Analysis of capillary filling in nanochannels with electroviscous effects

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Analysis of capillary filling in nanochannels with electroviscous effects

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dc.contributor.author Phan, Vinh-Nguyen
dc.contributor.author Yang, Chun
dc.contributor.author Nguyen, Nam-Trung
dc.date.accessioned 2012-05-11T06:28:35Z
dc.date.available 2012-05-11T06:28:35Z
dc.date.copyright 2009
dc.date.issued 2012-05-11
dc.identifier.citation Phan, V. N., Yang, C., & Nguyen, N. T. (2009). Analysis of capillary filling in nanochannels with electroviscous effects. Microfluidics and Nanofluidics, 7(4), 519-530.
dc.identifier.uri http://hdl.handle.net/10220/7869
dc.description.abstract Capillary filling is the key phenomenon in planar chromatography techniques such as paper chromatography and thin layer chromatography. Recent advances in micro/nanotechnologies allow the fabrication of nanoscale structures that can replace the traditional stationary phases such as paper, silica gel, alumina, or cellulose. Thus, understanding capillary filling in a nanochannel helps to advance the development of planar chromatography based on fabricated nanochannels. This paper reports an analysis of the capillary filling process in a nanochannel with consideration of electroviscous effect. In larger scale channels, where the thickness of electrical double layer (EDL) is much smaller than the characteristic length, the formation of the EDL plays an insignificant role in fluid flow. However, in nanochannels, where the EDL thickness is comparable to the characteristic length, its formation contributes to the increase in apparent viscosity of the flow. The results show that the filling process follows the Washburn’s equation, where the filled column is proportional to the square root of time, but with a higher apparent viscosity. It is shown that the electroviscous effect is most significant if the ratio between the channel height (h) and the Debye length (κ −1) reaches an optimum value (i.e. κh ≈ 4). The apparent viscosity is higher with higher zeta potential and lower ion mobility.
dc.format.extent 28 p.
dc.language.iso en
dc.relation.ispartofseries Microfluidics and nanofluidics
dc.rights © 2009 Springer-Verlag. This is the author created version of a work that has been peer reviewed and accepted for publication by Microfluidics and Nanofluidics, Springer-Verlag. 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: DOI: [http://dx.doi.org/10.1007/s10404-009-0410-0].
dc.subject DRNTU::Engineering::Mechanical engineering
dc.title Analysis of capillary filling in nanochannels with electroviscous effects
dc.type Journal Article
dc.contributor.school School of Mechanical and Aerospace Engineering
dc.identifier.doi http://dx.doi.org/10.1007/s10404-009-0410-0
dc.description.version Accepted version
dc.identifier.rims 140769

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