Particle collection at low frequencies has been erstwhile demonstrated with dry particles and particles floating on the liquid surface. Nevertheless, the ability to collect suspended particles in a fluid offers arguably wider usage in the context of microfluidic or “lab-on-a-chip” systems. This is demonstrated here via an approach of vibrating a droplet to form resonant shapes on the liquid-gas interface. This results in particles ranging in size from 40 to 120 μm being collected predominantly at the solid-liquid interface due to a hydrodynamic focusing mechanism that develops through multiple cycles.
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