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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Mouterde T,Lecointre P,Lehoucq G,Checco A,Clanet C,Quéré Ddoi
10.1038/s41467-019-09456-8subject
Has Abstractpub_date
2019-03-29 00:00:00pages
1410issue
1issn
2041-1723pii
10.1038/s41467-019-09456-8journal_volume
10pub_type
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