Journal of Atmospheric and Environmental Optics, Volume. 15, Issue 6, 438(2020)
Performance Comparison Between a Custom-Made Soft X-Ray Neutralizer and a Commercial Counterpart
Performance comparison between a custom-made soft X-ray neutralizer (CM-SXR) and a commercial counterpart (TSI-SXR, advanced aerosol neutralizer, model 3088, TSI, USA) is made by using a scanning mobility particle sizer (SMPS). The results show that for all the tested particles (i.e., Polystyrene latex particles, ammonium sulfate particles, sodium chloride particles, and room air particles) with a size greater than 20 nm, the particle number concentration measured by CM-SXR is higher than that measured by TSI-SXR when the differential mobility analyzer (DMA) is operated under the negatively-charged particle mode, and the differences can be up to 40%. However, opposite results have been found when the DMA is operated at the positively-charged mode, that is the particle number concentration measured by TSI-SXR is higher than that measured by CM-SXR and the differences are up to 77%. Possible reasons accounting for the above differences are discussed, and it is deduced that the mounting position of the soft X-ray in the two neutralizers, which results in different exposures of the X-ray and the differences of the residence time when the sample passes the two different neutralizers, is likely the main reason leading to different positively-and negatively-charged particle distribution inside the neutralizers.
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LIANG Baoling, XU Hanbing, ZHAO Jun. Performance Comparison Between a Custom-Made Soft X-Ray Neutralizer and a Commercial Counterpart[J]. Journal of Atmospheric and Environmental Optics, 2020, 15(6): 438
Received: Aug. 12, 2020
Accepted: --
Published Online: Apr. 22, 2021
The Author Email: Baoling LIANG (liangbl3@mail2.sysu.edu.cn)