33results about How to "Improve discoloration efficiency" patented technology

The invention discloses a preparation method of an ITO / WO3 nano composite electrochromic film having a nano mosaic structure. The preparation method comprises the following steps: (1) dissolving prepared ITO nanocrystals in a nonpolar organic solvent to obtain a nanocrystal solution; (2) adding a polar solvent DMF and a ligand exchanger nitronium tetrafluoroborate into the nanocrystal solution, and performing standing or low-speed centrifugal treatment, so that the ITO nanocrystals are transferred into the polar solvent DMF to form an ITO nanocrystal DMF solution; (3) adding a tungsten source precursor into the ITO nanocrystal DMF solution to form a composite solution; (4) adding ethanol into the composite solution to regulate the viscosity and surface tension; (5) coating the solution obtained in the step (4) on a substrate through a spin coating method, a pulling method or a spray coating method to form a wet film; and (6) annealing the wet film in air to obtain the WO3 film. The invention also discloses the ITO / WO3 nano composite electrochromic film prepared through the above method. The preparation method disclosed by the invention is simple and low in cost, thereby being suitable for industrial production.

Disclosed are an electrochromic device and a manufacturing method therefor. The disclosed electrochromic device may comprise: a first electrochromic layer made of a first electrochromic agent; and a second electrochromic layer located on at least one surface of the first electrochromic layer and made of at least one of a second electrochromic derivative and a second electrochromic agent.

The invention discloses polytungstate-hydrotalcite composite photochromic ultrathin film and a preparation method thereof and belongs to the technical field of inorganic composite photochromic materials. The preparation method includes the steps of preparing hydrotalcite stripped with formamide solvent; preparing polytungstate-superpolymer complex solution; and alternately assembling processed substrates with positive charge in the two solutions to obtain the polytungstate-hydrotalcite composite photochromic ultrathin film. The polytungstate-hydrotalcite composite photochromic ultrathin film is fine in photochromism, short in response time, fine in reversibility and high in chromic amplitude, and both chromic strength and thickness of the film can be precisely controlled by changing assembly times.

The invention discloses a preparation method of an efficient color-changing silk-screen printing molybdenum-doped tungsten oxide nano-structure electrochromic film. According to the technical scheme,the method is characterized by comprising the following steps: dissolving tungstic acid in hydrogen peroxide, carrying out oil bath heating and stirring until a clear solution is obtained, adding molybdenum oxide, ethylene glycol and deionized water into the clear solution; then heating an oil bath pot, performing reflux condensation to obtain molybdenum-doped tungsten oxide nano sol, and outperforming centrifugation and washing the sol for later use; dissolving ethyl cellulose in ethanol at room temperature, stirring the mixture to obtain clear and transparent sol, adding terpilenol and the molybdenum-doped tungsten oxide nano sol prepared in the previous step into the sol, and carrying out rotary evaporation on an organic solvent to obtain molybdenum-doped tungsten oxide nano slurry; uniformly coating the molybdenum-doped tungsten oxide nano slurry on an ITO or FTO conductive glass substrate by adopting a silk-screen printing or blade coating method, then calcining the substrate byusing a muffle furnace and naturally cooling the substrate to obtain the molybdenum-doped tungsten oxide nano-structure electrochromic film.

The invention relates to a nanometer complex phase photochromic material and its preparation method. The material comprises polyurethane and a core-shell structured WO3, ZnO and ZnS nano-material. Specifically, the inner core of the nano-material is WO3, ZnO or ZnS nanoparticles with a particle size of 10-50nm. The shell of the nano-material is a surface dressing agent or also called surface modifier, and has thickness of 3-10nm. The nano-material accounts for 0.5%-6% of the total weight of the nanometer complex phase photochromic material. The photochromic material provided in the invention not only changes color under ultraviolet light radiation, but also can change color under visible light, and the color change process has the advantages of short color change time, high response sensitivity, long cycle life, abundant color change and the like.

The invention discloses a preparation method of an Al2O3 / WO3 nano composite electrochromic film having a mosaic structure. The preparation method comprises the following steps: 1) dissolving Al2O3 nanoparticle powder in water through ultrasonic dispersion to form an Al2O3 nanoparticle water solution; 2) adding ammonium metatungstate into the Al2O3 nanoparticle water solution, performing ultrasonic treatment to form a precursor composite solution; 3) adding ethanol and polyethyleneglycol into the precursor composite solution, and performing ultrasonic treatment to regulate the viscosity and surface tension of the solution; 4) preparing a wet film on a conductive substrate through a spin coating method or a pulling method or a spray coating method; and 5) performing heat treatment on the wet film in air to obtain the Al2O3 / WO3 nano composite electrochromic film. The invention also discloses the Al2O3 / WO3 nano composite electrochromic film prepared through the above method. The preparation method disclosed by the invention is simple, can easily realize film forming on various substrates of different shapes, is low in material consumption and is low in cost, thereby being suitable for industrial production.

The invention belongs to the field of materials, and in particular relates to a photochromic material and its application. The material is prepared according to the following method: a) mixing tungsten and / or molybdenum source compounds, a surfactant and a solvent to obtain a first solution; A surfactant is mixed with an acid solution to obtain a second solution; the surfactant is selected from lignosulfonate, heavy alkylbenzenesulfonate, alkylsulfonate, cetyltrimethylammonium bromide , sodium dodecylbenzene sulfonate, polyvinylpyrrolidone, polyvinyl alcohol, disodium edetate, lauroyl glutamic acid, sodium octadecyl sulfate and sodium fatty alcohol polyoxyethylene ether sulfate one or more; b) adding the second solution dropwise to the first solution to obtain a photochromic material. The photochromic material provided by the invention has high discoloration efficiency, and the material will not produce secondary pollution such as waste water during the preparation process, and is very suitable for application in the fields of decoration materials, information storage materials, laminated glass and the like.

The invention discloses a preparation method of a low-energy-consumption screen-printed molybdenum-doped tungsten oxide nano-structure electrochromic film. According to the technical scheme, the method is characterized by comprising the following steps of: dissolving tungstic acid in hydrogen peroxide, performing oil bath heating and stirring until a clear solution is obtained, adding molybdenum oxide, ethylene glycol and deionized water into the clear solution, heating an oil bath pot, conducting reflux condensation to obtain a molybdenum-doped tungsten oxide nano sol, and conducting centrifugation and washing for standby use; dissolving ethyl cellulose in ethanol at room temperature, performing stirring to obtain a clear and transparent sol, adding terpilenol and the molybdenum-doped tungsten oxide nano sol prepared in the previous step into the sol, and carrying out rotary evaporation of an organic solvent to obtain a molybdenum-doped tungsten oxide nano slurry; and uniformly attaching the molybdenum-doped tungsten oxide nano slurry to an ITO or FTO conductive glass substrate by adopting a silk-screen printing or blade coating method, conducting calcining by using a muffle furnace, and performing natural cooling to obtain the low-energy-consumption screen-printed molybdenum-doped tungsten oxide nano-structure electrochromic film.