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科学家开发出金属-有机框架的多面体微电机
作者:小柯机器人 发布时间:2021/11/20 22:12:20

香港大学Yufeng Wang研究组开发出金属-有机框架的多面体微电机。相关论文于2021年11月17日在线发表于国际学术期刊《美国化学会杂志》。

据研究人员介绍,胶体微电机可以自主推进,这是因为它们打破了对称性,导致局部机械力不平衡。最常见的是,微电机被合成为具有Janus结构或其变体,有两个在形状、成分或表面上不同的组件在相对的一面连接在一起。

研究人员报告了另一种创造微电机的方法,在交流电场下,具有各种多面体形状的金属有机框架(MOF)的微晶体被推进。在这些情况下,对称性的打破是通过将多面体颗粒定向到一个独特的方向来产生不均匀的电液动力流。粒子的方向是由施加在粒子上的电力和引力之间的微妙竞争控制的,研究人员用实验和理论模型进行了解释。

此外,通过利用MOF的类型和形状,或表面特性,研究人员表明MOF电机的推进力可以被调整或逆转。由于MOF设计的灵活性和其一步可扩展的合成,研究人员的策略对于制造定义明确的功能性微电机来说是简单而通用的。

附:英文原文

Title: Polyhedral Micromotors of Metal–Organic Frameworks: Symmetry Breaking and Propulsion

Author: Zhisheng Wang, Wei Xu, Zuochen Wang, Dengping Lyu, Yijiang Mu, Wendi Duan, Yufeng Wang

Issue&Volume: November 17, 2021

Abstract: 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.

DOI: 10.1021/jacs.1c09439

Source: https://pubs.acs.org/doi/10.1021/jacs.1c09439

 

期刊信息

JACS:《美国化学会志》,创刊于1879年。隶属于美国化学会,最新IF:14.612
官方网址:https://pubs.acs.org/journal/jacsat
投稿链接:https://acsparagonplus.acs.org/psweb/loginForm?code=1000