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Download filepH-Responsive Sponges Fabricated by Ag–S Ligands Possess Smart Double-Transformed Superhydrophilic–Superhydrophobic–Superhydrophilic Wettability for Oil–Water Separation
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posted on 06.10.2017, 00:00 by Jiahong Guo, Jikui Wang, Yihan Gao, Jie Wang, Wenbo Chang, Siyuan Liao, ZiMing Qian, YaXin LiuAdvanced
applications of surfaces with smart wettability offer
great perspectives to design novel materials. pH-responsive smart
sponges with double transformation are fabricated via in situ decoration of Ag nanoparticles through an oxidation–reduction
reaction and followed by modification with a mixed thiol–ethanol
solution containing HS(CH2)11CH3,
HS(CH2)10COOH, and HS(CH2)11OH. The wettability of sponges with optimal thiol proportions can
switch reversibly between superhydrophilicity–superhydrophobicity–superhydrophilicity
under different pH conditions. In addition, the as-prepared sponges
have excellent absorption capacity and high oil–water separation
efficiency (99.1%). This report provides a simple approach to prepare
smart sponges with switchable wettability which can be further applied
to many practical applications, such as marine purification and an
oil–water on–off switch.