Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 113, Issue 12, Pages 3615-3621Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp806079d
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Funding
- Institute for Collaborative Biotechnologies (ICB) [DAAD19-03-D-0004]
- National Science Foundation NIRT [0708367]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [0708367] Funding Source: National Science Foundation
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Geckos are super climbers: they can readily and rapidly stick to almost any surface, whether hydrophilic or hydrophobic, rough or smooth, in dry or wet conditions, and detach with equal rapidity within tens of milliseconds. In this paper, we discuss the rapid switching between the strong adhesion/friction (attached) state and zero adhesiort/friction (detached) state, and present a finite element analysis of gecko setae in terms of their adhesion and friction forces. The analysis shows why the asymmetric, naturally curved setae with a directional tilt play a crucial role in the gecko's articulation mechanism, consistent with recent experimental studies of gecko setal arrays. We derive guidelines for designing synthetic versions of gecko adhesive pads, and propose a design for a gecko-inspired adhesive surface consisting of arrays of curved, asymmetric, and directionally oriented microfibrils, attached to a semirigid backing, and suggest a method for its actuation.
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