Integrated ultrasonic field-assisted microchannel reactor for supercritical hydrothermal synthesis of nanomaterials

Abstract

The invention discloses an integrated ultrasonic external field-assisted microchannel reactor for supercritical hydrothermal synthesis of nanomaterials, comprising a main body formed by axial docking of a plurality of supercritical microchannel reaction modules; A plurality of micro-reaction channels are arranged along the axial direction, and the micro-reaction channels are connected at the top or bottom end of the main body to form a material flow channel in the form of upper and lower turns. Turn up and down in the circumferential direction. The reactor can determine the number of supercritical microchannel reaction modules according to the reaction time of different types of nanoparticles, and precisely control the reaction time; multiple reaction processes are integrated inside the reactor, and the micro-scale multi-process supercritical hydrothermal synthesis reaction and the ultrasonic generator are coordinated. Under the action, metal and metal oxide nano-powders with small particle size and uniform distribution can be synthesized in a green and efficient manner, and at the same time, particle agglomeration can be effectively prevented and problems such as clogging of reaction channels can be avoided.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to an integrated ultrasonic external 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 size is 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 chemicals, life medicine and other fields have triggered a revolution in their fields. Sexual 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. The reaction efficiency is low, the product p...

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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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