Device for grading particle sizes of nanometer particles on line

A particle size, nano-scale technology, applied in the direction of sorting, can solve the problems of weak scattered light, nano-scale particle size classification measurement, etc., to achieve the effect of reducing negative impact, volume reduction, and easy to carry

Active Publication Date: 2013-07-10
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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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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  • Device for grading particle sizes of nanometer particles on line
  • Device for grading particle sizes of nanometer particles on line
  • Device for grading particle sizes of nanometer particles on line

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Embodiment Construction

[0031] Such as figure 1 As shown, the present invention generally speaking, the gas path is divided into two paths: one path is that the sampling air flow passes through the air pump 1, the flow meter 1 (the monitoring flow is maintained at 1L / min), enters the impact sampler sampling device for particle size cutting, and obtains Small particles with a particle size of less than 1 μm, particles larger than this cutting particle size will remain on the impact plate, and the coarsely classified small particles will enter the neutralization radiation source from the gap between the impact plate and the nozzle along with the airflow, and the neutralization source 241 Am decays and emits α-rays to ionize the air and finally complete the recharging of the particles; at the same time, the other sheath gas flow, the flow meter 2 monitors the flow rate at 10L / min, and the flow enters the sheath gas intake device; The sheath gas stream flows downward to minimize the effect of particle d...

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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...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B07C5/344
Inventor 刘建国吴玉笛路亦怀桂华侨王杰伍德侠戴海婷
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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