10results about How to "Simple preparation conditions" patented technology

The invention discloses a preparation method and application of a porous para-aramid nanofiber membrane. The preparation method of the para-aramid nanofiber membrane comprises the following steps: placing a substrate coated with an aramid nanofiber solution in an aprotic solvent to obtain an aramid nanofiber membrane containing the aprotic solvent; and immersing the aramid nanofiber membrane containing the aprotic solvent into a protic solvent, replacing the aprotic solvent in the nanofiber membrane with the protic solvent, and heating and drying to obtain the para-aramid nanofiber membrane. The para-aramid nanofiber membrane prepared by the preparation method of the para-aramid nanofiber membrane has highly adjustable porosity and pore structure, and has a huge application prospect in the fields of battery diaphragm and membrane separation and the like, and the preparation method is simple and suitable for large-scale industrial application.

The present application relates to a kind of preparation methods of perovskite film, comprising the following steps: mixing imidazolium ionic liquid and lead halide in container according to the proportion of 1:1, adding DMF or DMSO solvent, heating and stirring, then adding first solvent and precipitating white precipitate, drying white precipitate to obtain white powder. White powder is mixed with at least one of MAI, FAI, CsI cation salt and second solvent, to configure perovskite precursor solution, after heating and stirring, filtering, placing filtrate in oven, to obtain perovskite crystal material. Perovskite crystal material is placed in tank, then methanamine vapor is introduced, to obtain perovskite intermediate, then the perovskite intermediate is dissolved in acetonitrile, to obtain acetonitrile mixed solution. Acetonitrile mixed solution is spin-coated or blade-coated on substrate, to obtain perovskite film layer. The present application also discloses perovskite assembly prepared by the method. The present application can prepare perovskite film in air environment without annealing treatment.

The invention provides a preparation method and application of a citric acid modified Cd-MOF material, and belongs to the technical field of metal organic framework materials. The citric acid modified beta-cyclodextrin metal organic framework (CA-beta-CD-MOF) is synthesized by adopting a chemical grafting and steam diffusion method, and the adsorption performance and the reusability of the citric acid modified beta-cyclodextrin metal organic framework (CA-beta-CD-MOF) are systematically researched. Parameters such as concentration, dosage, pH and the like of citric acid are associated, the adsorption effect of the citric acid on heavy elements in a portable solution is investigated, and the adsorption capacities of the citric acid on anionic dye Congo red (CR) and heavy metal ions (Cu < 2 + >) are as high as 900.9 and 287.4 mg.g <-1 > respectively. The citric acid modified beta-cyclodextrin metal organic framework (CA-beta-CD-MOF) obtained by the invention has the characteristics of being simple, green, environment-friendly and reusable, has excellent adsorption performance, and can be used for simultaneously removing organic dye and heavy metal ion pollution in water.

The invention relates to high-purity cordierite ceramic powder and a preparation method thereof. The preparation method of the high-purity cordierite ceramic powder comprises the following steps: (1) preparing high-purity and high-reactivity MgO powder, Al2O3 powder and SiO2 powder according to chemical components of cordierite, mixing, drying and screening to obtain mixed raw material powder; (2) carrying out primary high-temperature reaction on the mixed raw material powder at 1200-1400 DEG C to reduce the sintering activity of the powder, cooling, and carrying out dry pressing to obtain a biscuit block; (3) carrying out secondary high-temperature reaction on the biscuit block at 1450-1460 DEG C so as to enable the interior of the biscuit to be partially molten and generate a liquid phase, and cooling to obtain a loose and breakable high-purity cordierite block; and (4) crushing the high-purity cordierite block to a target particle size to obtain the high-purity cordierite ceramic powder.

This application provides a method for preparing decellularized pericardium, employing a combination of specific pretreatment, sterilization, defatting, decellularization, and freeze-drying processes. This method effectively removes antigenic substances from animal tissues while maximally preserving the integrity of bioactive components and structures in the material. Simultaneously, the preparation process effectively incorporates inorganic metal ions, polysaccharides, and drugs to prevent adhesions. The resulting decellularized pericardium possesses both natural rough and smooth surfaces. The smooth surface has a dense fibrous structure, effectively blocking the invasion of adhesion tissues without affecting tendon function. The rough surface allows tissue ingrowth, facilitating rapid vascularization and tendon repair. Furthermore, the decellularized pericardium is loaded with functional components, further promoting tendon healing and preventing adhesions.

This invention belongs to the field of valuable metal recovery and water purification technology, and more specifically, relates to an organically covalently cross-linked alginate fiber, its preparation method, and its applications. This invention prepares alginate fibers with good water resistance through organic covalent cross-linking technology, which can be used for the recovery of valuable metals from aqueous solutions, the removal of heavy metals, the softening of drinking water, and the removal of cationic organic pollutants. It can solve the problem of calcium content in existing alginate fibers. 2+ The alginate adsorbent material prepared by ion crosslinking technology suffers from a large number of sacrificed adsorption sites, resulting in low adsorption capacity and limiting its widespread application. The organic covalently crosslinked alginate fiber designed and synthesized in this invention has the characteristics of fast adsorption rate, excellent adsorption performance, and easy solid-liquid separation. Moreover, the organic covalently crosslinked alginate fiber can be regenerated and reused.

This invention discloses a simple method for preparing nano-petal-shaped spherical tin dioxide powder material. (1) Stannous sulfate powder is added to deionized water and mixed to obtain solution A; (2) Sodium carbonate or potassium carbonate is added to deionized water and completely dissolved to form solution B; (3) Solution A obtained in step (1) and solution B obtained in step (2) are thoroughly mixed and stirred continuously; (4) The solution obtained in step (3) is allowed to stand and separate into layers, the supernatant is removed, the concentrated high-concentration suspension is centrifuged and washed and the precipitate is collected, and the precipitate is dried to obtain precursor powder; (5) The precursor powder obtained in step (4) is calcined and heat-treated to completely transform the precursor powder into a stable tin dioxide phase structure, thereby obtaining high-purity and uniform nano-petal-shaped spherical tin dioxide powder. The method of this invention is simple, mild, and easy to realize large-scale industrial production.

The application provides a SiC aerogel material, a preparation method and application thereof. The preparation method comprises the following steps: (1) taking silicon powder as a silicon source and a carbon-containing halide as a carbon source, mixing the silicon powder and the carbon-containing halide according to a proportion to obtain raw material powder, and obtaining mixed powder after pretreatment; (2) placing the obtained mixed powder into a combustion synthesis reaction kettle, then introducing high-purity argon with a certain pressure, igniting the mixed powder to occur combustion synthesis reaction through a tungsten wire coil, and obtaining a carbon-rich SiC aerogel block; and (3) oxidizing and removing carbon from the obtained carbon-rich SiC aerogel block at a certain temperature to obtain a layered nanowire-stacked SiC aerogel. The preparation method has the advantages of simple production process, short cycle, easiness in large-scale production, cheap and easily-obtained raw materials, and the obtained SiC aerogel has the characteristics of low density, high porosity, large specific surface area, good thermal stability and chemical stability, and has a wide application prospect in the fields of heat insulation, energy storage, catalysis, environment, electromagnetic wave absorption and electromagnetic interference shielding.

The application discloses a preparation method of a hierarchical pore double-heterojunction catalyst for enhancing photothermal catalytic carbon dioxide reduction, and the catalyst is obtained by confining a heterojunction precursor solution in polystyrene template channels with a three-dimensional ordered multilayer opal structure, and then through simple calcination treatment, a hierarchical pore S-type heterojunction / Schottky junction photothermal catalytic material with a macropore-mesopore structure is obtained. Compared with other zero-dimensional / two-dimensional photothermal catalytic materials, the heterojunction structure is expanded to a three-dimensional hierarchical porous frame structure, and the obtained photothermal catalytic material has unique advantages of controllable structure and adjustable loading, and provides abundant active reaction site centers for a photothermal catalytic process.