writer：Jie Zhuo, Baoyi Wu, Jiawei Zhang,* Yu Peng, Huanhuan Lu, Xiaoxia Le, Shuxin Wei, and Tao Chen*
keywords：dual programming method, supramolecular assembly, shape memory, deformation of hydrogel, soft hydrogel robot
source：期刊
specific source：ACS Appl. Mater. Interfaces 2022, 14, 3551?3558
Issue time：2022年

The deformable diversity of organisms in nature has inspired the development of bionic hydrogel actuators. However, the anisotropic structures of hydrogel actuators cannot be altered after the fabrication process, which restricts hydrogel actuators to provide complex and diverse shape deformations. Herein, we propose a dual programming method to generate numerous anisotropic structures from initial isotropic gelatin-containing hydrogels; the isotropic hydrogel blocks could be first assembled into anisotropic structures based on the coil-triple helix transition of gelatin, and then, the assembled hydrogels could further be fixed into various temporary anisotropies, so that they can produce complex and diverse deformations under the stimulation of pH. In addition, the shape programming and deformation behaviors are reversible. This dual programming method provides more potential for the application of hydrogel actuators in soft robots and bionics.