Special Section on Theory and Practice of MEMS/NEMS/MOEMS, RF MEMS, and BioMEMS

Design and fabrication of a passive microfluidic mixer with dynamic disturbance produced by catalytic chemical reactions

[+] Author Affiliations
Jin-Cherng Shyu

National Kaohsiung University of Applied Sciences, Department of Mechanical Engineering, Kaohsiung, Taiwan 80778

Ching-Jiun Lee

National Taiwan University, Institute of Applied Mechanics, Taipei, Taiwan 10617

Chung-Sheng Wei

National Taiwan University, Nano-Electro-Mechanical-System Research Center, Taipei, Taiwan 10617

J. Micro/Nanolith. MEMS MOEMS. 8(2), 021105 (April 27, 2009). doi:10.1117/1.3122367
History: Received August 15, 2008; Revised February 09, 2009; Accepted March 02, 2009; Published April 27, 2009
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We report a novel passive microfluidic mixer design for mixing enhancement based on dynamic disturbances due to bubble generation produced by catalytic decomposition of hydrogen peroxide. A Y-shaped passive microfluidic mixer with a width and depth of 1mm and 50μm, respectively, with platinum deposition on the partial undersurface of the mixing channel for H2O2 catalytic decomposition, is demonstrated. Various Reynolds numbers (0.06 to 63.5) and H2O2 concentrations are tested to investigate their effects on the mixing. The experimental results show that mixing can be significantly improved either with the decrease of volumetric flow rate at a given H2O2 concentration or with the increase of H2O2 concentration at intermediate Reynolds numbers based on the present design. The mixing index scatters between 0.8 and 1.0 at x15mm for all H2O2 concentrations if Re=0.06 in the mixing channel. However, the H2O2 concentration has no significant effect on mixing provided Re63.5. In addition, the maximum mixing enhancement for QL=1, 10, 100, and 1000μLmin (Re=0.06, 0.63, 6.35, and 63.5) at x15mm are 5.7, 11.85, 6.27, and 4.8, respectively, with 0.1M<[H2O2]<8.8M in this study.

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© 2009 Society of Photo-Optical Instrumentation Engineers

Citation

Jin-Cherng Shyu ; Ching-Jiun Lee and Chung-Sheng Wei
"Design and fabrication of a passive microfluidic mixer with dynamic disturbance produced by catalytic chemical reactions", J. Micro/Nanolith. MEMS MOEMS. 8(2), 021105 (April 27, 2009). ; http://dx.doi.org/10.1117/1.3122367


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