Symmetrical Catalytic Colloids Display Janus-Like Active Brownian Particle Motion.
Symmetrical Catalytic Colloids Display Janus-Like Active Brownian Particle Motion.
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DOI：
10.1002/advs.202303154
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发表时间：
2023-11
期刊：
影响因子：
15.1
通讯作者：
Ebbens, Stephen J.
中科院分区：
文献类型：
--
作者：
Archer, Richard J.;Ebbens, Stephen J.
催化Janus胶体，一个半球被过氧化氢还原催化剂（如铂）覆盖，代表了自运动活性胶体系统中实验探索最多的例子之一。本文比较研究了溶液基金属盐还原法制备的对称催化胶体的运动行为。尽管催化活性分布存在显著差异，但本研究发现对称胶体产生的运动与先前报道的Janus胶体相当。结果还表明，通过掩蔽在对称胶体中引入Janus结构不会显著改变它们的运动。这些发现可能表明，表面反应性的微小变化足以产生类似Janus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，同时也展示了一种直接的途径来获得大量的可运动活性胶体，与那些具有Janus结构的胶体相比，这些胶体有望显示出微妙的不同现象学。在过氧化氢溶液中观察了铂盐还原法制备的具有对称催化活性的胶体在聚合物微球上的运动。胶体产生的自推进轨迹与观察到的催化Janus活性布朗粒子高度相似。讨论了这一发现可能产生的机制影响和新的应用。
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. The motion of symmetrically catalytically active colloids made by platinum salt reduction onto polymer microspheres is observed within hydrogen peroxide solutions. The colloids produce self‐propulsive trajectories that are highly analogous to those observed for catalytic Janus active Brownian particles. The possible mechanistic implications and new applications that this finding could enable are discussed.
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