Equipment and method for collecting nanoparticles in grading manner

Abstract

The invention discloses equipment for collecting nanoparticles in a grading manner. The equipment comprises an ultrasonic scattering device, a demagnetization device, an automatic airflow control device and a grading collection system, which are sequentially connected with one another through pipelines. The invention further provides a method for collecting the nanoparticles in the grading manner on the basis of the equipment. The method comprises the following steps that: the prepared nanoparticles are introduced into the ultrasonic scattering device to be subjected to ultrasonic scattering, then enter the demagnetization device to be subjected to demagnetization, and finally enter the grading collection system to be collected after being treated by the automatic airflow control device, thus obtaining the nanoparticles with different particle diameters. The equipment and the method provided by the invention can effectively solve the technical problem that grading collection of the nanoparticles cannot be performed well because of aggregation of the nanoparticles.

Description

technical field [0001] The invention relates to a device and a method for classifying and collecting nanoparticles. Background technique [0002] Due to the influence of the six basic physical effects of nanoparticles, nanomaterials exhibit special properties in terms of electricity, magnetism, light, catalysis, adsorption and chemical reactivity. Therefore, it can be widely used in powder metallurgy, mechanical parts manufacturing, anti-friction materials, magnetic fluids, lubricants and product development. Therefore, nanomaterials have become the focus of research and attention in the world due to their unique properties such as electricity, magnetism, heat, force, and light, and the mass production of high-quality nanopowders is a hot spot, a key point, and a difficult point. At present, the methods for preparing nano-powders of materials such as metals and alloys generally include physical methods and chemical methods. Physical methods such as mechanical alloying, sput...

AI Technical Summary

Problems solved by technology

The above-mentioned physical method has low productivity, small output, low product purity, uneven particle size distribution, and a single variety of metal nanometers, and it is impossible to produce composite metal nanopowder materials with multiple components in proportion at any time according to needs.

Chemical methods such as: electrolysis method, microemulsion method, chemical plating reduction method, carbonyl thermal decomposition method, etc. The disadvantages of chemical methods are low output, complicated process control, difficult mass production, and certain pollution, etc.

[0003]The patent literature of CN1943924A discloses a method for preparing nanoparticles by lightning gasification of metal wires. The continuous preparation of particles, at the same time, by using different protective gases to obtain nanoparticles with high purity, solves the problems of low yield, small output, low product purity, and uneven particle size when prepared by traditional methods

[0007] (2) Due to the large specific surface area of ​​nanoparticles, when in contact with air or other media, they are easy to absorb or interact with media such as gases, resulting in adhesion and agglomeration;

[0008] (3) Due to its high surface energy and large contact interface, when the nanoparticles are exposed without modification, the growth rate of the grains is accelerated, so the particles Difficult to stay the same size

Therefore, only agglomerated and single nanoparticles can be collected during collection, and nanoparticles of different particle sizes cannot be collected in grades, resulting in single nanoparticles with low quality

At present, in the nanoparticle preparation process, there is only theoretical classification and collection by airflow, but the actual effect is not good or effective classification cannot be achieved at all.

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