德国德累斯顿工业大学Juliane Simmchen团队开发出由电化交换反应驱动的高效活性胶体。相关研究成果于2021年9月15日发表在《美国化学会杂志》。

该文中，研究人员将合适反应的范围扩大到店化交换过程，或用更贵金属的溶解离子物种对固体金属层进行电化学替换。研究人员研究了运动的细节和不同反应参数的影响，得出结论，该电泳过程绕过了在催化微电机中失去效率的几个步骤。

此外，研究人员还研究了导致该高效新型主动运动的化学过程、电荷和流动条件。为了更好地理解基本过程，研究人员提出了一个电动模型，并通过有限元数值求解。

附：英文原文

Title: Highly Efficient Active Colloids Driven by Galvanic Exchange Reactions

Author: Linda Feuerstein, Carl Georg Biermann, Zuyao Xiao, Christian Holm, Juliane Simmchen

Issue&Volume: September 15, 2021

Abstract: Micromotors are propelled by a variety of chemical reactions, with most of them being of catalytic nature. There are, however, systems based on redox reactions, which show clear benefits for efficiency. Here, we broaden the spectrum of suitable reactions to galvanic exchange processes, or an electrochemical replacement of a solid metal layer with dissolved ionic species of a more noble metal. We study the details of motility and the influence of different reaction parameters to conclude that these galvanophoretic processes circumvent several steps that lose efficiency in catalytic micromotors. Furthermore, we investigate the chemical process, the charge, and flow conditions that lead to this highly efficient new type of active motility. Toward a better understanding of the underlying processes, we propose an electrokinetic model that we numerically solve via finite elements.

DOI: 10.1021/jacs.1c06400

Source: https://pubs.acs.org/doi/10.1021/jacs.1c06400