Electroviscous effects in nanofluidic channels

Moran Wang, Chi Chang Chang, Ruey Jen Yang

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

This paper presents a systematical study of electroviscous effects in nanofluidic channels using a triple layer model and a numerical framework. A chemical dissociation layer is introduced at solid-liquid interfaces to bridge the surface charge condition with the local properties of both solid surfaces and the ionic liquid. The electrokinetic transport in the electrical double layers is modeled by a lattice Poisson-Boltzmann method. The results indicate that there is an ionic concentration leading to the maximum electroviscosity for a given channel height, pH value, and environmental temperature. For a very high ionic concentration, a smaller channel height leads to a higher electroviscosity. When the bulk concentration reduces from 10-3M to 10-6M, there is a critical channel height that maximizes the electroviscosity for a given ionic concentration, and the critical height increases with the decreasing ionic concentration. The electroviscosity increases with the pH of electrolyte solutions and is nearly proportional to the environmental temperature. The present study may help to improve the understanding of electrokinetic transport in nanofluidic channels.

Original languageEnglish
Article number024701
JournalJournal of Chemical Physics
Volume132
Issue number2
DOIs
Publication statusPublished - 2010 Jan 25

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Nanofluidics
Ionic Liquids
Surface charge
Electrolytes
electrokinetics
ambient temperature
Temperature
Liquids
liquid-solid interfaces
solid surfaces
electrolytes
dissociation
liquids

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Wang, Moran ; Chang, Chi Chang ; Yang, Ruey Jen. / Electroviscous effects in nanofluidic channels. In: Journal of Chemical Physics. 2010 ; Vol. 132, No. 2.
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Electroviscous effects in nanofluidic channels. / Wang, Moran; Chang, Chi Chang; Yang, Ruey Jen.

In: Journal of Chemical Physics, Vol. 132, No. 2, 024701, 25.01.2010.

Research output: Contribution to journalArticle

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