Method and special device for measuring particle spectrum of atmospheric nano-particles

A technology of nano-particles and special devices, applied in measurement devices, material analysis by electromagnetic means, instruments, etc., can solve the problems of low probability of sampling holes and serious thermal diffusion of particles, etc.

Inactive Publication Date: 2010-06-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Such a long time will cause the thermal diffusion of the particles to be very serious, and the probability of reaching the sampling hole

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  • Method and special device for measuring particle spectrum of atmospheric nano-particles
  • Method and special device for measuring particle spectrum of atmospheric nano-particles
  • Method and special device for measuring particle spectrum of atmospheric nano-particles

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Embodiment Construction

[0013] Since the mass of nanoparticles is thousands of times larger than that of gas molecules, the mobility of ions is very low, the concentration is small, and the ionization efficiency is lower than that of gases. Diffusion losses in transfer tubes. The following means are used to reduce the diffusion loss of ions: (a) use a micro-sampling splitter to form a pressure difference before and after the splitter, and the ions enter the migration area to form a small divergent ion beam; (b) shorten the length of the migration tube; (c) Increase the electric field strength in the migration zone. The electric field strength in the migration area cannot be increased infinitely, because exceeding a certain voltage will cause corona discharge and burn the instrument. The upper limit of electric field strength decreases with the decrease of air pressure, so there is an optimum value between air pressure and electric field strength. The relationship between the mobility K of aerosol i...

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Abstract

The invention relates to a method for measuring the particle spectrum of atmospheric nano-particles, which comprises the following steps of: adopting an ion migration tube; performing sample introduction on the atmosphere through micropores; forming divergent small ion beams in a drift region of the ion migration tube; and simultaneously, applying negative pressure to the drift region to realize the aim of measuring the particle spectrum of the atmospheric nano-particles in real time, wherein the pressure is 0.1 to 0.5 time of the atmospheric pressure. The method adopts an ion migration spectrum, and shortens the length of the migration tube, improves the migration field strength and reduces the diffusion loss of charged ions by designing a flow divider for micro sample introduction, so the method realizes the real-time measurement of the particle spectrum of the atmospheric nano-particles.

Description

technical field [0001] The invention belongs to the analysis of atmospheric nanoparticles, and in particular relates to a new method and a special device for measuring the particle spectrum of atmospheric nanoparticles. This method can measure the nanoparticles in the atmosphere in real time and quickly. Laying the groundwork for climate change impacts. Background technique [0002] Aerosol refers to the suspended liquid, solid or solid-liquid mixture particles in the air, which reduces the visibility of the atmosphere, affects the balance of atmospheric radiation, is related to global climate change, and poses a threat to human health [Science, 1997, 278: 827-830; Science, 2000, 288:301-305]. How to measure subnano-sized particles (0.5-5nm) in the atmosphere, as well as their chemical composition, is the key to understanding the mechanism and evolution of new atmospheric particles. [0003] A typical electrical nanoparticle analyzer is a differential mobility analyzer (Di...

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Application Information

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IPC IPC(8): G01N15/00G01N27/64
Inventor 王卫国李海洋董璨杜永斋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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