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Rectification properties of conically shaped nanopores: consequences of miniaturization

Pietschmann, J.-F. and Wolfram, M.-T. and Burger, M. and Trautmann, C. and Nguyen, G. and Pevarnik, M. and Bayer, V. and Siwy, Z. (2013):
Rectification properties of conically shaped nanopores: consequences of miniaturization.
In: Physical Chemistry Chemical Physics, Royal Society of Chemistry Publishing, p. 16917, 15, (39), ISSN 1463-9076, [Online-Edition: http://dx.doi.org/10.1039/C3CP53105H],
[Article]

Abstract

Nanopores attracted a great deal of scientific interest as templates for biological sensors as well as model systems to understand transport phenomena at the nanoscale. The experimental and theoretical analysis of nanopores has been so far focused on understanding the effect of the pore opening diameter on ionic transport. In this article we present systematic studies on the dependence of ion transport properties on the pore length. Particular attention was given to the effect of ion current rectification exhibited in conically shaped nanopores with homogeneous surface charges. We found that reducing the length of conically shaped nanopores significantly lowered their ability to rectify ion current. However, rectification properties of short pores can be enhanced by tailoring the surface charge and the shape of the narrow opening. Furthermore we analyzed the relationship of the rectification behavior and ion selectivity for different pore lengths. All simulations were performed using MsSimPore, a software package for solving the Poisson–Nernst–Planck (PNP) equations. It is based on a novel finite element solver and allows for simulations up to surface charge densities of −2 e per nm2. MsSimPore is based on 1D reduction of the PNP model, but allows for a direct treatment of the pore with bulk electrolyte reservoirs, a feature which was previously used in higher dimensional models only. MsSimPore includes these reservoirs in the calculations, a property especially important for short pores, where the ionic concentrations and the electric potential vary strongly inside the pore as well as in the regions next to the pore entrance.

Item Type: Article
Erschienen: 2013
Creators: Pietschmann, J.-F. and Wolfram, M.-T. and Burger, M. and Trautmann, C. and Nguyen, G. and Pevarnik, M. and Bayer, V. and Siwy, Z.
Title: Rectification properties of conically shaped nanopores: consequences of miniaturization
Language: English
Abstract:

Nanopores attracted a great deal of scientific interest as templates for biological sensors as well as model systems to understand transport phenomena at the nanoscale. The experimental and theoretical analysis of nanopores has been so far focused on understanding the effect of the pore opening diameter on ionic transport. In this article we present systematic studies on the dependence of ion transport properties on the pore length. Particular attention was given to the effect of ion current rectification exhibited in conically shaped nanopores with homogeneous surface charges. We found that reducing the length of conically shaped nanopores significantly lowered their ability to rectify ion current. However, rectification properties of short pores can be enhanced by tailoring the surface charge and the shape of the narrow opening. Furthermore we analyzed the relationship of the rectification behavior and ion selectivity for different pore lengths. All simulations were performed using MsSimPore, a software package for solving the Poisson–Nernst–Planck (PNP) equations. It is based on a novel finite element solver and allows for simulations up to surface charge densities of −2 e per nm2. MsSimPore is based on 1D reduction of the PNP model, but allows for a direct treatment of the pore with bulk electrolyte reservoirs, a feature which was previously used in higher dimensional models only. MsSimPore includes these reservoirs in the calculations, a property especially important for short pores, where the ionic concentrations and the electric potential vary strongly inside the pore as well as in the regions next to the pore entrance.

Journal or Publication Title: Physical Chemistry Chemical Physics
Volume: 15
Number: 39
Publisher: Royal Society of Chemistry Publishing
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Ion-Beam-Modified Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 21 Mar 2014 12:56
Official URL: http://dx.doi.org/10.1039/C3CP53105H
Identification Number: doi:10.1039/C3CP53105H
Funders: MB and VB acknowledge financial support from Volkswagen Stiftung via the grant Multi-scale simulation of ion transport through biological and synthetic channels . , MTW acknowledges financial support of the Austrian Science Foundation FWF via the Hertha Firnberg Project T456-N23. , JFP acknowledges support from the DFG via grant PI 1073/1-1, the German academic exchange service (DAAD) via project 56052884 and the Daimler and Benz fundation via a PostDoc stipend. , ZS recognizes the support from the National Science Foundation CHE 1306058.
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