Geckskin™ is a new super-adhesive based on the mechanics of gecko feet Named one of the top five science breakthroughs of 2012 by CNN Money, Geckskin™ is so powerful that an index-card sized piece can hold 700 pounds on a smooth surface, such as glass, yet can be easily released, and leaves no residue. B) Ventral view of the foot of a tokay gecko, showing seta-bearing scansors. The natural stickiness of gecko's feet has inspired decades-long research efforts to develop advanced adhesives. Gecko feet stick well but are readily released when the animal shifts its weight; and of course, they can stick again and again, unlike most man-made adhesive tapes. The adhesive on gecko toes differs dramatically from that of conventional adhesives. The polypropylene gecko adhesive is directional and shows adhesion in the direction parallel to the surface, and the patch can be easily removed with a force of less than 0.001 Newton. Gecko adhesive structures and methods used to measure setal adhesive function. So, unlike glue or tape, a gecko’s sticky feet attach and detach effortlessly, a trait envied by mechanical engineers. One of the most popular and modern examples of biomimetics are artificial adhesives inspired by gecko feet. This means that the setae of an average adult gecko weighing 70 g (2.5 oz) can support a aweight of 133 kg (293 lb).
Geckos attach and detach their adhesive toes in milliseconds while running with reckless abandon on nearly any surface. A) Ventral view of a tokay gecko (Gekko gecko) climbing a vertical glass surface.
Arrows represent the forces acting on the gecko's feet as it climbs. For years, biologists have been amazed by the power of gecko feet, which allow these five ounce lizards to produce an adhesive force roughly equivalent to carrying nine pounds up a wall without slipping. Researchers have developed a method of making gecko-inspired adhesive materials much more cost-effective than current methods. A group of UC Berkeley researchers led by Professor Ronald Fearing of the Biomimetic Millisystems Lab have been inspired by these fascinating self-cleaning toes. Important progress has been made, and the basic mechanics of how …
(2000), Nature. 4. Figure modified from Autumn et al. Each square millimeter of a gecko's foot has about 14,000 setae. Non-sticky default state . To create their artificial gecko adhesive, the Stanford team started by making silicone microwedges, which imitated gecko hair. For years, biologists have been amazed by the power of gecko feet, which allow these five ounce lizards to produce an adhesive force roughly equivalent to carrying nine pounds up a wall without slipping. Researchers have developed a method of making gecko-inspired adhesive materials much more cost-effective than current methods. Anti-self-matting The polypropylene fibers do not stick to one another, and do not clump even with 100s of loading/unloading cycles. Gecko Feet This post is for those who don't know much about biomimcry or the inventions it has lead to. We all know that geckos can cling to walls and scurry across ceilings with ease, but did you ever wonder how they did this? There's a new animal-themed adhesive material in town. 5. The foot of a Tokay gecko (Gekko gecko) has about 5,000 setae mm-2 (ref. 4) and can produce 10 N of adhesive force with approximately 100 mm 2 of pad area 10 (Fig. The natural clinging ability of geckos has inspired hundreds of studies seeking design principles that could be applied to creating synthetic adhesives with the same performance capabilities as the gecko: adhesives that use no glue, are self-cleaning and reusable, and are insensitive to a wide range of surface chemistries and roughness. Images (A) and (B) by Mark Moffett. Conventional pressure-sensitive adhesives (PSAs) are soft viscoelastic polymers that degrade, foul, self-adhere, and attach accidentally to inappropriate surfaces. The foot of a Tokay gecko (Gekko gecko) has about 5,000 setae mm-2 (ref. We found shear adhesion significantly decreased on surfaces that had amplitudes and wavelengths approaching the lamella length and inter-lamella spacing, losing 95% of shear adhesion over the range tested. Move over, "duck" tape! 4) and can produce 10 N of adhesive force with approximately 100 mm 2 of pad area 10 (Fig. These are very important because these setae allow very small intermolecular forces called Van der Waals forces to provide the adhesion the geckos need. Thus, dirt particles are removed nearly effortlessly from the gecko’s feet.
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