Bio-inspired Nanosucker Structures for Dry Adhesives

摘要

We present a facile lithographic nanosucker production process of laminating a nanosphere monolayer with a UV resin and applying various gentle solvent treatments to produce "bottom-up" and "bottom-down" non-close-packed patterns, generating nanosuckers for adhesion. Through mimicking sucker structures on octopus tentacles, we developed a dry adhesive with 6 × 10~8 nanosuckers per cm~2 via an accessible process. The dry adhesive was produced without complex photolithographic processes and with no sticky wet coatings on it. We produced a biomimetic dry adhesive via UV imprinting, and then applied a slight normal weight on the top of the dry adhesive to generate high average shear force (about 50 N/cm~2) and normal pull-off force (about 54 N/cm~2), which as far as we know is the world record among commercial dry adhesives. In addition, the adhesive can be easily peeled off and repeatedly used without any adhesive residue, and maintain its adhesion force in rigorous environment changes, in temperatures up to 200 °C or after washing in a strong acid/base aqueous solution.