  In this study, the adhesion-detachment behaviour of a gecko-inspired adhesive
pad was investigated to understand the on/off switching mechanisms of adhesion
in gecko feet. A macroscopic spatula model was fabricated using silicone
rubber, and adhesion tests combining lateral sliding and vertical debonding
were conducted. It was observed that the contact state and the adhesion force
of the pad vary considerably with the direction of lateral sliding prior to
debonding, and that the pad achieves adhesion during debonding even when it
loses contact due to excess lateral sliding. These results explain the
mechanisms behind the on/off switching and stable adhesion of gecko feet, and
suggest the possibility of developing new-generation adhesives capable of
switchable adhesion.
