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Material Properties Influencing the Charge Decay of Electret Filters and their Impact on Filtration Performance

Electret filters as opposed to mechanical filters display the enhanced ability to capture airborne particles with the electrostatic attraction. However, the environmental aging during shelf-life or use may cancel its benefit by dissipating the charges. This work investigates the polymeric attributes...

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Detalles Bibliográficos
Autores principales: Lee, Jinwook, Kim, Jooyoun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7183080/
https://www.ncbi.nlm.nih.gov/pubmed/32213916
http://dx.doi.org/10.3390/polym12030721
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author Lee, Jinwook
Kim, Jooyoun
author_facet Lee, Jinwook
Kim, Jooyoun
author_sort Lee, Jinwook
collection PubMed
description Electret filters as opposed to mechanical filters display the enhanced ability to capture airborne particles with the electrostatic attraction. However, the environmental aging during shelf-life or use may cancel its benefit by dissipating the charges. This work investigates the polymeric attributes influencing the charge decay and the electrostatic filtration of electret filters, employing polymers with different dielectric constants (ε(r)) and wettability. As accelerated aging, high temperature (120 °C) or high humidity (25 °C, 90% RH) was applied to the electret filters for 48 h. For the humidity aging, wetting property of material was a critical factor affecting the charge decay and the filtration performance, as the absorbed water increases the electrical conductivity. For the thermal aging, the material with the highest ε(r) deteriorated the electric potential and the filtration performance by the largest extent, due to the lower band gap energy for charge transfer. The results of this study implicate that ε(r) and wettability are important material parameters influencing the electric conductivity and chain mobility, and they can be used as convenient predictors for charge retention capacity affecting the robust electrostatic filtration performance.
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spelling pubmed-71830802020-05-01 Material Properties Influencing the Charge Decay of Electret Filters and their Impact on Filtration Performance Lee, Jinwook Kim, Jooyoun Polymers (Basel) Article Electret filters as opposed to mechanical filters display the enhanced ability to capture airborne particles with the electrostatic attraction. However, the environmental aging during shelf-life or use may cancel its benefit by dissipating the charges. This work investigates the polymeric attributes influencing the charge decay and the electrostatic filtration of electret filters, employing polymers with different dielectric constants (ε(r)) and wettability. As accelerated aging, high temperature (120 °C) or high humidity (25 °C, 90% RH) was applied to the electret filters for 48 h. For the humidity aging, wetting property of material was a critical factor affecting the charge decay and the filtration performance, as the absorbed water increases the electrical conductivity. For the thermal aging, the material with the highest ε(r) deteriorated the electric potential and the filtration performance by the largest extent, due to the lower band gap energy for charge transfer. The results of this study implicate that ε(r) and wettability are important material parameters influencing the electric conductivity and chain mobility, and they can be used as convenient predictors for charge retention capacity affecting the robust electrostatic filtration performance. MDPI 2020-03-24 /pmc/articles/PMC7183080/ /pubmed/32213916 http://dx.doi.org/10.3390/polym12030721 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Lee, Jinwook
Kim, Jooyoun
Material Properties Influencing the Charge Decay of Electret Filters and their Impact on Filtration Performance
title Material Properties Influencing the Charge Decay of Electret Filters and their Impact on Filtration Performance
title_full Material Properties Influencing the Charge Decay of Electret Filters and their Impact on Filtration Performance
title_fullStr Material Properties Influencing the Charge Decay of Electret Filters and their Impact on Filtration Performance
title_full_unstemmed Material Properties Influencing the Charge Decay of Electret Filters and their Impact on Filtration Performance
title_short Material Properties Influencing the Charge Decay of Electret Filters and their Impact on Filtration Performance
title_sort material properties influencing the charge decay of electret filters and their impact on filtration performance
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7183080/
https://www.ncbi.nlm.nih.gov/pubmed/32213916
http://dx.doi.org/10.3390/polym12030721
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