论文标题
由光动力的自组装列胶体电动机
Self-assembled nematic colloidal motors powered by light
论文作者
论文摘要
生物电动机是自然界的奇迹，它可以激发其合成对应物具有可比的纳米级维度，高效率和多种功能。分子电动机已经合成，但是通过自组装获得纳米运动仍然具有挑战性。在这里，我们描述了一种自组装的胶体电动机，其透明的微粒重复旋转，并浸入液晶中，并通过连续暴露于非结构化的〜1 NW光线。偶氮苯分子的单层定义了液晶光轴如何机械地耦合到粒子表面，以及它们如何随着光的极化变化而共同旋转。旋转粒子扭曲了液晶，这会改变遍历光的极化。所得的反馈机制产生了连续的光学机械循环，并驱动了单向粒子旋转，并通过偏振和光强度强稳定地控制了手工和频率。我们的发现可能会导致光学机械设备和与液晶显示技术兼容的胶体机器。
Biological motors are marvels of nature that inspire creation of their synthetic counterparts with comparable nanoscale dimensions, high efficiency and diverse functions. Molecular motors have been synthesized, but obtaining nanomotors through self-assembly remains challenging. Here we describe a self-assembled colloidal motor with a repetitive light-driven rotation of transparent micro-particles immersed in a liquid crystal and powered by a continuous exposure to unstructured ~1 nW light. A monolayer of azobenzene molecules defines how the liquid crystal's optical axis mechanically couples to the particle's surface, as well as how they jointly rotate as the light's polarization changes. The rotating particle twists the liquid crystal, which changes polarization of traversing light. The resulting feedback mechanism yields a continuous opto-mechanical cycle and drives the unidirectional particle spinning, with handedness and frequency robustly controlled by polarization and intensity of light. Our findings may lead to opto-mechanical devices and colloidal machines compatible with liquid crystal display technology.
