Two recipes for repelling hot water

Timothée Mouterde (), Pierre Lecointre, Gaëlle Lehoucq, Antonio Checco, Christophe Clanet and David Quéré ()
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Timothée Mouterde: UMR 7636 du CNRS, ESPCI, PSL Research University
Pierre Lecointre: UMR 7636 du CNRS, ESPCI, PSL Research University
Gaëlle Lehoucq: Thales Research and Technology
Antonio Checco: Light Engineering Lab
Christophe Clanet: UMR 7636 du CNRS, ESPCI, PSL Research University
David Quéré: UMR 7636 du CNRS, ESPCI, PSL Research University

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract Although a hydrophobic microtexture at a solid surface most often reflects rain owing to the presence of entrapped air within the texture, it is much more challenging to repel hot water. As it contacts a colder material, hot water generates condensation within the cavities at the solid surface, which eventually builds bridges between the substrate and the water, and thus destroys repellency. Here we show that both “small” (~100 nm) and “large” (~10 µm) model features do reflect hot drops at any drop temperature and in the whole range of explored impact velocities. Hence, we can define two structural recipes for repelling hot water: drops on nanometric features hardly stick owing to the miniaturization of water bridges, whereas kinetics of condensation in large features is too slow to connect the liquid to the solid at impact.

Date: 2019
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DOI: 10.1038/s41467-019-09456-8

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