Spontaneous dewetting transitions of droplets during icing & melting cycle

Lizhong Wang, Ze Tian, Guochen Jiang, Xiao Luo, Changhao Chen, Xinyu Hu, Hongjun Zhang and Minlin Zhong ()
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Lizhong Wang: Joint Research Center for Advanced Materials & Anti-icing of Tsinghua University (SMSE)-AVIC SARI, School of Materials Science and Engineering, Tsinghua University
Ze Tian: Joint Research Center for Advanced Materials & Anti-icing of Tsinghua University (SMSE)-AVIC SARI, School of Materials Science and Engineering, Tsinghua University
Guochen Jiang: Joint Research Center for Advanced Materials & Anti-icing of Tsinghua University (SMSE)-AVIC SARI, School of Materials Science and Engineering, Tsinghua University
Xiao Luo: Joint Research Center for Advanced Materials & Anti-icing of Tsinghua University (SMSE)-AVIC SARI, School of Materials Science and Engineering, Tsinghua University
Changhao Chen: Joint Research Center for Advanced Materials & Anti-icing of Tsinghua University (SMSE)-AVIC SARI, School of Materials Science and Engineering, Tsinghua University
Xinyu Hu: Joint Research Center for Advanced Materials & Anti-icing of Tsinghua University (SMSE)-AVIC SARI, School of Materials Science and Engineering, Tsinghua University
Hongjun Zhang: Joint Research Center for Advanced Materials & Anti-icing of Tsinghua University (SMSE)-AVIC SARI, School of Materials Science and Engineering, Tsinghua University
Minlin Zhong: Joint Research Center for Advanced Materials & Anti-icing of Tsinghua University (SMSE)-AVIC SARI, School of Materials Science and Engineering, Tsinghua University

Nature Communications, 2022, vol. 13, issue 1, 1-15

Abstract: Abstract Anti-icing superhydrophobic surfaces have been a key research topic due to their potential application value in aviation, telecommunication, energy, etc. However, superhydrophobicity is easily lost during icing & melting cycles, where the water-repellent Cassie-Baxter state turns to the sticky Wenzel state. The reversible transition during icing & melting cycle without external assistance is challenging but vital for reliable anti-icing superhydrophobic performance, such a topic has rarely been reported. Here we demonstrate a spontaneous Wenzel to Cassie-Baxter dewetting transition during icing & melting cycle on well-designed superhydrophobic surfaces. Bubbles in ice droplets rapidly impact the micro-nano valleys under Marangoni force, prompting the continuous recovery of air pockets during melting processes. We establish models to confirm the bubbles movement broadens the dewetting conditions greatly and present three criteria for the dewetting transitions. This research deepens the understanding of wettability theory and extends the design of anti-icing superhydrophobic surfaces.

Date: 2022
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DOI: 10.1038/s41467-022-28036-x

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