Binary pusher–puller mixtures of active microswimmers and their collective behaviour
Binary pusher–puller mixtures of active microswimmers and their collective behaviour
复制标题
活跃微型游泳者的二元推拉混合物及其集体行为
作者：
Giorgio Pessot;H. Löwen;A. Menzel
微游泳者是一种微小的活性粒子，通过使周围的流体运动而自我推进。根据它们所引起的远场流体流动的种类，它们被分为推手和拉手。许多研究已经探索了推手或拉手悬架之间的异同，但两者混合的行为仍有待研究。在这里，我们依赖于一个最小的离散微游泳模型，粒子分解，包括流体动力相互作用，来检查这种二元推拉混合物的方向顺序。与现有文献一致，我们发现我们的单分散悬架的推手不显示对齐，而那些单独的拉自发发展有序的集体运动。通过连续改变二元混合物的组成，从纯拉杆系统开始，我们发现有序的集体运动在很大程度上保持到推杆-拉杆组成比约为1:2。令人惊讶的是，当推动者被大多数推动者包围时，推动者的排列比系统中平均总体方向顺序所显示的要紧密得多。我们的研究概述了如何通过与其他物种的掺杂将主动微游泳者悬浮液的取向顺序调整到所需的程度。图形抽象
ABSTRACT Microswimmers are active particles of microscopic size that self-propel by setting the surrounding fluid into motion. According to the kind of far-field fluid flow that they induce, they are classified into pushers and pullers. Many studies have explored similarities and differences between suspensions of either pushers or pullers, but the behaviour of mixtures of the two is still to be investigated. Here, we rely on a minimal discrete microswimmer model, particle-resolved, including hydrodynamic interactions, to examine the orientational ordering in such binary pusher–puller mixtures. In agreement with existing literature, we find that our monodisperse suspensions of pushers do not show alignment, whereas those of solely pullers spontaneously develop ordered collective motion. By continuously varying the composition of the binary mixtures, starting from pure puller systems, we find that ordered collective motion is largely maintained up to pusher–puller composition ratios of about 1:2. Surprisingly, pushers when surrounded by a majority of pullers are more tightly aligned than indicated by the average overall orientational order in the system. Our study outlines how orientational order can be tuned in active microswimmer suspensions to a requested degree by doping with other species. GRAPHICAL ABSTRACT
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活性和被动颗粒混合物中活性诱导的相分离和自组装
影响因子：
8.6
作者：
J. Stenhammar;R. Wittkowski;D. Marenduzzo;M. E. Cates
通讯作者：
M. E. Cates
DOI：
10.1103/physreve.90.032304
发表时间：
2012-10
期刊：
Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子：
--
作者：
Ricard Matas-Navarro;R. Golestanian;T. Liverpool;S. Fielding
通讯作者：
Ricard Matas-Navarro;R. Golestanian;T. Liverpool;S. Fielding
影响因子：
8.6
作者：
A. Zöttl;H. Stark
通讯作者：
A. Zöttl;H. Stark
DOI：
10.1063/1.4939630
发表时间：
2015-10
期刊：
The Journal of chemical physics
影响因子：
--
作者：
A. Menzel;A. Saha;Christian Hoell;H. Löwen
通讯作者：
A. Menzel;A. Saha;Christian Hoell;H. Löwen
影响因子：
8.6
作者：
Hennes, Marc;Wolff, Katrin;Stark, Holger
通讯作者：
Stark, Holger