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Phase separation of an active colloidal suspension via quorum-sensing
Soft Matter ( IF 2.9 ) Pub Date : 2021-1-28 , DOI: 10.1039/d0sm02131h Francis Jose 1, 2, 3, 4 , Shalabh K. Anand 1, 2, 3, 4 , Sunil P. Singh 1, 2, 3, 4
Soft Matter ( IF 2.9 ) Pub Date : 2021-1-28 , DOI: 10.1039/d0sm02131h Francis Jose 1, 2, 3, 4 , Shalabh K. Anand 1, 2, 3, 4 , Sunil P. Singh 1, 2, 3, 4
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We present the Brownian dynamics simulation of an active colloidal suspension in two dimensions, where the self-propulsion speed of a colloid is regulated according to the local density sensed by it. The role of concentration-dependent motility in the phase-separation of colloids and their dynamics is investigated in detail. Interestingly, the system phase separates at a very low packing fraction (Φ ≈ 0.125) at higher self-propulsion speeds (Pe), into a dense phase coexisting with a homogeneous phase and attains a long-range crystalline order beyond the transition point. The transition point is quantified here from the local density profiles and local and global-bond order parameters. We have shown that the characteristics of the phase diagram are qualitatively akin to the active Brownian particle (ABP) model. Moreover, our investigation reveals that the density-dependent motility amplifies the slow-down of the directed speed, which facilitates phase-separation even at low packing fractions. The effective diffusivity shows a crossover from quadratic rise to a power-law behavior of exponent 3/2 with Pe in the phase-separated regime. Furthermore, we have shown that the effective diffusion decreases exponentially with packing fraction in the phase-separated regime, while it shows a linear decrease in the single phase regime.
中文翻译：
活性胶体悬浮液通过群体感应的相分离
我们在两个方面介绍了活性胶体悬浮液的布朗动力学模拟，其中胶体的自推进速度根据其感知的局部密度来调节。详细研究了浓度依赖性运动性在胶体的相分离及其动力学中的作用。有趣的是，系统相以非常低的填充分数（Φ在较高的自推进速度（Pe）时≈≈0.125）进入密相与均质相共存，并在过渡点以外获得长程晶序。在此，从局部密度分布图以及局部和整体键合顺序参数来量化过渡点。我们已经证明，相图的特征在质量上类似于有源布朗粒子（ABP）模型。此外，我们的研究表明，密度相关的运动性会放大定向速度的减慢，即使在低填充分数下也有利于相分离。有效扩散率表明，在相分离状态下，Pe从二次上升到指数为3/2的幂律行为相交。此外，
更新日期：2021-02-22
中文翻译：
活性胶体悬浮液通过群体感应的相分离
我们在两个方面介绍了活性胶体悬浮液的布朗动力学模拟，其中胶体的自推进速度根据其感知的局部密度来调节。详细研究了浓度依赖性运动性在胶体的相分离及其动力学中的作用。有趣的是，系统相以非常低的填充分数（Φ在较高的自推进速度（Pe）时≈≈0.125）进入密相与均质相共存，并在过渡点以外获得长程晶序。在此，从局部密度分布图以及局部和整体键合顺序参数来量化过渡点。我们已经证明，相图的特征在质量上类似于有源布朗粒子（ABP）模型。此外，我们的研究表明，密度相关的运动性会放大定向速度的减慢，即使在低填充分数下也有利于相分离。有效扩散率表明，在相分离状态下，Pe从二次上升到指数为3/2的幂律行为相交。此外，
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