Symmetrical Catalytic Colloids Display Janus-Like Active Brownian Particle Motion,Advanced Science

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Symmetrical Catalytic Colloids Display Janus-Like Active Brownian Particle Motion
Advanced Science ( IF 14.3 ) Pub Date : 2023-10-23 , DOI: 10.1002/advs.202303154
Richard J Archer ₁ , Stephen J Ebbens ₂

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Catalytic Janus colloids, with one hemi-sphere covered by a hydrogen peroxide reduction catalyst such as platinum, represent one of the most experimentally explored examples of self-motile active colloid systems. This paper comparatively investigates the motile behavior of symmetrical catalytic colloids produced by a solution-based metal salt reduction process. Despite the significant differences in the distribution of catalytic activity, this study finds that the motion produced by symmetrical colloids is equivalent to that previously reported for Janus colloids. It also shows that introducing a Janus structure to the symmetrical colloids via masking does not significantly modify their motion. These findings could indicate that very subtle variations in surface reactivity can be sufficient to produce Janus-like active Brownian particle-type motion, or that a symmetry-breaking phenomena is present. The study will consequently motivate fresh theoretical attention and also demonstrate a straightforward route to access large quantities of motile active colloids, which are expected to show subtly different phenomenology compared to those with Janus structures.

中文翻译：

对称催化胶体显示类双面活性布朗粒子运动

催化 Janus 胶体的一个半球被过氧化氢还原催化剂（例如铂）覆盖，代表了自驱动活性胶体系统中实验探索最多的例子之一。本文比较研究了基于溶液的金属盐还原过程产生的对称催化胶体的运动行为。尽管催化活性的分布存在显着差异，但本研究发现对称胶体产生的运动与之前报道的 Janus 胶体相同。它还表明，通过掩蔽将 Janus 结构引入对称胶体不会显着改变它们的运动。这些发现可能表明，表面反应性的非常微妙的变化足以产生类似杰纳斯的活跃布朗粒子型运动，或者存在对称性破缺现象。因此，这项研究将激发新的理论关注，并展示一种获取大量运动活性胶体的直接途径，与具有两面性结构的胶体相比，预计这些胶体将表现出略有不同的现象学。

更新日期：2023-10-23

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