Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/83063
Title: Electroosmotic Flow Hysteresis for Dissimilar Anionic Solutions
Authors: Lim, An Eng
Lim, Chun Yee
Lam, Yee Cheong
Keywords: Finite element method
Electrolytes
Issue Date: 2016
Source: Lim, A. E., Lim, C. Y., & Lam, Y. C. (2016). Electroosmotic Flow Hysteresis for Dissimilar Anionic Solutions. Analytical Chemistry, 88(16), 8064-8073.
Series/Report no.: Analytical Chemistry
Abstract: Electroosmotic flow (EOF) with two or more fluids is often encountered in various microfluidic applications. However, no investigation has hitherto been conducted to investigate the hysteretic or flow direction-dependent behavior during displacement flow of solutions with dissimilar anion species. In this investigation, EOF of dissimilar anionic solutions was studied experimentally through the current monitoring method and numerically through finite element simulations. As opposed to other conventional displacement flows, EOF involving dissimilar anionic solutions exhibits counterintuitive behavior, whereby the current–time curve does not reach the steady-state value of the displacing electrolyte. Two distinct mechanics have been identified as the causes for this observation: (a) ion concentration adjustment when the displacing anions migrate upstream against EOF due to competition between the gradients of electromigrative and convective fluxes and (b) ion concentration readjustment induced by the static diffusive interfacial region between the dissimilar fluids which can only be propagated throughout the entire microchannel with the presence of EOF. The resultant ion distributions lead to the flow rate to be directional-dependent, indicating that the flow conditions are asymmetric between these two different flow directions. The outcomes of this investigation contribute to the in-depth understanding of flow behavior in microfluidic systems involving inhomogeneous fluids, particularly dissimilar anionic solutions. The understanding of EOF hysteresis is fundamentally important for the accurate prediction of analytes transport in microfluidic devices under EOF.
URI: https://hdl.handle.net/10356/83063
http://hdl.handle.net/10220/42418
ISSN: 0003-2700
DOI: 10.1021/acs.analchem.6b01536
Rights: © 2016 American Chemical Society. This is the author created version of a work that has been peer reviewed and accepted for publication by Analytical Chemistry, American Chemical Society. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1021/acs.analchem.6b01536].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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