In this study, we have demonstrated a particle separation device taking advantage of the ultra-high frequency sound waves. The sound waves, in the form of surface acoustic waves, are produced by an acoustofluidic platform build on top of a piezoelectric substrate bonded to a microfluidic channel. The particles’ mixture, pumped through the microchannel, is focused using a sheath fluid. A travelling surface acoustic wave (TSAW), propagating normal to the flow, interacts with the particles and deflect them from their original path to induce size-based separation in a continuous flow. We initially started the experiment with 40 MHz TSAWs for deflecting 10 μm diameter polystyrene particles but failed. However, larger diameter particles (∼ 30 μm) were successfully deflected from their streamlines and separated from the smaller particles (∼ 10 μm) using TSAWs with 40 MHz frequency. The separation of smaller diameter particles (3, 5 and 7 μm) was also achieved using an order of magnitude higher-frequency (∼ 133 MHz) TSAWs.
Ultra-High Frequency Sound Waves for Microparticle Separation
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Destgeer, G, Alazzam, A, & Sung, HJ. "Ultra-High Frequency Sound Waves for Microparticle Separation." Proceedings of the ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. Volume 2A: Fora, Part 2. Seoul, South Korea. July 26–31, 2015. V02AT18A002. ASME. https://doi.org/10.1115/AJKFluids2015-18682
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