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How a raindrop gets shattered on biological surfaces.

ABSTRACT: Many biological surfaces of animals and plants (e.g., bird feathers, insect wings, plant leaves, etc.) are superhydrophobic with rough surfaces at different length scales. Previous studies have focused on a simple drop-bouncing behavior on biological surfaces with low-speed impacts. However, we observed that an impacting drop at high speeds exhibits more complicated dynamics with unexpected shock-like patterns: Hundreds of shock-like waves are formed on the spreading drop, and the drop is then abruptly fragmented along with multiple nucleating holes. Such drop dynamics result in the rapid retraction of the spreading drop and thereby a more than twofold decrease in contact time. Our results may shed light on potential biological advantages of hypothermia risk reduction for endothermic animals and spore spreading enhancement for fungi via wave-induced drop fragmentation.

SUBMITTER: Kim S

PROVIDER: S-EPMC7322030 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature

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How a raindrop gets shattered on biological surfaces.

Kim Seungho S Wu Zixuan Z Esmaili Ehsan E Dombroskie Jason J JJ Jung Sunghwan S

Proceedings of the National Academy of Sciences of the United States of America 20200608 25

Many biological surfaces of animals and plants (e.g., bird feathers, insect wings, plant leaves, etc.) are superhydrophobic with rough surfaces at different length scales. Previous studies have focused on a simple drop-bouncing behavior on biological surfaces with low-speed impacts. However, we observed that an impacting drop at high speeds exhibits more complicated dynamics with unexpected shock-like patterns: Hundreds of shock-like waves are formed on the spreading drop, and the drop is then a ...[more]

PMID: 32513723

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