期刊
ADVANCED OPTICAL MATERIALS
卷 5, 期 22, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201700442
关键词
dynamic manipulation; hydrogels; interband excitation; photothermal actuators; surface plasmon resonance
资金
- National Natural Science Foundation of China
- National key research and development program [61435005, 61590930, 51335008, 51373064, 2017YFB1104300]
Hydrogel actuators represent a powerful tool due to their ability to capture, move, and be manipulated, which has applications in diverse fields. The development of hydrogel actuators capable of localized movement, where only a part of the whole system moves, wireless remote control, and flexible shape-changing is critical and challenging to fulfill their potential. Here, photothermal hydrogel actuators are designed and fabricated to accomplish a precise hand-like manipulation of encapsulating and finger-like one-by-one bending by light. A thermoresponsive poly(N-isopropylacrylamide) (PNIPAm) active layer and a non-thermoresponsive poly(acrylamide) passive layer are combined to generate a thermal-expansion coefficient mismatch among the interface and this energy eventually transforms into a bending motion. As an energy transformation agent, the gold nanoparticles doped in the PNIPAm hydrogel absorb the light energy and transform it into thermalenergy effectively as a result of a surface plasmon resonance electron-phonon process and intrinsic interband transitions. The resulting nanocomposite actuators exhibit flexible, reversible motions and local hand-like finger flexion driven by either flood illumination or local irradiation. The developed programmable actuators are expected to be an attractive candidate for the next generation of smart soft robots.
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