期刊
SMART MATERIALS AND STRUCTURES
卷 23, 期 9, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0964-1726/23/9/094008
关键词
origami; robotics; actuators; polymer; self-assembly; microfabrication; lithography
资金
- National Science Foundation [NSF CBET-1066898]
We describe a photolithographic approach to create functional stimuli responsive, self-folding, microscale hydrogel devices using thin, gradient cross-linked hinges and thick, fully cross-linked panels. The hydrogels are composed of poly (N-isopropylacrylamide-co-acrylic acid) (pNIPAM-AAc) with reversible stimuli responsive properties just below physiological temperatures. We show that a variety of three-dimensional structures can be formed and reversibly actuated by temperature or pH. We experimentally characterized the swelling and mechanical properties of pNIPAM-AAc and developed a finite element model to rationalize self-folding and its variation with hinge thickness and swelling ratio. Finally, we highlight applications of this approach in the creation of functional devices such as self-folding polymeric micro-capsules, untethered micro-grippers and thermally steered micro-mirror systems.
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