35results about How to "Simple and mild preparation conditions" patented technology

The invention relates to a preparation method and application of a titanium dioxide coated ferric oxide composite material. The method comprises the following steps: synthesizing ferric oxide microspheres by using a hydrothermal method, and then separately coating the ferric oxide microspheres with a layer of amorphous titanium dioxide by a kinetic controlled water bath method; after that, carrying out heat treatment in an air atmosphere so as to obtain the crystal type titanium dioxide coated ferric oxide composite lithium ion battery anode material having a core-shell structure. The titaniumdioxide coated ferric oxide composite anode material prepared by the method effectively combines the high specific capacity of ferric oxide and the excellent cycle stability of titanium dioxide, thereby showing a higher specific capacity and stable cycle performance, and being an ideal lithium ion battery anode material; the material can be widely applied to lithium ion power batteries which require high energy density, long service life and high stability. Furthermore, the method provided by the invention is simple, mild in the conditions and lower in cost; the material has easily controlledmorphology structure and is suitable for mass production, thus having a good application prospect.

The invention discloses a preparation method of a titanium dioxide / iron oxide composite anode material. The preparation method sequentially comprises the following steps of (1) dissolving titanyl sulfate into deionized water, then, adding iron salt, and stirring until the iron salt is dissolved; (2) adding polyvinylpyrrolidone into the solution obtained in the step (1), and stirring until polyvinylpyrrolidone is completely dissolved; (3) dropwise adding methanamide into the solution obtained in the step (2) while fiercely stirring, and aging gel after stirring for 5-10 minutes; (4) drying the gel obtained in the step (3) under normal pressure at 50-70 DEG C for 22-26 hours to obtain a precursor product; and (5) heating the precursor product at the air atmosphere to 500-800 DEG C, keeping the temperature for 5-7 hours, and cooling to the room temperature to obtain the titanium dioxide / iron oxide composite anode material. The titanium dioxide / iron oxide composite anode material has relatively-high specific capacity and stable circulating performance.

The invention discloses an injectable thermosensitive chitosan / methylcellulose blend gel and a preparation method thereof. The gel is a physical gel, and its effective composition includes chitosan and methyl cellulose, and the weight percentages of the two are 0.25-2% and 0.25-5% respectively. The preparation method is to dissolve chitosan in an acid solution to obtain a 0.5-4wt% chitosan acid solution, and place it in an ice bath; dissolve the alkaline salt in a 0.5-10wt% methylcellulose solution, and Place in an ice bath; then slowly drop the methylcellulose salt solution into the chitosan acid solution under constant stirring to keep the solution free from turbidity, stir until the two are fully mixed, and centrifuge to remove air bubbles, then place the blended solution The gel is formed at the gel temperature. This new type of injectable temperature-sensitive gel has simple and mild preparation conditions, can avoid organic chemical reagents and other harmful substances, is suitable for the delivery of sensitive macromolecules such as protein drugs, and can also be used as an injectable medical material and tissue engineering scaffold materials.

The invention discloses a method for preparing binary and ternary high-performance composite aerogels by using iron tailings. The method comprises the following steps: mixing the iron tailings with sodium hydroxide for alkali fusion activation, cooling and washing with deionized water for solidification Liquid separation, after the washing liquid is allowed to stand for stratification, the supernatant liquid is separated from the lower mixed liquid, an acidic catalyst is added under alkaline conditions, and the wet gel is obtained by standing and aging, and the wet gel is subjected to solvent replacement and then dried under normal pressure to obtain Binary and ternary composite aerogels. The invention uses iron tailings as raw materials, has low price, wide sources, mild preparation conditions, simple process, low equipment requirements, is easy to realize industrialized preparation, and can simultaneously obtain binary and magnetic ternary composite silicon-based gas condensation; The tap density of the aerogel is less than 0.20g / cm 3 , the specific surface area of ​​binary aerogel and ternary aerogel can reach 986m, respectively 2 / g and 612m 2 / g, the adsorption capacity of methylene blue exceeds 300mg / g.

The invention discloses a preparation method of super-hydrophobic sponge for adsorbing an organic solvent. The preparation method comprises the steps: placing silica particles into a trihydroxymethylaminomethane buffer solution with the pH value of 7.8, and carrying out ultrasonic treatment and standing; then, sequentially adding a tannic acid solution and a silver nitrate solution into the solution; soaking polyurethane sponge into the mixed solution, carrying out stirring at room temperature for 2 h, taking out the polyurethane sponge, cleaning the polyurethane sponge several times by usingdeionized water, and then, cleaning the polyurethane sponge several times by using ethanol to obtain polyurethane sponge of which the surface has a micronano structure; and placing the treated polyurethane sponge into an ethanol solution having the volume concentration of 1:1000 and containing 1H,1H,2H,2H-perfluorododecanethiol, carrying out stirring at room temperature for 12 h, taking out the polyurethane sponge, cleaning the polyurethane sponge several times by using ethanol, and drying the polyurethane sponge to finally obtain super-hydrophobic polyurethane sponge of which the water contact angle is larger than or equal to 150 DEG. The preparation method is simple and convenient in preparation process and mild in conditions, and the regulation of hydrophobic property of the super-hydrophobic sponge can be realized by changing the concentration of a silica solution in a preparation process.

The invention relates to a catalyst for benzyl alcohol oxidation to synthesize benzaldehyde and its preparation method and application. Firstly, carbon source, manganese salt and acrylic acid are dissolved in deionized water, and hydrothermal reaction is carried out, and the solids generated after the reaction are passed through successively. Filtration, washing and drying to obtain the precursor of the manganese-carbon composite; adding the precursor of the manganese-carbon composite to potassium permanganate in a mass ratio of 1: (0.5-10) into deionized water, stirring and oxidizing at room temperature , and then filtered, washed and dried to obtain a catalyst for the oxidation of benzyl alcohol to benzaldehyde. In the present invention, a manganese-carbon composite precursor is synthesized in one step using manganese salt and carbon source as raw materials through a hydrothermal method with mild conditions, and then utilizes the strong oxidizing property of potassium permanganate to react at room temperature to obtain manganese dioxide / hydrothermal The carbon composite microsphere forms a catalyst for the oxidation of benzyl alcohol to synthesize benzaldehyde, and has simple operation, mild reaction conditions and low raw material cost.

The invention discloses a preparation method of a high-efficiency air absorbing material. The preparation method comprises the following steps: (1) after slurry is subjected to refining treatment, de-liquoring and concentrating, adding a sodium hydroxide solution in a concentrated solution, mixing and stirring, increasing the temperature to 80 DEG C, reacting for 1 hour and then neutralizing and concentrating to 25 percent by weight of fiber pulp; (2) adding a silver nitrate and lanthanum nitrate mixed solution for fully mixing and then defiberizing to obtain micro-filament plant fiber slurry;(3) stirring and mixing the fiber pulp and fermentation mother liquor, introducing acetobacter xylinum for aerated culture, adding the micro-filament plant fiber slurry for uniform stirring and performing static culture to obtain bacterial cellulose cross-linked colloidal liquid; (4) in the colloidal liquid, adding a filling agent for uniform stirring, then adding a NaOH solution and after treatment, filtering, cleaning and granulating. The high-efficiency air absorbing material prepared by the preparation method disclosed by the invention realizes super adsorption ability to PM2.5 and otherharmful particles, meanwhile has a sterilizing effect and is natural and environmentally friendly in raw material, and simple and mild in preparation conditions.

The invention relates to a polypyrrole compound-based therapeutic and diagnostic preparation and a preparation method thereof. The prepared polypyrrole preparation has the functions of ultrasound contrast-enhanced diagnosis and photothermal therapy at the same time, and successfully realizes real-time, high-efficiency, low-cost contrast-enhanced ultrasound diagnosis. The combination of high selectivity and high curative effect of near-infrared photothermal therapy greatly increases the efficiency of diagnosis and treatment, and has a good potential for clinical application.

The invention relates to a preparation method of a high-density copper azide with a constrained shell, which belongs to the field of pyrotechnics. Store nanoporous copper or nanoporous copper oxide in a constrained shell, and prepare copper azide with high density through gas-solid in-situ chemical reaction with azide gas before use; avoid during operation Eliminates the dangers of traditional primary explosive production, transportation and post-pressurization. The prepared copper azide in the restrained shell has a high packing density, no danger in the filling process, safe transportation and storage, high detonation power, and a single-shot restrained shell. The dose of copper azide belongs to the sub-milligram level, and the preparation process is green and pollution-free. Adopting the method of the present invention can make packing density 1.4~3.2g / cm 3 High-density copper azide, the prepared high-density copper azide in the confined shell can detonate HNS-IV with a packing density of 75%-92% of the theoretical density and a diameter of ≥0.5mm when the dosage of the high-density copper azide in the confined shell is ≥0.4mg , CL‑20, PETN and RDX and other explosives and ignition of B / KNO 3 Wait for the gunpowder.

The invention discloses a chitose / polyvinyl alcohol composite gel with hydroxyapatite nanometer particle and making method and application, which comprises the following parts: hydroxyapatite nanometer particle, chitose and polyvinyl alcohol, wherein the weight of chitose and polyvinyl alcohol is between 1: 20 and 8: 1 and the weight of hydroxyapatite nanometer particle and chitose is between 0. 5: 1 and 2: 1. The invention provides two making method of the composite gel, including directly adding method and original position generating method. The composite gel can be drug carrier to releasesensitive drug slowly and injecting medical material to repair articular cartilage and organize engineering rack material, which can be applied in the cell culture.

The invention discloses a preparation method for a flame retardant super-hydrophobic melamine sponge. The method comprises the steps that firstly silicon dioxide particles are put into a trismetyl aminomethane buffer solution with a pH value of 7.8, ultrasound treatment is carried out for 20-60 minutes, standing is carried out for 15 minutes at the indoor temperature, and then a gallotannic acid solution and a silver nitrate solution are added in sequence to obtain a mixed solution; a melamine sponge is immersed in the mixed solution, taken out after the mixed solution is stirred for 2 hours at the indoor temperature, and washed by deionized water and ethyl alcohol for several times to obtain a melamine sponge of which the surface has a micro-nano structure; finally, the melamine sponge isput into an ethyl alcohol solution which has volume concentration of 1:500-10000 and contains 1H, 1H, 2H, 2H-perfluorododecane mercaptan, stirring is carried out for 12 hours at the indoor temperature, the melamine sponge is taken out, washed by ethyl alcohol for several times and dried to obtain the super-hydrophobic melamine sponge of which water contact angle is larger than or equal to 145 degrees. The preparation method for the flame retardant super-hydrophobic melamine sponge has the advantages that the preparation process is simple and convenient, the conditions are mild, and the adjustment and control of hydrophobic performance of the super-hydrophobic melamine sponge can be achieved by changing the concentration of a 1H, 1H, 2H, 2H-perfluorododecane mercaptan solution during the preparation.