Why do pigeon feathers repel water? Hydrophobicity of pennae, Cassie-Baxter wetting hypothesis and Cassie-Wenzel capillarity-induced wetting transition

Edward Bormashenko; Yelena Bormashenko; Tamir Stein; Gene Whyman; Ester Bormashenko

doi:10.1016/j.jcis.2007.02.049

Why do pigeon feathers repel water? Hydrophobicity of pennae, Cassie-Baxter wetting hypothesis and Cassie-Wenzel capillarity-induced wetting transition

Edward Bormashenko
, Yelena Bormashenko
, Tamir Stein
, Gene Whyman
, Ester Bormashenko

Research output: Contribution to journal › Article › peer-review

231 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	212-216
Number of pages	5
Journal	Journal of Colloid and Interface Science
Volume	311
Issue number	1
DOIs	https://doi.org/10.1016/j.jcis.2007.02.049
State	Published - 1 Jul 2007

Keywords

Apparent contact angle
Barbs
Barbules
Cassie-Baxter wetting regime
Cassie-Wenzel wetting transition
Contact angle hysteresis
Pigeon feather

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10.1016/j.jcis.2007.02.049

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title = "Why do pigeon feathers repel water? Hydrophobicity of pennae, Cassie-Baxter wetting hypothesis and Cassie-Wenzel capillarity-induced wetting transition",

abstract = "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.",

keywords = "Apparent contact angle, Barbs, Barbules, Cassie-Baxter wetting regime, Cassie-Wenzel wetting transition, Contact angle hysteresis, Pigeon feather",

author = "Edward Bormashenko and Yelena Bormashenko and Tamir Stein and Gene Whyman and Ester Bormashenko",

note = "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.",

year = "2007",

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doi = "10.1016/j.jcis.2007.02.049",

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Why do pigeon feathers repel water? Hydrophobicity of pennae, Cassie-Baxter wetting hypothesis and Cassie-Wenzel capillarity-induced wetting transition. / Bormashenko, Edward; Bormashenko, Yelena; Stein, Tamir et al.
In: Journal of Colloid and Interface Science, Vol. 311, No. 1, 01.07.2007, p. 212-216.

Research output: Contribution to journal › Article › peer-review

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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.

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KW - Barbules

KW - Cassie-Baxter wetting regime

KW - Cassie-Wenzel wetting transition

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Why do pigeon feathers repel water? Hydrophobicity of pennae, Cassie-Baxter wetting hypothesis and Cassie-Wenzel capillarity-induced wetting transition

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Keywords

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