Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 117, Issue 25, Pages 13901-13907Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2002924117
Keywords
drop impact; microstructures; superhydrophobic surfaces; contact time
Categories
Funding
- National Science Foundation (NSF) [CBET-1604424]
- US Department of Agriculture [2018-67013-28063]
- DOE Office of Science [DE-AC02-06CH11357]
- NSF [NNCI-1542081]
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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 hypother- mia risk reduction for endothermic animals and spore spreading enhancement for fungi via wave -induced drop fragmentation.
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