Fabrication andAdhesive ForceAnalysis of Biomimetic GeckoFoot-Hair Array

aratio structures I. INTRODUCTION Gekkogecko's foothasabout 5,000 keratinous setae per mm2andcanproduce ION/cm2 adhesive force. Eachseta is30130ptm inlength, 5ptmindiameter andcontains hundreds of 200-500nm spatulae. Theaverage force andstress ofaseta is 20jaN andION/cm2, respectively. Autumn's[1] studies show that thestrong adhesive force between gecko's foot andcontact surface ismainly duetovanderWaalsforces anditisphysical dryadhesion. Theforce ismainly depended onthephysical properties andgeometry sizeofthesetae, notthechemical properties. Thussynthetic dryadhesive canbeobtained through mimicing thestructure ofthesetae.