Abtract
Electro-osmosis is the flow produced by the action of an electric field on a fluid with a net charge, which is created by the Zeta potential and confined in the Debye layer. This basic phenomenon in the electro-kinetic transport plays an important role in the microfluidic systems being explored today because it can be applied to a variety of MEMS devices. This paper presents global and point-wise comparisons of experimental measurements of electro-osmotically driven flows in elementary microchannel configurations, which are made by photolithography using poly-di-methyl-siloxane (PDMS). To measure full field velocity distributions in PDMS microchannels, a microscopic particle image velocimetry (μ-PIV) system has been developed to track the fluorescent images of 500 nm diameter particles. Comparisons of experimental results among various micro-configurations show feasibilities of the electro-osmotic flows to use for micro-pumping and micro-fluidic flow control. st
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Arulanandam, S. and Li, D., Liquid Transport in Rectangular Microchannels by Electroosmotic Pumping, Colloid and Surfaces A: Physicochemical and Engineering, 161 (2000), 89.
Cummings, E. B., PIV Measurement of Electroosmotic and Pressure-driven Flow Components in Microfluidic System, Proc. of ASME MEMS., 1 (1999), 180.
Dutta, P. and Beskok, A., Analytical Solution of Combined Electroosmotic/Pressure Driven Flows in Two-dimensional Straight Channels: Finite Debye Layer Effects, Anal. Chem., 73–5 (2001), 1979.
Herr, A. E., Molho, J. I., Santiago, J. G., Mungal, M. G., Kenny, T. W. and Garguilo, M. G., Electroosmotic Capillary Flow with Nonuniform Zeta Potential, Anal. Chem., 72–5 (2000), 1053.
Inoue, S. and Spring, K. R., Video Microscopy, 2nd ed Plenum Press, Oxford. (1997).
Jones, T. B., Electromechanics of Particles, Cambridge University Press, Cambridge. (1995)
Kamholz, A. E., Schilling, E. A. and Yager, P., Optical Measurement of Transverse Molecular Diffusion in a Microchannel, Biophysical Journal., 80 (2001), 1967.
Kim, M. J., Kim, H. J. and Kihm, K. D., Micro-Scale PIV for Electroosmotic Flow Measurement, In process for the 3rd Pacific Symposium on Flow Visualization and Image Processing, Paper No. F3112 (2001).
Kim, M. J., Beskok, A. and Kihm, K. D., Electroosmosis-driven Micro-channel Flows: a Comparative Study of μ-PIV Measurements and Numerical Simulations, Experiments in Fluids., 33 (2002), 170.
Meinhart, C. D., Wereley, S. T. and Santiago, J. G., PIV Measurements of a Microchannel Flow, Experiments in Fluids., 27 (2000), 414.
Olsen, M. G. and Adrian, R. J., Out-of-focus Effects on Particle Image Visibility and Correlation in Microscopic Particle Image Velocimetry, Experiments in Fluids., 26:S, ( 2000) 166.
Probstein, R. F., Physicochemical Hydrodynamics, John Wiley & Sons Inc, New York. (1994)
Santiago, J. G., Wereley, S. T., Meinhart, C. D., Beebe, D. J. and Adrian, R. J., A Particle Image Velocimetry System Microfluidics, Experiments in Fluids., 25 (1998), 316.
Author information
Authors and Affiliations
Corresponding author
Additional information
MinJun Kim: He is a Ph. D. candidate in the Division of Engineering at Brown University. He received his MS in Mechanical Engineering in 2001 from Texas A&M University. He worked with Prof. Kihm in Micro-scale Fluidics & Heat Transport Laboratory of Texas A&M University as a graduate research assistant. He is affiliated at Microfluidics Laboratory and Center for Fluid Mechanics in Brown University. His research interests are bacterial flow, optical diagnostics for microfluidics and biofluidics, and micro-fabrication for MEMS devices.
Kenneth David Kihm: He is a professor of Mechanical Engineering at Texas A&M University. Prof. Kihm received his Ph.D. from Stanford University in 1987. His research interests include: development and applications of laser diagnostic techniques for heat and mass transfer problems, in particular, full-field velocity and temperature mapping diagnostics in the micro-scale flows.
Rights and permissions
About this article
Cite this article
Kim, M.J., Kihm, K.D. Microscopic PIV measurements for electro-osmotic flows in PDMS microchannels. J Vis 7, 111–118 (2004). https://doi.org/10.1007/BF03181583
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF03181583