Tunability, Switchability, Control of Adhesion

Use of wrinkled surfaces of oxidized PDMS to create mechanically tunable adhesion:

“Mechanically Tunable Dry Adhesive from Wrinkled Elastomers,” Pei-Chun Lin, Shilpi Vajpayee, Anand Jagota, Chung-Yuen Hui, and Shu Yang, Soft Matter, 2008, 4, 1830-1835.

 

Our film-terminated structure can exist in two metastable states. The uncollapsed state has strongly enhanced adhesion because of a crack-trapping mechanism whereas the collapsed state, resembling a rough surface, has very low adhesion. The structure can be repeatedly switched between the two states, allowing active control of adhesion and friction.

Nadermann et al. (Langmuir 2010).