Persistence length regulates emergent dynamics in active roller ensembles
Persistence length regulates emergent dynamics in active roller ensembles
复制标题
持续长度调节主动滚轮组中的紧急动态
DOI：
10.1039/d1sm00363a
复制
发表时间：
2021
期刊：
影响因子：
3.4
通讯作者：
Snezhko, Alexey
中科院分区：
文献类型：
--
作者：
Zhang, Bo;Karani, Hamid;Vlahovska, Petia M.;Snezhko, Alexey
活性胶体流体，生物和合成，往往表现出复杂的自组织和集体行为的出现。近年来，在多种活性物质系统中发现了多个涡旋的自发形成，然而，不受几何约束控制的活性涡旋的产生和可调谐性仍然是一个挑战。在这里，我们利用的持久性长度的单个粒子在合奏的积极辊调整形成的漩涡，并编排其特征尺寸。我们使用两个系统，并采用两种不同的方法，利用形状各向异性或偏振存储器的个别单位的持久性长度的控制。我们描述了紧急多涡状态的动力学，并揭示了持续长度的行为和紧急涡的属性之间的直接联系。我们进一步展示了两个系统之间的共同特征，包括相邻涡旋的反铁磁有序性和粒子速度场能谱中具有特征能量级联的活跃湍流行为。我们的研究结果提供了深入了解主动辊系统的时空相干性的发病，并提出了一个控制旋钮的操纵动态自组装在主动胶体合奏。
Active colloidal fluids, biological and synthetic, often demonstrate complex self-organization and the emergence of collective behavior. Spontaneous formation of multiple vortices has been recently observed in a variety of active matter systems, however, the generation and tunability of the active vortices not controlled by geometrical confinement remain challenging. Here, we exploit the persistence length of individual particles in ensembles of active rollers to tune the formation of vortices and to orchestrate their characteristic sizes. We use two systems and employ two different approaches exploiting shape anisotropy or polarization memory of individual units for control of the persistence length. We characterize the dynamics of emergent multi-vortex states and reveal a direct link between the behavior of the persistence length and properties of the emergent vortices. We further demonstrate common features between the two systems including anti-ferromagnetic ordering of the neighboring vortices and active turbulent behavior with a characteristic energy cascade in the particles velocity field energy spectra. Our findings provide insights into the onset of spatiotemporal coherence in active roller systems and suggest a control knob for manipulation of dynamic self-assembly in active colloidal ensembles.