writer：Nie, Z.; Zuo, B.; Wang, M.; Huang, S.; Chen X.; Liu, Z.; Yang, H.*
keywords：M?bius Strip
source：期刊
specific source：Nature Communications, 2021, 12, 2334.
Issue time：2021年

Twisted toroidal ribbons such as the one-sided M?bius strip have inspired scientists, engineers and artists for many centuries. A physical M?bius strip exhibits interesting mechanical

properties deriving from a tendency to redistribute the torsional strain away from the twist

region. This leads to the interesting possibility of building topological actuators with continuous deformations. Here we report on a series of corresponding bi-layered stripe actuators

using a photothermally responsive liquid crystal elastomer as the fundamental polymeric

material. Employing a special procedure, even M?bius strips with an odd number of twists

can be fabricated exhibiting a seamless homeotropic and homogeneous morphology.

Imposing a suitable contraction gradient under near-infrared light irradiation, these ribbons

can realize continuous anticlockwise/clockwise in-situ rotation. Our work could pave the way

for developing actuators and shape morphing materials that need not rely on switching

between distinct states.