Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/159402
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dc.contributor.authorLim, An Engen_US
dc.contributor.authorLam, Yee Cheongen_US
dc.date.accessioned2022-06-16T01:28:25Z-
dc.date.available2022-06-16T01:28:25Z-
dc.date.issued2021-
dc.identifier.citationLim, A. E. & Lam, Y. C. (2021). Electroosmotic flow hysteresis for fluids with dissimilar pH and ionic species. Micromachines, 12(9), 1031-. https://dx.doi.org/10.3390/mi12091031en_US
dc.identifier.issn2072-666Xen_US
dc.identifier.urihttps://hdl.handle.net/10356/159402-
dc.description.abstractElectroosmotic flow (EOF) involving displacement of multiple fluids is employed in micro-/nanofluidic applications. There are existing investigations on EOF hysteresis, i.e., flow direction-dependent behavior. However, none so far have studied the solution pair system of dissimilar ionic species with substantial pH difference. They exhibit complicated hysteretic phenomena. In this study, we investigate the EOF of sodium bicarbonate (NaHCO3, alkaline) and sodium chloride (NaCl, slightly acidic) solution pair via current monitoring technique. A developed slip velocity model with a modified wall condition is implemented with finite element simulations. Quantitative agreements between experimental and simulation results are obtained. Concentration evolutions of NaHCO3-NaCl follow the dissimilar anion species system. When NaCl displaces NaHCO3, EOF reduces due to the displacement of NaHCO3 with high pH (high absolute zeta potential). Consequently, NaCl is not fully displaced into the microchannel. When NaHCO3 displaces NaCl, NaHCO3 cannot displace into the microchannel as NaCl with low pH (low absolute zeta potential) produces slow EOF. These behaviors are independent of the applied electric field. However, complete displacement tends to be achieved by lowering the NaCl concentration, i.e., increasing its zeta potential. In contrast, the NaHCO3 concentration has little impact on the displacement process. These findings enhance the understanding of EOF involving solutions with dissimilar pH and ion species.en_US
dc.description.sponsorshipNanyang Technological Universityen_US
dc.language.isoenen_US
dc.relation001274-00001en_US
dc.relation.ispartofMicromachinesen_US
dc.rights© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).en_US
dc.subjectEngineering::Mechanical engineeringen_US
dc.titleElectroosmotic flow hysteresis for fluids with dissimilar pH and ionic speciesen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.identifier.doi10.3390/mi12091031-
dc.description.versionPublished versionen_US
dc.identifier.pmid34577675-
dc.identifier.scopus2-s2.0-85114374987-
dc.identifier.issue9en_US
dc.identifier.volume12en_US
dc.identifier.spage1031en_US
dc.subject.keywordsElectrokinetic Phenomenaen_US
dc.subject.keywordsMicro-/Nanofluidicsen_US
dc.description.acknowledgementThe research work was supported by Nanyang Technological University (NTU) with Grant No. 001274-00001.en_US
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