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Nernst-Planck model of photo-triggered, pH-tunable ionic transport through nanopores functionalized with "caged" lysine chains

Nasir, Saima and Ramirez, Patricio and Ali, Mubarak and Ahmed, Ishtiaq and Fruk, Ljiljana and Mafe, Salvador and Ensinger, Wolfgang (2013):
Nernst-Planck model of photo-triggered, pH-tunable ionic transport through nanopores functionalized with "caged" lysine chains.
In: The Journal of Chemical Physics, 138 (3), American Institute of Physics, pp. 034709-034709, ISSN 0021-9606,
[Online-Edition: http://jcp.aip.org/resource/1/jcpsa6/v138/i3/p034709s1],
[Article]

Abstract

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.

Item Type: Article
Erschienen: 2013
Creators: Nasir, Saima and Ramirez, Patricio and Ali, Mubarak and Ahmed, Ishtiaq and Fruk, Ljiljana and Mafe, Salvador and Ensinger, Wolfgang
Title: Nernst-Planck model of photo-triggered, pH-tunable ionic transport through nanopores functionalized with "caged" lysine chains
Language: English
Abstract:

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.

Journal or Publication Title: The Journal of Chemical Physics
Volume: 138
Number: 3
Publisher: American Institute of Physics
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: 21 Jan 2013 13:07
Official URL: http://jcp.aip.org/resource/1/jcpsa6/v138/i3/p034709s1
Identification Number: doi:10.1063/1.4775811
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