Tuning the Random Walk of Active Colloids: From Individual Run-and-Tumble to Dynamic Clustering
Tuning the Random Walk of Active Colloids: From Individual Run-and-Tumble to Dynamic Clustering
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DOI：
10.1103/physrevlett.123.208002
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发表时间：
2019-11-14
影响因子：
8.6
通讯作者：
Vlahovska, Petia M.
中科院分区：
文献类型：
--
作者：
Karani, Hamid;Pradillo, Gerardo E.;Vlahovska, Petia M.
活性粒子，如游动的细菌或自推进的胶体，自发地自组织成大规模的动态结构。这些集体状态是从单个粒子的运动模式(通常是随机行走)中出现的，还有待于在定义明确的合成系统中进行探索。在这里，我们报告了可调谐胶体运动的实验实现，它再现了跑动和翻滚和Levy轨迹。我们利用Quincke效应来实现重复粒子运行和随机重定向的受控序列。我们发现，这些随机游走者的群体表现出令人想起细菌悬浮的行为，如动态集群和中尺度湍流样流。
Active particles such as swimming bacteria or self-propelled colloids spontaneously self-organize into large-scale dynamic structures. The emergence of these collective states from the motility pattern of the individual particles, typically a random walk, is yet to be probed in a well-defined synthetic system. Here, we report the experimental realization of tunable colloidal motion that reproduces run-and-tumble and Levy trajectories. We utilize the Quincke effect to achieve controlled sequences of repeated particle runs and random reorientations. We find that a population of these random walkers exhibit behaviors reminiscent of bacterial suspensions such as dynamic clusters and mesoscale turbulentlike flows.