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Nanoparticle-induced rectification in a single cylindrical nanopore: Net currents from zero time-average potentials

Ali, Mubarak and Ramirez, Patricio and Nasir, Saima and Nguyen, Quoc-Hung and Ensinger, Wolfgang and Mafe, Salvador (2014):
Nanoparticle-induced rectification in a single cylindrical nanopore: Net currents from zero time-average potentials.
In: Applied Physics Letters, AIP Publishing , pp. 043703, 104, (4), ISSN 0003-6951, [Online-Edition: http://dx.doi.org/10.1063/1.4863511],
[Article]

Abstract

Rectification in nanopores is usually achieved by a fixed asymmetry in the pore geometry and charge distribution. We show here that nanoparticle blocking of a cylindrical pore induces rectifying properties that can support significant net currents with zero time-average potentials. To describe experimentally this effect, the steady-state current-voltage curves of a single nanopore are obtained for different charge states and relative sizes of the pore and the charged nanoparticles, which are present only on one side. The rectification phenomena observed can find applications in the area of nanofluidics and involves physical concepts that are also characteristic of the blocking of protein ion channels by ionic drugs.

Item Type: Article
Erschienen: 2014
Creators: Ali, Mubarak and Ramirez, Patricio and Nasir, Saima and Nguyen, Quoc-Hung and Ensinger, Wolfgang and Mafe, Salvador
Title: Nanoparticle-induced rectification in a single cylindrical nanopore: Net currents from zero time-average potentials
Language: English
Abstract:

Rectification in nanopores is usually achieved by a fixed asymmetry in the pore geometry and charge distribution. We show here that nanoparticle blocking of a cylindrical pore induces rectifying properties that can support significant net currents with zero time-average potentials. To describe experimentally this effect, the steady-state current-voltage curves of a single nanopore are obtained for different charge states and relative sizes of the pore and the charged nanoparticles, which are present only on one side. The rectification phenomena observed can find applications in the area of nanofluidics and involves physical concepts that are also characteristic of the blocking of protein ion channels by ionic drugs.

Journal or Publication Title: Applied Physics Letters
Volume: 104
Number: 4
Publisher: AIP Publishing
Uncontrolled Keywords: Nanoparticles, Rectification, Nanoporous materials, Charged currents, Ion channels, Electroosmosis, Nanofluidics, Electrolytes, Electrical properties, Electrostatics
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 31 Jan 2014 09:50
Official URL: http://dx.doi.org/10.1063/1.4863511
Identification Number: doi:10.1063/1.4863511
Funders: M.A., S.N., Q.H.N., and W.E. acknowledge the Beilstein-Institut, Frankfurt/Main, Germany, within the research collaboration NanoBiC. , P.R. and S.M. acknowledge the Ministry of Economy and Competitiveness (project MAT2012-32084) and the Generalitat Valenciana (project PROMETEO/GV/0069).
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