The sticky toes of a gecko inspire new adhesive tape

February 2014: The endless stick-ability of geckos’ feet have inspired researchers to develop a reusable adhesive tape.

A gecko’s feet can stay sticky even on dusty and dirty surfaces, allowing them to scurry up vertical walls and hang from ceilings. This is thanks to millions of tiny hairs on each toe that, through lateral friction contact, maintains a firm grip even on polished glass. Even after repeated contact with dirt and dust their feet still perfectly adhere to smooth surfaces.

“When moving forwards, the gecko‘s toes drag across a part of the surface. As a result of this lateral friction contact, larger dirt particles are removed. Smaller particles deposit among the setae on the sole and in the skinfolds below,” the scientists explain.

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How Sticky Toepads Evolved in Geckos and What That Means for Adhesive Technologies

ScienceDaily (June 28, 2012) — Geckos are known for sticky toes that allow them to climb up walls and even hang upside down on ceilings. A new study shows that geckos have gained and lost these unique adhesive structures multiple times over the course of their long evolutionary history in response to habitat changes.

"Scientists have long thought that adhesive toepads originated just once in geckos, twice at the most," says University of Minnesota postdoctoral researcher Tony Gamble, a coauthor of the study. "To discover that geckos evolved sticky toepads again and again is amazing."

The findings are published in the most recent edition of PLoS ONE. Gamble is a researcher in the College of Biological Sciences' Department of Genetics, Cell Biology and Development. Aaron Bauer, a professor at Villanova University, is the study's senior author. The research is part of a long-standing collaboration on gecko evolution among biologists at the University of Minnesota, Villanova University and the University of Calgary.

Geckos, a type of lizard, are found in tropical and semitropical regions around the world. About 60 percent of the approximately 1,400 gecko species have adhesive toepads. Remaining species lack the pads and are unable to climb smooth surfaces. Geckos with these toepads are able to exploit vertical habitats on rocks and boulders that many other kinds of lizards can't easily get to. This advantage gives them access to food in these environments, such as moths and spiders. Climbing also helps geckos avoid predators.


Continued:  http://www.sciencedaily.com/releases/2012/06/120628131053.htm