Photo-responsive Helical Motion by Light-Driven Molecular Motors in a Liquid-Crystal Network

Controlling sophisticated motion by molecular motors is a major goal on the road to future actuators and soft robotics. Taking inspiration from biological motility and mechanical functions common to artificial machines, responsive small molecules have been used to achieve macroscopic effects, however, translating molecular movement along length scales to precisely defined linear, twisting and rotary motions remain particularly challenging. Here, we present the design, synthesis and functioning of liquid-crystal network (LCN) materials with intrinsic rotary motors that allow the conversion of light energy into reversible helical motion. In this responsive system the photochemical-driven molecular motor has a dual function operating both as chiral dopant and unidirectional rotor amplifying molecular motion into a controlled and reversible left- or right-handed macroscopic twisting movement. By exploiting the dynamic chirality, directionality of motion and shape change of a single motor embedded in an LC-network, complex mechanical motions including bending, walking and helical motion, in soft polymer materials are achieved which offers fascinating opportunities toward inherently photo-responsive materials.

Automated summary

Innovatively designed liquid crystal network (LCN) materials utilize intrinsic rotary motors to convert light energy into reversible helical motion, achieving the translation of molecular movement into controlled linear, twisting, and rotating motions. By utilizing a photochemical-driven molecular motor as a chiral dopant and unidirectional rotor, this responsive system amplifies molecular motion into reversible left- or right-handed macroscopic twisting movement, showcasing fascinating opportunities for inherently photo-responsive materials.