Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Tandem differential electromobility measuring instrument and its measuring method

A technology of differential electric mobility and measurement method, which is applied in the direction of measuring devices, particle size analysis, scientific instruments, etc., can solve the problems of high price, complex instrument composition, and great difficulty, and achieve simple and easy construction, good stability, and fast The effect of humidification

Active Publication Date: 2013-11-06
TSINGHUA UNIV
View PDF2 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no mature commercial V / H-TDMA system to choose from in the market, only a few commercial H-TDMA, and the price is extremely expensive, so it is generally built by scientific research institutes, but TDMA involves electrical, gas For disciplines such as sol mechanics, fluid mechanics, and spectroscopy, the instrument composition is complex and has high requirements for precision. It is time-consuming and labor-intensive to build completely by yourself, and it is difficult

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Tandem differential electromobility measuring instrument and its measuring method
  • Tandem differential electromobility measuring instrument and its measuring method
  • Tandem differential electromobility measuring instrument and its measuring method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Measuring the Particle Size Distribution of Standard Particles Using DMA1

[0047] Polystyrene standard latex (PSL) is commonly used to produce monodisperse particles of standard particle size. In the instrument built in the present invention, DMA1 is used to measure the particle size distribution of the particles after moisture absorption. In order to characterize the correctness of its measurement, a standard particle of 98nm was produced by using an atomizer and PSL solution. The results of DMA1 measurement are shown in the attached figure 2 . from figure 2 It can be seen that the dispersion degree of the particle size distribution measured by the experiment is small, the peak value of the particle size appears at 99.8nm, the relative error is less than 2%, and the accuracy is high.

Embodiment 2

[0049] Measuring the hygroscopic growth curve of ammonium sulfate

[0050] Ammonium sulfate, the molecular formula is (NH 4 ) 2 SO 4 It is an important component of particulate matter in the atmosphere. Many researchers have done systematic research on its hygroscopic properties, and its hygroscopic curves have been reported and used by many research units. In order to verify the accuracy of measuring the hygroscopicity of the whole system, ammonium sulfate particles are produced by the nebulizer, and the results of measuring the hygroscopicity curve are as follows: image 3shown. During the measurement, ammonium sulfate particles with a particle size of 100nm are screened into the hygroscopic system and DMA1 by adjusting the voltage of SMPS2. The hygroscopic growth factor of ammonium sulfate was measured at different humidity. It can be seen from the measurement results that the hygroscopicity curve of ammonium sulfate measured by the present invention is in good agreeme...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention provides a tandem differential electromobility measuring instrument and its measuring method. According to the invention, monodispersed phase particles with particle size to be measured are screened by SMPS, the screened particles with particle size to be measured enter a perfluorosulfonic acid tube for moisture absorption, particle size distribution of a sample obtained after moisture absorption is measured in DMA, and hygroscopic growth factor is calculated; or the screened particles with particle size to be measured enter a heater to be heated for volatilization, particle size distribution of an aerosol sample obtained after heating for volatilization is measured in DMA, and finally volatility of the particles at different temperatures is calculated. According to the invention, hygroscopic growth factor and volatile proportion of the fine particles in the atmosphere can be rapidly and accurately measured, and the purpose of understanding moisture absorption characteristic and volatility of nanoparticles in various environments can be achieved.

Description

technical field [0001] The invention relates to an analysis instrument and a measuring method thereof, in particular to a serial differential electric mobility measuring instrument and a measuring method thereof. Background technique [0002] With the rapid development of social economy, the population and energy consumption have increased significantly, leading to a large increase in pollutants discharged into the atmosphere, forming a relatively serious air pollution problem. The concentration of fine particles in the atmosphere remains high, seriously affecting the lives of residents and threatening their health. The research on the physical and chemical properties and formation mechanism of atmospheric fine particles has become an important topic of concern in the field of environmental protection. Some inorganic salts (such as sodium chloride, ammonium sulfate, etc.) and some organic components (such as organic acids) in the particulate matter components can show obvio...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N15/02
Inventor 王坤楚碧武李俊华郝吉明蒋靖坤
Owner TSINGHUA UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com