Nonreciprocal collective dynamics in a mixture of phoretic Janus colloids

IF 2.8 2区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
Gennaro Tucci, Ramin Golestanian and Suropriya Saha
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引用次数: 0

Abstract

A multicomponent mixture of Janus colloids with distinct catalytic coats and phoretic mobilities is a promising theoretical system to explore the collective behavior arising from nonreciprocal interactions. An active colloid produces (or consumes) chemicals, self-propels, drifts along chemical gradients, and rotates its intrinsic polarity to align with a gradient. As a result the connection from microscopics to continuum theories through coarse-graining couples densities and polarization fields in unique ways. Focusing on a binary mixture, we show that these couplings render the unpatterned reference state unstable to small perturbations through a variety of instabilities including oscillatory ones which arise on crossing an exceptional point or through a Hopf bifurcation. For fast relaxation of the polar fields, they can be eliminated in favor of the density fields to obtain a microscopic realization of the Nonreciprocal Cahn–Hilliard model for two conserved species with two distinct sources of non-reciprocity, one in the interaction coefficient and the other in the interfacial tension. Our work establishes Janus colloids as a versatile model for a bottom-up approach to both scalar and polar active mixtures.
相思胶体混合物中的非互惠集体动力学
獐牙菜胶体的多组分混合物具有不同的催化外衣和游动性,是探索非互惠相互作用产生的集体行为的一个很有前途的理论系统。活性胶体产生(或消耗)化学物质,自我推进,沿化学梯度漂移,并旋转其固有极性以与梯度保持一致。因此,通过粗粒化将密度和极化场以独特的方式从微观联系到连续理论。我们以二元混合物为研究对象,展示了这些耦合通过各种不稳定性(包括在跨越异常点或霍普夫分岔时产生的振荡不稳定性)使无模式参考态对微小扰动不稳定。为了实现极性场的快速弛豫,可以消除极性场,转而采用密度场,从而在微观上实现两个保守物种的非互惠卡恩-希利亚德模型(Nonreciprocal Cahn-Hilliard),该模型有两个不同的非互惠源,一个是相互作用系数,另一个是界面张力。我们的工作确立了 Janus 胶体作为自下而上方法处理标量和极性活性混合物的通用模型的地位。
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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来源期刊
New Journal of Physics
New Journal of Physics 物理-物理:综合
CiteScore
6.20
自引率
3.00%
发文量
504
审稿时长
3.1 months
期刊介绍: New Journal of Physics publishes across the whole of physics, encompassing pure, applied, theoretical and experimental research, as well as interdisciplinary topics where physics forms the central theme. All content is permanently free to read and the journal is funded by an article publication charge.
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