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

Ramirez, Patricio ; Manzanares, José A. ; Cervera, Javier ; Gomez, Vicente ; Ali, Mubarak ; Nasir, Saima ; Ensinger, Wolfgang ; 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 ; Manzanares, José A. ; Cervera, Javier ; Gomez, Vicente ; Ali, Mubarak ; Nasir, Saima ; Ensinger, Wolfgang ; 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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