JOURNAL ARTICLE

A millisecond micromixer via single-bubble-based acoustic streaming

Daniel Ahmed, Xiaole Mao, Jinjie Shi, Bala Krishna Juluri, Tony Jun Huang
Lab on a Chip 2009 September 21, 9 (18): 2738-41
19704991
We present ultra-fast homogeneous mixing inside a microfluidic channel via single-bubble-based acoustic streaming. The device operates by trapping an air bubble within a "horse-shoe" structure located between two laminar flows inside a microchannel. Acoustic waves excite the trapped air bubble at its resonance frequency, resulting in acoustic streaming, which disrupts the laminar flows and triggers the two fluids to mix. Due to this technique's simple design, excellent mixing performance, and fast mixing speed (a few milliseconds), our single-bubble-based acoustic micromixer may prove useful for many biochemical studies and applications.

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