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Collection of suspended particles in a drop using low frequency vibration

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4 Author(s)
Whitehill, James ; Department of Mechanical and Aerospace Engineering, Laboratory for Optics, Acoustics, and Mechanics, Monash University, Victoria 3800, Australia ; Neild, Adrian ; Ng, Tuck Wah ; Stokes, Mark

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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.

Published in:

Applied Physics Letters  (Volume:96 ,  Issue: 5 )