Effect Of Surface Roughness On Adhesion Of
Multi-hair Structure
Author(s)
K. Takahashi
Abstract
Creatures such as geckos have a multi-hair structure on their foot surfaces to
adhere to roof surfaces without any slimy secretion. The effect of the surface
roughness on the adhesion force is analysed theoretically based on contact
mechanics considering observations. The foot hair has some compliance and is
derived to be suitable to grip rough surfaces quantitatively. The surface
roughness decreases the adhesion force, however the compliance recovers it. The
effect of the roughness and the compliance on the adhesion force is analysed
theoretically and discussed quantitatively. We have clarified a mechanism of the
geckos to release surfaces to take a quick step with such adhesive feet. The
analysis gives a lot of significant knowledge to design or mimic the function of
the creatures such as geckos.
Keywords: adhesion, detachment, surface roughness, JKR contact, gecko, grip
and release, attach and detach, manipulation, roof-hanging, wall-climbing.
1 Introduction
The climbing ability of geckos attracts the interest of scientists [1,2]. The geckos
have about a hundred billion setae per square meters on their foot finger surfaces.
Plenty of nano-scaled spatulas at the top of the setae generates adhesion force, so
that they can grip the roof surfaces to hang their weight. The compliant setaspatula
structure is believed to be for the purpose of gripping rough surfaces.
However, the effect of the roughness and the compliance on the adhesion force
has not been expressed clearly.
Micro-fabricated adhesives mimicking the gecko foot hair are reported [3, 4].
They are just like tape, so sometimes they are called \“gecko tape”. We cannot
simulate the gecko’s quick step using these adhesives. There must exist some
Keywords
adhesion, detachment, surface roughness, JKR contact, gecko, gripand release, attach and detach, manipulation, roof-hanging, wall-climbing.
Related Book
Other papers in this volume
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