writer：Wang, M.; Han, Y.; Guo, L.; Lin, B.; Yang, H.*
keywords：liquid crystal elastomer
source：期刊
specific source：Liquid Crystals, 2019, 46, 1231-1240.
Issue time：2019年

In this manuscript, we describe a photo-responsive

dual-layer polysiloxane-based liquid crystal elastomer (LCE) soft actuator with

switchable handedness of helical curling motions. Benefited from the embedded

organic near-infrared (NIR) absorbing dye, the LCE ribbon can perform an

impressive one-handed helical curling deformation under NIR light irradiation,

meanwhile execute another-handed helical curling deformation under ultraviolet

(UV) light irradiation due to the trans-cis isomerization effect of azobenzene. This

work demonstrates that the handedness of helical curling motions of LCE soft

actuators can be reversibly altered by modulating the wavelength band of light

stimuli (UV vs. NIR), which might have potential applications in control

devices.