催化活性胶体的沉降与悬浮
Sedimentation and Levitation of Catalytic Active Colloids
摘要：
通过使固体微粒的密度与周围流体的密度相匹配，可以很容易地关闭胶体悬浮液中的重力效应。通过研究具有可调浮力的催化微游泳者的运动，我们表明，这种策略不能被采用的活性胶体悬浮液。如果平均浮力减小，由于游动速度与引力场反向对齐，观察到样品池顶壁处的明显积聚。即使当粒子到达平壁时，引力矩仍然决定准二维主动运动的性质。我们的研究结果突出了重力在活跃系统中的微妙作用。
英文摘要：
Gravitational effects in colloidal suspensions can be easily turned off by matching the density of the solid microparticles with the one of the surrounding fluid. By studying the motion of catalytic microswimmers with tunable buoyant weight, we show that this strategy cannot be adopted for active colloidal suspensions. If the average buoyant weight decreases, pronounced accumulation at the top wall of a sample cell is observed due to a counter-alignment of the swimming velocity with the gravitational field. Even when the particles reach a flat wall, gravitational torques still determine the properties of the quasi two-dimensional active motion. Our results highlight the subtle role of gravity in active systems.
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