Phototriggered Complex Motion by Programmable Construction of Light-Driven Molecular Motors in Liquid Crystal Networks,Journal of the American Chemical Society

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Phototriggered Complex Motion by Programmable Construction of Light-Driven Molecular Motors in Liquid Crystal Networks
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2022-04-05 , DOI: 10.1021/jacs.2c01060
Jiaxin Hou _{1,

2} , Guiying Long ₁ , Wei Zhao ₃ , Guofu Zhou _{1,

3} , Danqing Liu _{3,

4} , Dirk J Broer _{3,

4} , Ben L Feringa _{1,

2} , Jiawen Chen ₁

Affiliation

Recent developments in artificial molecular machines have enabled precisely controlled molecular motion, which allows several distinct mechanical operations at the nanoscale. However, harnessing and amplifying molecular motion along multiple length scales to induce macroscopic motion are still major challenges and comprise an important next step toward future actuators and soft robotics. The key to addressing this challenge relies on effective integration of synthetic molecular machines in a hierarchically aligned structure so numerous individual molecular motions can be collected in a cooperative way and amplified to higher length scales and eventually lead to macroscopic motion. Here, we report the complex motion of liquid crystal networks embedded with molecular motors triggered by single-wavelength illumination. By design, both racemic and enantiomerically pure molecular motors are programmably integrated into liquid crystal networks with a defined orientation. The motors have multiple functions acting as cross-linkers, actuators, and chiral dopants inside the network. The collective rotary motion of motors resulted in multiple types of motion of the polymeric film, including bending, wavy motion, fast unidirectional movement on surfaces, and synchronized helical motion with different handedness, paving the way for the future design of responsive materials with enhanced complex functions.

中文翻译：

通过液晶网络中光驱动分子电机的可编程构造实现光触发复杂运动

人工分子机器的最新发展已经实现了精确控制的分子运动，这允许在纳米尺度上进行几种不同的机械操作。然而，利用和放大沿多个长度尺度的分子运动以诱导宏观运动仍然是主要挑战，并且是迈向未来致动器和软机器人的重要下一步。解决这一挑战的关键在于将合成分子机器有效地集成到分层排列的结构中，因此可以以合作的方式收集大量单独的分子运动，并将其放大到更高的长度尺度，并最终导致宏观运动。在这里，我们报告了嵌入由单波长照明触发的分子马达的液晶网络的复杂运动。通过设计，外消旋和对映体纯分子马达都以可编程的方式集成到具有确定方向的液晶网络中。电机具有多种功能，可在网络内充当交联剂、致动器和手性掺杂剂。电机的集体旋转运动导致聚合物薄膜的多种运动，包括弯曲、波浪运动、表面上的快速单向运动以及不同旋向的同步螺旋运动，为未来设计具有增强复杂性的响应材料铺平了道路功能。

更新日期：2022-04-05

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