Journal
Proceedings of the 2015 ICU International Congress on Ultrasonics
Volume 70, Issue -, Pages 34-37Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.phpro.2015.08.028
Keywords
acoustofluidics; traveling surface acoustic waves; particle separation; gradient generation; microfluidics; anechoic corner
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In this paper, we demonstrate the working principle of travelling surface acoustic waves (TSAWs) in a microfluidic system. The TSAWs were incorporated to separate polystyrene (PS) particles of variable diameters and perform controlled mixing of different chemicals for concentration gradient generation, both inside a polydimethylsiloxane (PDMS) microfluidic channel. The TSAWs generated an acoustic streaming flow (ASF) upon coupling with a liquid and exerted an acoustic radiation force (ARF) on the suspended particles. The ARF was theoretically estimated for PS microspheres suspended in water, and conditions for ARF dominance over ASF or vice versa were identified. Recently reported TSAW-based PS particles separation and gradient generation results by our group are summarized here. (C) 2015 The Authors. Published by Elsevier B.V.
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