42results about How to "Wide range of discoloration" patented technology

The invention discloses monodisperse superparamagnetic nano crystal colloidal core-shell composite particles, which are monodisperse superparamagnetic nano cluster particles which are gathered by ferroferric oxide nanocrystalline. The surfaces of the particles are coated by polyvinylpyrrolidone. The preparation method of the composite particles comprises the following steps: adding trivalent iron salt to polyol mixture solution of polyvinylpyrrolidone and polyhydroxy compounds; agitating until the trivalent iron salt is completely dissolved; adjusting the pH value to 8.0-10.0, then carrying out enclosed heating to 180-240 DEG C, and carrying out heat preservation for 6-48 hours. The monodisperse superparamagnetic nano crystal colloidal core-shell composite particles disclosed by the invention can be assembled into different colors of photonic crystal in a magnetic control manner; the dependency level of the magnetic photonic crystal on the solvent polarity, the ion strength and the pH value can be reduced.

The invention provides a quasi-solid electrolyte for a flexible electrochromic film, a preparation method of the quasi-solid electrolyte, a flexible electrochromic film and a preparation method of theflexible electrochromic film. The quasi-solid electrolyte for the flexible electrochromic film comprises PVB resin, a dispersing agent, inorganic lithium salt, nano inorganic particles and an auxiliary agent, and the molecular weight of the PVB resin is 60000-200000. The quasi-solid electrolyte disclosed by the invention is good in ionic conductivity, light transmittance, film-forming property and cohesiveness, and the assembled flexible electrochromic film has a relatively large discoloration range at a low voltage and is excellent in overall performance.

The invention relates to a conductive and reflective layer and application thereof in an electrochromic rearview mirror. The conductive and reflective layer is mainly characterized by comprising a transparent metallic oxide layer, a metallic reflective layer, a transparent conductive layer and a high-refraction-rate layer in sequence, and one side of the high-refraction-rate layer can further comprise a low-refraction-rate layer and a second high-refraction-rate layer in sequence. The conductive and reflective layer has low loss of visible light. The electrochromic rearview mirror has a widercolor change interval and higher sensitivity.

The invention relates to a method for preparing an electrochromic device. The preparation method comprising the steps: (1), preparing a first transparent conductive layer; (2), preparing an electrochromic layer; to be specific, plating the surface of the first transparent conductive layer with an electrochromic film by using a plasma vacuum film-plating device to form an electrochromic layer; (3),preparing an ion conducting layer; (4), preparing an ion storage layer; to be specific, plating the surface of the ion conducting layer with an ion storage layer film by using a plasma vacuum film-platingg device to form an ion storage layer; (5), preparing a second transparent conductive layer; (6), preparing an ion barrier layer; (7), preparing an isolation layer; and (8), carrying out laser electrode etching. The method has the following advantage: the electrochromic device prepared by the preparation method has characteristics of wide discoloration range, high fading state transparency and fast discoloration speed.

The invention relates to a preparation and application of a novel viologen electrochromic material. The preparation method comprises the steps of taking 4,4'-bipyridyl as a raw material, and performing Menschutkin reaction with halogenated alkane to synthesize monosubstituted 4,4'-bipyridyl salt; then, importing aromatic groups into the monosubstituted 4,4'-bipyridyl salt to increase a conjugatedstructure of molecules, and then increasing the stability of the molecules and improving the radiation resistance and temperature resistance of molecular chains. In addition, along with the growth ofmolecular chains and the importing of the aromatic groups, the electron-deficient state on 4,4'-bipyridyl of the core group of the viologen compound is improved, a proper substituent is selected, different colors can be obtained by adjusting the molecular orbital energy level and the charge transfer capacity, and the possibility is provided for realizing multicolor display. The viologen electrochromic material obtained by the invention is higher in transmittance difference, quicker in color change, lower in color change voltage and longer in service life, and the electrochromic device preparedby using the viologen electrochromic material has outstanding color change performance and cost advantage.

The invention relates to a colloidal crystal thin film preparation method, in particular to an electrically expandable colloidal crystal thin film preparation method and solves the problem of difficulty in preparation of existing electrically expandable polymer materials. The method includes: step one, monodispersed polystyrene microsphere preparation; step two, ferrocenyl derivative synthesis; step three, electrically expandable colloidal crystal material preparation. The method is used for preparing electrically expandable colloidal crystal thin films.

The invention discloses an electrochromic material, a composition, a preparation method, an electrochromic device, a shell assembly and electronic equipment. The electrochromic material has a structural formula shown as a formula (I), wherein R1, R2, R3 and R4 are respectively and independently hydrogen, halogen, alkyl, haloalkyl or an oxygen-containing hydrocarbon functional group; Yis methyl, ethyl or one bond; and R6 and R7 are respectively and independently hydrogen, methoxy, methyl or trifluoromethyl. The electrochromic material has better durability, higher coloring state and transparentstate contrast and higher response speed, and is suitable for being applied to electronic equipment with higher requirements on discoloration/fading, such as mobile phones, mobile terminals or camerashooting equipment and the like.

The invention belongs to the technical field of intelligent electronic devices, and particularly relates to a flexible electroluminescent device capable of dynamically changing colors and a preparation method thereof. The preparation method comprises the following steps of uniformly blending electroluminescent powder and a polymer solution to obtain a composite active material, stacking double light-emitting layers with different dielectric constants on a flexible transparent conductive substrate layer by layer through a solution film forming method, and constructing an electrode layer on theupper layer to prepare the flexible electroluminescent device. In the process of increasing the intensity of a driven electric field, the light emitting color of the device can be changed from orangelight to white light in real time and then to blue light. The electroluminescent color-changing device provided by the invention has excellent flexibility and mechanical stability, and can be designedinto various shapes to display different patterns. The electroluminescent color-changing device can play a huge application potential in the field of intelligent wearable equipment for camouflage orfashion decoration and the like.

The invention discloses a preparation method of a vanadium-doped double-layer nickel oxide electrochromic film. The ratio of doped vanadium ions can be effectively controlled by controlling the sputtering power ratio of a vanadium target and a nickel target. NiO deposited in the lower layer of the film belongs to a crystalline state, crystal lattices of the film are closely arranged, the degree oforder is good, and the film is uneasy to degrade in the circulating process, therefore, the stability of the film with the structure in the circulating process is guaranteed. In conclusion, a synergistic effect between a crystalline film and the doped film can enable the electrochromic performance of the nickel oxide film to be obviously improved. The preparation method of the vanadium-doped double-layer nickel oxide electrochromic film is simple and convenient to operate, is easy to promote and plays very positive significance in commercial promotion of the NiO electrochromic film.

The invention relates to a polyaniline derivative and a preparation method thereof. The polyaniline derivative is characterized in that the components of the raw material comprise monomer aniline and monomer o-phenetidine, between which the quantity relative ratio is (0-1):(0-2). The preparation method comprises the following steps: achieving reduced pressure distillation of both the aniline and the o-phenetidine through a vacuum pump to obtain purified monomer aniline and monomer o-phenetidine; mixing the monomer aniline and the monomer o-phenetidine in proportion, adding deionized water into the mixture for dilution and then performing ultrasonography for half an hour; and dropping oxidant solution into the diluted mixture, pickling and leaching through dilute hydrochloric acid after reaction, then washing and leaching till the filtrate is colorless to obtain polymer powder, and drying the polymer powder in room temperature to obtain the polyaniline derivative. The invention has the benefits that on one hand, regulation and control of the electric conductivity of polyaniline are carried out in different orders of magnitudes, and on the other hand, the solubility of the polymer in different solvents is improved. The polyaniline derivative prepared by the method can be used for manufacturing electrochromic films with moderate electric conductivity, wide color change interval, long cycle time and high-speed response.