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DOI: https://doi.org/10.4491/eer.2021.523
Effect of surface charge density on electret filters charge degradation by organic solvent exposure
Woo Jin Lee1,2, Han Bin Kim1, Hyeonjin Eom1, Jungho Hwang2, and Myong-Hwa Lee3
1Carbon Neutral Technology R&D Department, Korea Institute of Industrial Technology, Republic of Korea
2Department of Mechanical Engineering, Yonsei University, Republic of Korea
3Department of Environmental Engineering, Kangwon National University, Republic of Korea
Corresponding Author: Jungho Hwang ,Tel: +82-33-250-6351; +82-2-2123-2821, Fax: +82-33-259-5542; +82-2-312-2821, Email: myonghwa@kangwon.ac.kr; hwangjh@yonsei.ac.kr
Myong-Hwa Lee ,Tel: +82-33-250-6351; +82-2-2123-2821, Fax: +82-33-259-5542; +82-2-312-2821, Email: myonghwa@kangwon.ac.kr; hwangjh@yonsei.ac.kr
Received: October 20, 2021;  Accepted: January 6, 2022.
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ABSTRACT
The effect of the surface charge density of an electret filter on its collection efficiency degradation via isopropyl alcohol (IPA) species exposure is discussed in this study. Five electret filters with different electrostatic properties and identical physical properties were prepared and exposed to IPA species. Furthermore, the filtration performance was evaluated. Filters exposed to IPA droplets showed a drastic reduction in the collection efficiency. In addition, the electret filter with a higher surface charge density had a higher tolerance to IPA droplets, that is, the challenged IPA droplet amount that neutralized the electret filter with a high surface charge density (= 5.0 × 10-5 c/m2) was 2.5 times higher than that of an electret filter with a low surface charge density (= 1.9 × 10-5 c/m2). The results of this study revealed that there was a positive relationship between the surface charge density and challenged amount required to neutralize an electret filter.
Keywords: Challenged amount | Charge degradation | Electret filter | Isopropyl alcohol | Surface charge density
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