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We describe the fabrication of photopatterned actuators, composed of stimuli-responsive hydrogel bilayers made from N-isopropyl-acrylamide (NIPAm), acrylic acid (AAc), and poly-ethylene oxide diacrylate (PEODA). The hydrogels were deposited by spin coating and casting and were patterned by non-contact photolithography. We investigated the swelling behavior of the individual photopatterned hydrogels...
Reversible curving of chromium/copper bilayers on exposure to oxidative and reductive environments is described. Bilayers are lithographically patterned as hinges within larger microstructures to enable reversible opening and closing, without the need for any tethers or batteries (see image). Demonstrations suggest a new strategy for coupling chemical reactions and surface modification to mechanical...
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...
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