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Published May 2001 | public
Journal Article

Space-charge effects in nanoparticle processing using the differential mobility analyzer


We report the observation of mobility classification breakdown due to strong space-charge effects during nanoparticle processing in a radial differential mobility analyzer (DMA). A simple dimensionless group, the space-charge number, is introduced to help identify the conditions for which this phenomenon becomes important. Our analysis suggests a few DMA design features and operation conditions that should enable the accurate classification of ultrafine aerosols with high concentrations of charged particles.

Additional Information

This work was supported by the US National Science Foundation under Grant NSF-DMR-98-71850. R.P.C. acknowledges support from CNPq, Brası́lia, Brazil. The authors would like to thank Dr. Gang He and Prof. Kerry J. Vahala for valuable discussions.

Additional details

August 21, 2023
October 23, 2023