Antimicrobial agent treatment is needed to prevent airborne infections due to microorganisms causing diseases. Silver nanowires (AgNW) have been increasingly used in air filters for their superior antimicrobial performance. In this study, AgNWs (115 nm in diameter, 4–50 µm in length) were electrosprayed on the surface of polyacrylonitrile (PAN) fibres that were obtained by electrospinning. Filtration efficiency of the AgNW-coated fibres was tested by aerosolizing and convectively delivering test bacteria and virus particles to the fibres. Then the particles filtered on the fibres were cultured to evaluate antibacterial and antiviral abilities. The overall filtration efficiency of the fibres increased from 92% to 96.5% (at 2.5 cm/s of air velocity) to 98.3–99.6% after AgNW coating for 30 min (areal density = 2.352 μg per 1 cm2 of filter surface area), without affecting the pressure drop. The AgNW coating for 30 min significantly increased the antimicrobial efficiency to 98.0 ± 1.1% for Staphylococcus aureus (S. aureus), 95.2 ± 2.6% for Bacillus cereus (B. cereus), 93.7 ± 1.5% for Micrococcus luteus (M. luteus), and 72.5 ± 1.9% for bacteriophage MS2.
Bibliographical noteFunding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and future Planning ( NRF-2018R1A2A1A05020683 ).
© 2021 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Environmental Engineering
- Environmental Chemistry
- Waste Management and Disposal
- Health, Toxicology and Mutagenesis