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Revisiting the effect of hierarchical structure on the superhydrophobicity

  • Kejun Lin
  • Duyang ZangEmail author
  • Xingguo Geng
  • Zhen Chen
Regular Article
Part of the following topical collections:
  1. Wetting and Drying: Physics and Pattern Formation

Abstract.

We have studied the wetting behaviors of surfaces with a single micro-scale structure and a double micro/nano hierarchical structure, respectively. We have found the delayed wetting phenomenon on the single micro scale surface, which indicates that the wetting state transits from the initial Cassie state to the Cassie impregnating one. Furthermore, the droplet rebound becomes incomplete on the single micro scale surface when the impact velocity exceeds a critical value. On the contrary, complete rebound can still be observed when impacting on the micro/nano hierarchical structure. We proposed that, under static deposition the wetting transition occurs though the contact line depinning mechanism, whereas it occurs via sagging mechanism under a dynamic impact. Our results may be helpful for the understanding of superhydrophobicity and the wetting transition on complex structures.

Graphical abstract

Keywords

Topical Issue: Wetting and Drying: Physics and Pattern Formation 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Kejun Lin
    • 1
  • Duyang Zang
    • 1
    • 2
    Email author
  • Xingguo Geng
    • 1
    • 2
  • Zhen Chen
    • 1
  1. 1.Functional Soft Matter & Materials Group, Key Laboratory of Space Applied Physics and Chemistry of Ministry of Education, School of ScienceNorthwestern Polytechnical UniversityXi’anChina
  2. 2.NPU-UM II joint Lab of Soft Matter, School of ScienceNorthwestern Polytechnical UniversityXi’anChina

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