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    Facile Functionalization via Plasma-Enhanced Chemical Vapor Deposition for the Effective Filtration of Oily Aerosol

    Year: 2019

    Journal: Polymers, Volume 11, SEP

    Authors: Roh, Sanghyun; Kim, Sungmin; Kim, Jooyoun

    Organizations: Creative-Pioneering Researchers Program through Seoul National University [350-20180050]; National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2018R1D1A1B07040340]

    Keywords: plasma; filtration; loading; surface energy; charges

    With the growing concern about the health impacts associated with airborne particles, there is a pressing need to design an effective filter device. The objective of this study is to investigate the effect of plasma-based surface modifications on static charges of electrospun filter media and their resulting filtration performance. Polystyrene (PS) electrospun web (ES) had inherent static charges of similar to 3.7 kV due to its electric field-driven process, displaying effective filtration performance. When oxygen species were created on the surface by the oxygen plasma process, static charges of electret media decreased, deteriorating the filter performance. When the web surface was fluorinated by the plasma-enhanced chemical vapor deposition (PECVD), the filtration efficiency against oily aerosol significantly increased due to the combined effect of decreased wettability and strong static charges (similar to-3.9 kV). Solid particles on the charged media formed dendrites as particles were attracted to other layers of particles, building up a pressure drop. The PECVD process is suggested as a facile functionalization method for effective filter design, particularly for capturing oily aerosol.
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