Liquid Stratification and Diffusion-Induced Anisotropic Hydrogel Actuators with Excellent Thermosensitivity and Programmable Functionality. - Pengli Dong; Weizhong Xu; Zhongwen Kuang; Youxing Yao; Zhiqin Zhang; Daoyou Guo; Huaping Wu; Tingyu Zhao; Aiping Liu (Adv. Intell. Syst., 2021)