Device for grading particle sizes of nanometer particles on line

Abstract

A device for grading particle sizes of nanometer particles on line comprises a high-voltage power supply device, a neutralization radioactive source, a sampling device, an air intake device, an electrotransport device, a collection head and a filtering device; the design of the air intake device ensures that more stable airflow can be obtained and the influence of diffusion movement of particles can be reduced; and an internal filtering module greatly reduces the volume and the complexity of the device. According to the invention, the principle of electrotransport of particles is adopted, namely, particles having different particle sizes but same quantity of electric charge are different in transport ratio in an electric field; and size grading can be performed to sampled gas real-timely,and the number concentration of particles with different particle sizes can be measured according to the condensation nucleus particle technology. The device provided by the invention is compact and small in structure and strong in applicability, and can supply reliable particle size and number concentration information to the fields of existence and application of various nanometer particles.

Description

technical field [0001] The invention relates to a device for realizing particle size classification of nanoscale particles by using differential electromigration theory, which is applied to various measurement fields where nanoscale particles exist, such as atmosphere and environmental protection. Background technique [0002] The pollution of particulate matter not only has a serious impact on the urban atmospheric environment, such as reduced visibility, but also directly or indirectly affects the global atmospheric environment and human health. Relevant studies have shown that compared with large particles, nano-scale particles with smaller particle sizes Particles can cause more serious harm to the human body. Particle size classification is the primary problem for concentration measurement. [0003] At present, for fine particles with a particle size below 1 μm, there are mainly two particle size measurement techniques: one is to collect aerosol particles used for expe...

AI Technical Summary

Problems solved by technology

At present, the commonly used online measurement devices in China are generally based on the scattered light characteristics of particles for analysis, but because the scattered light of fine particles with a particle size of less than 1 μm is very weak, it is difficult to apply this technology to nano-scale particles with a particle size of less than 1 μm. measuring diameter

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