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Studying the Neural Basis of Adaptive Locomotor Behavior in Insects

Studying the Neural Basis of Adaptive Locomotor Behavior in Insects

Published on: April 13, 2011

Insect tricks: two-phasic foot pad secretion prevents slipping.

Jan-Henning Dirks¹, Christofer J Clemente, Walter Federle

¹Department of Zoology, University of Cambridge, Cambridge, UK.

Journal of the Royal Society, Interface

|September 17, 2009

Summary

Insect adhesive pads use a unique liquid emulsion to prevent slipping. Manipulating this fluid

Area of Science:

Biophysics
Materials Science
Insect Morphology

Background:

Insects utilize specialized adhesive pads for locomotion on various surfaces.
These pads secrete a liquid emulsion, a two-phasic fluid, whose precise function remains largely unelucidated.
The role of the emulsion's watery and oily phases in adhesion and friction is not well understood.

Purpose of the Study:

To investigate the functional role of the two-phasic nature of insect adhesive secretions.
To determine how the emulsion's composition influences friction and adhesion on smooth substrates.
To explore the potential for bio-inspired adhesive technologies.

Main Methods:

Utilized smooth polyimide substrates engineered to selectively absorb the watery component of insect adhesive secretions.

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Performed in vivo manipulation of the adhesive secretion by varying polyimide coating thickness.

Measured friction forces using sliding experiments with stick insect adhesive pads on modified substrates.

Employed artificial polydimethylsiloxane (PDMS) pads as controls to isolate the effect of the insect's adhesive system.

Main Results:

Selective absorption of the watery phase by polyimide substrates significantly reduced friction forces.
Thick polyimide coatings effectively removed hydrophilic droplets, altering the emulsion's properties.
Artificial control pads showed no change in friction, confirming the effect is specific to the insect's emulsion.
Demonstrated that the reduction of the watery component directly impacts the adhesive system's friction.

Conclusions:

Insect adhesive pad secretions function as non-Newtonian emulsions, crucial for preventing slippage.
The two-phasic nature of the emulsion is key to balancing adhesion and friction.
These findings suggest evolutionary optimization of insect adhesives and offer insights for biomimetic materials.