Polyhedral Micromotors of Metal–Organic Frameworks: Symmetry Breaking and Propulsion,Journal of the American Chemical Society

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Polyhedral Micromotors of Metal–Organic Frameworks: Symmetry Breaking and Propulsion
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2021-11-17 , DOI: 10.1021/jacs.1c09439
Zhisheng Wang ₁ , Wei Xu ₁ , Zuochen Wang ₁ , Dengping Lyu ₁ , Yijiang Mu ₁ , Wendi Duan ₁ , Yufeng Wang ₁

Affiliation

Colloidal micromotors can autonomously propel due to their broken symmetry that leads to unbalanced local mechanical forces. Most commonly, micromotors are synthesized to possess a Janus structure or its variants, having two components distinct in shape, composition, or surface joined together on opposite sides. Here, we report on an alternative approach for creating micromotors, where microcrystals of metal–organic frameworks (MOFs) with various polyhedral shapes are propelled under an AC electric field. In these cases, symmetry breaking is realized by orienting the polyhedral particles in a unique direction to generate uneven electrohydrodynamic flow. The particle orientations are controlled by a delicate competition between the electric and gravitational forces exerted on the particle, which we rationalize using experiments and a theoretical model. Furthermore, by leveraging the MOF types and shapes, or surface properties, we show that the propulsion of MOF motors can be tuned or reversed. Because of the flexibility in designing MOFs and their one-step scalable synthesis, our strategy is simple yet versatile for making well-defined functional micromotors.

中文翻译：

金属-有机框架的多面体微电机：对称破坏和推进

胶体微电机由于对称性的破坏会导致局部机械力不平衡，因此可以自主推进。最常见的是，微型马达被合成为具有 Janus 结构或其变体，具有在形状、组成或表面上不同的两个组件在相对侧连接在一起。在这里，我们报告了一种制造微型电机的替代方法，其中在交流电场下推动具有各种多面体形状的金属有机框架 (MOF) 微晶。在这些情况下，对称性破坏是通过将多面体粒子定向在一个独特的方向上以产生不均匀的电流体动力流来实现的。粒子方向由施加在粒子上的电力和重力之间的微妙竞争控制，我们使用实验和理论模型对其进行合理化。此外，通过利用 MOF 的类型和形状或表面特性，我们表明 MOF 电机的推进可以调整或反转。由于设计 MOF 及其一步可扩展合成的灵活性，我们的策略简单而通用，可用于制造定义明确的功能性微电机。

更新日期：2021-12-01

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