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Rapid proton diffusion in microfluidic devices by means of micro-LIF technique

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Abstract

The micro-LIF (laser-induced fluorescence) technique was applied to the measurement of pH distributions in a chemically reacting flow in a microfluidic device. Two liquid streams were combined at the junction of a Y-shaped microchannel (100-μm width and 33-μm depth), and allowed to diffuse into each other and react. The results for non-reacting fluids (hydrochloric acid and water) show good agreement with theoretical values calculated using conventional diffusion. When a reaction occurred (hydrochloric acid and sodium hydroxide), a large difference between the measurement results and the theoretical values was observed, indicating rapid proton diffusion compared with the theoretically calculated values.

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Acknowledgements

The authors wish to thank Prof. Madarame of the University of Tokyo, Japan for the fruitful discussions related to this work. This work was partly supported by a Grant-in-Aid for Scientific Research (B) 15360092, from the Ministry of Education, Culture, Sports, Science and Technology, Japan.

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Authors and Affiliations

  1. Department of Quantum Engineering and Systems Science, University of Tokyo, 7-3-1 Hongo, 113-8656, Bunkyo-ku, Tokyo, Japan

    K. Shinohara, Y. Sugii & K. Okamoto

  2. Department of Applied Chemistry, University of Tokyo, 7-3-1 Hongo, 113-8656, Bunkyo-ku, Tokyo, Japan

    A. Hibara & T. Kitamori

  3. Integrated Chemistry Project, Kanagawa Academy of Science and Technology (KAST), Sakado, Takatsu-ku, 213-0012, Kawasaki-shi, Kanagawa, Japan

    M. Tokeshi

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  1. K. Shinohara
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  2. Y. Sugii
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  3. A. Hibara
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  4. M. Tokeshi
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  5. T. Kitamori
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  6. K. Okamoto
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Correspondence to K. Shinohara.

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Shinohara, K., Sugii, Y., Hibara, A. et al. Rapid proton diffusion in microfluidic devices by means of micro-LIF technique. Exp Fluids 38, 117–122 (2005). https://doi.org/10.1007/s00348-004-0906-z

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  • DOI: https://doi.org/10.1007/s00348-004-0906-z

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