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A pH-Tunable Nanofluidic Diode with a Broad Range of Rectifying Properties

Ali, Mubarak and Ramirez, Patricio and Mafé, Salvador and Neumann, Reinhard and Ensinger, Wolfgang :
A pH-Tunable Nanofluidic Diode with a Broad Range of Rectifying Properties.
[Online-Edition: http://pubs.acs.org/doi/abs/10.1021/nn900039f]
In: ACS Nano, 3 (3) pp. 603-608.
[Article] , (2009)

Official URL: http://pubs.acs.org/doi/abs/10.1021/nn900039f

Abstract

The use of fixed charge nanopores in practical applications requires tuning externally the electrostatic interaction between the charged groups and the ionic permeants in order to allow integrating a variety of functions on the same nanostructure. We design, produce, and characterize, theoretically and experimentally, a single-track amphoteric nanopore functionalized with lysine and histidine chains whose positive and negative charges are very sensitive to the external pH. This nanofluidic diode with amphoteric chains attached to the pore surface allows for a broad set of rectification properties supported by a single nanodevice. A definite plus is to functionalize these groups on a conical nanopore with well-defined, controlled structural asymmetry which gives virtually every rectification characteristic that may be required in practical applications. Nanometer-scaled amphoteric pores are of general interest because of the potential applications in drug delivery systems, ion-exchange membranes for separation of biomacromolecules, antifouling materials with reduced molecular adsorption, and biochemical sensors.

Item Type: Article
Erschienen: 2009
Creators: Ali, Mubarak and Ramirez, Patricio and Mafé, Salvador and Neumann, Reinhard and Ensinger, Wolfgang
Title: A pH-Tunable Nanofluidic Diode with a Broad Range of Rectifying Properties
Language: English
Abstract:

The use of fixed charge nanopores in practical applications requires tuning externally the electrostatic interaction between the charged groups and the ionic permeants in order to allow integrating a variety of functions on the same nanostructure. We design, produce, and characterize, theoretically and experimentally, a single-track amphoteric nanopore functionalized with lysine and histidine chains whose positive and negative charges are very sensitive to the external pH. This nanofluidic diode with amphoteric chains attached to the pore surface allows for a broad set of rectification properties supported by a single nanodevice. A definite plus is to functionalize these groups on a conical nanopore with well-defined, controlled structural asymmetry which gives virtually every rectification characteristic that may be required in practical applications. Nanometer-scaled amphoteric pores are of general interest because of the potential applications in drug delivery systems, ion-exchange membranes for separation of biomacromolecules, antifouling materials with reduced molecular adsorption, and biochemical sensors.

Journal or Publication Title: ACS Nano
Volume: 3
Number: 3
Publisher: ACS Publications
Uncontrolled Keywords: nanofluidics; nanopore; surface functionalization; amphoteric diode; rectification properties; Poisson−Nernst−Planck equations
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: 15 Jul 2009 12:47
Official URL: http://pubs.acs.org/doi/abs/10.1021/nn900039f
Funders: M.A. thanks HEC of Pakistan, on receiving partial financial support. P.R. and S.M. acknowledge the support from Ministry of Science and Innovation of Spain, Program of Materials, and FEDER.
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