Self-assembled nematic colloidal motors powered by light.
Self-assembled nematic colloidal motors powered by light.
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DOI：
10.1038/s41467-018-07518-x
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发表时间：
2018-11-28
影响因子：
16.6
通讯作者：
Smalyukh II
中科院分区：
文献类型：
--
作者：
Yuan Y;Abuhaimed GN;Liu Q;Smalyukh II
生物马达是大自然的奇迹，它激发了具有类似纳米尺寸、高效率和多样化功能的合成马达的创造。分子马达已经被合成，但通过自组装获得纳米马达仍然具有挑战性。在这里，我们描述了一种自组装的胶体马达，它由浸没在液晶中的透明微粒在光驱动下重复旋转，并由非结构化~1 NW光连续照射而提供动力。偶氮苯分子的单层定义了液晶的光轴如何机械耦合到粒子的表面，以及它们如何随着光的偏振变化而联合旋转。旋转的粒子扭曲了液晶，从而改变了横穿光线的偏振。由此产生的反馈机制产生了一个连续的光-机械循环，并驱动单向粒子旋转，惯用手和频率由偏振和光强度强有力地控制。我们的发现可能导致与液晶显示技术兼容的光机械设备和胶体机。将能量转化为机械功的生物马达启发了合成马达的制造。在这里，作者展示了自组装的胶体马达，它被驱动到由液晶的光偏振和变形之间的反馈控制的响应范围。
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. Biological motors which convert energy into mechanical work inspire the fabrication of synthetic motors. Here the authors demonstrate self-assembled colloidal motors which are driven to a range of responses controlled by the feedback between light polarization and deformation of a liquid crystal.
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影响因子：
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作者：
Loudet, JC;Hanusse, P;Poulin, P
通讯作者：
Poulin, P
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通讯作者：
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