Volume 13, No. 3, June 2013, Pages 1009-1018 PDF(966 KB)
Correlation between the Antibacterial Ability of Silver Nanoparticle Coated Air Filters and the Dust Loading
Yun Haeng Joe1, Wei Ju2, Jae Hong Park3, Young Hun Yoon4, Jungho Hwang1
1 School of Mechanical Engineering, Yonsei University, Seoul 120-749, Korea
2 Shanghai Office, Doosan Heavy Industries & Construction Co., Shanghai City 200-051, China
3 Department of Occupational and Environmental Health, The University of Iowa, Iowa City, USA
4 Green Technology Development Office, Korea Environmental Industry & Technology Institute, Seoul 122-706, Korea
This study investigated the correlation between the antibacterial ability of silver nanoparticle air filters with the related dust loading. In addition, a decay equation with which the life cycle of the antibacterial air filters could be predicted was developed. Samples of a HEPA (High Efficiency Particulate Air) filter were coated with an antibacterial agent, silver nanoparticles, which were synthesized via an atmospheric spark discharge method and deposited onto the filters using forced convection flow. A specific amount of dust particles was then blown onto each filter sample. Two kinds of bacteria, Escherichia coli (E. coli), representing Gram-negative bacteria, and Staphylococcus epidermidis (S. epidermidis), representing Gram-positive bacteria, were used in order to examine the antibacterial abilities of the filter samples. The results of the disc diffusion method showed that the dust loading adversely affected the antibacterial efficacy. However, the silver nanoparticle mass density on a filter with a certain amount of dust does increase the antibacterial ability to a certain extent. Finally, decay equations for the decline rates of the antibacterial ability against E. coli and S. epidermidis were obtained with a dimensionless pressure drop across the antibacterial filter samples.
Silver nanoparticles; Dust loading; Antibacterial; Spark discharge; Disc diffusion method; Decay correlation.