摘要：In active matter, the effective force between passive objects is crucial for their structure and dynamics, which is the basis for understanding the complex behaviors within active systems. Unlike equilibrium states, the factors such as the surface configuration, size, and confinement strength significantly influence the effective forces between passive particles. Previous studies have shown that the shapes of passive particles affect the aggregation of active particles, leading to different forces experienced by passive particles with different shapes. However, recently, a long-range attractive force between passive platelike particles, caused by the bacterial flow field instead of the direct bacterium-plate collisions in active bacterial suspensions, has been found. This raises an intriguing question: how does hydrodynamics affect the forces on passive particles of different shapes in different ways? In this work, we investigate the effective forces exerted on passive spherical and plate-like particles immersed in bacterial suspensions by optical-tweezers experiments. The effective force between passive particles can be calculated from the formula, Feff = k 鈱┾垎d鈱? /2, where 鈱┾垎d鈱? represents the difference in distance between the passive particles in the bacterial bath and those in the solution without bacteria, k is the effective stiffness of optical traps. The Feff > 0 indicates a repulsive force between passive particles, and the Feff 漏 2024 Chinese Physical Society.

ISSN号：1000-3290

卷、期、页：卷73期15

发表日期：2024-08-05

期刊分区（SCI为中科院分区）：四区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：Wuli Xuebao/Acta Physica Sinica

参与作者：张雪,杨明成,郑宁,刘鹏,彭毅

第一作者：宁鲁慧

论文类型：期刊论文

论文概要：宁鲁慧,张雪,杨明成,郑宁,刘鹏,彭毅，Effect of passive particle shape on effective force in active bath，Wuli Xuebao/Acta Physica Sinica，2024，卷73期15

论文题目：Effect of passive particle shape on effective force in active bath