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首页> 外文期刊>Physical review, E >Depletion forces on circular and elliptical obstacles induced by active matter
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Depletion forces on circular and elliptical obstacles induced by active matter

机译：活性物质诱导的圆形和椭圆形障碍的耗尽力

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摘要

Depletion forces exerted by self-propelled particles on circular and elliptical passive objects are studied using numerical simulations. We show that a bath of active particles can induce repulsive and attractive forces which are sensitive to the shape and orientation of the passive objects (either horizontal or vertical ellipses). The resultant force on the passive objects due to the active particles is studied as a function of the shape and orientation of the passive objects, magnitude of the angular noise, and distance between the passive objects. By increasing the distance between obstacles the magnitude of the repulsive depletion force increases, as long as such a distance is less than one active particle diameter. For longer distances, the magnitude of the force always decreases with increasing distance. We also found that attractive forces may arise for vertical ellipses at high enough area fraction.
机译：使用数值模拟研究了在圆形和椭圆形无源物体上施加的自推进颗粒施加的耗尽力。 我们表明，活性颗粒的浴可以诱导对被动物体的形状和取向敏感的令人厌恶和吸引力的力（水平或垂直椭圆形）。 由于活性物体的形状和取向而导致的被动物体上的所得力作为被动物体的形状和取向，角度噪声的幅度和被动物体之间的距离。 通过增加障碍物之间的距离，排斥耗尽力的幅度增加，只要这样的距离小于一个活性粒径即可。 对于更长的距离，力的大小随着距离的增加而始终减小。 我们还发现，足够足够高的区域分数的垂直椭圆可能出现有吸引力的力。

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