

FOLLOWUS
Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, China
Hui-liang Wang (汪辉亮), E-mail:wanghl@bnu.edu.cn
Received:13 April 2017,
Revised:2017-5-2,
Accepted:04 May 2017,
Published:05 October 2017
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Xin Peng, Tian-qi Liu, Cong Shang, et al. Mechanically Strong Janus Poly(
Simple preparation of stimuli-responsive hydrogels with good mechanical properties and mild stimuli-responsiveness is essential for their applications as smart soft robots. Mechanically strong Janus poly(
N
-isopropylacrylamide)/graphene oxide (PNIPAM/GO) nanocomposite hydrogels with stimuli-responsive bending behaviors are prepared through a simple one-step method by using molds made of a Teflon plate and a glass plate. Residual oxygen in the air bubbles on the Teflon plate surface affects the polymerization and hence the cross-linking density
leading to the different swelling/deswelling rates of the two sides of the gels. Therefore
the hydrogels exhibit bending/unbending behaviors upon heating/cooling in water. The incorporation of GO nanosheets dramatically enhances the mechanical properties of Janus hydrogels. Meanwhile
the photo-responsive property of the GO nanosheets also imparts the hydrogels with remote-controllable deformation under IR irradiation. The application of the Janus PNIPAM/GO hydrogels as thermo-responsive grippers is demonstrated.
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