Journal of the Korean Society of Visualization (한국가시화정보학회지)

The Korean Society of Visualization (한국가시화정보학회)
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Mixing in a Microchannel by using Induced-charge Electro-osmosis

마이크로 채널 내 유도-전하 전기삼투에 의한 혼합

  • Received : 2010.09.27
  • Accepted : 2010.10.27
  • Published : 2010.12.31
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Abstract

This paper presents an experimental study on the performance of a micro-mixer using AC electro-osmotic flow. The microchannel is made of PDMS for the side and top walls and glass patterned with ITO for the bottom wall. We first investigated the effect of the applied potential as well as the frequency on the slip velocity. We have found that the slip velocity is roughly proportional to the applied voltage in line with the Helmholtz-Smoluchowski equation and there is an optimum frequency at which the slip velocity becomes maximized. To find the optimum parameters for mixing device we tested our device for various design parameters. It turned out that the best mixing effect is obtained approximately when the electrode angle is $30^{\circ}$, electrode width $200\;{\mu}m$, and the frequency of power supply 700 Hz.

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References

  1. Cha, J., Kim, J., Ryu, S.-K., Park, J., Jeong, Y., Park, S., Park, S., Kim, H.C. and Chun, K., 2006, “A highly efficient 3D micromixer using soft PDMS bonding,” J. Micromech. Microeng., Vol. 16, pp. 1778-1782 https://doi.org/10.1088/0960-1317/16/9/004
  2. Suh, Y.K., Heo, S.G., Heo, Y.G., Heo, H.S. and Kang, S., 2007, “Numerical and experimental study on achannel mixer with a periodic array of cross baffles,” J. Mech. Sci. Technol., Vol. 21, pp. 549-555 https://doi.org/10.1007/BF02916317
  3. Le, T.N., Suh, Y.K. and Kang, S., 2010, “A numerical study on the flow and mixing in a microchannel using magnetic particles,” J. Mech. Sci. Technol., Vol. 24, pp. 441-450. https://doi.org/10.1007/s12206-009-1107-8
  4. Tabeling, P., 2005, Introduction to Microfluidics. Oxford University Press.
  5. Lyklema, J., 1995, Fundamentals of Interface and Colloidal Science-Vol. II. Academic Press.
  6. Hunter, R.J., 2001, Foundations of Colloidal Science. Oxford University Press.
  7. Plecis, A. and Chen, Y., 2007, “Fabrication of microfluidic devices based on glass-PDMS-glass technology,” Microelectronic Engineering, Vol. 84, pp. 1265-1269. https://doi.org/10.1016/j.mee.2007.01.276
  8. Suh, Y.K. and Kang S., 2008, “Asymptotic analysis of ion transport in a nonlinear regime around polarized electrodes under ac,” Phys. Rev. E, Vol. 77(3), 031504. https://doi.org/10.1103/PhysRevE.77.031504
  9. Suh, Y.K., 2008, “AC-Electro-osmotic flows fundmental mechanism and kinematic aspects,” The Korean Society of Visualization, Vol. 6(1), pp. 3-16. https://doi.org/10.5407/JKSV.2008.6.1.003
  10. Suh, Y.K. and Kang, S., 2010, “A review on mixing in microfluidics,” Micromachines, Vol. 1(3), pp. 82-111. https://doi.org/10.3390/mi1030082