4results about How to "Inhibit ripening" patented technology

The invention belongs to the technical field of chemistry, and particularly relates to a water-based stable transdermal preparation based on a structural nanoemulsion and a preparation method of the water-based stable transdermal preparation. 1% to 10% of a polyether block copolymer; 5%-20% of a co-emulsion; 0.1% to 15% of an active ingredient; and the balance of deionized water. Through a compounding system of an amino acid surfactant and a gemini surfactant and in combination with the synergistic effect of a specific polyether block copolymer, a nanoemulsion drug delivery system with a stable structure is constructed. Through a compound system of the amino acid surfactant and the gemini surfactant and by combining the synergistic effect of the polyether block copolymer, a nano-emulsion drug delivery system with a stable structure is constructed, and the nano-emulsion drug delivery system has good long-term storage stability and temperature adaptability, is not easy to layer and is uniform in particle size distribution.

This invention discloses a method for preparing a Pt / C catalyst by vacuum impregnation with an ionic liquid and its application. First, a carbon support is mixed with water and alcohol, ball-milled, and then mixed with nitric acid to obtain an acid-treated carbon support. Next, a precursor solution is prepared by mixing a platinum salt, an organic solvent, a surfactant, and water, and then an imidazole ionic liquid is added to it in portions to obtain a precursor solution containing the ionic liquid. This solution is mixed with the acid-treated carbon support and vacuum ball-milled to obtain a mixed slurry. This slurry is then vacuum freeze-dried to obtain a freeze-dried powder. Reduction and heat treatment are then performed to obtain the ionic liquid-doped Pt / C catalyst. The catalyst is then coated onto both sides of a proton exchange membrane to form a catalytic layer. Through this method, this invention not only effectively inhibits the aggregation, migration, and ripening of platinum particles during electrochemical processes, thereby significantly improving the catalyst's durability, but also enhances the catalyst's proton conductivity under low humidity conditions.

The invention relates to a hot-rolled wire rod for a 2430 MPa grade stranded wire and a manufacturing method of the hot-rolled wire rod, after Al-Si-V chemical components are rolled and spun into a wire rod, the wire rod is subjected to online molten salt rapid quenching isothermal treatment, so that the wire rod is firstly subjected to front-section molten salt treatment and is rapidly cooled, and enters a sorbite phase region from an austenite state to form a structure taking a sorbite structure as a main structure; and then carrying out rear-section molten salt treatment, reducing the circulation volume of molten salt, promoting the unconverted retained austenite to be continuously converted into sorbite, carrying out isothermal tempering, promoting fusing of a part of sorbite lamellar layers, and finally carrying out slow cooling through a roller way, so as to prepare the hot-rolled wire rod of which the microscopic structure comprises a mixed structure consisting of tempered sorbite, tempered ferrite and fused sorbite, the material cost can be reduced, abnormal structures can be inhibited, the tensile strength is 1581-1630 MPa, the percentage reduction of area is 34%-39%, off-line heat treatment is not needed, and efficient and stable production of the ultra-high-strength stranded wire is promoted.

The application belongs to the technical field of nanometer material preparation, and particularly relates to a single-wall carbon nanometer tube, a preparation device thereof and a preparation method thereof. The device comprises a reaction furnace, a laser generating system, a target material supply system and a control system. The laser generating system adopts a low-cost and long-life optical fiber laser array to form a large-area irradiation area; the target material supply system continuously transports a graphite composite target material doped with a specific binary metal catalyst to the irradiation area through a linear track. Under an inert atmosphere and high temperature, the optical fiber laser array is used to evaporate the composite target material containing hafnium (Hf) and iron-based transition metals, carbon atoms are catalytically induced to self-assemble, and single-wall carbon nanometer tubes are continuously grown. Through the cooperation of the low-cost laser source, the hafnium-based catalyst and the continuous feeding system, the problems of expensive equipment, low yield, difficult tube diameter control and intermittent production of the traditional laser method are solved, and the low-cost, large-batch and continuous preparation of high-quality single-wall carbon nanometer tubes is realized.