Swimming Mechanicsms of Janus Micromotors: From Self- diffusiophoresis to Bubble Propulsion

Abstract eng:
The self-propelled Janus micromotors moving in low Reynolds number environments have attracted extensive attention. In this paper, we measure the translational motion of Pt-Si02 Janus microparticles (size d:20-50um) in H202 solutions, and report a three-stage typical behavior including self-diffiisiophoresis, bubble growth, and bubble collapse. This behavior is found to coincide with a transition from self- diffiisiophoresis to micro-bubble propulsion. The speed of the Janus microparticle due to bubble propulsion is observed to be about 1-2 order of magnitudes larger than that due to self-diffilsiophoresis. Furthermore, we show that a strong jet flow towards the Janus microparticle emerges during bubble collapse, which reveals a new mechanism of bubble collapse.

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