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-isopropylacrylamide) (PNIPAM) heterogeneous hydrogels, where self-regulated deformations are actuated using a fixed near-infrared laser. By utilizing the different responsiveness of PNIPAM hydrogels and those integrated with reduced graphene oxide (rGO), we have developed three heterogeneous hydrogel configurations: up-down, side-by-side, and hybrid types. These designs enable complex biomimetic deformations in soft hydrogel actuators, resembling a bending finger or a flexible industrial manipulator, all actuated using a single fixed-laser source. These proposed heterogeneous designs and actuation strategies leverage material intelligence to create soft actuators with enhanced autonomy, paving the way for soft automation, adaptive systems, and biomedical applications.
Li et al. (Wed,) studied this question.