A Light-Activated Polymer Composite Enables On-Demand Photocontrolled Motion: Transportation at the Liquid/Air Interface
A Light-Activated Polymer Composite Enables On-Demand Photocontrolled Motion: Transportation at the Liquid/Air Interface
复制标题
光激活聚合物复合材料可实现按需光控运动：液体/空气界面的运输
DOI：
10.1002/anie.201811808
复制
发表时间：
2019-02-25
影响因子：
16.6
通讯作者：
Yu, Haifeng
中科院分区：
文献类型：
--
作者：
Ma, Shudeng;Li, Xiao;Yu, Haifeng
液/气界面上的游动分子由于其潜在的应用前景而引起了人们的极大关注。本文描述了一种基于光敏液晶聚合物网络和市售聚酰亚胺（Kapton）的双晶复合结构的新型光驱动游泳器。游泳者的运动可以通过光照射来控制。双层结构的膜显示出快速的光致弯曲朝向Kapton侧暴露于UV光后，并立即恢复后去除光。当被置于水面上时，游泳者通过有节奏地拍打液体来持续推进自己，就像海豚用尾鳍向前移动一样。此外，通过简单地改变长宽比和照射位置，模仿海豚胸鳍的功能，成功地实现了游泳者的光动力旋转。将向前运动和旋转运动结合在一起，可以在室温下轻松实现光驱动游泳者的按需方向控制，这为小型化运输装置带来了希望。
Swimmers at liquid/air interfaces have drawn enormous attention because of their potential applications. Described herein is one novel light-driven swimmer based on a bimorph composite structure of a photoresponsive liquid-crystalline polymer network and a commercially available polyimide (Kapton). The motion of the swimmer can be controlled by photoirradiation. The bilayer-structured film shows quickly photoinduced bending towards the Kapton side upon exposure to UV light, and recovers immediately after removal of light. When placed on a liquid surface, the swimmer propels itself continually though rhythmic beating the liquid like a dolphin moving forward with its tail fin. Besides, light-powered rotation of the swimmer is successfully achieved by simply changing the length-width ratio and the irradiation site, mimicking the function of a dolphin's pectoral fin. Combining the forward movement and rotation motion together, on-demand directional control of the photo-driven swimmer can be readily obtained at room temperature, showing promise for miniaturized units for transportation.