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

Ali, Mubarak ; Ramirez, Patricio ; Mafé, Salvador ; Neumann, Reinhard ; 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.
[Artikel], (2009)

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

Kurzbeschreibung (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.

Typ des Eintrags: Artikel
Erschienen: 2009
Autor(en): Ali, Mubarak ; Ramirez, Patricio ; Mafé, Salvador ; Neumann, Reinhard ; Ensinger, Wolfgang
Titel: A pH-Tunable Nanofluidic Diode with a Broad Range of Rectifying Properties
Sprache: Englisch
Kurzbeschreibung (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.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: ACS Nano
Band: 3
(Heft-)Nummer: 3
Verlag: ACS Publications
Freie Schlagworte: nanofluidics; nanopore; surface functionalization; amphoteric diode; rectification properties; Poisson−Nernst−Planck equations
Fachbereich(e)/-gebiet(e): Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Materialanalytik
Fachbereich Material- und Geowissenschaften > Materialwissenschaften
Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 15 Jul 2009 12:47
Offizielle URL: http://pubs.acs.org/doi/abs/10.1021/nn900039f
Sponsoren: 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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