Cover Image, Volume 50, Issue 12


original image

Inspired by the superior material properties of β-keratin along with the hierarchical structure of a gecko foot pad, high aspect-ratio Teflon nanopillars terminated with a “fluffy” top layer are fabricated by replica-molding with a nanoporous anodic aluminum oxide membrane as the mold, as presented by Hadi Izadi, Boxin Zhao, Yougun Han, Neil McManus, and Alexander Penlidis on page 846. The rigidity and exceptionally low surface energy of Teflon along with the presence of the top “fluffy” nanostructure itself effectively hinder the self-sticking of high aspect-ratio, high density nanopillars. This type of hierarchical nanopillar is shown to be an efficient dry adhesive that can generate strong adhesion both in air and under water.