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Surface charge regulation of functionalized conical nanopore conductance by divalent cations and anions

Ramirez, Patricio and Manzanares, José A. and Cervera, Javier and Gomez, Vicente and Ali, Mubarak and Nasir, Saima and Ensinger, Wolfgang and Mafe, Salvador (2019):
Surface charge regulation of functionalized conical nanopore conductance by divalent cations and anions.
In: Electrochimica Acta, 325, p. 134914. Elsevier Ltd., ISSN 00134686,
DOI: 10.1016/j.electacta.2019.134914,
[Article]

Abstract

The surface charge regulation in nanoscale volumes is a subject of wide interest to biological and chemical soft matter systems. Also, electrolyte mixtures with monovalent and divalent ions are commonplace in practical applications with micro and nanoporous ion-exchange membranes. We have studied experimentally and theoretically the conductance of conical nanopores functionalized with negative and positive surface charges that are bathed by electrolyte mixtures of the monovalent ions K+ and Cl− and the divalent ions Mg2+, Ba2+, Ca2+, and SO42−. Small concentrations of these ions can modulate the nanopore selectivity and conductance because of their interaction with the charged groups on the pore surface. We have also given a qualitative description of the surface charge regulation using a simplified model for multivalent ion mixtures.

Item Type: Article
Erschienen: 2019
Creators: Ramirez, Patricio and Manzanares, José A. and Cervera, Javier and Gomez, Vicente and Ali, Mubarak and Nasir, Saima and Ensinger, Wolfgang and Mafe, Salvador
Title: Surface charge regulation of functionalized conical nanopore conductance by divalent cations and anions
Language: English
Abstract:

The surface charge regulation in nanoscale volumes is a subject of wide interest to biological and chemical soft matter systems. Also, electrolyte mixtures with monovalent and divalent ions are commonplace in practical applications with micro and nanoporous ion-exchange membranes. We have studied experimentally and theoretically the conductance of conical nanopores functionalized with negative and positive surface charges that are bathed by electrolyte mixtures of the monovalent ions K+ and Cl− and the divalent ions Mg2+, Ba2+, Ca2+, and SO42−. Small concentrations of these ions can modulate the nanopore selectivity and conductance because of their interaction with the charged groups on the pore surface. We have also given a qualitative description of the surface charge regulation using a simplified model for multivalent ion mixtures.

Journal or Publication Title: Electrochimica Acta
Journal volume: 325
Publisher: Elsevier Ltd.
Uncontrolled Keywords: Functionalized conical nanopore, Conductance minima, Surface charge regulation, Divalent ions
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Material Analytics
Date Deposited: 14 Feb 2020 10:21
DOI: 10.1016/j.electacta.2019.134914
Official URL: https://doi.org/10.1016/j.electacta.2019.134914
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