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

microstreaming, microfluidic, bubble, meniscus, acoustic, ultrasound

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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Nanotech 2007 Conference Program Abstract


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