6results about How to "Crystal structure intact" patented technology

The invention provides an aromatic polyoxadiazole film and a preparation method and application thereof.The preparation method of the aromatic polyoxadiazole film comprises the following steps that fuming sulfuric acid serves as a solvent and a dehydrating agent, terephthalic acid and hydrazine sulfate serve as monomers, benzoic acid serves as a chain end-capping agent, step-by-step feeding is adopted, and three-stage condensation polymerization is conducted to obtain the aromatic polyoxadiazole film. An aromatic polyoxadiazole resin solution is obtained; pressurizing, orienting and conveying to a forming die head, extruding to obtain an acid-containing primary cast film, and solidifying and forming in a single-stage coagulating bath to obtain a polyoxadiazole wet film; washing the acid-free polyoxadiazole wet film to obtain an acid-free polyoxadiazole wet film; then biaxial stretching is conducted, heat setting treatment is conducted, and the aromatic polyoxadiazole film is obtained. After the aromatic polyoxadiazole film prepared by the method is carbonized and graphitized, the problem of'powder falling 'is avoided, and the prepared super-crystal graphite film is flat and uniform in appearance, more complete in crystal structure, higher in heat-conducting property, free of pollution to electronic elements and good in application prospect.

The invention discloses a metal ion doped manganese-based composite catalyst as well as a preparation method and application thereof. The catalyst is metal ion doped MnO2 in an epsilon crystal form; wherein the metal ion is any one of nickel, cobalt, potassium, sodium and lithium; and in the catalyst, the molar ratio of the manganese element to the metal ions is (1-3): 1. The obtained manganese-based composite catalyst has excellent long-term stability, is not easy to inactivate, shows excellent performance in various severe environments, and is very suitable for ozonolysis in the atmospheric environment.

The present disclosure relates to a kind of metal organic framework adsorption material and its preparation method and use, the method comprises: S1, the suspension of containing metal organic framework raw material is carried out ultraviolet irradiation treatment, obtain the light product;S2, the light product is carried out solid-liquid separation, obtain the solid product;Wherein, the wavelength of ultraviolet irradiation treatment is 200-400nm.The method provided in the present disclosure can efficiently and accurately regulate defect concentration, the crystal structure and morphology of the material prepared are intact, and have more active sites.The metal organic framework adsorption material provided in the present disclosure has excellent adsorption performance when used for adsorbing antibiotics.

The invention belongs to the technical field of new material preparation, and particularly discloses a high-entropy halogen-terminated MXene material and a preparation method thereof.The preparation method comprises the following steps that S1, a high-entropy MAX sample, an etching agent and molten salt raw materials are mixed according to the proportion, and then high-temperature annealing treatment is conducted under inert gas protection; s2, heating and washing with a washing solvent until impurities are removed, and then carrying out suction filtration and washing with ultrapure water until the solution is neutral; and S3, carrying out drying treatment to obtain the accordion-shaped multi-layer and single-end-group high-entropy MXene. According to the high-entropy halogen-terminated MXene material and the preparation method thereof, precise regulation and control of surface functional groups of high-entropy MXene are realized, and the application performance of the high-entropy halogen-terminated MXene material in the target fields of energy storage, catalysis and the like is improved by regulating and controlling the reaction temperature and the heat preservation time in the molten salt and directionally regulating and controlling the types of the surface functional groups of the product through the etching agent.

This invention proposes an ABX3 seed-induced crystallization perovskite thin film and a method for preparing the same for photovoltaic cells. The ABX3 seed-induced crystallization perovskite thin film contains potassium stannate. This ABX3 seed-induced crystallization perovskite thin film exhibits high crystallinity and good stability.

The application belongs to the technical field of functional materials and food safety, and particularly relates to a nano iron / titanium dioxide / cyclodextrin metal organic framework composite as well as a preparation method and application thereof. The gamma-cyclodextrin and alkali liquor are mixed in water to obtain a crystallization mother liquor of the cyclodextrin metal organic framework; then the nano ferroferric oxide and nano titanium dioxide are added into the crystallization mother liquor of the cyclodextrin metal organic framework, and ultrasonic mixing is performed to obtain a nano iron / titanium dioxide / cyclodextrin / potassium hydroxide composite solution; and then filtering and growth culturing are sequentially performed to obtain the nano iron / titanium dioxide / cyclodextrin metal organic framework composite. The nano iron / titanium dioxide / cyclodextrin metal organic framework composite exhibits significantly enhanced crystal growth kinetics characteristics, exhibits excellent renewable performance, and can be recycled through simple centrifugal separation, thereby overcoming the technical defects of the cyclodextrin metal organic framework material in the prior art.