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    Robust Microcapsules with Durable Superhydrophobicity and Superoleophilicity for Efficient Oil-Water Separation

    Year: 2020

    Journal: ACS Appl. Mater. Interfaces, Volume 12, DEC 23, page 57547–57559

    Authors: Luo, Wenjun; Sun, Dawei; Chen, Shusheng; Shanmugam, Logesh; Xiang, Yong; Yang, Jinglei

    Organizations: Hong Kong University of Science and Technology [R9365]; Guangzhou Municipal Science and Technology Bureau [201907010024]; Technological Bureau of Guangzhou Huangpu District [2018GH04]; Zhongshan-HKUST Program [RG066]

    Keywords: microcapsules; superhydrophobicity; superoleophilicty; sol-gel surface treatment; durability; long-term storage stability; oil-water separation

    The poor ultraviolet (UV) resistance and insufficient solvent compatibility are challenges for long-term storage and service of oil-water separation materials in practical applications. Herein, a superhydrophobic/superoleophilic surface with nano- to microscale hierarchical structures was formed spontaneously on robust microcapsules (MCs) via in situ polymerization and a sol-gel surface treatment. The resultant MCs possessed superior UV-resistant and solvent-proof superhydrophobicity. The water contact angles (WCAs) of the MC coating remained above 160 degrees and the sliding angles (SAs) were below 3 degrees after 9 days of UV aging test or 20 days of nonpolar and polar aprotic solvent immersion tests. More interestingly, these MCs can be used to separate the oil phase from its aqueous emulsion effectively, achieving a high and reusable separation efficiency with over 90% oil purity after 10 cycles of filtrations even after 13 days of UV aging. Therefore, these novel MCs will exhibit effective oil-water separation performance, superior chemical stability, outstanding reusability, and long-term storage stability for promising practical applications.
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