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Dry Aerosol Coating of Anti-viral Particles on Commercial Air Filters Using a High-volume Flow Atomizer

Category: Control Techniques and Strategy

Volume: 19 | Issue: 7 | Pages: 1636-1644
DOI: 10.4209/aaqr.2019.04.0212
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Dae Hoon Park1, Yun Haeng Joe2, Jungho Hwang 1

  • 1 School of Mechanical Engineering, Yonsei University, Seoul 03722, Koreav
  • 2 Climate Change Research Division, Korea Institute of Energy Research, Daejeon 34129, Korea

Highlights

  • High-volume flow atomizer (over 200 L min–1) was designed and fabricated.
  • The atomizer had 8.5 times higher particle generation rate than TSI 9302 atomizer.
  • Commercial air filter unit was coated with SiO2-Ag NPs by dry aerosol-coating method.
  • Performance evaluation of the fabricated anti-viral filter was carried out.

Abstract

Filtration is a common air cleaning technique used to remove airborne particulates. However, microorganisms can survive and multiply on the filter’s surface in heating, ventilation, and air-conditioning systems. These multiplied microorganisms eventually disperse in the air. The most conventional method of coating pristine air filter media with anti-viral material involves applying a wet coating via solution processing, wherein the filter media needs to be soaked in a solution containing a large amount of dispersed anti-viral material, and then drying the coated filter using a heated air flow. However, the latter step requires additional time and energy and often causes the deformation of the filter material. By contrast, applying an aerosolized coating is a dry process, wherein aerosolized anti-viral material is directly deposited on the filter at atmospheric pressure and room temperature. In this work, we design a laboratory-made atomizer to generate highly concentrated aerosolized particles at a high flow rate (> 200 L min–1). The generated anti-viral material (SiO2-Ag nanoparticles), which includes liquid droplets, is dried by a sheath air flow and directly applied to a commercial air filter unit. The coated anti-viral filter is evaluated for filtration efficiency and anti-viral activity against aerosolized MS2 bacteriophage.

Keywords

High-volume flow atomizer Air filter Anti-viral Dry aerosol coating


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