Nature provides much inspiration for the design of materials capable of motion upon exposure to external stimuli, and many examples of such active systems have been created in the laboratory. However, to achieve continuous motion driven by an unchanging, constant stimulus has proven extremely challenging. Here we describe a liquid crystalline polymer film doped with a visible light responsive fluorinated azobenzene capable of continuous chaotic oscillatory motion when exposed to ambient sunlight in air. The presence of simultaneous illumination by blue and green light is necessary for the oscillating behaviour to occur, suggesting that the dynamics of continuous forward and backward switching are causing the observed effect. Our work constitutes an important step towards the realization of autonomous, persistently self-propelling machines and self-cleaning surfaces powered by sunlight.

中文翻译：

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混沌的自激阳光驱动的聚合物致动器。

大自然为设计能够在暴露于外部刺激下运动的材料提供了很多灵感，并且在实验室中创建了这种主动系统的许多示例。然而，要实现由不变的恒定刺激驱动的连续运动，已证明极具挑战性。在这里，我们描述了一种掺杂有可见光响应的氟化偶氮苯的液晶聚合物膜，当暴露于空气中的环境日光下时，它能够连续进行混沌振荡运动。为了发生振荡行为，必须同时存在蓝光和绿光照明，这表明连续向前和向后切换的动力学正在引起所观察到的效果。我们的工作是朝着实现自主，自主，创新的方向迈出的重要一步，