Contact
    Start Publications Substantial Improvement of Oil Aerosol Filtration Performance ...
    ←  Publication Finder
    Attension

    Substantial Improvement of Oil Aerosol Filtration Performance Using In-Plane Asymmetric Wettability

    Year: 2020

    Journal: ACS Appl. Mater. Interfaces, Volume 12, JUN 24, page 28852–28860

    Authors: Wei, Xin; Liu, Yufeng; Zhou, Hua; Chen, Feng; Wang, Hongxia; Ji, Zhongli; Chase, George G.; Lin, Tong

    Organizations: Australian Research CouncilAustralian Research Council [ARC DP190100306]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [51474229]

    Keywords: functional coatings; surface modification; fibers; patterning; porous materials

    Oil aerosol usually causes air pollution, health issues, and corrosion to equipment. The removal of aerosol oil particles from the air is a crucial process in industrial production and daily life. Although fibrous filters have been a widely used material for the separation of oil aerosol from the air, it is still a challenge to separate submicrometer aerosol oil particles with both high filtration efficiency and low resistance. Herein, we report a novel approach to markedly reduce the pressure drop of a fibrous filter and simultaneously increase its aerosol filtration efficiency, only by surface treatment to make the filter have in-plane alternating superoleophilic and superoleophobic patterns. We used a spraying method to prepare superoleophobic and superoleophilic patterns on the filter. The best filtration results were achieved when two layers of the patterned filters that have superoleophobic and superoleophilic strips (both width, 5 mm) were stacked in a way that the opposite wetting surfaces contacted each other between the layers. The filter showed a much-reduced filtration resistance and the pressure drop (4.16 kPa) at the pseudo-steady state being at least 45% lower when compared to the two-layer controls with a homogeneous surface wettability (i.e., untreated surface, superoleophobicity, and superoleophilicity). It also showed higher filtration efficiency (98.37% for small oil mists and 99.99% for large oil mists) and over two times higher quality factor (0.99 kPa(-1) for small oil mists and 2.27 kPa(-1) for large oil mists). The asymmetric wettability leads to the formation of unobstructed channels for the air stream to penetrate through the filter matrix, leading to a low resistance with improved oil capture efficiency. The pattern strip width showed an effect on filtration performance. This unexpected finding may provide a novel approach to designing high-performance, low energy consumption, and long-life coalescence filters.
    View publication