Journal
MICROFLUIDICS AND NANOFLUIDICS
Volume 14, Issue 3-4, Pages 591-596Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10404-012-1077-5
Keywords
Teardrop cavities; Microfluidics; Oscillating bubbles; Microflow; Acoustic actuation
Funding
- DARPA Young Faculty Award [N66001-11-1-4127]
- WSUV Faculty Research Mini-Grant
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Microstreaming generated from oscillating microbubbles has great potential in microfluidic applications for localized flow control. In this study, we explore the use of teardrop-shaped cavities for trapping microbubbles. Upon acoustic actuation, these microbubbles confined in teardrop cavities can be utilized to generate a directional microstreaming flow. We further show that by altering the acoustic excitation frequency, a flow-switch for altering flow direction in microfluidic environments can be achieved using two oppositely arranged teardrop cavities with different sizes. In the end, we show that an array of such bubble-filled teardrop cavities can act as a fixated microfluidic transport system allowing for on-chip particle manipulation in complex flow patterns. This inexpensive method to create flows to switch and transport elements based on teardrop cavities can be widely employed for microfluidic applications such as drug delivery systems.
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