Volume 210, 2018

Unexpected ionic transport behavior in hydrophobic and uncharged conical nanopores

Abstract

We investigated ionic transport behavior in the case of uncharged conical nanopores. To do so, we designed conical nanopores using atomic layer deposition of Al2O3/ZnO nanolaminates and then coated these with trimethylsilane. The experimental results are supported by molecular dynamics simulations. The ionic transport reveals an unexpected behavior: (i) a current rectification and (ii) a constant conductance at low salt concentration which are usually reported for charged conical nanopore. To explain these results, we have considered different assumptions: (i) a default of functionalization, (ii) the adsorption anion and (iii) the slippage. The first one was refuted by the study of the poly-L-lysine transport through the nanopore. To verify the second assumption, we investigate the effect of pH on the current rectification and the molecular dynamics simulations. Finally our study demonstrates that the unexpected ionic transport is provided to a predominant effect of slippage due to the water organization at the solid/liquid interface.

Graphical abstract: Unexpected ionic transport behavior in hydrophobic and uncharged conical nanopores

Associated articles

Article information

Article type
Paper
Submitted
30 ม.ค. 2561
Accepted
26 ก.พ. 2561
First published
26 ก.พ. 2561

Faraday Discuss., 2018,210, 69-85

Unexpected ionic transport behavior in hydrophobic and uncharged conical nanopores

S. Balme, F. Picaud, M. Lepoitevin, M. Bechelany, E. Balanzat and J. Janot, Faraday Discuss., 2018, 210, 69 DOI: 10.1039/C8FD00008E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements