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Control of Cell Adhesion using Hydrogel Patterning Techniques for Applications in Traction Force Microscopy

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Frictional adhesion: A new angle on gecko attachment.

K Autumn¹, A Dittmore, D Santos

¹Department of Biology, Lewis & Clark College, 0615 SW Palatine Hill Road, Portland, OR 97219, USA. autumn@lclark.edu

The Journal of Experimental Biology

|September 1, 2006

Summary

Gecko adhesion increases with shear force, not peeling like tape. Their unique dry adhesive mechanism relies on a critical angle for detachment, explaining their climbing ability.

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Area of Science:

Biomechanics
Adhesion Science
Zoology

Background:

Geckos utilize dry adhesive pads on their toes for climbing.
Detachment mechanisms include microscale seta angle changes and macroscale toe peeling.
Gecko adhesion while inverted remains unexplained.

Purpose of the Study:

Investigate gecko adhesion mechanisms, specifically the role of shear force.
Test hypotheses regarding critical angle detachment versus tape-like peeling.
Develop a new model for gecko pad attachment.

Main Methods:

Tested adhesion in isolated setal arrays and live gecko toes.
Measured adhesion dependence on shear force and detachment angle.
Compared experimental results with existing adhesive models.

Main Results:

Adhesion was found to be directly dependent on shear force.
Detachment angle was independent of applied force.
The hypothesis of tape-like peeling was rejected.

Conclusions:

Gecko adhesion is governed by a critical angle of release, not macroscale peeling.
A new 'frictional adhesion' model explains gecko attachment and low detachment forces.
This model clarifies how geckos maintain adhesion, even when inverted.