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981 results about "Phase transition temperature" patented technology
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The phase transition temperature is defined as the temperature required to induce a change in the lipid physical state from the ordered gel phase, where the hydrocarbon chains are fully extended and closely packed, to the disordered liquid crystalline phase, where the hydrocarbon chains are randomly oriented and fluid.
Powders for inhalation
InactiveUS6045828AControl cohesivenessGood estimateBiocideOrganic active ingredientsLipid formationInhalation
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.
Owner:ASTRAZENECA AB
Liquid crystal display device, image shifting device, and image display apparatus
ActiveUS6885412B2Quality improvementQuick responseLiquid crystal compositionsTelevision system detailsLiquid-crystal displayEngineering
A liquid crystal display device includes a first substrate, a second substrate opposing the first substrate, a liquid crystal layer provided in a gap between the first substrate and the second substrate, and a temperature adjustment member formed on the first substrate and / or the second substrate. The panel temperature T (° C.) of the liquid crystal display device is controlled to be equal to or greater than TNI-65 and less than or equal to TNI-15, where TNI (° C.) is the nematic-isotropic phase transition temperature of the liquid crystal composition of the liquid crystal layer.
Owner:SHARP KK
Phase-transition composite material, preparation method and application thereof
ActiveCN102408877APhase transition temperature is suitableLarge latent heat of phase changeClimate change adaptationHeat proofingParaffin waxThermal insulation
The invention relates to a phase-transition composite material which comprises: A) 30-65% of phase-transition materials which are low melting point paraffin with a melting point of 25-45 DEG C and / or dodecanol; B) 25-45% of carrier materials which are high density polyethylane and / or ethane-vinylacetate copolymer; C) 5-15% of inorganic fillers which are porous substances and are selected from one or two of expanded perlite and expandable graphite; D) 1-10% of heat-conduction reinforcing agents; and E) 1-10% of fire retardants. The composite material has an appropriate phase transition temperature which matches the building ambient temperature, has great phase transition latent heat, excellent heat-preservation and heat-insulation performance, is fireproof and flame-retardant, is easy to process, and has greatly reduced phase-transition material leakage. The invention also relates to a method for preparing the phase-transition composite material, which comprises the thermal insulation mortar of the phase-transition composite material and a method of heat preservation of a wall by using the mortar.
Owner:BEIJING UNIV OF CHEM TECH +1
Minimally invasive spinal fusion
ActiveUS20070162007A1High material strengthEasy to transformInternal osteosythesisJoint implantsShape-memory alloyCatheter
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.
Owner:MAZOR ROBOTICS
Preservation of bioactive materials by freeze dried foam
ActiveUS7135180B2Improve permeabilityReduce residual moistureSsRNA viruses negative-senseOrganic active ingredientsPreservativeFreeze-drying
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.
Owner:MEDIMMUNE LLC
Nano cellulose solid-solid phase transition material and its preparing method
InactiveCN1710012ASimple manufacturing processNo phase separationHeat-exchange elementsPolyethylene glycolFunction group
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.
Owner:GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
Thermally conductive phase change materials
A phase change composition comprises: a matrix comprising an organofunctional silicone wax, and a thermally conductive filler. The composition can be used as a thermal interface material in electronic devices. The composition is formulated to have any desired phase change temperature.
Owner:DOW CORNING CORP
Energy-saving temperature-control phase-change material
InactiveCN102827588ARaw materials are easy to getLarge latent heatScarvesHead-scarvesMaterials scienceWater of crystallization
The invention relates to an energy-saving temperature-control phase-change material. The energy-saving temperature-control phase-change material is characterized by comprising compositions in percentage by weight: 50-90% of phase-change host, 1-40% melting point control agent, 0.1-10% nucleating agent, 5-15% of crystal modifier and the balance of water. Crystallized hydrated salt phase-change material has the advantages that raw materials are easily available, the price is low, the energy density is large and the like, and the defects of being supercooling, carrying out phase separating, blocking and the like also seriously hinders the popularization and application. The phase-change host is of crystallized hydrated salt, has fixed melting point, the phase-change temperature is regulated through adding the melting point control agent so as to be capable of completing meeting the requirement of normal application. The phase-change crystal particles are fine through adding the crystal modifier, phase separation can also be prevented, attenuation is slowed down, the stability of the phase-change materials is improved, and the service life of the product is prolonged.
Owner:杨宁
Preparation method for carbon-containing material metal organic framework-based composite phase change material
InactiveCN104745149AImprove heat transfer performanceImprove cycle stabilityHeat-exchange elementsModified carbonMetal-organic framework
The invention discloses a preparation method for a carbon-containing material metal organic framework-based composite phase change material and belongs to the field of nano composite materials and composite phase change materials. The preparation method comprises the following steps: carrying out in-situ growth of MOFs particles on a polyvinylpyrrolidone (PVP)-modified carbon material surface by adopting a hydrothermal method to prepare a carbon-containing material metal organic framework-based porous carrier material; then, dispersing a carbon material @MOFs porous carrier material into a prepared solution containing a phase change core material by adopting a solution dipping method; adsorbing a phase change core material by utilizing an oversized specific surface area of the metal organic framework material and a nao duct structure; and drying at a temperature higher than the phase change material to obtain the carbon-containing material metal organic framework-based composite phase change material. The material can be used for improving the heat transfer performances of the composite phase-change material, effectively preventing core material leakage, and has the advantages of wide core material selection range. The composite phase change material prepared by the method provided by the invention is excellent in heat transfer performance, good in circulating stability, simple in process and suitable for large-scale production.
Owner:UNIV OF SCI & TECH BEIJING
Phase transition temperature adjusting system and phase transition temperature adjusting cup
ActiveCN104887011AHeat absorption and release performance are highly matchedGuaranteed to drink normallyDrinking vesselsCarbon nanotubeSodium Thiosulfate Pentahydrate
Owner:YUTIAN ENERGY CO LTD
Preparation of organic inorganic composite phase-change material
InactiveCN101348708ASolve the problem of extravasationSolve the key technology of combinationHeat-exchange elementsMaterials scienceOrganic inorganic
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.
Owner:贵州中益能新材料科技有限公司
Phase-transition intelligent materials with adjustable phase-transition temperature and process for preparing same
InactiveCN1837061AReduce infrared transmittanceIt has the function of intelligent temperature controlOther chemical processesVanadium oxidesVanadium dioxideMaterials science
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.
Owner:FUDAN UNIV
Preparation method of phase transformation material microcupsule
InactiveCN101045857AHigh mechanical strengthRaw materials are easy to getHeat-exchange elementsMicroballoon preparationParaffin waxToluene diisocyanate
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.
Owner:HUILIN SHENGDA ENERGY MATERIAL SCI & TECH DEV BEIJING
Method for preparing hypovanadic oxide doped powder material
InactiveCN101481142ALower phase transition temperatureEffective dopingVanadium oxidesPhase conversionAtmosphere
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.
Owner:DALIAN UNIV OF TECH
Preservation of bioactive materials by freeze dried foam
InactiveUS20100297231A1Easy to getPractical and efficientAntibacterial agentsPowder deliveryFreeze-dryingPreservative
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.
Owner:MEDIMMUNE LLC
High-heat-conducting composite phase-transition energy-storage material and its preparing method
InactiveCN1935932AImprove thermal conductivityImprove stabilityHeat-exchange elementsChemical stabilityThermal transmittance
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.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Low-impact non-pyrotechnic separation device
InactiveCN106494651AKeep the position fixedGuaranteed fixed effectCosmonautic vehiclesCosmonautic component separationMemory effectPre deformation
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.
Owner:SHANGHAI AEROSPACE CONTROL TECH INST
Material for storing heat and supplying heat for building generated shaped phase change by heating and its preparation method
InactiveCN1462787ANo leakageApplicable to building heatingHeat-exchange elementsParaffin waxPolyolefin
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.
Owner:TSINGHUA UNIV
Process for preparing shaped phase change material
InactiveCN1369537ANo leaksThe phase transition process is reversibleHeat-exchange elementsParaffin waxPhase change enthalpy
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.
Owner:TSINGHUA UNIV
Three-dimensional gel network carrier and form-stable phase change composite material
InactiveCN101709104AReduce lossesNo lossHeat-exchange elementsPhase change enthalpyPolyethylene glycol
The invention relates to a three-dimensional gel network carrier and a form-stable phase change composite material which adopt fatty acid (hydrocarbon), polyethylene glycol and other organic phase change materials as work material and use poly-(N-hydroxymethyl)-acrylamide heat-shrinkable interpenetration network as form-stable carrier. The preparation method of the phase change composite material comprises the following steps: firstly adopting low temperature eutectic method to select multiple components composite phase change material with proper phase change temperature, high phase change enthalpy and low cost, designing and determining the preparation method of the interpenetration network carrier and the addition mode of the composite phase change material and the combination mode of the carrier, preparing the form-stable phase change composite material based on multiple actions of bonding, physical adsorption and network confinement, cooling and grinding to obtain the form-stable heat storage functional particles. The form-stable phase change composite material containing 50%-75% of material can be prepared by the method, the maximum phase change enthalpy can be up to 110J / g, and the form-stable phase change composite material prepared by the method can be directly applied in the textile field, building field, military field, etc.
Owner:DALIAN POLYTECHNIC UNIVERSITY
Phase-change energy-storage building insulation structure
InactiveCN107227807AResolve separabilitySolve the shortcomings of large supercoolingConstruction materialWallsInsulation layerPhase change
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.
Owner:SOUTH CHINA UNIV OF TECH
High molecular solid/solid phase changing material with net type and comb type mixed structure and its preparing method
InactiveCN1616588APhase transition temperature is suitableSolid state goodHeat-exchange elementsPhase change enthalpyPolyethylene glycol
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.
Owner:GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
Novel ferroelectric single-crystal lead ytterbium niobate-lead magnesium niobate-lead titanate
InactiveCN102051685APolycrystalline material growthFrom melt solutionsCrystal rotationSingle crystal
The invention relates to the growth, the structures and the properties of novel ferroelectric single-crystal lead ytterbium niobate-lead magnesium niobate-lead titanate. The crystal belongs to a perovskite structure, has an MPB region and has a chemical formula of (1-x-y)Pb(Yb1 / 2Nb1 / 2)O3-xPb(Mg1 / 3Nb2 / 3)O3-yPbTiO3 which is short for PYMNT or PYN-PMN-PT. By adopting a top crystal-seeded method, the crystal with large size and high quality can grow under the conditions that the growth temperature of the crystal is 950-1100 DEG C, the crystal rotation speed is 5-30rpm, and the cooling speed is 0.2-5 DEG C / day, and the grown crystal exposes a 001 natural growth surface. Through X-ray powder diffraction, the system is confirmed as the perovskite structure; and through ferroelectric, dielectric and piezoelectric measurement, the ferroelectricity, the dielectric property and the piezoelectricity of the crystal are analyzed. The crystal has high Curie temperature and trigonal-tetragonal phase transition temperature, large piezoelectric constant and electromechanical coupling factor, high dielectric constant and low dielectric loss and better heat stability. The crystal can be widely applied to devices in the piezoelectric fields of ultrasonically medical imaging, sonar probes, actuators, ultrasonic motors, and the like.
Owner:FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
Organic matter/expandable graphite composite phase change heat-storing building material and preparation method thereof
InactiveCN101239798AGood chemical stabilityIncrease inertiaSolid waste managementHeat-exchange elementsFiberMicrowave
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.
Owner:SOUTH CHINA UNIV OF TECH
Method for preparing graphene oxide modified composite phase-change microcapsule
ActiveCN107417867AImprove thermal effectGood compatibilityHeat-exchange elementsMicroballoon preparationWater bathsCross-link
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.
Owner:SHAANXI UNIV OF SCI & TECH
Method of inducing nucleation of a material
Methods of inducing nucleation of a material is provided. The disclosed methods comprise the steps of bringing the material to a temperature near or below a phase transition temperature and altering the pressure to induce nucleation of the material. The disclosed methods are useful in freeze-drying processes, particularly pharmaceutical freeze-drying processes.
Owner:SP IND INC
Method of producing liquid crystal display device
ActiveUS20130196565A1Drop in display qualityImage stickingVessels or leading-in conductors manufactureNon-linear opticsLiquid crystallineLiquid-crystal display
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).
Owner:MERCK PATENT GMBH
Method for preparing vanadium dioxide film
InactiveCN104032278AImprove performanceGood repeatabilityVacuum evaporation coatingSputtering coatingVanadium dioxideTransmittance
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.
Owner:SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
Method for improving planar orientation of cholesteric liquid crystal based on phase transition between smectic phase and cholesteric phase
InactiveCN102508378AImprove orderImprove transmittanceLiquid crystal compositionsNon-linear opticsLiquid-crystal displayOptical property
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.
Owner:UNIV OF SCI & TECH BEIJING
Non-synthetic method for modifying properties of liquid crystals
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.
Owner:KENT STATE UNIV
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