We describe the fabrication of asymmetric nanopores sensitive to ultraviolet (UV) light, and give a detailed account of the divalent ionic transport through these pores using a theoretical model based on the Nernst-Planck equations. The pore surface is decorated with lysine chains having pH-sensitive (amine and carboxylic acid) moieties that are caged with photo-labile 4,5-dimethoxy-2-nitrobenzyl (NVOC) groups. The uncharged hydrophobic NVOC groups are removed using UV irradiation, leading to the generation of hydrophilic “uncaged” amphoteric groups on the pore surface. We demonstrate experimentally that polymer membranes containing single pore and arrays of asymmetric nanopores can be employed for the pH-controlled transport of ionic and molecular analytes. Comparison between theory and experiment allows for understanding the individual properties of the phototriggered nanopores, and provides also useful clues for the design and fabrication of multipore membranes to be used in practical applications.
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21 January 2013
Research Article|
January 18 2013
Nernst-Planck model of photo-triggered, pH–tunable ionic transport through nanopores functionalized with “caged” lysine chains
Saima Nasir;
Saima Nasir
1Department of Material- and Geo-Sciences, Materials Analysis,
Technische Universität Darmstadt
, D-64287 Darmstadt, Germany
2
Materials Research Department
, GSI Helmholtzzentrum für Schwerionenforschung, Planckstrasse 1, D-64291, Darmstadt, Germany
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Patricio Ramirez;
Patricio Ramirez
3Dept. de Física Aplicada,
Univ. Politècnica de València
, Camino de Vera s/n, E-46022 Valencia, Spain
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Mubarak Ali;
Mubarak Ali
a)
1Department of Material- and Geo-Sciences, Materials Analysis,
Technische Universität Darmstadt
, D-64287 Darmstadt, Germany
2
Materials Research Department
, GSI Helmholtzzentrum für Schwerionenforschung, Planckstrasse 1, D-64291, Darmstadt, Germany
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Ishtiaq Ahmed;
Ishtiaq Ahmed
4
Karlsruher Institute of Technology
, DFG-Center for Functional Nanostructures, Wolfgang-Gaede-Strasse 1, D-76131 Karlsruhe, Germany
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Ljiljana Fruk;
Ljiljana Fruk
4
Karlsruher Institute of Technology
, DFG-Center for Functional Nanostructures, Wolfgang-Gaede-Strasse 1, D-76131 Karlsruhe, Germany
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Salvador Mafe;
Salvador Mafe
5Dept. de Física de la Terra i Termodinàmica,
Universitat de València
, E-46100 Burjassot, Spain
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Wolfgang Ensinger
Wolfgang Ensinger
1Department of Material- and Geo-Sciences, Materials Analysis,
Technische Universität Darmstadt
, D-64287 Darmstadt, Germany
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a)
Author to whom correspondence should be addressed. Electronic addresses: [email protected] and [email protected]
J. Chem. Phys. 138, 034709 (2013)
Article history
Received:
November 13 2012
Accepted:
December 30 2012
Citation
Saima Nasir, Patricio Ramirez, Mubarak Ali, Ishtiaq Ahmed, Ljiljana Fruk, Salvador Mafe, Wolfgang Ensinger; Nernst-Planck model of photo-triggered, pH–tunable ionic transport through nanopores functionalized with “caged” lysine chains. J. Chem. Phys. 21 January 2013; 138 (3): 034709. https://doi.org/10.1063/1.4775811
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