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Effects of Electric Field Strength on an Antimicrobial Air Filter

Hwang, Gi Byoung and Park, Hyun-Seol and Bae, Gwi-Nam and Jung, Jae Hee (2014) Effects of Electric Field Strength on an Antimicrobial Air Filter. Aerosol and Air Quality Research, 14 (3). pp. 1028-1037. ISSN 1680-8584. doi:10.4209/aaqr.2013.06.0199.

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We investigated the effects of a surrounding electric field (EF) on the performance of antimicrobial air filters coated with natural-product nanoparticles. The filtration efficiency of the control filter increased with increasing EF strength, whereas the filtration efficiency of the antimicrobial filter did not, probably because its original efficiency was already high (> 99%) and non- or relatively weakly charged bacterial aerosols were hardly affected by EF strength. The bacterial deposition profiles through the depth of the antimicrobial filters were evaluated. The bacterial concentration at depths of 0–68 µm was increased by about 30% at an EF of 7.7 kV/cm compared with the concentration at 0 kV/cm. Scanning electron microscopy revealed that at 7.7 kV/cm, but not at 0 kV/cm, the bacteria formed dendrites on the fibers of the filter, and the concentration of bacteria deposited on the fibers at 7.7 kV/cm was two to three times that at 0 kV/cm. In antimicrobial tests, the performance of the antimicrobial filters increased with increasing concentration of antimicrobial nanoparticles, but the effectiveness differed between 0 and 7.7 kV/cm. At an identical nanoparticle concentration, the inactivation efficiency of the antimicrobial filter at 7.7 kV/cm was at most 23% lower than that at 0 kV/cm, because the relative increase in bacterial concentration and dendrite formation in the first layer of the antimicrobial filter at 7.7 kV/cm reduced the surface contact area between the bacteria and the antimicrobial nanoparticles. This study provides valuable information for developing a hybrid air purification system that serves various functions and can be used in an indoor environment.

Item Type:Article
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Additional Information:© 2014 Taiwan Association for Aerosol Research. Received for review, June 17, 2013. Accepted, September 8, 2013. This research was supported by the Converging Research Center Program through the Ministry of Science, ICT and Future Planing, Korea (2013K00386).
Funding AgencyGrant Number
Converging Research Center Program, Ministry of Science, ICT and Future Planing, Korea2013K00386
Subject Keywords:Electric field (EF); Bacteria aerosol; Antimicrobial filter; Deposition profile in filter.
Issue or Number:3
Record Number:CaltechAUTHORS:20140509-075515113
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Official Citation: Effects of Electric Field Strength on an Antimicrobial Air Filter Gi Byoung Hwang, Hyun-Seol Park, Gwi-Nam Bae, Jae Hee Jung Pages 1028-1037
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45623
Deposited By: Ruth Sustaita
Deposited On:09 May 2014 16:00
Last Modified:10 Nov 2021 17:14

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