Method of measuring charge distribution of nanosized aerosols

被引:82
作者
Kim, SH
Woo, KS
Liu, BYH
Zachariah, MR [1 ]
机构
[1] Univ Minnesota, Dept Engn Mech, Minneapolis, MN 55455 USA
[2] Univ Minnesota, Dept Chem, Minneapolis, MN 55455 USA
关键词
nanosized aerosols; positive ion; negative ion; electron; tandem differential mobility analyzer; Boltzmann theory; charge population balance equation; diffusion flame;
D O I
10.1016/j.jcis.2004.08.066
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this paper, we present the development of a method to accurately measure the positive and negative charge distribution of nanosized aerosols using a tandem differential mobility analyzer (TDMA) system. From the series of TDMA measurements, the charge fraction of nanosized aerosol particles was obtained as a function of equivalent mobility particle diameter ranging from 50 to 200 nm. The capability of this new approach was implemented by sampling from a laminar diffusion flame which provides a source of highly charged particles due to naturally occurring flame ionization process. The results from the TDMA measurement provide the charge distribution of nanosized aerosols which we found to be in reasonable agreement with Boltzmann equilibrium charge distribution theory and a theory based upon charge population balance equation (PBE) combined with Fuchs theory (N.A. Fuchs, Geofis. Pura Appl. 56 (1963) 185). The theoretically estimated charge distribution of aerosol particles based on the PBE provides insight into the charging processes of nanosized aerosols surrounded by bipolar ions and electrons, and agree well with the TDMA results. (C) 2004 Elsevier Inc. All rights reserved.
引用
收藏
页码:46 / 57
页数:12
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