975 results about "Phase transition temperature" patented technology

PCT No. PCT/SE95/01560 Sec. 371 Date Mar. 20, 1996 Sec. 102(e) Date Mar. 20, 1996 PCT Filed Dec. 20, 1995 PCT Pub. No. WO96/19199 PCT Pub. Date Jun. 27, 1996A proliposome powder, said powder comprising in a single phase discrete particles of a biologically active component together with a lipid or mixture of lipids having a phase transition temperature of below 37 DEG C. and a process for the manufacture of a proliposome powder for inhalation.

A system and method for performing spinal fusion using vertebral connecting rods constructed of a shape memory material, such as shape memory alloy. The connecting rod is cooled below its phase transition temperature, which is chosen to be just below body temperature, and is inserted through a curved guide tube previously inserted into the back of the patient. The guide tube is located so as to deliver the connecting rod at its desired location between the preinserted pedicle screw heads. The rod, being in its flexible state below the transition temperature, negotiates the curve and exits the guide tube in a straight form and parallel to the patient's spine. As it heats up to body temperature, it regains its original straight shape and its original rigidity, and is ready for connecting its associated vertebrae to each other.

This invention provides methods and compositions to preserve bioactive materials in a dried foam matrix. Methods provide non-boiling foam generation and penetration of preservative agents at temperatures near the phase transition temperature of the membranes.

The invention relates to a kind of nano cellulose solid - solid phrase change material and its producing method. Its characteristics are: in non-homogeneous phase system, according to the reactants proportions as polyethylene glycol containing active group at one end or both ends 19.8% - 82.0%, crosslinking agent 0% - 55.1% and nanometer cellulose or its ramification 4.0% - 69.5%, ingraft the polyethylene glycol containing active group at one end or both ends as energy storing function group onto nanometer cellulose or its ramification framework material. The biggest enthalpy of phase change of the nanometer cellulose solid - solid phrase change material of the invention can get to over 110 J/g, the phrase change temperature is 0 - 60 Deg. C, and can keep good solid state before and after the phrase change. It won't occur phrase separation, besides it is non-toxic and harmless, low cost, simple producing technics.

The invention relates to a phase transition temperature adjusting cup, which comprises a cup body outer casing, a cup body inner casing and a top cover, and the composite phase transition material is filled between the inner casing and the outer casing. The composite phase transition material comprises phase transition material, a nucleating agent, heat conduction filling material and a thickening agent. The phase transition material is selected from one or more of sodium acetate trihydrate, sodium thiosulfate pentahydrate, twelve disodium hydrogen phosphate, sodium sulfate decahydrate and decahydrate. <{EN4}>The nucleating agent is selected from one or more of borax, sodium phosphate dibasic anhydrous, diatomaceous earth, silica, sodium silicate, eight water strontium hydroxide, hexahydrate chloride strontium. <{EN5}>The heat conduction filling material is selected from one or more of graphite, carbon nanotube, expanded graphite, carbon fiber, graphene, three-dimensional graphite foam, silicon carbide, copper powder. <{EN6}>The thickening agent is selected from one of polyacrylic acid emulsion or carboxymethylcellulose sodium. <{EN7}>Compared with existing temperature adjusting cups, the phase transition temperature adjusting cup of the present invention has the advantages of rapid cooling, simple structure convenient operation, 3-4 hours of comfort temperature zone, and not being restricted from external environment.

The invention relates to a method for preparing an organic and inorganic composite phase-transition material. The method comprises the following steps: firstly, inorganic porous minerals are added into a reaction kettle; and secondly, the reaction kettle is vacuumized and injected with an organic material and then pumped into the state of negative pressure, and the temperature and the stirring speed are required to be adequately controlled during the reaction process. The method takes the inorganic porous mineral materials as a carrier for vacsorb of organic phase-transition materials which accord with the phase-transition requirements; the composite phase-transition material product prepared has the characteristics of no leakage, inflaming retarding, high phase-transition potential, easily controllable phase-transition temperature and so on; and the preparation method has a simple technology and low cost, has no secondary pollution, and is suitable for flow production and industrial production.

The invention relates to an intelligent phase-change material with adjustable phase-change temperature and its preparing process, which comprises making doped vanadium dioxide precursor through liquid phase precipitation method, carrying out filtering, scouring, drying, heating and crystallizing. The crystal grain dimension of the obtained phase-change material is less than 100 nanometers, thus can be applied into intelligent window coating material and temperature measurement resistors.

This invention relates to preparation method of a facies change stuff microcapsule. It takes paraffin as phase-change material, takes toluene diisocyanate and urea-formaldehyde resin as cyst wall stuff, by interfacial polymerization and in situ polymeric method to carry out microencapsulate, to prepare double deck, microcapsule packed paraffin phase-change material. This method could prepare microcapsule phase-change material that contain any specification paraffin from 1% to 70%. Transformation temperature of this phase-change material is adjustable from 0 to 70 deg.C. This compound phase-change material can directly apply to construction region, textile region, and martial region and so on.

The invention discloses a method for preparing hypovanadic oxide powder-doped material, which belongs to the production and preparation field of inorganic functional materials and relates to the preparation of hypovanaic oxide powder doped with W, Mo or W/Mo. The method comprises the following steps: mixing and evenly grinding a vanadium source, a doped raw material and an auxiliary agent, pouring the mixture after being molten at a high temperature and keeping the temperature for a certain period of time into cold water to be rapidly water-quenched, drying the formed gel to form dry gel, thermal-reducing the grinded dry gel in the reduction atmosphere, performing annealing treatment in a protective atmosphere, and realizing the crystalling phase conversion at a constant temperature so as to obtain M-phase VO2 with phase transition property. The phase transition temperature of the VO2 powder after doping can be effectively controlled by adjusting the W and Mo atom doping amount. The invention has remarkable advantage in the aspects of preparation cost, product performance, technique flow, friendly environment, economic profit, and the like, has easily available raw materials, simple and convenient synthesis, low requirement on the equipment and high product performance, is suitable for industrial production and has wide application of product.

This invention provides methods, systems and compositions to preserve bioactive materials in a dried foam matrix. Methods provide non-boiling foam generation and penetration of preservative agents at temperatures near the phase transition temperature of the membranes. Bioactive materials can be preserved with high initial viability in a freeze-foam process employing low temperature secondary drying.

The invention relates to high heat conducting compound phase change energy storage material and the preparing method. The material is compounded by inorganic metal multi-hole consecutive material, phase change energy storage material which is solid-liquid phase change one, and hole sealing material. The preparing method includes the following steps: using inorganic metal multi-hole consecutive material as carrier, solid-liquid phase change energy storage material as functional material; dipping the cleaned carrier into liquid state functional material to make it absorb fully; cooling curing and sealing hole. The material has the features of high heat conducting ratio, easy forming, stable phase change temperature, high chemical stability. The preparing method is economic, convenient, practical, and easy generalization application. The invention can be used in high performance cooling plate making, solar energy storage, waste heat utilizing etc.

The invention discloses a low-impact non-pyrotechnic separation device, which is used for the locking and release between stages of a rocket, between a satellite and a launch vehicle, and of a satellite solar panel substrate, an antenna and the like. The low-impact non-pyrotechnic separation device is formed by using a shape memory alloy as a triggering switch and being provided with components and parts of springs, a locking sleeve, a split nut and the like in a matching manner. Based on the shape memory effect of the shape memory alloy, stretching and pre-deformation are firstly carried out on the shape memory alloy during assembly; when separation and unlocking are needed, an alloy material is electrified and heated to be at a phase-transition temperature of the alloy material; the alloy material is recovered to be in a shape before the pre-deformation; thus, a triggering block is driven to act; the locking sleeve is disengaged from the split nut; the release of loads of the satellite and the like is realized. After the one-time separation is completed, a trigger part inside a shell can be conventionally taken out; a shape memory alloy wire is loaded in the low-impact non-pyrotechnic separation device after the pre-deformation is carried out on the shape memory alloy wire once again by adopting a special tool; thus, the low-impact non-pyrotechnic separation device can be repeatedly used. The separation device provided by the invention is low in impact, can be repeatedly used, has no pollution, is low in cost, is safe to use, and is especially applicable to an occasion which is high in the requirement on a separation impact.

An electrically-heated shape-fixed phase-change heat-accumulating material for heating indoor air is prepared from paraffin wax, polyolefin, thermoplastic elastomer and inorganic filler and has the 30-40 deg.C of phase change temp. The solar one is prepared from the paraffin wax whose number of carbon atoms is 16-20, polyolefin, thermoplastic elastomer and inorganic filler and has the 17-25 deg.Cof phase change temp. Their preparing process is also disclosed.

A process for preparing a form-fixed phase change material includes plasticizing olefine polymer (10-50 wt.%) to become chips, gradually adding paraffine until its content is 90-50 wt%, breaking, smelting-extruding out, water cooling and baking. The said polymer may be at least one of polyethene, polypropene, polybutene, etc. The resultant material features 25-70 deg.c for phase-changing temp, high phase-changing enthalpy up to 175 KJ/kg and no molecular leakage.

The invention discloses a phase-change energy-storage building insulation structure. A wall structure is successively provided with a wall substrate, an insulation layer, a directional structural plate, a fixed-form phase-change energy-storage insulation board and an exterior board in the direction from outdoor to indoor, and the fixed-form phase-change energy-storage insulation board comprises an inorganic composite phase change material and a packaging plate; the inorganic composite phase change material is composited from inorganic hydrated salt and a porous structure carrier, and the phase transition temperature of the phase change material is 10-40 DEG C; in inorganic composite phase change material, the weight percentage content of the inorganic hydrated salt is 40-95%, and the inorganic composite phase change material is coated with light-cured resin with fire resistance and corrosion resistance. The phase-change energy-storage building insulation structure has the good effects of heat preservation and thermal insulation, and can store cold quantity in outdoor air at summer night in the phase-change energy-storage insulation board; in the daytime, the stored cold quantity is released into indoor air so as to prolong the time of an indoor peak temperature, reduce the fluctuation of the indoor temperature, improve the environmental comfort and reduce the energy consumption of an air conditioner in summer.

The present invention relates to a kind of high molecular solid/solid phase changing material with mixed net and comb structure, and features that polyglycol with two active end radical and polyglycol with one active end radical are fixed onto the high molecular skeleton material to form 3D mixed net and comb structure. The material of the present invention has relatively great phase change enthalpy up to 120 J/g, proper phase change temperature capable of being altered in 0-65 deg.c, stable solid state before and after phase change without supercooling, separating and other unstable phenomenon, high mechanical strength, high solvent resistance, good machining performance, no toxicity, no leakage, no corrosion, no pollution, long service life and other advantages. The present invention may be used widely in solar energy utilization, afterheat recovering, intelligent air conditioner and other fields.

The present invention discloses an organic matter/expanded graphite composite phase-changing heat-storing building material and the preparation thereof, the method comprises the following procedures: (1) the swelling of the acidic graphite under the function of the microwave to form the expanded graphite with abundant micropore structure; (2) executing blending adsorption to the organic phase-changing material and the expanded graphite at the condition higher than the phase transition temperature, and the organic phase-changing material is adsorbed to the micropore structure of the expanded graphite; (3) the preparing of the organic/expanded graphite composite phase-changing heat storing building material comprising the following steps: (a) the preparing of the heat storing fiber gypsum board, (b) the preparing of the heat storing cement. The method of the invention settles the compatibility of the problem of organic phase-changing material and the building material and the stability. The organic/expanded graphite composite phase-changing heat storing building material has the advantages of low cost, large heat storing density, good heat conducting property and no inflammability.

The invention discloses a method for preparing graphene oxide modified composite phase-change microcapsules. The method specifically comprises the following steps: preparing a graphene oxide solid from graphite powder, concentrated sulfuric acid, sodium nitrate, potassium permanganate and deionized water; mixing the obtained graphene oxide solid with absolute ethyl alcohol and a silane coupling agent, and performing a reaction so as to obtain a double-bond modified functional graphene oxide solid; uniformly mixing the obtained functional graphene oxide solid with a phase-change material, a reaction monomer, a cross-linking agent, a reactive emulsifier and deionized water, and performing ultrasonic dispersion so as to form an oil-in-water type pre-emulsion; and putting the obtained oil-in-water type pre-emulsion into a hot water bath, continuously stirring, further adding an initiator solution, and performing a heat-preservation reaction, thereby obtaining the graphene oxide modified composite phase-change microcapsules. By adopting the method disclosed by the invention, composite phase-change microcapsules which are high in encapsulation efficiency, stable in property, good in heat conductivity, appropriate in phase-change temperature and relatively high in phase-change latent heat enthalpy can be prepared.

The present invention provides a method of producing a liquid crystal display device which enables suppression of the occurrence of an electric double layer on a horizontal photo-alignment film before a polymer is formed, and exhibits reduced deterioration of display quality such as image sticking, or reduced display unevenness. The present invention is a method of producing a liquid crystal display device including the steps of (1) forming a liquid crystal layer containing a polymerizable monomer between a first substrate and a second substrate; (2) thermally annealing the liquid crystal layer at a temperature higher by 10° C. or more than the liquid crystalline phase-isotropic phase transition temperature of the liquid crystal layer; (3) forming horizontal alignment films to which the alignment treatment is performed by light irradiation on the first substrate and the second substrate by the time of the step (2); and (4) polymerizing the polymerizable monomer after the step (2).

The invention discloses a method for preparing a vanadium dioxide film. According to the method, metal vanadium or low-valence vanadium oxide film is annealed in oxygen and vacuum to obtain a phase-transition vanadium dioxide film; the most proper oxygen partial pressure, the annealing temperature and the annealing time are selected according to the type and thickness of the low-valence vanadium oxide to obtain a vanadium dioxide film with excellent performance, wherein the infrared regulation rate at 2,400nm can be 58 percent, and the visible light transmittance can be 43 percent; the doped low-valence vanadium oxide film is oxidized to obtain the doped vanadium dioxide film, and the phase transition temperature of the vanadium dioxide can be regulated by means of doping to adapt to different requirements. The vanadium dioxide film can be applied to optical information storage, photoelectric switches, intelligent windows and uncooled infrared focal plane imaging; the method is compatible with large-scale coated glass production process, and a vanadium dioxide film with excellent performance can grow on amorphous glass.

The invention provides a method for improving planar orientation of cholesteric liquid crystal based on smectic-cholesteric phase transition, which relates to the technical field of optical thin film materials and particularly relates to a planar orientation method of cholesteric liquid crystal display materials, such as an optical brightness enhancement film and an IR shielding film. The method comprises the following steps: mixing smectic liquid crystals, nematic liquid crystals, cholesteric liquid crystals, chiral additive and the like according to a certain ratio to prepare a complex liquid crystal system with smectic-cholesteric phase transition; stirring uniformly, and injecting the complex liquid crystal system into a liquid crystal box or between two plastic films; and heating the sample film at the smectic-cholesteric phase transition temperature mainly in two heat treatment manners, including slowly heating the sample film from smectic phase to cholesteric phase or keeping temperature close to the smectic-cholesteric phase transition temperature for a long time. The method has the advantage that both of the two heat treatment manners can improve planar orientation of cholesteric liquid crystals with different pitches, thereby improving transmittance of the liquid crystal film and effectively improving optical properties of cholesteric liquid crystal devices.

This disclosure outlines a new method of modifying the properties of existing liquid crystals by doping them with ferroelectric micro- and nanoparticles. We show that this approach, in contrast to the traditional time consuming and expensive chemical synthetic methods, enriches and enhances the electro-optical performance of many liquid crystal materials. We demonstrate that by changing the concentration and type of ferroelectric particles the physical properties of the nematic, smectic, and cholesteric liquid crystal materials can be changed, including the dielectric constants, the birefringence, the phase transition temperatures, and even the order parameter. We also demonstrate the performance of these new materials in various devices, including displays, light modulators, and beam steering devices.