Abstract
A surface in contact with an aqueous solution is electrically characterized by the zeta potential. One way of determining indirectly the zeta potential of a surface is by measuring the streaming currents generated by a Poiseuille flow through a capillary channel with charged walls. We report measurements of streaming current in individual rectangular glass/PDMS microchannels with integrated miniaturized electrodes. Experiments performed using solutions with different salt concentrations and different electrode materials showed that the measured electrical current depends on the electrode material and in general differs from the real value of the streaming current. To determine the streaming current from the experimental data, an equivalent circuit model is proposed. The extracted value of the streaming current is proportional to the flow rate of electrolyte and the calculated glass/PDMS zeta potential scales linearly with the logarithm of the salt concentration. This work offers a thorough analysis of the effects that come into play during streaming current measurements and, in particular, it describes potential sources of error that can affect the streaming current measurements and suggestions on how to correct the measured values.
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Acknowledgments
The authors wish to thank J. Bernardo, F. Silva, and V. Soares for help in clean room processing and characterization. D.C. Martins acknowledges the International Iberian Nanotechnology Laboratory (INL) for a Ph.D. Grant. The authors also acknowledge funding from Fundação de Ciência e Tecnologia (FCT) through the Associated Laboratories IN (Institute of Nanoscience and Nanotechnology) and IBB (Institute of Biotechnology and Bioengineering) and through project PTDC/CTM/104387/2008.
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Martins, D.C., Chu, V., Prazeres, D.M.F. et al. Streaming currents in microfluidics with integrated polarizable electrodes. Microfluid Nanofluid 15, 361–376 (2013). https://doi.org/10.1007/s10404-013-1153-5
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DOI: https://doi.org/10.1007/s10404-013-1153-5