Hydrodynamics determines collective motion and phase behavior of active colloids in quasi-two-dimensional confinement.
Hydrodynamics determines collective motion and phase behavior of active colloids in quasi-two-dimensional confinement.
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DOI：
10.1103/physrevlett.112.118101
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发表时间：
2013-09
影响因子：
8.6
通讯作者：
A. Zöttl;H. Stark
中科院分区：
文献类型：
--
作者：
A. Zöttl;H. Stark
我们研究了受限制的球形微游泳者的集体运动，如活性胶体，我们用所谓的蠕动器来模拟。为了模拟含热噪声的流体动力流场，我们采用了多粒子碰撞动力学方法。我们证明了在蠕动体之间以及蠕动体和边界壁之间的流体动力近场至关重要地决定了它们的集体运动。特别是，随着密度的增加，我们观察到中性蠕动者明显的相分离为气相和团簇相，而强推力和强拉力者则逐渐接近六边形团簇态。
We study the collective motion of confined spherical microswimmers such as active colloids which we model by so-called squirmers. To simulate hydrodynamic flow fields including thermal noise, we use the method of multiparticle collision dynamics. We demonstrate that hydrodynamic near fields acting between squirmers as well as between squirmers and bounding walls crucially determine their collective motion. In particular, with increasing density we observe a clear phase separation into a gaslike and cluster phase for neutral squirmers whereas strong pushers and pullers more gradually approach the hexagonal cluster state.