Supramolecular Assemblies in Active Motor-Filament Systems: Micelles, Bilayers, and Foams,Physical Review X

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Supramolecular Assemblies in Active Motor-Filament Systems: Micelles, Bilayers, and Foams
Physical Review X ( IF 11.6 ) Pub Date : 2024-08-19 , DOI: 10.1103/physrevx.14.031031
Filippo De Luca ₁ , Ivan Maryshev ₁ , Erwin Frey _{1,

2}

Affiliation

Active matter systems evade the constraints of thermal equilibrium, leading to the emergence of intriguing collective behavior. A paradigmatic example is given by motor-filament mixtures, where the motion of motor proteins drives alignment and sliding interactions between filaments and their self-organization into macroscopic structures. After defining a microscopic model for these systems, we derive continuum equations, exhibiting the formation of active supramolecular assemblies such as micelles, bilayers, and foams. The transition between these structures is driven by a branching instability, which destabilizes the orientational order within the micelles, leading to the growth of bilayers at high microtubule densities. Additionally, we identify a fingering instability, modulating the shape of the micelle interface at high motor densities. We study the role of various mechanisms in these two instabilities, such as contractility, active splay, and anchoring, allowing for generalization beyond the system considered here.

Published by the American Physical Society

2024

中文翻译：

主动电机丝系统中的超分子组装体：胶束、双层和泡沫

活性物质系统逃避了热平衡的约束，导致了有趣的集体行为的出现。一个典型的例子是运动丝混合物，其中运动蛋白的运动驱动丝之间的对齐和滑动相互作用，并且它们的自组织形成宏观结构。在为这些系统定义了一个微观模型后，我们推导出了连续介质方程，展示了活性超分子组装体（如胶束、双层和泡沫）的形成。这些结构之间的过渡是由分支不稳定性驱动的，它破坏了胶束内的方向顺序，导致高微管密度下双层的生长。此外，我们确定了指法不稳定性，在高运动密度下调节胶束界面的形状。我们研究了各种机制在这两种不稳定性中的作用，例如收缩、主动张开和锚定，从而允许超越此处考虑的系统进行推广。美国物理学会 2024 年出版

更新日期：2024-08-19

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