TY - JOUR
T1 - Why do pigeon feathers repel water? Hydrophobicity of pennae, Cassie-Baxter wetting hypothesis and Cassie-Wenzel capillarity-induced wetting transition
AU - Bormashenko, Edward
AU - Bormashenko, Yelena
AU - Stein, Tamir
AU - Whyman, Gene
AU - Bormashenko, Ester
N1 - Funding Information:
The work was supported by the Israel Ministry of Absorption. The authors are grateful to Professor Zinigrad for his continuous support of their research activity. The authors are thankful to Mrs. Albina Musin for her help in the manuscript preparing.
PY - 2007/7/1
Y1 - 2007/7/1
N2 - 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.
AB - 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.
KW - Apparent contact angle
KW - Barbs
KW - Barbules
KW - Cassie-Baxter wetting regime
KW - Cassie-Wenzel wetting transition
KW - Contact angle hysteresis
KW - Pigeon feather
UR - http://www.scopus.com/inward/record.url?scp=34247481269&partnerID=8YFLogxK
U2 - 10.1016/j.jcis.2007.02.049
DO - 10.1016/j.jcis.2007.02.049
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C2 - 17359990
AN - SCOPUS:34247481269
SN - 0021-9797
VL - 311
SP - 212
EP - 216
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
IS - 1
ER -