title: Strong, reversible underwater adhesion via gecko-inspired hydrophobic fibers.
abstract: Strong, reversible underwater adhesion using gecko-inspired surfaces is achievable through the use of a hydrophobic structural material and does not require surface modification or suction cup effects for this adhesion to be effective. Increased surface energy can aid in dry adhesion in an air environment but strongly degrades wet adhesion via reduction of interfacial energy underwater. A direct comparison of structurally identical but chemically different mushroom shaped fibers shows that strong, reversible adhesion, even in a fully wetted, stable state, is feasible underwater if the structural material of the fibers is hydrophobic and the mating surface is not strongly hydrophilic. The exact adhesion strength will be a function of the underwater interfacial energy between surfaces and the specific failure modes of individual fibers. This underwater adhesion has been calculated to be potentially greater than the dry adhesion for specific combinations of hydrophobic surfaces.
authors.affiliation: Department of Mechanical Engineering, University of Alberta , 4-9, Mechanical Engineering Building, Edmonton, Alberta T6G 2G8, Canada.
authors.forename: Babak
authors.initials: B
authors.lastname: Soltannia
authors.forename: Dan
authors.initials: D
authors.lastname: Sameoto
mesh_terms: D000269:Adhesives; D000818:Animals; D057927:Hydrophobic and Hydrophilic Interactions; D008116:Lizards
chemical_list: D000269:Adhesives
keywords: dry adhesion; gecko-inspired; hydrophilic; hydrophobic; underwater