Collection of suspended particles in a drop using low frequency vibration

Whitehill, James; Neild, Adrian; Tuck Wah Ng; Stokes, Mark
February 2010
Applied Physics Letters;2/1/2010, Vol. 96 Issue 5, p053501
Academic Journal
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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