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101 results about "Vanadium dioxide" patented technology

Vanadium(IV) oxide or vanadium dioxide is an inorganic compound with the formula VO 2. It is a dark blue solid. Vanadium (IV) dioxide is amphoteric, dissolving in non-oxidising acids to give the blue vanadyl ion, [VO] 2+ and in alkali to give the brown [V 4 O 9] 2− ion, or at high pH [VO 4] 4−.

Bifunctional chiral super-structure surface capable of switching polarization conversion and wave absorption

The invention discloses a bifunctional chiral metamaterial surface capable of switching polarization conversion and wave absorption, and belongs to the technical field of electromagnetic metamaterials. The method is used for solving the problem that most existing chiral super-structure surfaces cannot realize dynamic adjustability and quantitative controllability and cannot have dual functions of polarization conversion and wave absorption at the same time. The super-structure surface unit structure is composed of a graphene film layer, a gold-vanadium dioxide resonance layer, a silicon dielectric layer and a bottom-layer continuous gold film. Switching of two functions of polarization conversion and wave absorption is realized by changing the conductivity of vanadium dioxide; polarization conversion and dynamic regulation and control of the wave absorbing efficiency are realized by changing the Fermi level of the graphene; quantitative controllability of polarization conversion and a wave absorbing function is realized by controlling a function weighting function. Besides, the chiral super-structure surface also has the advantages of incident angle robustness, small thickness and small size, has double functions of broadband, and has potential application value in the fields of optical devices, communication equipment, biomedical sensors and the like.
Owner:CHANGSHU INSTITUTE OF TECHNOLOGY

Method for large-scale preparation of monoclinic phase vanadium dioxide nano-powder, heat insulation film and application of heat insulation film

The invention belongs to the field of functional nano materials, and relates to a method for large-scale preparation of monoclinic phase vanadium dioxide nano powder, a heat insulation film and application of the heat insulation film, and large-scale preparation of the monoclinic phase vanadium dioxide nano powder is successfully achieved by combining a coprecipitation method with low-temperature calcination. The obtained product has excellent size uniformity (the average particle size is 65 + / -10 nm) and an adjustable phase change characteristic (61-68 DEG C). The polymer-based composite film prepared based on the nano powder shows excellent optical performance, and the method has the advantages of mild reaction conditions (less than or equal to 600 DEG C), controllable product morphology and phase transition temperature and the like, and provides a reliable solution for industrial production of nano functional materials for intelligent windows.
Owner:HENAN UNIVERSITY

Intelligent early warning cable and preparation method thereof

The invention discloses an intelligent early warning cable and a preparation method of the intelligent early warning cable, and belongs to the technical field of cables. The flame-retardant polyolefin composite material is prepared from the following raw materials in parts by weight: 5 to 10 parts of ethylene-vinyl acetate copolymer, 10 to 20 parts of linear low-density polyethylene, 10 to 15 parts of ethylene-octylene copolymer, 3 to 8 parts of compatilizer, 15 to 20 parts of organic modified vanadium dioxide, 30 to 40 parts of ionic liquid modified aluminum hydroxide, 1 to 1.5 parts of cross-linking agent and 1 to 2 parts of lubricant. Organic modified vanadium dioxide is introduced into a sheath layer material to serve as an intelligent early warning material, the cable sheath layer is endowed with the temperature change characteristic, when the local temperature of the cable is abnormally increased due to overload and other reasons, the material can trigger color change, and therefore a striking visual mark is formed in a complex wire harness, and the early warning effect is improved. And the problems of lag, low efficiency and existence of blind areas of the traditional monitoring means are solved.
Owner:GUANGZHOU AOTONG WIRE & CABLE CO LTD

Composite ultrathin full-transparent intelligent interlayer and preparation method thereof

The application relates to a composite ultrathin full-transparent intelligent intermediate connecting layer, which comprises, from top to bottom, a first composite electrode, a photonic management composite tunneling layer and a second composite electrode; the first composite electrode is a grid-shaped transparent conductive film formed by reducing graphene oxide and silver nanowires, wherein the diameter of the silver nanowires is 20-40 nm, the length is 15-40 mu m, and the mass ratio of the reducing graphene oxide to the silver nanowires is 1:3 to 1:6; the photonic management composite tunneling layer is a zinc oxide matrix embedded with perovskite quantum dots; and the second composite electrode is an intelligent response electrode formed by combining aluminum-doped zinc oxide and vanadium dioxide; through accurate regulation of the material and structure, the application realizes >88% light transmittance and <35 Omega / sq square resistance, and simultaneously has the functions of photonic down-conversion and intelligent thermal management, thereby significantly improving the performance and stability of a stacked battery.
Owner:CNBM RESEARCH INSTITUTE FOR ADVANCED GLASS MATERIALS GROUP CO LTD

Invisible coating material for aviation aircraft

PendingCN121379324APolyurea/polyurethane coatingsCamouflage paintsVanadium dioxideNanowire
The invention discloses a stealth coating material for aviation aircrafts. According to the invention, a three-layer composite structure design is adopted; the intelligent sensing layer is composed of graphene quantum dots and a piezoelectric nanofiber composite network, so that real-time sensing of electromagnetic wave signals is realized; the tunable metamaterial layer comprises a liquid crystal elastomer matrix and nickel-titanium alloy nanowires dispersed in the liquid crystal elastomer matrix, and electromagnetic parameters of the material are dynamically adjusted by applying an electric field or a temperature field; vanadium dioxide nanoparticles, a photonic crystal structure and carbon nanotube aerogel are integrated in the multispectral stealth layer, and radar, infrared and visible light multispectral synergistic stealth is achieved. The coating is further integrated with a microencapsulation repairing agent and an intelligent control system, and has the self-repairing and self-adaptive adjusting functions. Compared with the prior art, 0.1-40 GHz ultra-wide frequency band radar wave absorption is achieved, the radar cross section is reduced by 25-30 dB, the infrared radiation characteristic is reduced by 80% or above, the surface density is only 1.2-1.5 kg / m, the weight is reduced by 65% compared with a traditional coating, and a key material technical support is provided for a new generation of stealth aircrafts.
Owner:HEBEI AEROSPACE DEFENSE AVIATION MANUFACTURING TECHNOLOGY CO LTD

Preparation method of diffused island distribution vanadium dioxide thermochromic film

The application relates to a preparation method of a diffused island-shaped vanadium dioxide thermochromic film. The preparation method comprises the following steps: a precursor forming step: forming a vanadium oxide film with a thickness of 20-100 nm as a precursor on the surface of a substrate by a magnetron sputtering method, a thermal deposition method or a laser-induced vapor deposition method; a pretreatment step: heating the film to 600-950 DEG C at a temperature increasing rate of more than 80 DEG C / min in an annealing furnace with a pressure of 50 mTorr or less, then keeping the temperature for 5-30 min, and then cooling the film to 300-450 DEG C in the furnace to form the film into a diffused island shape; and an oxidation step: introducing oxygen into the annealing furnace to oxidize the film to obtain a vanadium dioxide film. The film prepared by the preparation method of the vanadium dioxide thermochromic film has good sunlight modulation efficiency and good light transmittance.
Owner:HUBEI JINJING NEW MATERIAL TECH CO LTD

Metal oxide composite sodium ferric sulfate positive electrode material as well as preparation method and application thereof

The invention discloses a metal oxide composite sodium ferric sulfate positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of sodium ion battery positive electrode materials. The metal oxide composite sodium ferric sulfate positive electrode material comprises the following raw materials in parts by mass: 1-20 parts of sodium sulfate, 2-40 parts of ferrous sulfate, 0.05-1 part of an antioxidant, 0.05-1 part of a carbon source and 0.01-2 parts of metal oxide, the metal oxide is at least one of ferrous oxide, ferric oxide, ferroferric oxide, manganese oxide, manganese dioxide, cobalt oxide, cobaltosic oxide, cobaltic oxide, vanadium monoxide, vanadium dioxide, vanadium trioxide, vanadium pentoxide, nickel oxide and copper oxide. The invention also discloses a preparation method and application of the metal oxide composite sodium ferric sulfate positive electrode material. The method provided by the invention can solve the problems of low conductivity and specific capacity of the existing sodium ferric sulfate positive electrode material, and has the advantages of low cost, strong process adaptability and wide application prospect.
Owner:CHENGDU UNIV

Method for preparing m-phase vo2 film by photo-assisted spray pyrolysis and m-phase vo2 film prepared by the method

The application provides a method for preparing an M-phase VO2 film by a light-assisted spray pyrolysis method and the M-phase VO2 film prepared by the method, and belongs to the field of nanometer materials. The method comprises the following steps: (1) preparing a vanadium dioxide spraying liquid: adding vanadium oxyacetonylacetone into anhydrous methanol, stirring and aging to obtain a vanadium dioxide spraying liquid with ultraviolet photosensitive properties; (2) preparing a vanadium dioxide film: introducing the vanadium dioxide spraying liquid in step (1) into an atomizer and spraying onto a substrate coated with a TiO2 anatase phase under ultraviolet light irradiation to obtain the M-phase VO2 film. The method enables vanadium ions to be chelated in the sol by stirring, and the vanadium dioxide spraying liquid has ultraviolet photosensitive properties. The purity of the VO2(M) film is improved by introducing a titanium dioxide transition layer, and the microstructure of the VO2(M) film is improved by ultraviolet light irradiation, thereby improving the visual transmittance and solar light regulation rate of the VO2(M) film.
Owner:PANZHIHUA UNIV

Portable mid-infrared pulse fiber laser, working method and laser system thereof

The invention provides a portable mid-infrared pulse fiber laser, a working method and a laser system thereof. The portable mid-infrared pulse fiber laser comprises a pumping source, a first convex lens, a dichroic mirror, a second convex lens, a rare earth ion doped fiber, a third convex lens, a fourth convex lens, a vanadium dioxide saturable absorber, a semiconductor heating sheet, a direct current power supply and a wire which are sequentially arranged along an optical axis. According to the working method, the temperature of the vanadium dioxide saturable absorber is controlled by starting electric control of the semiconductor heating sheet and adjusting the control voltage of the direct-current power supply; when the temperature reaches heat balance, a pumping source is started; the power of the pumping source is increased until the power threshold of the passive Q-switched pumping light is reached, and the dichroscope outputs mid-infrared passive Q-switched pulse laser. The laser system comprises the laser and a control circuit. Under the condition of low pumping power, high-peak-power, high-pulse-energy and nanosecond-level narrow-pulse-width mid-infrared passive Q-switched pulse fiber laser output is achieved; and the portability and the practicability of the laser are improved due to the portability and long-endurance design.
Owner:CHENGDU SIMON OPTICAL LASER TECHNOLOGY CO LTD

Fano resonance-based super-multilayer dielectric film structure optical refractive index sensor

PendingCN121275693APhase-affecting property measurementsIndium TrichlorideVanadium dioxide
The invention relates to the technical field of optical sensors, in particular to a super-multilayer dielectric film structure optical refractive index sensor based on Fano resonance. The device sequentially comprises a prism layer, a modified cerium oxide layer, a functional layer, an interface layer, a substrate layer and a to-be-detected dielectric layer from top to bottom, the prism layer is a rutile prism, the substrate layer is an SOI substrate, and in the to-be-detected dielectric layer, a to-be-detected medium comprises water and ethanol; the interface layer is arranged on the substrate layer in a coating manner, the functional layer comprises a plurality of groups of units obtained by alternate deposition, and each unit comprises a vanadium dioxide layer and an indium trichloride tetrahydrate doped SiO2 layer which are arranged in sequence. The invention provides an optical refractive index sensor with a super-multilayer dielectric film structure based on Fano resonance, and aims to solve the problems of relatively low sensor sensitivity caused by relatively high cost and poor binding force with oxide materials of precious metals used in traditional materials and relatively weak surface plasmons excited by some oxide materials in related technologies.
Owner:QINGDAO BINHAI UNIV

Phase-change material-based high-functionality transparent thermal radiative cooling film and method for manufacturing same

The present invention relates to a large-area radiative cooling film and a method for manufacturing same. The radiative cooling film can be produced to exhibit excellent emissivity and infrared transmittance, by synthesizing highly crystalline single-crystal vanadium dioxide through a chemical vapor deposition method, and optimizing the structure thereof, such as the vanadium dioxide pattern, spacing, and the thickness of each layer. In addition, the method for manufacturing a radiative cooling film can improve process speed and stability through a film thinning process based on dry transfer, and enables the manufacture of a large-area radiative cooling film.
Owner:KOREA INST OF MATERIALS SCI +1

Thermochromic smart window

PendingCN122302864AVanadium dioxideHome use
This invention discloses a thermochromic smart window, which contains at least one layer of thermochromic material. The core functional material of the thermochromic material is a core-shell structured thermochromic material, with doped vanadium dioxide nanoparticles as the core and a metal-organic framework as the shell. The thermochromic smart window of this invention exhibits high stability, good optical properties, and the ability to achieve synergistic photothermal response, making it particularly suitable for home use. Furthermore, its preparation method is simple, requires mild conditions, and is highly compatible with existing laminated glass manufacturing processes, facilitating industrialization. It not only responds to changes in ambient temperature but also sensitively responds to changes in solar radiation intensity, achieving intelligent regulation of solar thermal energy.
Owner:BEIJING UNIV OF CIVIL ENG & ARCHITECTURE +1

Manufacturing method of Vanadium Dioxide using tetra arc melting method

The present invention relates to a method for producing vanadium dioxide using a tetra-arc melting method. Unlike conventional methods that require complex wet processes, long-term high-temperature heat treatment, and multi-stage reduction conditions, this method provides vanadium dioxide with high crystallinity by concentrating electrical energy on a pellet during a short arc discharge time of within a few seconds. This highly crystallin VO₂ has an accurate phase transition temperature, making it effective for use in various applications such as smart windows, heat-blocking coatings, optical films, temperature sensors, thermal switching devices, and next-generation battery materials. Furthermore, the present invention is expected to be utilized across various industrial sites, as it enables the production of highly crystalline vanadium dioxide in a much shorter time compared to existing heat treatment-based technologies, despite its simple device configuration and low manufacturing costs.
Owner:ZERO ENERGY SOLUTION CO LTD

Reconfigurable broadband / multi-frequency terahertz wave absorber based on vanadium dioxide

The invention relates to the field of terahertz metamaterial devices, and provides a reconfigurable broadband / multi-frequency terahertz wave absorber based on vanadium dioxide. The wave absorber is composed of metamaterial square units which are arranged periodically, and adjacent units are gapless. Each unit is composed of six layers of structures including a vanadium dioxide resonance layer, an upper polyimide dielectric layer, a vanadium dioxide thin film layer, a copper resonance layer, a lower polyimide dielectric layer and a copper substrate layer. Vanadium dioxide can realize reversible phase change between a metal state and an insulation state through external excitation. In a metal state, the wave absorber has an ultra-wideband terahertz wave absorption function; and in an insulated state, a double-narrow-band absorption function is shown. According to the invention, the reconstruction of the absorption frequency and the bandwidth of the terahertz wave absorber is effectively realized, the problems of complex structure and fixed function of a traditional terahertz sensor are solved, and the potential of the terahertz wave absorber in sensing application of a single narrow-band wave absorber is further discussed.
Owner:GUILIN UNIV OF ELECTRONIC TECH

Vanadium dioxide temperature compensation gas flow sensor

The invention provides a vanadium dioxide temperature compensation gas flow sensor, and belongs to the field of sensor manufacturing. The sensor comprises a silicon substrate, a silicon oxide and silicon nitride layer, a heat insulation cavity, a heat insulation gap, a chromium adhesion layer, a vanadium dioxide temperature measurement resistor, a platinum heating resistor, a platinum environment temperature measurement resistor, a platinum wire and a platinum electrode, wherein a heating resistor is arranged in the center of the silicon oxide and silicon nitride layer suspended above the cavity, four vanadium dioxide temperature measurement resistors are symmetrically distributed on two sides of the heating resistor to form a Wheatstone bridge, a heat insulation gap is formed between the heating resistor and the temperature measurement resistors, and platinum environment temperature measurement resistors are distributed on the upstream and the downstream of the cavity area. When no gas flows in, chip heat distribution is symmetrical, and upstream and downstream vanadium dioxide temperature measuring resistors have the same resistance value; when gas flows in, the resistance value of upstream vanadium dioxide is increased, the resistance value of downstream vanadium dioxide is decreased, the Wheatstone bridge outputs voltage, the relation between the voltage value and the gas flow is recorded, and then the flow is compensated and corrected according to the values of the environment temperature measuring resistor and the heating resistor to obtain the final gas flow value.
Owner:BEIJING UNIV OF TECH

Multifunctional terahertz chiral metasurface based on vanadium dioxide and graphene and preparation method thereof

The invention discloses a multifunctional terahertz chiral metasurface based on vanadium dioxide and graphene, the metasurface is formed by periodically arranging M * N metasurface units with multilayer structures in an array, the metasurface units are in M * N two-dimensional distribution, and both M and N are positive integers; the metasurface unit comprises a metal substrate, a first dielectric layer, a graphene layer, a second dielectric layer and a resonant layer unit which are sequentially arranged from bottom to top. According to the metasurface, by reasonably utilizing the phase change characteristic of VO2 and the tunability of graphene, efficient multifunctional response is achieved, and the problems that a traditional metasurface is few in function, single in regulation and control mode and low in efficiency are solved. The invention further provides a preparation method of the multifunctional terahertz chiral metasurface based on vanadium dioxide and graphene.
Owner:XIAN UNIV OF TECH

Water-based cadmium ion-vanadium dioxide battery as well as preparation method and application thereof

The invention provides an aqueous cadmium ion-vanadium dioxide battery as well as a preparation method and application thereof, and relates to the field of ocean energy storage. The battery comprises a negative electrode, a positive electrode, a diaphragm and an aqueous electrolyte, the negative electrode is metal cadmium or cadmium-based alloy; the active material of the positive electrode is metastable monoclinic phase vanadium dioxide; the diaphragm is a glass fiber diaphragm; the aqueous electrolyte is an aqueous solution containing cadmium salt; the total concentration of the cadmium salt in the aqueous electrolyte is 1-4 mol / L. The aqueous vanadium dioxide-cadmium metal secondary battery disclosed by the invention has the advantages of safe aqueous electrolyte system, high rate capability, ultra-long cycle life and the like, and has remarkable advantages when being applied to ocean energy storage.
Owner:SANYA SCI & EDUCATION INNOVATION PARK WUHAN UNIV OF TECH

A multi-wavelength surface plasmon hot electron photodetector and a preparation method and application thereof

The present application relates to a kind of multi-wavelength surface plasmon hot electron photodetector and its preparation method and application, its structure includes substrate, two-dimensional material layer, vanadium dioxide micro-nano structure, graphene layer and top driving electrode.The detector realized by the present application not only has the characteristics such as wide spectrum, real-time tuning, room temperature operation and wavelength selectivity, and the detection performance is significantly improved.
Owner:DONGHUA UNIV

Vanadium dioxide-based terahertz broadband chiral absorber capable of being actively regulated and controlled

PendingCN121584271AAntennasOptical elementsVanadium dioxideTerahertz metamaterials
The invention discloses a vanadium dioxide-based terahertz broadband chiral absorber capable of being actively regulated and controlled, and belongs to the technical field of terahertz metamaterial design. The problems that an existing chiral terahertz absorber is narrow in absorption bandwidth and single in light absorption function are solved. The terahertz broadband chiral absorber sequentially comprises a reflection bottom layer, an intermediate dielectric layer and a top layer from bottom to top; the top layer is formed by arranging a plurality of structural units in an array; each structural unit is composed of a Z-shaped gold structure and four vanadium dioxide micron plates; the four vanadium dioxide micron discs are symmetrically arranged on the left side and the right side of the middle longitudinal arm respectively and attached to the edges of the left side and the right side of the middle longitudinal arm. The invention is used for the vanadium dioxide-based terahertz broadband chiral absorber capable of being actively regulated and controlled.
Owner:GUIZHOU MINZU UNIV

Self-adaptive thermal management systems and methods thereof

Embodiments described herein relate to a self-adaptive thermal management system. The thermal management system includes a first body, a second body, and a third body. The second body has a first layer and a second layer formed from a Weyl semimetal and a third layer sandwiched between the first layer and the second layer. The third layer is formed from a vanadium dioxide film. The second body is spaced apart from the first body. The third body is spaced apart from the second body. The second body is a modulator configured to transition between a metallic phase and an insulating phase dependent on a temperature to regulate a heat from the first body to the third body through the second body in a self-adaptive manner dependent on the temperature.
Owner:TOYOTA MOTOR ENG & MFG NORTH AMERICA INC +1

Preparation method and application of organic polymer composite vanadium-based aqueous zinc battery positive electrode

The application discloses a preparation method of an organic polymer composite vanadium-based water-based zinc battery positive electrode and application thereof. V2O5 powder is dissolved in deionized water, and continuous stirring is carried out until the V2O5 powder is completely dissolved, and the solution presents orange yellow. Then, 1,8-NDA powder is added into the solution twice, and continuous stirring is carried out until the 1,8-NDA powder is completely dissolved, and the solution presents yellow green. The solution is transferred into a hydrothermal kettle, and is placed into a vacuum drying box, and heated at 140 DEG C for 24 h. After cooling to room temperature, the solid product is centrifugally washed with deionized water and ethanol respectively, and finally, vacuum drying is carried out at 80 DEG C to obtain a VO2@NDA composite material. Since the conductive poly-1,8-NDA material tightly wraps the inner vanadium dioxide material, the composite material not only has excellent electronic conductivity, but also cannot be dissolved in a water-based electrolyte in a discharge product, and therefore, as a water-based zinc ion battery positive electrode material, the composite material presents significantly improved rate performance and cycle stability.
Owner:NINGBO UNIV

Multi-band terahertz absorber based on stacked structure of vanadium dioxide and graphene

The invention requests to protect a multi-band terahertz absorber based on a vanadium dioxide and graphene stacked structure, the absorber is of a layered structure stacked from top to bottom, the top layer is a graphene layer, the middle layer is an upper dielectric layer, a vanadium dioxide layer and a lower dielectric layer, and the bottom layer is a metal reflecting layer; the top graphene layer is of a windmill structure with four rectangular grooves; the whole structure is square, the four grooves are distributed in a central symmetry mode along the cross center, and regulation and control over current distribution on the surface of graphene are achieved. The vanadium dioxide layer in the middle layer comprises four cross-shaped units, and the four cross-shaped units are in central symmetry along the array period and are arranged at equal intervals; each cross-shaped unit is integrally formed by a transverse arm and a longitudinal arm which are perpendicular to each other, and the longitudinal arm and the transverse arm are equal in width to form a symmetrical cross-shaped pattern; the dielectric layers are all made of polyethylene cycloolefin copolymer materials, and the bottom metal reflecting layer is a full-coverage gold layer.
Owner:CHONGQING UNIV OF POSTS & TELECOMM

Tungsten-doped vanadium dioxide layer radiant heat management film

A tungsten-doped vanadium dioxide layer radiant heat management film comprises a metal base layer; the tungsten-doped vanadium dioxide layer is arranged above the metal base layer; the first germanium layer is arranged above the tungsten-doped vanadium dioxide layer; the zinc sulfide layer is arranged above the germanium layer; the quasi-periodic structure layer is arranged above the zinc sulfide layer, and the quasi-periodic structure layer is formed by alternately stacking calcium fluoride layers and second germanium layers; through the room temperature phase change characteristic of the tungsten-doped vanadium dioxide layer, passive switching of the tungsten-doped vanadium dioxide layer radiant heat management film between relatively high emissivity cooling in the daytime and relatively low emissivity heat preservation at night is achieved. Through the room temperature phase change characteristic of W-VO2, passive switching between daytime high-emissivity cooling and night low-emissivity heat preservation is achieved, and the problems that in the prior art, a radiant heat management device is low in emissivity and cannot be manufactured on a large scale are solved.
Owner:TIANJIN UNIVERSITY OF TECHNOLOGY

Thermally-induced phase change material, preparation method and application thereof and thermally-induced phase change coating of automobile heat insulation glass

The invention provides a thermally induced phase change material, a preparation method and application thereof and a thermally induced phase change coating of automobile heat insulation glass, and relates to the technical field of new materials of automobiles and automobile spare parts, the thermally induced phase change material based on a VO2 (at) SiO2 core-shell structure is of a core-shell structure, and comprises an inner core and a shell layer wrapping the outer surface of the inner core; the inner core comprises a tungsten doped-vanadium dioxide nano core, and the shell layer comprises silicon dioxide. The phase change temperature of the material is reduced to be close to the room temperature through doping of high-valence elements, the chemical stability of the material is improved through the core-shell structure, and the optical performance is synergistically improved.
Owner:CHINA FAW CO LTD

Composite thermochromic film and preparation and application thereof

PendingCN121801554Areduce transmittanceWeak ability to heat the interior of the houseTenebresent compositionsParaffin waxVanadium dioxide
The invention discloses a composite thermochromic film as well as preparation and application thereof. The composite thermochromic film is prepared from tungsten-doped vanadium dioxide, polyvinyl alcohol and paraffin. The film can be tightly adhered to an adhesion surface, and has a function of adjusting the transmissivity of visible light and near-infrared light.
Owner:SHANGHAI INST OF TECH

Nanocellulose modified vanadium dioxide dispersion liquid as well as preparation and application thereof

The invention discloses a nanocellulose modified vanadium dioxide dispersion liquid as well as preparation and application thereof. The dispersion liquid is prepared from vanadium dioxide powder, water-based resin emulsion, nanocellulose, a composite antioxidant and multiple auxiliaries. According to the preparation method, an in-situ co-grinding process is creatively adopted, a high-energy shearing force in a grinding process is utilized to induce nano-crystalline cellulose to generate immediate adsorption on a new high-energy surface generated by crushing vanadium dioxide particles, a microcapsule type compact coating structure is constructed, and a three-dimensional network is formed in a dispersion liquid. According to the method, the oxidation resistance and the storage stability of the dispersion liquid are remarkably improved, and the core problem that the vanadium dioxide water-based paint is prone to oxidation discoloration and sedimentation layering is solved.
Owner:HAIAN XINBOSI SOLID WASTE UTILIZATION TECH CO LTD

A dual-ion regulated vanadium dioxide nanowire electrode material, a preparation method and application thereof

This invention relates to the field of electrode materials technology, and particularly to a method for preparing a dual-ion-controlled vanadium dioxide nanowire electrode material. The steps are as follows: S1, dissolve a vanadium source in oxalic acid solution to form a first solution, and stir the first solution in a water bath at 80℃±10℃ for 1-2 hours until the overall color of the first solution changes from orange to dark blue; S2, simultaneously add an aluminum source solution and a zirconium source solution dropwise to the dark blue first solution, and stir at room temperature for 10 minutes to obtain a second solution; S3, transfer the second solution obtained in step S2 to a high-pressure reactor, heat it uniformly to 140℃-220℃, maintain the temperature for 1-6 hours, and allow it to cool naturally to room temperature after the reaction. Wash the reaction product with ethanol and deionized water, and then vacuum dry it at 80℃ for 24 hours to obtain the dual-ion-controlled vanadium dioxide nanowire electrode material. The dual-ion-controlled vanadium dioxide nanowire electrode material provided by this invention has both specific capacity and cycle stability, and has good application value.
Owner:LONGYAN UNIV

Vanadium dioxide-based micro-nano fiber temperature sensor and preparation method thereof

This invention belongs to the field of micro / nano fiber fabrication technology. It discloses a vanadium dioxide-based micro / nano fiber temperature sensor and its fabrication method, including the following steps: (1) After removing a portion of the coating layer on the surface of a single-mode fiber, the fiber cladding in the area where the coating layer has been removed is etched or the area where the coating layer has been removed is heated and stretched using a melt stretching method to obtain a micro / nano fiber; (2) Vanadium metal is deposited onto the etched or stretched area of ​​the micro / nano fiber by magnetron sputtering to obtain a vanadium metal film with a nanometer-level thickness; (3) The deposited micro / nano fiber is annealed in an inert atmosphere to transform the vanadium metal film into an M-phase vanadium dioxide film, thereby obtaining a micro / nano fiber temperature sensor. This invention uses a method of magnetron sputtering to deposit a metal film followed by tube furnace annealing to obtain a vanadium dioxide thin film. The vanadium dioxide thin film can be prepared in a controllable manner, and the pure vanadium dioxide M-phase thin film can be prepared stably and repeatedly. Moreover, the thickness of the coating can be selected independently.
Owner:HUAZHONG UNIV OF SCI & TECH

Multilayer phase change all-year energy-saving material and preparation method thereof

The application discloses a multilayer phase change all-year energy-saving material and a preparation method thereof. The material comprises, from inside to outside, a carbonized substrate layer, a radiation energy collecting layer and a phase change radiation switch layer. The carbonized substrate layer is made of carbonized material slurry. The raw materials of the phase change radiation switch layer comprise modified nano vanadium dioxide 0.5-25 parts, a polymer substrate 20-60 parts, acetone 130-200 parts and zirconium dioxide 0.2-15 parts in terms of mass fraction. In the multilayer phase change all-year energy-saving material, the phase change radiation switch realizes the switch change of transmission and reflection at different temperatures through the spectrum change of the phase change material. The material has good radiation refrigeration function in summer, has solar reflectivity of more than 90% and atmospheric window emissivity, has solar transmittance of more than 70% in winter, absorbs solar heat through the radiation energy collecting layer to realize building heat absorption, and realizes all-year energy saving.
Owner:WUHAN UNIV OF TECH

Electronic control independent coding metasurface and real-time terahertz regulation and control

The invention discloses an electrically-controlled vanadium dioxide metasurface holographic device. The electrically-controlled vanadium dioxide metasurface holographic device comprises device units arranged in an array shape. The device unit comprises a sapphire substrate (5), a windmill structure resonator (1) integrated on the surface of the sapphire substrate (5) and a gold patch (2); the four sides of the windmill structure resonator (1) are respectively provided with four branches; electrodes (3) are respectively distributed on four sides of the sapphire substrate (5); vanadium dioxide patches (4) are filled in openings between the two branches of the adjacent gold patches (2) of the windmill structure resonator (1) and the electrodes. The electronic control vanadium dioxide metasurface device has the advantages of simple structure, low manufacturing difficulty, electronic compatibility and the like.
Owner:UNIV OF SHANGHAI FOR SCI & TECH