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 जनवरी 2018
Accepted
26 फरवरी 2018
First published
26 फरवरी 2018

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

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