Laser-assisted active microfluidic mixer

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Proceedings title2010 International Symposium on Optomechatronic Technologies (ISOT)
ConferenceThe International Symposium on Optomechatronic Technologies (ISOT 2010), October 25-27, 2010, Toronto, Ontario, Canada
Pages15; # of pages: 5
SubjectMicrofluidics; micromixing; laser assisted; active micromixers
AbstractMany analytical microsystems use molecular diffusion to mix small quantities of different liquids. However, this passive mixing process requires a relatively long microchannel which may impose design restrictions on the physical dimensions of the fluidic network. To shorten the length of the mixing channels, an active micromixer driven by a focused laser beam is described in this paper. The proposed solution improves the mixing rate by using low power laser radiation to heat the disparate fluids being transported through the channels. The operating principle is based on the observation that the rate of molecular diffusion for non-reactive fluids increases with elevated temperature. Preliminary experiments on a Y-channel micromixer were conducted using a 1mW, 670nm laser. The laser beam was focused on the microchannel using a 100mm focal length objective lens. The laser-assisted mixing of the test fluids showed a 36.4% increase in the average diffusion coefficient value with 1 to 10 µL/min flow rates. The maximum percentage difference of diffusion distances had increased by approximately 7.85% over the non-laser-assisted conditions.
Publication date
AffiliationNational Research Council Canada
Peer reviewedNo
NRC number51011
NPARC number18398995
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Record identifier1d2a5009-d143-4af4-ad81-adb832059842
Record created2011-08-17
Record modified2016-05-09
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