Advanced Materials

Cover image for Vol. 28 Issue 46

22_03/2010Chemomechanical Actuators: Reversible Actuation of Microstructures by Surface-Chemical Modification of Thin-Film Bilayers (Adv. Mater. 3/2010)

Microstructures such as grippers and cubic containers reversibly open and close when exposed to chemicals without the need for any wires, tethers, or batteries, as demonstrated by David Gracias and co-workers on p. 407. The cover shows bidirectional microgrippers with selected digits closing and opening spontaneously in response to surface oxidation and reduction of copper films within thin-film bilayer hinges. Image created by Martin Rietveld and Jatinder Randhawa.

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