Insights into the Adhesive Mechanisms of Tree Frogs using Artificial Mimics

被引：173

作者：

Drotlef, Dirk-Michael ^{[1
]}

Stepien, Lukas ^{[1
]}

Kappl, Michael ^{[1
]}

Barnes, W. Jon P. ^{[2
]}

Butt, Hans-Juergen ^{[1
]}

del Campo, Aranzazu ^{[1
]}

机构：

[1] Max Planck Inst Polymer Res, D-55128 Mainz, Germany

[2] Univ Glasgow, Ctr Cell Engn, Glasgow G12 8QQ, Lanark, Scotland

来源：

ADVANCED FUNCTIONAL MATERIALS | 2013年 / 23卷 / 09期

关键词：

bioadhesion; patterned adhesives; tree frogs; bioinspired materials; wet adhesion; ASPECT-RATIO; SURFACES; CONTACT; PADS; MORPHOLOGY; FORCES; MICRO; DRY;

D O I：

10.1002/adfm.201202024

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Elastic, microstructured surfaces (hydrophobic and hydrophilic) mimicking the surface structure of tree-frog toe-pads are fabricated. Their adhesion and friction behaviour in the presence of a liquid layer is evaluated and compared to flat controls. Tree-frog-like patterns are beneficial for wet adhesion only if the liquid does not wet the surface. The situation is different in friction, where the surface structure lead to significantly higher friction forces only if the liquid does wet the surface. Taking into account that tree-frog attachment pads are hydrophilic and that their secretion wets all kind of surfaces, our results indicate that the surface structure in tree-frog toe-pads has been developed for climbing, when shear (friction) forces are involved. These results evidence the benefits and limitations of the surface design (microstructure and hydrophilicity) for adhesion and friction under wet conditions.

引用

页码：1137 / 1146

页数：10

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