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Controlling ionic current through a nanopore by tuning pH: a local equilibrium Monte Carlo study

Fertig, Dávid and Valiskó, Mónika and Boda, Dezső (2019) Controlling ionic current through a nanopore by tuning pH: a local equilibrium Monte Carlo study. Molecular Physics, 117 (20). pp. 2793-2801. ISSN 0026-8976, ESSN: 1362-3028

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Abstract

The purpose of this work is to create a model of a nanofluidic transistor which is able to mimic the effects of pH on nanopore conductance. The pH of the electrolyte is an experimentally controllable parameter through which the charge pattern can be tuned: pH affects the ratio of the protonated/deprotonated forms of the functional groups anchored to the surface of the nanopore (for example, amino and carboxyl groups). Thus, the behaviour of the bipolar transistor changes as it becomes ion selective in acidic/basic environments. We relate the surface charge to pH and perform particle simulations (Local Equilibrium Monte Carlo) with different nanopore geometries (cylindrical and double conical). The simulations form a self consistent system with the Nernst–Planck equation with which we compute ionic flux. We discuss the mechanism behind pH-control of ionic current: formation of depletion zones.

Item Type: Article
Subjects: Q Science / természettudomány > QC Physics / fizika > QC06 Physics of condensed matter / szilárdtestfizika
Q Science / természettudomány > QD Chemistry / kémia > QD02 Physical chemistry / fizikai kémia
Depositing User: Professor Dezső Boda
Date Deposited: 08 Nov 2019 09:51
Last Modified: 08 Nov 2019 09:51
URI: http://real.mtak.hu/id/eprint/103080

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