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Ionic transport characteristics of negatively and positively charged conical nanopores in 1:1, 2:1, 3:1, 2:2, 1:2, and 1:3 electrolytes

Nasir, Saima and Ali, Mubarak and Cervera, Javier and Gomez, Vicente and Hamza Ali Haider, M. and Ensinger, Wolfgang and Mafe, Salvador and Ramirez, Patricio (2019):
Ionic transport characteristics of negatively and positively charged conical nanopores in 1:1, 2:1, 3:1, 2:2, 1:2, and 1:3 electrolytes.
553, In: Journal of Colloid and Interface Science, 2019, pp. 639-646. Elsevier B.V., ISSN 00219797,
DOI: 10.1016/j.jcis.2019.06.061,
[Article]

Abstract

We study experimentally the current (I)-voltage (V) curves of 1:1, 2:1, 3:1, 2:2, 1:2, and 1:3 electrolytes in positively and negatively charged conically-shaped pores of nanoscale dimensions. The positive charges are poly(allylamine hydrochloride) chains functionalized on the pore surface by electrostatic interactions while the negative charges are carboxylic acid groups. Under physiological conditions, these fixed-charge groups are ionized and strongly interact with the different monovalent, divalent, and trivalent ions in the pore solution. The current rectification of the I-V curves and the membrane potentials provide fundamental information on the interaction of the pore charge groups with the mobile ions present at electrochemically and biologically relevant concentrations. The different pores and electrolytes studied, together with the abundant experimental data provided, can be useful to develop new theoretical simulations of transport phenomena in nanoscale solutions that are confined within charged surfaces.

Item Type: Article
Erschienen: 2019
Creators: Nasir, Saima and Ali, Mubarak and Cervera, Javier and Gomez, Vicente and Hamza Ali Haider, M. and Ensinger, Wolfgang and Mafe, Salvador and Ramirez, Patricio
Title: Ionic transport characteristics of negatively and positively charged conical nanopores in 1:1, 2:1, 3:1, 2:2, 1:2, and 1:3 electrolytes
Language: English
Abstract:

We study experimentally the current (I)-voltage (V) curves of 1:1, 2:1, 3:1, 2:2, 1:2, and 1:3 electrolytes in positively and negatively charged conically-shaped pores of nanoscale dimensions. The positive charges are poly(allylamine hydrochloride) chains functionalized on the pore surface by electrostatic interactions while the negative charges are carboxylic acid groups. Under physiological conditions, these fixed-charge groups are ionized and strongly interact with the different monovalent, divalent, and trivalent ions in the pore solution. The current rectification of the I-V curves and the membrane potentials provide fundamental information on the interaction of the pore charge groups with the mobile ions present at electrochemically and biologically relevant concentrations. The different pores and electrolytes studied, together with the abundant experimental data provided, can be useful to develop new theoretical simulations of transport phenomena in nanoscale solutions that are confined within charged surfaces.

Journal or Publication Title: Journal of Colloid and Interface Science
Volume: 553
Journal volume: 2019
Publisher: Elsevier B.V.
Uncontrolled Keywords: Charged conical nanopore, Current-voltage curve, Current rectification, Asymmetric electrolytes, Charge number effects, Membrane potential
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 10:05
DOI: 10.1016/j.jcis.2019.06.061
Official URL: https://doi.org/10.1016/j.jcis.2019.06.061
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