A simple way to achieve tunable adhesion in superhydrophobic nanostructured Co3O4 films

Tunable adhesive forces on the superhydrophobic nanostructured Co3O4 films have been achieved by simply rubbing the as-prepared films. Rubbing makes the change of morphologies of the films and leads to the tuning of adhesion. This morphology-dependent adhesive property is attributed to the difference in kinetic barriers resulting from the contact-state change. This simple and practical method can provide an important strategy for the adhesion adjustment on superhydrophobic surfaces. (C) 2011 Elsevier B.V. All rights reserved.