UA Scientists to Develop Reusable Gecko-inspired Adhesive

Washington, USA -- Scientists have come up with a gecko-inspired adhesive that can function under conditions where traditional ones adhesives do not, possibly inspiring new applications.

Wall-climbing robots, bioadhesives or other sticky substances can benefit greatly from a recent discovery about the self-cleaning and reuse abilities of a geckos foot hair by a University of Akron graduate student-researcher and his partners.

The sticky yet clean attribute of this discovery is the gecko toe pad and its ability to repeatedly attach and detach to a surface.

Researchers Shihao Hu, a UA mechanical engineering student, and biologist and recent UA graduate Stephanie Lopez-Chueng of Keiser University in Fort Lauderdale, Fla., and their team discovered that the clue to a dynamic self-cleaning mechanism in gecko setae, or microscopic foot hair, is achieved through the hyperextension of their toes.

"The analysis reveals that geckos have tiny sticky hairs on their toes called setaes, and due to the attaching and detaching mechanism caused by the rolling and peeling motion of their toes as they walk, they release the dirt particles leaving their feet clean," Hu said.

"The dynamic hyperextension effect of its natural toe peeling increases the speed of the cleaning to nearly twice as fast as previously perceived," Hu said.

The findings of the study show that a gecko-inspired adhesive can function under conditions where traditional adhesives do not, possibly inspiring new applications in space or water exploration tools or in common items like duct tape or other products that use sticky properties.

"Through biomimicry, a gecko-inspired adhesive can function under conditions where traditional adhesives do not, such as in a vacuum, outer space or under water," Peter Niewiarowski, interim director, said.

"More broadly, a gecko-inspired adhesive would be able to bind materials together very strongly yet also release very easily. Imagine a tape that binds things together securely like duct tape yet can also be removed and reused over and over again like a post-it note," he added.

About University of Akron

The University of Akron is the public research university for Northeast Ohio. The Princeton Review listed UA among the "Best in the Midwest" in its 2011 edition of Best Colleges: Region-by-Region. Nearly 30,000 students are enrolled in UAs 300 associate, bachelors, masters, doctoral and law degree programs and 100 certificate programs at sites in Summit, Wayne, Medina and Holmes counties.