Brownian diffusion effect on nanometer aerosol classification in electrical mobility spectrometer

被引:12
作者
Intra, Panich [1 ]
Tippayawong, Nakorn [2 ]
机构
[1] Rajamangala Univ Technol Lanna, Colege Integrated Sci & Technol, Chiang Mai 50300, Thailand
[2] Chiang Mai Univ, Fac Engn, Dept Mech Engn, Chiang Mai 50200, Thailand
关键词
Brownian Diffusion; DMA; Electrical Mobility; Nano-aerosol; SIZE DISTRIBUTION MEASUREMENT; PARTICLES; ANALYZER; DMA; IONS;
D O I
10.1007/s11814-009-0046-5
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A multi-channel differential mobility analyzer (MCDMA) or aerosol spectrometer is widely used for classifying and measuring nanometer aerosol particles in the size range from 1 nm to 1 mu m because of its better time response than a typical differential mobility analyzer. In the present study, the effect of Brownian diffusion on electrical mobility classification and trajectory of nanometer aerosol particles in an electrical mobility spectrometer developed at Chiang Mai University has been analytically investigated. Th Brownian diffusion of particles inside the spectrometer increased with decreasing particle size and flow rates of aerosol and clean sheath air, and with increasing inner electrode voltage, and also decreased with decreasing operating pressure. The particle trajectories considering Brownian diffusion motion inside the spectrometer were found to be broader than those under no Brownian diffusion. Smaller particles were found to have higher degree of broadening of trajectory than the larger particles. Brownian diffusion effect was found to be significant for particles smaller than 10 nm.
引用
收藏
页码:269 / 276
页数:8
相关论文
共 29 条
[1]   Mobility shift in the differential mobility analyzer due to Brownian diffusion and space-charge effects [J].
Alonso, M ;
Kousaka, Y .
JOURNAL OF AEROSOL SCIENCE, 1996, 27 (08) :1201-1225
[2]   Simplified analysis of the effect of Brownian diffusion on the relationship between applied voltage and central mobility in the DMA [J].
Alonso, M ;
Kousaka, Y ;
Hashimoto, T ;
Hashimoto, N .
JOURNAL OF AEROSOL SCIENCE, 1998, 29 (08) :985-994
[3]  
[Anonymous], 11 INT C ATM AER CON
[4]   Description and theoretical analysis of a differential mobility spectrometer [J].
Biskos, G ;
Reavell, K ;
Collings, N .
AEROSOL SCIENCE AND TECHNOLOGY, 2005, 39 (06) :527-541
[5]  
GRASKOW BR, 2001, THESIS U CAMBRIDGE U
[6]   The DMA transfer function with Brownian motion a trajectory/Monte-Carlo approach [J].
Hagwood, C ;
Sivathanu, Y ;
Mulholland, G .
AEROSOL SCIENCE AND TECHNOLOGY, 1999, 30 (01) :40-61
[7]  
Hinds W. C, 1999, AEROSOL TECHNOLOGY
[8]  
Intra P., 2007, CMU J NAT SCI, V6, P313
[9]  
Intra P., 2008, J. Sci. Technol, V30, P243
[10]  
INTRA P, 2006, INT C TECHN INN SUST