writer：Chunxin Ma, Wei Lu, X. Yang, J. He, X. Le, L. Wang, Jiawei Zhang,* M. J.Serpe, Y. Huang, Tao Chen*
keywords：Hydrogel Actuator
source：期刊
specific source：Adv. Funct. Mater,2018, in press
Issue time：2018年

An effective approach to develop a novel

macroscopic anisotropic bilayer hydrogel actuator

with on-off switchable fluorescent color-changing function is reported. Through

combining a

collapsed thermo-responsive graphene oxide-poly(N-isopropylacrylamide)

(GO-PNIPAM)

hydrogel layer with a pH-responsive perylene bisimide-functionalized

hyperbranched

polyethylenimine (PBI-HPEI) hydrogel layer via macroscopic supramolecular

assembly, we

obtained a bilayer hydrogel that can be tailored and reswell to form a three

dimensional (3D)

hydrogel actuator. The actuator could undergo complex shape deformation caused

by the

PNIPAM outside layer, then the PBI-HPEI hydrogel inside layer could be unfolded

to trigger

the on-off switch of the pH-responsive fluorescence under the green light

irradiation. This

work will inspire the design and fabrication of novel biomimetic smart

materials with

synergistic functions.