Temperature effects on the electrohydrodynamic and electrokinetic behaviour of ion-selective nanochannels

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Abstract

A non-isothermal formulation of the Poisson–Nernst–Planck with Navier–Stokes equations is used to study the influence of heating effects in the form of Joule heating and viscous dissipation and imposed temperature gradients on a microchannel/nanochannel system. The system is solved numerically under various cases in order to determine the influence of temperature-related effects on ion-selectivity, flux and fluid flow profiles, as well as coupling between these phenomena. It is demonstrated that for a larger reservoir system, the effects of Joule heating and viscous dissipation only become relevant for higher salt concentrations and electric field strengths than are compatible with ion-selectivity due to Debye layer overlap. More interestingly, it is shown that using different temperature reservoirs can have a strong influence on ion-selectivity, as well as the induced electrohydrodynamic flows.
Original languageEnglish
Article number114002
Pages (from-to)114002-
JournalJournal of physics: Condensed matter
Volume28
Issue number11
DOIs
Publication statusPublished - 2016

Keywords

  • METIS-316073
  • IR-99592

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