided with floating adjusting parts; the memory spring is arranged at the top of an inner cavity of the hollow shell and made from memory alloy; the top end of the memory spring is connected with the inner wall of the top of the hollow shell; the movable block is arranged in the middle of the inner cavity of the hollow shell and located on one side of the bottom end of thememory spring; the top of the movable block is connected with the bottom end of the memory spring; the bottom end or the side face of the movable block is used as a trigger movable face connected with a part going to be triggered to move; the adjusting compression spring is arranged on the lower portion of the inner cavity of the hollow shell; the bottom of the adjusting compression spring is connected with the bottom of the hollow shell; and the top end of the adjusting compression spring is connected with the movable block. The invention further discloses an automatic fire extinguisher provided with the high-precision adjustable automatic trigger device.
Owner:河南迈瑞合金材料有限公司

Cyclohexane oxane liquid crystal monomer compound and preparation method thereof

The invention provides a cyclohexane oxane liquid crystal monomer compound and a preparation method of the cyclohexane oxane liquid crystal monomer compound. The structural formula of the compound isshown in the following formula, wherein R is any one of fluorine, chlorine, H, cyano, C1-C5 linear chain alkyl and C1-C5 linear alkoxy. The cyclohexane oxane liquid crystal monomer compound provided by the invention contains sulfonyl laterally and can change the phase transition temperature of molecules, the prepared monomer mixture not only has the advantage of low viscosity, but also has the characteristics of wide phase transition temperature and long screw pitch, and can be taken as raw materials of liquid crystal materials, thereby being beneficial to lowering the rotational viscosity ofthe liquid crystal materials and improving various dielectric coefficients.
Owner:SHAANXI LIGHTE OPTOELECTRONICS MATERIAL CO LTD

Rare earth magnetic material with controllable deformation of magnetic field and preparation method thereof

ActiveCN104018054BIncreased magnetic strainHigh magnetic strainMagnetic materialsNoise controlMicro actuator
The invention provides a rare earth magnetic material with controlled deformation of a magnetic field and a preparation method thereof. The material has the capability of generating micro-deformation controlled by an outer magnetic field at a room temperature and a temperature higher than the room temperature and is a novel rare earth magnetic control shape memory alloy capable of driving twin boundary migration of martensite by change of the external magnetic field to generate stress at a room temperature and a temperature higher than the room temperature. The chemical formula of the alloy is CoxNiyAlzDyj, wherein x is greater than or equal to 28 but less than or equal to 42, y is greater than or equal to 25 but less than or equal to 32, z is greater than or equal to 23 but less than or equal to 37, j is greater than or equal to 0.5 but less than or equal to 10, x+y+z+j=100, and x, y, z and j represent molar percentage contents. Compared with existing materials, the rare earth magnetic material has a wide magnetoelastic strain temperature range, great magnetoelastic strain and good mechanical property, and has important application in the fields such as micro-actuators, vibration and noise control, linear motors, microwave apparatuses and robots which can be used in temperatures higher than room temperature.
Owner:SOUTHEAST UNIV

Consistent melting composite phase change material and preparation method thereof

The invention discloses a consistent melting composite phase change material and a preparation method, and belongs to the technical field of phase change energy storage materials. The consistent melting composite phase change material comprises a phase change material and a heat conduction material, wherein the phase change material comprises a main phase change material and an auxiliary phase change material; the main phase change material is magnesium nitrate hexahydrate, and the content of the main phase change material in the phase change material is 60-70 mol%; the auxiliary phase change material is lithium nitrate, and the content of the auxiliary phase change material in the phase-change material is 30-40mol%; the content of the heat conduction material is 0-5wt% of the sum of the main phase change material and the auxiliary phase change material, and the content is not 0. The phase-change temperature of the main-phase phase-change material is adjustable by using the auxiliary phase, the eutectic phase-change material can relieve the problems of large supercooling degree and serious phase separation of a single hydrated salt phase-change material, and the supercooling degree of the phase-change material is extremely small, so that a nucleating agent does not need to be added in the preparation process; and the phase change material has high compatibility with aluminum and stainless steel 304, and can be widely applied to the field of clean heating.
Owner:UNIV OF SCI & TECH BEIJING

Side group functionalized polyamino acid block polymer, its preparation method and responsive reversible adhesive injectable hydrogel

ActiveCN112979942BAchieve reversible transformationGood for grooming applicationsAerosol deliveryOintment deliveryPolymer scienceReversible adhesion
The invention provides a side group-functionalized polyamino acid block polymer, which includes an A block and a B block. Compared with the prior art, the present invention uses the A block as a hydrophilic segment, and the B block as a hydrophilic and hydrophobic adjustable segment, and both have different degrees of polymerization, so that block polymers with different molecular weights can be obtained. Thereby forming temperature- and pH-sensitive hydrogels with different phase transition temperatures; at the same time, the block represented by the formula (III-C) in the B block can be protonated and deprotonated to achieve hydrophilic-hydrophobic transition, and then realize sol-gel The reversible transformation of the glue; moreover, the type and quantity of side groups can be changed by controlling the composition of the B block, which is beneficial to the further modification and application of the material; moreover, the polyamino acid block polymer provided by the invention significantly strengthens the material PMMA, The adhesion function of stainless steel and cells expands the application range of temperature-sensitive hydrogels and is beneficial to the application of temperature-sensitive hydrogels in biomedicine.
Owner:CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI

Method for preparing vanadium dioxide film through inorganic sol-gel method

The invention discloses a method for preparing a vanadium dioxide film through an inorganic sol-gel method. The method comprises the following steps that (1) a precursor is prepared; (2) a substrate is cleaned; (3) film coating is conducted through a lifting method; and (4) annealing treatment is conducted, specifically, a quartz glass sheet coated with the film is put into a tubular furnace, thetubular furnace is internally vacuumized firstly, then temperature-rising annealing treatment is conducted, and thus the vanadium dioxide thermochromic film is obtained. The required cost of the method is low, precursor raw materials are easy to obtain, the preparation process is simple and easy to carry out, technical repeatability is good, and mass production is easy.
Owner:TIANJIN POLYTECHNIC UNIV

A kind of rare earth magnetic material with controllable deformation of magnetic field and preparation method thereof

ActiveCN105755345BHigh magnetic strainLarge magnetic strain temperature rangeInorganic material magnetismNoise controlWide field
The invention provides a rare earth magnetic material with magnetic field controlled deformation and a preparation method thereof, and belongs to the field of shape memory materials.The material has the ability of producing micro deformation under the control of an external magnetic field at indoor temperature or higher temperature.The rare earth magnetic material is the novel rare earth magnetic control shape memory alloy capable of producing stress when martensite twin boundaries are driven by external magnetic field changes at indoor temperature or higher temperature.The chemical formula of the alloy is CoxNiyALzTbj, wherein x is larger than or equal to 27 and is smaller than or equal to 45, y is larger than or equal to 20 and is smaller than or equal to 31, z is larger than or equal to 20 and is smaller than or equal to 34, j is larger than or equal to 0.5 and is smaller than or equal to 8, the sum of x, y, z and j is 100, and x, y, z and j represent mole percentage content.Compared with existing materials, the rare earth magnetic material has the wide field-induced strain range, large field-induced strain and good mechanical property, and has the important application in the fields of micro displacement devices, vibration and noise control, linear motors, microwave devices, robots and the like capable of being used at the temperature higher than indoor temperature.
Owner:BAOTOU INST MAGNETIC NEW MATERIALS CO LTD

Ti-Nb-O memory alloy having high recoverable strain and preparation method thereof

ActiveCN103526062BHigh recoverable strainHigh strengthCompression moldingTube furnace
The invention discloses a Ti-Nb-O memory alloy having a high recoverable strain and a preparation method thereof. The method comprises the steps: mixing uniformly a pure Ti powder, a pure Nb powder, a pure TiO2 powder and a pure TiH2 powder according to the ratio of Ti atoms, Nb atoms, O atoms and H atoms being (77-91):(8-18):(1-3):(0-5), and carrying out compression molding to obtain a green body; putting the green body into a sintering furnace, sintering under a protective gas atmosphere, and thus obtaining a sintered-state Ti-Nb-O alloy; putting the Ti-Nb-O alloy into a tube furnace, carrying out solid solution treatment under the argon gas protection, putting the solid solution state Ti-Nb-O memory alloy into the tube furnace, carrying out aging treatment under the argon gas protection, and then rapidly cooling in ice water to obtain the high recoverable strain. The Ti-Nb-O alloy shows low elastic modulus, extremely high compressive strength and relatively high recoverable strain, and is suitable for use in medical hard tissue replacement and reparation materials.
Owner:SOUTH CHINA UNIV OF TECH

Polyamino acid block polymer with functionalized side group, preparation method of polyamino acid block polymer and response type reversible adhesive injectable hydrogel

The invention provides a polyamino acid block polymer with a functionalized side group. The polyamino acid block polymer comprises a block A and a block B. Compared with the prior art, the block A is used as a hydrophilic chain segment, the block B is used as a hydrophilic and hydrophobic adjustable chain segment, and the two have different polymerization degrees, so that block polymers with different molecular weights can be obtained, and the temperature and pH sensitive hydrogel with different phase change temperatures is formed; meanwhile, a block shown in a formula (III-C) in the block B can be protonated and deprotonated to realize hydrophilic-hydrophobic conversion, so that reversible conversion of the sol-gel is realized; moreover, the variety and the number of side groups can be changed by controlling the composition of the block B, so that the material is further modified and applied; in addition, the polyamino acid block polymer provided by the invention obviously enhances the adhesion function of PMMA, stainless steel, cells and the like, expands the application range of the temperature-sensitive hydrogel, and is beneficial to the application of the temperature-sensitive hydrogel in biomedicine.
Owner:CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI

A low starting critical stress rare earth magnetically controlled shape memory alloy and its preparation method

ActiveCN105803266BLow starting critical stressImprove magnetic propertiesMagnetic materialsNoise controlRare earth
The invention provides a rare earth magnetic-control shape memory alloy low in starting critical stress and a preparation method thereof and belongs to the field of memory alloy materials. The material has the capacity to generate deformation under the control of a weak external magnetic field under the indoor temperature condition and is novel rare earth magnetic-control shape memory alloy according to which strain can be generated due to martensite twin boundary migration under the driving of the external magnetic field change with small strength at the indoor temperature. The chemical formula of the alloy is CoxNiyAlzCej, wherein 18<=x<=43, 27<=y<=34, 26<=z<=40, 1<=j<=15, x+y+z+j=100, and x, y, z and j represent the molar percentages. Compared with existing materials, the rare earth magnetic material has the low martensite twin crystal migration starting critical stress, wide magnetic-induced strain temperature range, high magnetic-induced strain capacity and good mechanical property and has important application value in the fields of micro displacement machines used at the indoor temperature, vibrating and noise control, linear motors, microwave devices, robots and the like.
Owner:来安县永阳知识产权运营有限公司

A kind of cyclohexane oxane liquid crystal monomer compound and preparation method thereof

The invention provides a cyclohexane oxane liquid crystal monomer compound and a preparation method of the cyclohexane oxane liquid crystal monomer compound. The structural formula of the compound isshown in the following formula, wherein R is any one of fluorine, chlorine, H, cyano, C1-C5 linear chain alkyl and C1-C5 linear alkoxy. The cyclohexane oxane liquid crystal monomer compound provided by the invention contains sulfonyl laterally and can change the phase transition temperature of molecules, the prepared monomer mixture not only has the advantage of low viscosity, but also has the characteristics of wide phase transition temperature and long screw pitch, and can be taken as raw materials of liquid crystal materials, thereby being beneficial to lowering the rotational viscosity ofthe liquid crystal materials and improving various dielectric coefficients.
Owner:SHAANXI LIGHTE OPTOELECTRONICS MATERIAL CO LTD

Magnetic memory alloy with long function life and preparation method thereof

The invention provides a magnetic memory alloy with long function life and a preparation method thereof and belongs to the field of shape memory alloys. Compared with other magnetic shape memory alloys, the magnetic memory alloy has the two advantages of the two aspects of good mechanical properties and long function life. The chemical formula of the magnetic memory alloy is CoxNiyAlzNdj, wherein31.9 <= x <= 39.8, 30.1 <= y<= 34.6, 29.2 <= z <= 35.7, 0.8 <= j <= 1.5, x+y+z+j = 100, and x, y, z and j represent mole percentages. Compared with existing materials, the magnetic shape memory alloyhas the advantages that the coherent superfine Co7Nd2 intermetallic compound is formed around the second phase of the memory alloy, magnetic performance and function fatigue resistance of the magneticmemory alloy are improved greatly while mechanical properties of the second phase are enhanced, thus the magnetic memory alloy has both good mechanical properties and the long function life, and theindustrial application range of the magnetic memory alloy is widened greatly.
Owner:NANJING INST OF TECH

Low-fatigue magnetic memory alloy and preparation method thereof

InactiveCN110819870AImprove fatigue lifeLarge magnetic strainShape-memory alloyMagnetic memory
The invention provides a low-fatigue magnetic memory alloy and a preparation method thereof, and belongs to the field of shape memory alloys. Compared with other magnetic shape memory alloys, the alloy has the advantages of large magnetic-field-induced strain and long fatigue life. The chemical formula of the alloy is: NixAlyCozEuj, wherein x is greater than or equal to 34.8 and is less than or equal to 38.9; y is greater than or equal to 27.4 and is less than or equal to 32.5; z is greater than or equal to 30.8 and is less than or equal 35.6; j is greater than or equal to 0.5 and less than orequal to 1.0; x+y+z+j=100; and x, y, z and j represent molar percentage content. Compared with the existing materials, the low-fatigue magnetic memory alloy has the advantages that coherent ultrafinedispersively distributed Ni17Eu2 intermetallic compounds are formed in a matrix phase of the memory alloy, the magnetic-field-induced strain ability of the alloy is strengthened, the fatigue life ofthe alloy is also prolonged, the alloy has large magnetic-field-induced strain and long fatigue life, and the industrial application range of the alloy is greatly expanded.
Owner:NANJING INST OF TECH

A kind of preparation method of submicron vanadium trioxide powder

The invention relates to a preparation method of submicron-level vanadium trioxide powder. The preparation method comprises 1, preparing an oxalic acid solution, 2, heating the oxalic acid solution, adding vanadium pentoxide powder into the oxalic acid solution, and carrying out a stirring reaction process until complete dissolution to obtain a vanadyl oxalate solution, 3, slowly adding ammonium hydroxide into the vanadyl oxalate solution and carrying out stirring for a reaction to obtain precipitates, 4, filtering the precipitates and carrying out drying to obtain a high-activity precursor and 5, roasting the high-activity precursor in an inert atmosphere to obtain submicron-level vanadium trioxide powder. The submicron-level vanadium trioxide powder has high product purity and a single phase, contains submicron-level spherical particles with the uniform sizes less than 1 microns and high particle surface activity and is conducive to further processing and use. The preparation method has simple processes, can be operated easily, has a low cost, is free of hydrogen or other reducing atmospheres, has high safety and a low three waste treating capacity and can be easily industrialized.
Owner:有研资源环境技术研究院(北京)有限公司
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