Tuning the preferential direction of ion flow in asymmetric nanofluidic mediums

Document Type : Article

Authors

1 Faculty of Aeronautics and Astronautics, Tarsus University, Mersin, 33400 Turkey

2 Batten College of Engineering and Technology, Old Dominion University, Norfolk, 23529 VA.

Abstract

Current rectification and electrokinetic flow properties in an asymmetric nanochannel in a thermoplastic polyurethane membrane were investigated experimentally and numerically. The nanochannel with a tip diameter of about 300 nm showed current rectification, which is evident only in nanochannels with much smaller tip radii (<100 nm), due to the surface properties of the thermoplastic polyurethane material. To elucidate the mechanism of current rectification, a mathematical model consisting of Nernst - Planck equations for the ionic mass transport, the Poisson’s equation for electrostatics, and Navier – Stokes equations for flow field has been developed. It was verified that the obtained numerical results were in qualitative agreement with the experimental results obtained. It was concluded that due to the surface charge of the channel material, a significantly thick electric double layer was formed on the inner surface of the nanochannel in contact with the electrolyte, and this formed a gating mechanism because of overlapping electric double layers near the tip of the asymmetric nanochannel. It has been found that the applied concentration gradient is as effective as low applied potentials and thus can reverse the preferential direction of ion flow.

Keywords

Main Subjects

References

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Scientia Iranica
Volume 31, Issue 12
Transactions on Nanotechnology (F)
May and June 2024
Pages 920-934

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History

  • Receive Date: 05 December 2021
  • Revise Date: 31 October 2022
  • Accept Date: 18 April 2023

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