33results about How to "Short synthesis path" patented technology

The invention provides a method for preparation of fluorescent silica nanoparticles. The method includes: a), mixing indocyanine type fluorescent dye with an organic silicon source compound to obtain a precursor solution; b), allowing the precursor solution to react under constant temperature to obtain the fluorescent silica nanoparticles. The water-soluble fluorescent silica nanopartricles are prepared with the one-step method which is performed completely in water phase, so that the method is safe in operation, rapid and convenient, low in toxicity and safe and easy in obtaining raw materials; the water-soluble fluorescent silica nanoparticles are quite good in monodispersity, high in fluorescent property and quantum yield, good in stability, good in water solubility, capable of serving as fluorescence indicators widely applied to biological detection and analysis and hopeful to be used for optical related industrial production such as laser and organic light emitting diodes.

The invention provides a cross-linked polyethylene and its preparation method and application, and relates to the technical field of modification and processing of polyethylene. The cross-linking modification and recycling processing of polyethylene are realized through the reversibility and cyclicity of Diels-Alder reaction between furan-modified polyethylene and organic cross-linking agent, hybrid cross-linking agent or inorganic cross-linking agent, respectively. The preparation method of the novel recyclable cross-linked polyethylene of the invention is simple, the raw material is cheap, the physical properties of the cross-linked polyethylene are greatly improved, and the resistance to environmental stress cracking, corrosion resistance, weather resistance, creep resistance and the like are significantly improved. The cross-linked waste can be de-crosslinked through twin-screw melt processing to achieve reverse Diels-Alder reaction to achieve recycling, reducing environmental pollution and resource waste, and endowing it with the performance of recycling while improving the performance of polyethylene.

The invention provides a high-entropy rare earth co-doped nanometer low heat transfer powder material and a preparation method thereof, comprising the following steps: (1) putting rare earth source, boron source and intermediate into a high pressure reaction kettle, and flushing hydrogen , heat up to 320-340 ℃ and fully stir for activation, extract and layer the obtained product, carry out suction filtration washing, drying, then wet grinding, spray granulation of the obtained slurry, and granulate the obtained slurry. The spherical powder is dry-milled to obtain a precursor; (2) the precursor is loaded into a rotary kiln for calcination, a hydrogen-nitrogen mixture is introduced into the rotary kiln, the temperature is raised to 900-1200°C, the temperature is kept for 30-450min, and the temperature is lowered. and (3) removing impurities from the initial product to obtain the high-entropy rare earth co-doped nanometer low heat transfer powder material. The high-entropy rare earth co-doped nanometer low heat transfer powder material of the present invention has small scattered and fluffy particle size, low required temperature and low energy consumption.