Hydrodynamic Spin-Pairing and Active Polymerization of Oppositely Spinning Rotors

Mattan Gelvan, Artyom Chirko, Jonathan Kirpitch, Yahav Lavie, Noa Israel, Naomi Oppenheimer
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Abstract

Rotors are common in nature - from rotating membrane-proteins to superfluid-vortices. Yet, little is known about the collective dynamics of heterogeneous populations of rotors. Here, we show experimentally, numerically, and analytically that at small but finite inertia, a mixed population of oppositely spinning rotors spontaneously self-assembles into active chains, which we term gyromers. The gyromers are formed and stabilized by fluid motion and steric interactions alone. A detailed analysis of pair interaction shows that rotors with the same spin repel and orbit each other while opposite rotors spin-pair and propagate together as bound dimers. Rotor dimers interact with individual rotors, each other, and the boundaries to form chains. A minimal model predicts the formation of gyromers in numerical simulations and their possible subsequent folding into secondary structures of lattices and rings. This inherently out-of-equilibrium polymerization process holds promise for engineering self-assembled metamaterials such as artificial proteins.
对向旋转转子的水动力自旋配对和主动聚合作用
转子在自然界中很常见--从旋转的膜蛋白到超流体旋涡。然而,人们对异质转子群的集体动力学知之甚少。在这里,我们通过实验、数值和分析表明,在较小但有限的惯性条件下,正向旋转转子的混合群体会自发地自组装成活性链,我们称之为回旋体。回旋体的形成和稳定仅靠流体运动和立体相互作用。对相互作用的详细分析显示,具有相同自旋的转子相互排斥并绕行,而相反的转子自旋配对并以结合二聚体的形式一起传播。转子二聚体与单个转子、彼此以及边界相互作用形成链。一个最小模型预测了数值模拟中回旋体的形成,以及它们随后可能折叠成晶格和环状的二级结构。这种固有的非平衡聚合过程有望设计出自组装超材料,如人造蛋白质。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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