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Resolution of the radial differential mobility analyzer for ultrafine particles

Zhang, Shou-Hua and Flagan, Richard C. (1996) Resolution of the radial differential mobility analyzer for ultrafine particles. Journal of Aerosol Science, 27 (8). pp. 1179-1200. ISSN 0021-8502. doi:10.1016/0021-8502(96)00036-5.

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The resolution of the radial differential mobility analyzer (radial DMA) for particles in 3–60 nm diameter range is probed through tandem radial DMA measurements employing identical radial DMAs. The observed broadening of the range of transmitted particles with decreasing particle Peclet number was shown to be consistent with Stolzenburg's (1988, Ph.D. Thesis, University of Minnesota) model of diffusion broadening of the transfer function, although the broadening was somewhat greater than predicted. A similar, but smaller, deviation is seen in Stolzenburg's data obtained using a cylindrical DMA. The enhanced broadening is thought to result from flow disturbances within the DMA. Diffusional deposition of particles in the radial DMA for two different sheath flow rates correlated well with Pe^(-2/3), while electrophoretic particle losses in the transition from high voltage at the outlet of the DMA to grounded tubing are shown to be independent of the particle Peclet number. The latter effect is, however, small for the radial DMA. Consistent with observations previously made using cylindrical DMAs, the voltage corresponding to the peak in the number concentration is slightly higher for the second DMA than for the first one. This apparent decrease in mobility correlates with Pe^(−1).

Item Type:Article
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Flagan, Richard C.0000-0001-5690-770X
Additional Information:© 1996 Elsevier. (First received 28 December 1995; and in final form 6 March 1996) The authors wish to thank Dr Mark Stolzenburg for important suggestions regarding the treatment of the diffusional transfer function. This work was supported by the National Science Foundation grant NSF-ATM-9307603, the Office of Naval Research Grant N00014-93-1-0872, and the Environmental Protection Agency Exploratory Environmental Research Center on Airborne Organics (R-819714-01-0).
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Office of Naval Research (ONR)N00014-93-1-0872
Environmental Protection Agency (EPA)R-819714-01-0
Issue or Number:8
Record Number:CaltechAUTHORS:20150805-113734674
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Official Citation:Shou-Hua Zhang, Richard C. Flagan, Resolution of the radial differential mobility analyzer for ultrafine particles, Journal of Aerosol Science, Volume 27, Issue 8, December 1996, Pages 1179-1200, ISSN 0021-8502, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59239
Deposited By: Irina Meininger
Deposited On:06 Aug 2015 20:30
Last Modified:10 Nov 2021 22:17

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