Peng Wang, Da-Ren Chen This email address is being protected from spambots. You need JavaScript enabled to view it.

Particle Laboratory, Department of Mechanical and Nuclear Engineering, Virginia Commonwealth University, Richmond, VA 23284, USA

Received: January 7, 2021
Revised: February 24, 2021
Accepted: March 13, 2021

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

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Cite this article:

Wang, P., Chen, D.R. (2021). On the Filtration efficiency of Composite Media Composed of Multiple Layers of Electret Media. Aerosol Air Qual. Res.


  • Particle collection efficiency of multi-layered electret media was measured.
  • The measured efficiency of multi-layered media was less than the calculated one.
  • The reasoning for the reported difference was investigated.
  • It is found the reported difference was due to the charge status of test particles.


The intention of this study is to find out the reasoning for the discrepancy between the measured and calculated filtration efficiencies of composite media composed of multiple layers of base electret media reported in previous studies. Size-fractionated particles in neutral, single-charged, and Boltzmann-stationary-charge-distributed were prepared to measure the filtration efficiency of multi-layered electret media. It was found that the reported discrepancy was attributed to the charge distribution of the test particles. This result further suggests that the charge distribution of the test particles must be taken into consideration for the filtration efficiency prediction of multi-layered electret media.

Keywords: Multi-layered electret media, Composite electret media, Filtration efficiency, Boltzmann stationary charge distribution

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