Classification of monodisperse aerosol particles using an adjustable soft X-ray charger

Powder Technology Volume 135-136 Page 336-344 published_at 2003-10-02
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Title ( eng )
Classification of monodisperse aerosol particles using an adjustable soft X-ray charger
Creator
Han Bangwoo
Choi Mansoo
Source Title
Powder Technology
Volume 135-136
Start Page 336
End Page 344
Abstract
At high concentrations of ambient bipolar ions, charged aerosol particles show a stationary charging state as a function of particle size. When the particle diameter exceeds 0.1 μm, a considerable fraction of multiply charged particles is present, which hinders size classification of particles, when a differential mobility analyzer (DMA) is used. However, at low ion concentrations, particle charging by the ions can be suppressed, and in principle, the production of multiply charged particles can be reduced even when the particle size is larger than 0.1 μm. In this study, a use of a power-adjustable soft X-ray emitter was investigated for the first time as the ionization source of an aerosol charger. The bipolar ion concentration was found to be adjustable between 1010 and 1013 ions/m 3. Through proper control of the bipolar ion concentration in the soft X-ray aerosol charger, multiply charged particles were reduced to less than 50f the singly charged particles, while the singly charged particles remained at a relatively high concentration with most of the particles in size range of 0.1-1.0 μm. Therefore, highly monodisperse aerosol particles in the 0.1-1.0-μm-diameter range could be generated using this technique with a commercialized differential mobility analyzer.
Keywords
Aerosol particle
Bipolar charging
Monodisperse
Photoionization
Soft X-ray
Language
eng
Resource Type journal article
Publisher
Elsevier B.V.
Date of Issued 2003-10-02
Rights
(c) 2003 Elsevier B.V.
Publish Type Author’s Original
Access Rights open access
Source Identifier
[NCID] AA11537496
[ISSN] 0032-5910
[DOI] 10.1016/S0032-5910(03)00167-0
[DOI] http://dx.doi.org/10.1016/S0032-5910(03)00167-0 isVersionOf