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

被引：184

作者：

Bormashenko, Edward ^{[1
]}

Bormashenko, Yelena ^{[1
]}

Stein, Tamir ^{[1
]}

Whyman, Gene ^{[1
]}

Bormashenko, Ester ^{[1
]}

机构：

[1] Coll Judea & Samaria, Res Inst, IL-44837 Ariel, Israel

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2007年 / 311卷 / 01期

关键词：

pigeon feather; barbs; barbules; Cassie-Baxter wetting regime; apparent contact angle; contact angle hysteresis; Cassie-Wenzel wetting transition;

D O I：

10.1016/j.jcis.2007.02.049

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：212 / 216

页数：5

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