writer：Chunxin Ma, Xiaoxia Le, XL Tang, J He, P Xiao, J Zheng, W Lu, Jiawei Zhang,* YJ Huang, Tao Chen*
keywords：anisotropic hydrogels, multi-responsive, 3D complex deformations, UV-reduced graphene oxide
source：期刊
specific source：Adv. Funct. Mater., 2016, 26, 8670-8676
Issue time：2016年
As one of the most promising smart materials, stimuli-responsive polymer hydrogels (SPHs) can reversibly change the volume or shapes in response to external stimuli, they thus have shown promising applications in many fields. While considerable progress of two-dimensional (2D) deformation of SPHs has been achieved, the realization of three-dimensional (3D) or even more complex deformation still remains a significant challenge. Herein, we report a general strategy towards designing multi-responsive macroscopically anisotropic SPHs (MA-SPHs) with the ability of 3D complex deformations. Through a local UV-reduction of GOs with a patterned fashion in the GO-poly(N-isopropylacrylamide) (GO-PNIPAM) composite hydrogel sheet, MA-SPHs could be achieved after the introduction of a second poly(methylacrylic acid) (PMAA) network in the unreduced part of GO-PNIPAM hydrogel sheet. The resulted 3D MA-SPHs can provide remote-controllable light-driven, as well as thermo, pH and ionic strength (IS) triggered multi-responsive 3D complex deformations. Our approaches may provide some new insights in designing and fabricating of intelligent soft materials for bio-inspired applications.