Ali, Mubarak ; Ramirez, Patricio ; Mafé, Salvador ; Neumann, Reinhard ; Ensinger, Wolfgang (2009)
A pH-Tunable Nanofluidic Diode with a Broad Range of Rectifying Properties.
In: ACS Nano, 3 (3)
Artikel, Bibliographie
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 |
| Art des Eintrags: | Bibliographie |
| Titel: | A pH-Tunable Nanofluidic Diode with a Broad Range of Rectifying Properties |
| Sprache: | Englisch |
| Publikationsjahr: | 24 März 2009 |
| Verlag: | ACS Publications |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | ACS Nano |
| Jahrgang/Volume einer Zeitschrift: | 3 |
| (Heft-)Nummer: | 3 |
| URL / URN: | 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. |
| Freie Schlagworte: | nanofluidics; nanopore; surface functionalization; amphoteric diode; rectification properties; Poisson−Nernst−Planck equations |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Materialanalytik 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 15 Jul 2009 12:47 |
| Letzte Änderung: | 05 Mär 2013 09:20 |
| PPN: | |
| 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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