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Metastable States and Wetting Transition of Submerged Superhydrophobic Structures

Pengyu Lv, Yahui Xue, Yipeng Shi, Hao Lin, and Huiling Duan
Phys. Rev. Lett. 112, 196101 – Published 12 May 2014
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    Abstract

    Superhydrophobicity on structured surfaces is frequently achieved via the maintenance of liquid-air interfaces adjacent to the trapped air pockets. These interfaces, however, are subject to instabilities due to the Cassie-Baxter-to-Wenzel transition and total wetting. The current work examines in situ liquid-air interfaces on a submerged surface patterned with cylindrical micropores using confocal microscopy. Both the pinned Cassie-Baxter and depinned metastable states are directly observed and measured. The metastable state dynamically evolves, leading to a transition to the Wenzel state. This process is extensively quantified under different ambient pressure conditions, and the data are in good agreement with a diffusion-based model prediction. A similarity law along with a characteristic time scale is derived which governs the lifetime of the air pockets and which can be used to predict the longevity of underwater superhydrophobicity.

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    • Received 30 December 2013

    DOI:https://doi.org/10.1103/PhysRevLett.112.196101

    © 2014 American Physical Society

    Authors & Affiliations

    Pengyu Lv1, Yahui Xue1, Yipeng Shi1,2, Hao Lin3,*, and Huiling Duan1,2,†

    • 1State Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, China
    • 2Key Laboratory of High Energy Density Physics Simulation, Center for Applied Physics and Technology, Peking University, Beijing 100871, China
    • 3Mechanical and Aerospace Engineering, Rutgers, The State University of New Jersey, 98 Brett Road, Piscataway, New Jersey 08854, USA

    • *Corresponding author. hlin@jove.rutgers.edu
    • †Corresponding author. hlduan@pku.edu.cn

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    Vol. 112, Iss. 19 — 16 May 2014

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