Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 311, Issue 1, Pages 212-216Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2007.02.049
Keywords
pigeon feather; barbs; barbules; Cassie-Baxter wetting regime; apparent contact angle; contact angle hysteresis; Cassie-Wenzel wetting transition
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Wetting of pigeon feathers has been studied. It was demonstrated that the Cassie-Baxter wetting regime is inherent for pigeon pennae. The water drop, supported by network formed by barbs and barbules, sits partially on air pockets. Small static apparent angle hysteresis justifies the Cassie-Baxter wetting hypothesis. A twofold structure of a feather favors large contact angles and provides its water repellency. Cassie-Wenzel transition has been observed under drop evaporation, when drop radius becomes small enough for capillarity-induced water penetration into the protrusions, formed by barbules. (C) 2007 Elsevier Inc. All rights reserved.
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