Advanced Materials

Curvature-Driven Reversible In Situ Switching Between Pinned and Roll-Down Superhydrophobic States for Water Droplet Transportation

Authors

  • Dong Wu,

    1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China
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  • Si-Zhu Wu,

    1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China
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  • Qi-Dai Chen,

    1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China
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  • Yong-Lai Zhang,

    1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China
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  • Jia Yao,

    1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China
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  • Xi Yao,

    1. Center of Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 10190, P. R. China
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  • Li-Gang Niu,

    1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China
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  • Jiang-Nan Wang,

    1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China
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  • Lei Jiang,

    Corresponding author
    1. Center of Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 10190, P. R. China
    • Center of Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 10190, P. R. China.
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  • Hong-Bo Sun

    Corresponding author
    1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China
    2. College of Physics, Jilin University, 119 Jiefang Road, Changchun, 130023, P. R. China
    • State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China
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Abstract

Precise tuning of surface wettability – by means of curvature-driven reversible switching from the pinned to the roll-down superhydrophobic state (see figure) – is reported for for the first time. The adhesion force and sliding behaviors of superhydrophobic poly(dimethylsiloxane) (PDMS) pillar arrays show strong dependence on surface curvature. Alteration of the curvature of the surface allows a water droplet to be easily adjusted from the “ pinned” to the “roll-down” state, which provides the possibility of precise, in situ control of the movements of water droplets.

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