title: Mechanics of load-drag-unload contact cleaning of gecko-inspired fibrillar adhesives.
abstract: Contact self-cleaning of gecko-inspired synthetic adhesives with mushroom-shaped tips has been demonstrated recently using load-drag-unload cleaning procedures similar to that of the natural animal. However, the underlying mechanics of contact cleaning has yet to be fully understood. In this work, we present a detailed experiment of contact self-cleaning that shows that rolling is the dominant mechanism of cleaning for spherical microparticle contaminants, during the load-drag-unload procedure. We also study the effect of dragging rate and normal load on the particle rolling friction. A model of spherical particle rolling on an elastomer fibrillar adhesive interface is developed and agrees well with the experimental results. This study takes us closer to determining design parameters for achieving self-cleaning fibrillar adhesives.
authors.affiliation: Department of Mechanical Engineering, Carnegie Mellon University , 5000 Forbes Avenue, Pittsburgh, Pennsylvania 15213, United States.
authors.forename: Uyiosa A
authors.initials: UA
authors.lastname: Abusomwan
authors.forename: Metin
authors.initials: M
authors.lastname: Sitti
mesh_terms: D000269:Adhesives / Q000737:chemistry*; D000818:Animals; D001696:Biomechanical Phenomena; D040761:Biomimetic Materials / Q000737:chemistry*; D004548:Elasticity; D017276:Friction; D016014:Linear Models; D008116:Lizards / Q000502:physiology; D009038:Motion
chemical_list: D000269:Adhesives