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

IF 11.6 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Physical Review X Pub Date : 2024-08-19 DOI:10.1103/physrevx.14.031031
Filippo De Luca, Ivan Maryshev, Erwin Frey
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Abstract

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.

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主动电机丝系统中的超分子组装:胶束、双层膜和泡沫
活性物质系统会逃避热平衡的限制,从而产生有趣的集体行为。电机丝混合物就是一个典型的例子,电机蛋白的运动推动了丝之间的排列和滑动相互作用,并使它们自组织成宏观结构。在定义了这些系统的微观模型后,我们推导出连续方程,展示了胶束、双层膜和泡沫等活性超分子集合体的形成。这些结构之间的转换是由分支不稳定性驱动的,它破坏了胶束内定向秩序的稳定性,导致双分子层在高微管密度下生长。此外,我们还发现了一种指状不稳定性,可在高电机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,如收缩性、主动伸展性和锚定性,从而将其推广到本文所考虑的系统之外。
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来源期刊
Physical Review X
Physical Review X PHYSICS, MULTIDISCIPLINARY-
CiteScore
24.60
自引率
1.60%
发文量
197
审稿时长
3 months
期刊介绍: Physical Review X (PRX) stands as an exclusively online, fully open-access journal, emphasizing innovation, quality, and enduring impact in the scientific content it disseminates. Devoted to showcasing a curated selection of papers from pure, applied, and interdisciplinary physics, PRX aims to feature work with the potential to shape current and future research while leaving a lasting and profound impact in their respective fields. Encompassing the entire spectrum of physics subject areas, PRX places a special focus on groundbreaking interdisciplinary research with broad-reaching influence.
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