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(1) Scheme (a) and photographs of bilayer hydrogel as a four-arm gripper to capture the weight in response to pH (b) and temperature (c). (2) Scheme and photographs of the bilayer-type hydrogel as the bidirectional circuit switches: the disconnected state (a) and the connected state that turns on the red (b) or blue (c) light emitting diodes (LEDs). Reprinted from [218], Copyright (2018), with permission from Elsevier.
