物理
气泡
杰纳斯
经典力学
运动(物理)
圆周运动
机械
统计物理学
纳米技术
材料科学
作者
Leilei Wang,Hangyu Li,Zhe Liu,Chenlu Li,Jing Zhang,Li Chen,Xinwei Wang,Dongshi Guan,Xu Zheng,Haihang Cui
摘要
The emerging application of a microbubble-driven micromotor encounters such a dilemma: persistence of long-distance transport is strongly desired, whereas the bubble micromotor usually manifests circular or spiral motions, which are supposed to be random owing to Brownian dynamics at the microscale. However, this assumption based on the model of active Brownian motion is debatable for bubble micromotors, and what mechanism could lead to deterministic motion of the bubble micromotor is still unclear. In this work, we show a counterintuitive phenomenon that a smaller bubble-driven Janus micromotor is more likely to manifest a straight trajectory than a larger one. Our model explains that the microbubble position determines the shape of the trajectory as the bubble introduces a propulsion force and a rotational torque to drive the motion of the micromotor. We perform numerical simulation to reveal how interfacial hydrodynamics coupled with surface chemical reaction determines the bubble nucleation position. Surprisingly, the result of predictable bubble position indicates a deterministic mechanism for the circular motion of a bubble-driven Janus micromotor, which shows good agreement with our experimental observation. Our findings provide valuable insight for developing manipulation strategies for bubble-driven micromotors/microrobots based on controllable deterministic mechanisms.
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