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Bell-Shaped Superhydrophilic–Superhydrophobic–Superhydrophilic Double Transformation on a pH-Responsive Smart Surface

Authors

  • Mengjiao Cheng,

    1. State Key Laboratory of Chemical Resource Engineering and Key Laboratory of Carbon Fibers and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, P. R. China
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  • Qian Liu,

    1. State Key Laboratory of Chemical Resource Engineering and Key Laboratory of Carbon Fibers and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, P. R. China
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  • Guannan Ju,

    1. State Key Laboratory of Chemical Resource Engineering and Key Laboratory of Carbon Fibers and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, P. R. China
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  • Yajun Zhang,

    1. State Key Laboratory of Chemical Resource Engineering and Key Laboratory of Carbon Fibers and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, P. R. China
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  • Lei Jiang,

    1. Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, School of Chemistry and the Environment, Beihang University (BUAA), Beijing, P. R. China
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  • Feng Shi

    Corresponding author
    1. State Key Laboratory of Chemical Resource Engineering and Key Laboratory of Carbon Fibers and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, P. R. China
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Abstract

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Superhydrophobic to neutral water droplets, superhydrophilic to acidic or basic. This double transition of surface wettability in response to a single stimulus – pH – is demonstrated for the first time. The smart surface is composed of a rough gold surface modified with a self-assembled monolayer (SAM) containing three thiols, HS(CH2)11CH3, HS(CH2)10COOH, and HS(CH2)11NH2. A ternary diagram is generated that describes wettability as a function of the SAM composition and the pH of the surrounding solution.

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