吸引力
航程(航空)
光学镊子
机械
物理
中尺度气象学
领域(数学)
方向(向量空间)
经典力学
光学
材料科学
复合材料
几何学
气象学
语言学
数学
纯数学
哲学
作者
Luhui Ning,Xin Lou,Qingxin Ma,Yaochen Yang,Nan Luo,Ke Chen,Fanyu Meng,Xin Zhou,Mingcheng Yang,Yi Peng
标识
DOI:10.1103/physrevlett.131.158301
摘要
We perform optical-tweezers experiments and mesoscale fluid simulations to study the effective interactions between two parallel plates immersed in bacterial suspensions. The plates are found to experience a long-range attraction, which increases linearly with bacterial density and decreases with plate separation. The higher bacterial density and orientation order between plates observed in the experiments imply that the long-range effective attraction mainly arises from the bacterial flow field, instead of the direct bacterium-plate collisions, which is confirmed by the simulations. Furthermore, the hydrodynamic contribution is inversely proportional to the squared interplate separation in the far field. Our findings highlight the importance of hydrodynamics on the effective forces between passive objects in active baths, providing new possibilities to control activity-directed assembly.
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