| 초록 |
Herein, we present a new class of humidity-responsive liquid crystal elastomer (LCE) incorporating dimethylamino moities that can be prepared by versatile processing, including surface alignment as well as 3D printing. The humidity-responsive properties are introduced by activating one of the LCE surfaces with an acidic solution, which generates cations on the surface, and provides asymmetric hydrophilicity to the LCE. The resulting humidity-responsive LCE undergoes programmed and reversible hygroscopic actuation, and its shape transformation can be directed by the cut angle with respect to a nematic director or by localizing activation regions in the LCE. Most importantly, various humidity-responsive LCE actuators, including a flower, a concentric square array, and a soft gripper, are successfully fabricated by employing LC inks in direct-ink-writing 3D printing. |
