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

Jin-Cherng Shyu; Ching-Jiun Lee; Chung-Sheng Wei

doi:10.1117/1.3122367

1 April 2009 Design and fabrication of a passive microfluidic mixer with dynamic disturbance produced by catalytic chemical reactions

Jin-Cherng Shyu, Ching-Jiun Lee, Chung-Sheng Wei

Author Affiliations +

Journal of Micro/Nanolithography, MEMS, and MOEMS, Vol. 8, Issue 2, 021105 (April 2009). https://doi.org/10.1117/1.3122367

Abstract

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 1 mm and 50 µm, 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 x ≥ 15 mm for all H₂O₂ concentrations if Re=0.06 in the mixing channel. However, the H2O2 concentration has no significant effect on mixing provided Re ≥ 63.5. In addition, the maximum mixing enhancement for Q_L=1, 10, 100, and 1000 µL/min (Re=0.06, 0.63, 6.35, and 63.5) at x ≥ 15 mm are 5.7, 11.85, 6.27, and 4.8, respectively, with 0.1 M<[H₂O₂]<8.8 M in this study.

©(2009) Society of Photo-Optical Instrumentation Engineers (SPIE)

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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," Journal of Micro/Nanolithography, MEMS, and MOEMS 8(2), 021105 (1 April 2009). https://doi.org/10.1117/1.3122367

Published: 1 April 2009

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