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System for investigating harmful nano-particle in air

A nanoparticle and air technology, applied in particle suspension analysis, particle and sedimentation analysis, measuring devices, etc., can solve the problems of complex post-processing, non-adjustable needle tip voltage, and inability to distinguish the size of aerosol particles, etc., to achieve the goal of improving sensitivity Effect

Inactive Publication Date: 2009-08-05
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

In recent years, it has also been applied to the detection of atmospheric aerosols. It can quickly and accurately analyze the composition of aerosols, but it cannot distinguish the size of aerosol particles.
In patent WO9728444A1, Turner R et al. used a micron-scale needle tip as an ionization source, which improved the sensitivity of ion mobility spectroscopy. However, the voltage of the needle tip is not adjustable, so all the gases are ionized, and the post-processing is very complicated.

Method used

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  • System for investigating harmful nano-particle in air
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  • System for investigating harmful nano-particle in air

Examples

Experimental program
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Embodiment

[0026] Embodiment: be used to detect the detection of the harmful nanoparticle system in the air, first start the system, set the system parameters, including the ion source voltage and the electrode ring voltage, wherein the electrode ring voltage is a fixed value, but the sign is changed as required, that is, in Negative voltage is used when detecting negative ions, and positive voltage is used when detecting positive ions, and the process of increasing the ionization voltage is divided into five steps, that is, the measured ions are ionized five times according to the level of ionization energy, and the entire system is correspondingly initialized; start detection , the gas to be measured enters the ionization device and is ionized by the ionization source. The ionization source increases step by step from the set low voltage to the high voltage, and the ionized nanoparticle ions enter the separation device; the separation device can separate particle ions of 10nm to 1000nm i...

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Abstract

A system for detecting harmful nanoparticles in the air, the system includes an ionization device, a separation device, and a detection device that are electrically connected to a computer in sequence. The gas to be measured enters from the gas inlet and is ionized by the ionization source when it flows through the ionization device. The diameter of the nanoparticles separated in the separation device is 10nm to 1000nm, and the nanoparticles enter the detection device through the slit outlet. The gas flow enters the filter to be adsorbed, and the gas coming out of the filter passes through the gas pipeline and returns to the inlet of the separation device as a carrier gas for recycling. The detection device detects indirectly based on the measurement of the migration time of different ions. Due to the difference in mobility, different ions arrive at the collection plate one after another. The computer judges the type of nanoparticles to be tested according to the signal of the collection plate. The system can detect the type, concentration and particle size distribution of harmful nanoparticles in the air online.

Description

technical field [0001] The invention relates to the field of nano detection, in particular to a system for detecting harmful nano particles in the air. Background technique [0002] Just as the development of micron technology in the 20th century has brought progress to human beings, nanotechnology is expected to lead to revolutionary changes in human production and lifestyle in the future, so it has become the most invested and fastest-growing scientific research and technological development in developed countries one of the fields. While people are gradually realizing the advantages of nano science and technology and its potential huge market, a new scientific problem and social problem - nano biological effects and safety have recently attracted great attention from the scientific community and governments of various countries. With the wide application of nanomaterials and technologies, people will have many opportunities to come into contact with nanomaterials in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/00G01N15/02G01N15/06G01N27/62G01N27/622
Inventor 刘锦淮孟凡利李民强陈星郭正
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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