Nasir, Saima ; Ramirez, Patricio ; Ali, Mubarak ; Ahmed, Ishtiaq ; Fruk, Ljiljana ; Mafe, Salvador ; 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)
doi: 10.1063/1.4775811
Article, Bibliographie
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 ; Ramirez, Patricio ; Ali, Mubarak ; Ahmed, Ishtiaq ; Fruk, Ljiljana ; Mafe, Salvador ; Ensinger, Wolfgang |
| Type of entry: | Bibliographie |
| Title: | Nernst-Planck model of photo-triggered, pH-tunable ionic transport through nanopores functionalized with "caged" lysine chains |
| Language: | English |
| Date: | January 2013 |
| Publisher: | American Institute of Physics |
| Journal or Publication Title: | The Journal of Chemical Physics |
| Volume of the journal: | 138 |
| Issue Number: | 3 |
| DOI: | 10.1063/1.4775811 |
| 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. |
| 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 |
| Last Modified: | 05 Mar 2013 10:04 |
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