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New adhesive mimics gecko toe hairs
Date:1/30/2008

ll its feet off at every step."

The microfibers, made of polypropylene, are 20 microns long, or one-fifth the thickness of a sheet of paper, with a diameter of 0.6 microns, or one-hundredth the diameter of a human hair.

The structure is similar to a microfiber array developed by the same group in 2006. That material relied upon friction to work, however, requiring the application of force to make it stick. Changes made to the plastic backing enabled the directional adhesion reported in this new material to work on truly vertical surfaces.

"For a gecko, this seemingly subtle change could mean the difference between life or death," said Fearing. "With friction only, a gecko would fall from a wall or ceiling. With directional adhesion, a gecko can stop itself from falling because the mechanism works without the need for force that is perpendicular to the surface."

The new research is described in a pair of papers published online Jan. 23 in the Journal of the Royal Society Interface. Members of Fearing's UC Berkeley research team are Jongho Lee, a graduate student in mechanical engineering, and Bryan Schubert, a graduate student in electrical engineering and computer sciences. Co-author Carmel Majidi, a former UC Berkeley graduate student in electrical engineering and computer sciences, is now a post-doctoral researcher at Princeton University.

"This is a major milestone in the new field of gecko-inspired adhesives," said Kellar Autumn, associate professor of biology at Lewis & Clark College in Portland, Ore., who is considered one of the nation's leading experts on gecko movement and who was not a co-author on this latest research. "Fearing's adhesive is made from a plastic that is very hard { like real gecko protein { so it is not 'sticky' to the touch. Also, just like what we found in real gecko foot hairs, Fearing's microfiber arrays are sticky only when they slide across a surface. This could be the first real gecko tap
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Contact: Sarah Yang
scyang@berkeley.edu
510-643-7741
University of California - Berkeley
Source:Eurekalert

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