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

Multifunctional Microvalves Control by Optical Illumination on Nanoheaters and its Application in Centrifugal Microfluidic Devices

J-M Park, Y-K Cho, B-S Lee, J-G Lee and C. Ko
Samsung Advanced Institute of Technology, KR

microfluidics, microvalve, nanoparticles, centrifugal microfluidics, ferrofluid

We report ultrafast control of phase-change based microvalves utilizing nanoheaters; ferronanoparticles dispersed in paraffin wax, and heating by optical illumination using a 808 nm laser diode. High speed camera images showed that the actual response time to open the normally closed microvalve was only 0.012 sec at 46 kPa and to close the normally opened microvalve was only 0.444 sec. We further demonstrated sequential operation of multiple microvalves on a centrifugal microfluidic device using single laser diode. To the best of our knowledge, it is the first to use optical excitation of nanoparticles for the mechanism of microvalve operation. Because it is fast, robust, cost-effective, biocompatible, and simple to implement for the control of multiple microvalves on a chip, we believe it could be a key component to realize fully integrated lab-on-a-chip devices.

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Nanotech 2007 Conference Program Abstract


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