Beetle footpads could inspire novel man-made adhesives

April 6th, 2011 - 3:00 pm ICT by ANI  

Washington, April 6 (ANI): Researchers from the University of Cambridge found that the different forces required to peel away adhesive hairs or ’setae’ from surfaces are what allows beetles to adhere to diverse surfaces, thereby reducing the risk of detachment.

The findings by James Bullock and Walter Federle could inspire novel man-made adhesives.

The study reports the first adhesive force measurements from single microscopic setae in a live animal.

The adhesive hairs on the feet of leaf beetles are known to take three distinct shapes - pointed, flat (spatula-tipped) and disk-like.

They are arranged in specific patterns across the beetle’s feet, indicating different biological functions for each hair type. Given their small size (only 1/200th of a millimeter across), there existed no way to determine their individual properties.

Bullock and Federle therefore devised a method for measuring the in vivo stickiness of each hair using a fine glass cantilever.

By observing the deflection of the cantilever through a microscope, the force needed to detach each hair was calculated.

Results in male beetles showed that the disk-like hairs adhered with the highest force, followed by spatula-tipped and then pointed hairs.

Disk-like hairs were also stiffer than either flat or pointed hairs, likely providing stability to the pad.

Bullock and Federle suggested that it is these disk-like hairs in particular which allow male beetles to achieve strong adhesion on smooth surfaces.

This ability is also important for the males during copulation to hold on firmly to the back of the females. The other hair types, being easier to ‘un-stick’, may help the beetle to rapidly detach its feet when running upside down.

Before these natural structures can be replicated as synthetic adhesives, a better understanding of their detailed function is needed.

“The question of how forces in natural adhesive systems run from the single-hair to the whole-animal level is a central, unresolved problem. Its understanding will be a prerequisite for the design of bio-inspired synthetic adhesives,” the researchers concluded.

The study is published online in the Springer journal Naturwissenschaften - The Nature of Science. (ANI)

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