Nano Science and Technology Institute
Nanotech 2007 Vol. 3
Nanotech 2007 Vol. 3
Technical Proceedings of the 2007 NSTI Nanotechnology Conference and Trade Show, Volume 3
 
Chapter 4: Micro and Nano Fluidics
 

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

Authors:J-M Park, Y-K Cho, B-S Lee, J-G Lee and C. Ko
Affilation:Samsung Advanced Institute of Technology, KR
Pages:308 - 311
Keywords:microfluidics, microvalve, nanoparticles, centrifugal microfluidics, ferrofluid
Abstract: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.
Multifunctional Microvalves Control by Optical Illumination on Nanoheaters and its Application in Centrifugal Microfluidic DevicesView PDF of paper
ISBN:1-4200-6184-4
Pages:732
Hardcopy:$139.95
 
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