Nano-capillary bridges control the adhesion of ice: Implications for anti-icing via superhydrophobic coatings

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Authors
Nguyen, Ngoc N.
Davani, Sina
Asmatulu, Ramazan
Kappl, Michael
Berger, Rüdiger
Butt, Hans-Jürgen
Issue Date
2022-12-13
Type
Article
Language
en_US
Keywords
Ice adhesion , Capillary attraction , Quasi-liquid layer , Surface premelting , Superhydrophobic coating , Adhesion force
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Abstract

Understanding the ice adhesion mechanism is vital for efficient anti-icing. However, previous studies focused on the adhesion of already sintered ice-solid contacts. Here, we study the adhesion mechanism between preformed ice and solid surfaces. In particular, we investigate the initial stages of ice adhesion. We find that capillary bridges formed by the quasi-liquid layer on the ice surface enhance ice adhesion. The adhesion force showed a maximum around −2 °C. Our model indicates that the nano-scaled curvature of the capillary bridge gives rise to strong adhesion forces in the temperatures between −5 and 0 °C. The capillary bridge expands and consolidates over time, causing an increase of adhesion force. These findings provide new physical insights into the ice adhesion mechanism with strong implications to the development of water-repellent superhydrophobic coatings for efficient anti-icing of solid surfaces.

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Citation
Ngoc N. Nguyen, Sina Davani, Ramazan Asmatulu, Michael Kappl, Rüdiger Berger, and Hans-Jürgen Butt. ACS Applied Nano Materials 2022 5 (12), 19017-19024 DOI: 10.1021/acsanm.2c04879
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American Chemical Society
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ISSN
2574-0970
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