光化学驱动的AgCl Janus微电机作为模型系统，可理解离子自扩散电泳。,Langmuir

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光化学驱动的AgCl Janus微电机作为模型系统，可理解离子自扩散电泳。
Langmuir ( IF 3.7 ) Pub Date : 2018-02-13 00:00:00 , DOI: 10.1021/acs.langmuir.7b04301
Chao Zhou ₁ , H. P. Zhang _{2,

3} , Jinyao Tang ₄ , Wei Wang ₁

Affiliation

微型电动机是一类新兴的微型机械，可以在生物医学，环境修复和微型自组装中找到潜在的应用。了解他们的推进机制是他们未来发展的关键。对于由不对称表面光化学反应驱动的一类受欢迎的微型电动机尤其如此。这些微电机中的许多释放离子物质，并通过称为“离子自扩散电泳”的机制推进。但是，它的确切运行方式仍然模糊。为了解决这个基本但重要的问题，我们开发了一种电介质AgCl Janus微型电动机，当暴露于紫外线或强可见光下时，该电动机显然会从AgCl一侧移开。利用数值模拟和声悬浮技术，我们对其速度随时间衰减以及方向性提供了初步的解释。此外，光敏AgCl微电机表现出有趣的引力行为，暗示了三维运输或传感应用。当前的工作提出了一个易于控制且易于制造的模型系统，以理解化学动力微型电动机，并着重指出了声悬浮法对于研究不受边界影响的活性物质的有用性。

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Photochemically Powered AgCl Janus Micromotors as a Model System to Understand Ionic Self-Diffusiophoresis

Micromotors are an emerging class of micromachines that could find potential applications in biomedicine, environmental remediation, and microscale self-assembly. Understanding their propulsion mechanisms holds the key to their future development. This is especially true for a popular category of micromotors that are driven by asymmetric surface photochemical reactions. Many of these micromotors release ionic species and are propelled via a mechanism termed “ionic self-diffusiophoresis”. However, exactly how it operates remains vague. To address this fundamental yet important issue, we have developed a dielectric-AgCl Janus micromotor that clearly moves away from the AgCl side when exposed to UV or strong visible light. Taking advantage of numerical simulations and acoustic levitation techniques, we have provided tentative explanations for its speed decay over time as well as its directionality. In addition, photoactive AgCl micromotors demonstrate interesting gravitactic behaviors that hint at three-dimensional transport or sensing applications. The current work presents a well-controlled and easily fabricated model system to understand chemically powered micromotors, highlighting the usefulness of acoustic levitation for studying active matter free from the effect of boundaries.

更新日期：2018-02-13

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