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Suspended penetration wetting state of droplets on microstructured surfaces

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Abstract

When a water droplet on a micropillar-structured hydrophobic surface is submitted to gradually increased pressure, the Cassie-Baxter wetting state transforms into the Wenzel wetting state once the pressure exceeds a critical value. It has been assumed that the reverse transition (Wenzel-to-Cassie-Baxter wetting state) cannot happen spontaneously after the pressure has been removed. In this paper, we report a new wetting-state transition. When external pressure is exerted on a droplet in the Cassie-Baxter wetting state on textured surfaces with high micropillars to trigger the breakdown of this wetting state, the droplet penetrates the micropillars but does not touch the base of the surface to trigger the occurrence of the Wenzel wetting state. We have named this state the suspended penetration wetting state. Spontaneous recovery from the suspended penetration wetting state to the initial Cassie-Baxter wetting state is achieved when the pressure is removed. Based on the experimental results, we built models to establish the penetration depth that the suspended penetration wetting state could achieve and to understand the energy barrier that influences the equilibrium position of the liquid surface. These results deepen our understanding of wetting states on rough surfaces subjected to external disturbances and shed new light on the design of superhydrophobic materials with a robust wetting stability.

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Authors and Affiliations

  1. Department of Engineering Mechanics and Center for Nano and Micro Mechanics, Tsinghua University, Beijing, 100084, China

    Jing Lou, SongLin Shi, Chen Ma, CunJing Lv & QuanShui Zheng

  2. State Key Laboratory of Tribology, Tsinghua University, Beijing, 100084, China

    QuanShui Zheng

Authors
  1. Jing Lou
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  2. SongLin Shi
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  3. Chen Ma
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  4. CunJing Lv
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  5. QuanShui Zheng
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Corresponding authors

Correspondence to CunJing Lv or QuanShui Zheng.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11632009, and 11872227).

The supporting information is available online at phys.scichina.com and http://link.springer.com/journal/11433. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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Lou, J., Shi, S., Ma, C. et al. Suspended penetration wetting state of droplets on microstructured surfaces. Sci. China Phys. Mech. Astron. 64, 244711 (2021). https://doi.org/10.1007/s11433-020-1654-4

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  • DOI: https://doi.org/10.1007/s11433-020-1654-4

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