2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Bubble-based actuation schemes for microfluididic chips

J. Xu, M. Dhur and D. Attinger
Columbia University, US

Keywords:
microstreaming, microfluidic, bubble, meniscus, acoustic, ultrasound

Abstract:
We describe the design and manufacturing of microfluidic chips, where injected gas plugs are used for actuation purposes. Different micro-geometries are compared in terms of their ability to stabilize a gas-liquid meniscus. Critical pressures needed to move the meniscus are measured and compared to theoretical result. When menisci are excited by ultrasound at frequencies in the 10-100 kHz range, their surfaces exhibit traveling and standing waves. A strong microstreaming field is observed around the meniscus, with velocities on the order of 1mm/s. We show that the excitation frequency controls the structure and intensity of the streaming. Superposing and controlling microstreaming patterns will provide ways to mix and move liquids in a microfluidic chip.

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