Transient response of nonideal ion-selective microchannel-nanochannel devices

Neta Leibowitz, Jarrod Schiffbauer, Sinwook Park, and Gilad Yossifon
Phys. Rev. E 97, 043104 – Published 5 April 2018
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Abstract

We report evidence of variation in ion selectivity of a fabricated microchannel-nanochannel device resulting in the appearance of a distinct local maximum in the overlimiting chronopotentiometric response. In this system consisting of shallow microchannels joined by a nanochannel, viscous shear at the microchannel walls suppresses the electro-osmotic instability and prevents any associated contribution to the nonmonotonic response. Thus, this response is primarily electrodiffusive. Numerical simulations indicate that concentration polarization develops not only within the microchannel but also within the nanochannel itself, with a local voltage maximum in the chronopotentiometric response correlated with interfacial depletion and having the classic i2 Sands time dependence. Furthermore, the occurrence of the local maxima is correlated with the change in selectivity due to internal concentration polarization. Understanding the transient nonideal permselective response is essential for obtaining fundamental insight and for optimizing efficient operation of practical fabricated nanofluidic and membrane devices.

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  • Received 18 February 2018

DOI:https://doi.org/10.1103/PhysRevE.97.043104

©2018 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Fluid Dynamics

Authors & Affiliations

Neta Leibowitz1, Jarrod Schiffbauer2, Sinwook Park1, and Gilad Yossifon1,*

  • 1Faculty of Mechanical Engineering, Micro- and Nanofluidics Laboratory, Technion-Israel Institute of Technology, Technion City 32000, Israel
  • 2Physical and Environmental Sciences, Colorado Mesa University, Grand Junction, Colorado 81501, USA

  • *Corresponding author: yossifon@technion.ac.il

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Issue

Vol. 97, Iss. 4 — April 2018

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