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Droplet attraction and coalescence mechanism on textured oil-impregnated surfaces

Author

Listed:
  • Haobo Xu

    (University of Michigan)

  • Yimin Zhou

    (University of Michigan)

  • Dan Daniel

    (King Abdullah University of Science and Technology (KAUST))

  • Joshua Herzog

    (University of Michigan)

  • Xiaoguang Wang

    (The Ohio State University
    The Ohio State University)

  • Volker Sick

    (University of Michigan)

  • Solomon Adera

    (University of Michigan)

Abstract

Droplets residing on textured oil-impregnated surfaces form a wetting ridge due to the imbalance of interfacial forces at the contact line, leading to a wealth of phenomena not seen on traditional lotus-leaf-inspired non-wetting surfaces. Here, we show that the wetting ridge leads to long-range attraction between millimeter-sized droplets, which coalesce in three distinct stages: droplet attraction, lubricant draining, and droplet merging. Our experiments and model show that the magnitude of the velocity and acceleration at which droplets approach each other horizontally is the same as the vertical oil rise velocity and acceleration in the wetting ridge. Moreover, the droplet coalescence mechanism can be modeled using the classical mass-spring system. The insights gained from this work will inform future fundamental studies on remote droplet interaction on textured oil-impregnated surfaces for optimizing water harvesting and condensation heat transfer.

Suggested Citation

  • Haobo Xu & Yimin Zhou & Dan Daniel & Joshua Herzog & Xiaoguang Wang & Volker Sick & Solomon Adera, 2023. "Droplet attraction and coalescence mechanism on textured oil-impregnated surfaces," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-40279-w
    DOI: 10.1038/s41467-023-40279-w
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    References listed on IDEAS

    as
    1. Jianqiang Zhang & Xuejiao Wang & Zhaoyue Wang & Shangfa Pan & Bo Yi & Liqing Ai & Jun Gao & Frieder Mugele & Xi Yao, 2021. "Wetting ridge assisted programmed magnetic actuation of droplets on ferrofluid-infused surface," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    2. Xuefeng Gao & Lei Jiang, 2004. "Water-repellent legs of water striders," Nature, Nature, vol. 432(7013), pages 36-36, November.
    3. Tak-Sing Wong & Sung Hoon Kang & Sindy K. Y. Tang & Elizabeth J. Smythe & Benjamin D. Hatton & Alison Grinthal & Joanna Aizenberg, 2011. "Bioinspired self-repairing slippery surfaces with pressure-stable omniphobicity," Nature, Nature, vol. 477(7365), pages 443-447, September.
    4. David L. Hu & Brian Chan & John W. M. Bush, 2003. "The hydrodynamics of water strider locomotion," Nature, Nature, vol. 424(6949), pages 663-666, August.
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