Integrated ultrasonic external field assisted microchannel reactor for supercritical hydro-thermal synthesis of nanomaterials

Abstract

The invention discloses an integrated ultrasonic external field assisted microchannel reactor for supercritical hydro-thermal synthesis of nanomaterials. The reactor comprises a main body formed by axial butt joint of a plurality of supercritical microchannel reaction modules, wherein the supercritical microchannel reaction modules are provided with a plurality of miniature reaction channels along an axial direction, the miniature reaction channels are connected at the top end or the bottom end of the main body to form a material flow channel in an up-and-down turn-back form, and the up-and-down turn-back form comprises an up-and-down turn-back track in different radial directions and an up-and-down turn-back track in the same radial direction and different circumferential directions. According to the reactor, the number of the supercritical microchannel reaction modules can be determined according to the reaction time of different types of nanoparticles, and reaction time is accurately regulated and controlled; a plurality of reaction processes are integrated in the reactor; under the synergistic effect of a micro-scale multi-process supercritical hydrothermal synthesis reaction and an ultrasonic generator, metal and metal oxide nanopowder with a small particle size and uniform distribution can be synthesized in a green and efficient manner; and meanwhile, particle aggregation is effectively prevented, and the problems of reaction channel blockage and the like are avoided.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to an integrated ultrasonic field-assisted microchannel reactor for supercritical hydrothermal synthesis of nanomaterials. Background technique [0002] Nanomaterials are a high-end product branch in new materials, and their sizes are usually between 1-100nm. Due to the unique electrical, thermal, magnetic, optical and mechanical properties of nanomaterials, their applications in military technology, electronic information, high-end manufacturing, new energy, green chemical industry, life medicine and other fields have triggered revolutions in their fields. technological breakthrough. At present, the technologies for preparing nanomaterials mainly include high-temperature solid-phase method, chemical vapor deposition method, spray pyrolysis method, hydrothermal method, sol-gel method, and co-precipitation method, etc., but these traditional preparation ...

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Problems solved by technology

[0005] In order to overcome the shortcomings of the above-mentioned prior art, realize precise control of the reaction time of different types of nanomaterials, and obtain nanoparticles with small particle size and uniform size distribution, the purpose of the present invention is to provide a method for supercritical hydrothermal synthesis of nanomaterials. Integrated ultrasonic external field-assisted microchannel reactor, which is composed of multiple supercritical microchannel reaction modules, the number of modules can be freely increased or decreased according to the reaction time of different types of nanomaterials, the reaction time can be precisely adjusted, and the cost of the experiment can be saved; internal Integrating multiple microchannel reaction processes, with moderate external dimensions, it is convenient to add heat preservation measures to maintain the temperature required for the reaction; it overcomes the shortcomings of microchannel reactors such as inconvenient heat preservation, easy blockage, and inability to accurately control the reaction time of different types of nanomaterials. Critical hydrothermal synthesis technology can efficiently prepare nanoparticles with small particle size and uniform size distribution

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