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Cesium-Induced Ionic Conduction through a Single Nanofluidic Pore Modified with Calixcrown Moieties

Ali, Mubarak and Ahmed, Ishtiaq and Ramirez, Patricio and Nasir, Saima and Cervera, Javier and Mafe, Salvador and Niemeyer, Christof M. and Ensinger, Wolfgang :
Cesium-Induced Ionic Conduction through a Single Nanofluidic Pore Modified with Calixcrown Moieties.
[Online-Edition: https://doi.org/10.1021/acs.langmuir.7b02368]
In: Langmuir, 33 (36) pp. 9170-9177. ISSN 0743-7463
[Article] , (2017)

Official URL: https://doi.org/10.1021/acs.langmuir.7b02368

Abstract

We demonstrate experimentally and theoretically a nanofluidic device for the selective recognition of the cesium ion by exploiting host−guest interactions inside confined geometry. For this purpose, a host molecule, i.e., the amine-terminated p-tert-butylcalix[4]arene-crown (t-BuC[4]C−NH2), is successfully synthesized and functionalized on the surface of a single conical nanopore fabricated in a poly(ethylene terephthalate) (PET) membrane through carbodiimide coupling chemistry. On exposure to the cesium cation, the t-BuC[4]C−Cs+ complex is formed through host−guest interaction, leading to the generation of positive fixed charges on the pore surface. The asymmetrical distribution of these groups along the conical nanopore leads to the electrical rectification observed in the current−voltage (I−V) curve. On the contrary, other alkali cations are not able to induce any significant change in the rectification characteristics of the nanopore. The success of the chemical modification is monitored from the changes in the electrical readout of the nanopore. Theoretical results based on the Nernst−Planck and Poisson equations further demonstrate the validity of the experimental approach to the cesium-induced ionic conduction of the nanopore.

Item Type: Article
Erschienen: 2017
Creators: Ali, Mubarak and Ahmed, Ishtiaq and Ramirez, Patricio and Nasir, Saima and Cervera, Javier and Mafe, Salvador and Niemeyer, Christof M. and Ensinger, Wolfgang
Title: Cesium-Induced Ionic Conduction through a Single Nanofluidic Pore Modified with Calixcrown Moieties
Language: English
Abstract:

We demonstrate experimentally and theoretically a nanofluidic device for the selective recognition of the cesium ion by exploiting host−guest interactions inside confined geometry. For this purpose, a host molecule, i.e., the amine-terminated p-tert-butylcalix[4]arene-crown (t-BuC[4]C−NH2), is successfully synthesized and functionalized on the surface of a single conical nanopore fabricated in a poly(ethylene terephthalate) (PET) membrane through carbodiimide coupling chemistry. On exposure to the cesium cation, the t-BuC[4]C−Cs+ complex is formed through host−guest interaction, leading to the generation of positive fixed charges on the pore surface. The asymmetrical distribution of these groups along the conical nanopore leads to the electrical rectification observed in the current−voltage (I−V) curve. On the contrary, other alkali cations are not able to induce any significant change in the rectification characteristics of the nanopore. The success of the chemical modification is monitored from the changes in the electrical readout of the nanopore. Theoretical results based on the Nernst−Planck and Poisson equations further demonstrate the validity of the experimental approach to the cesium-induced ionic conduction of the nanopore.

Journal or Publication Title: Langmuir
Volume: 33
Number: 36
Publisher: American Chemical Society Publications
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: 28 Dec 2017 11:56
DOI: 10.1021/acs.langmuir.7b02368
Official URL: https://doi.org/10.1021/acs.langmuir.7b02368
Funders: M.A., S.N., and W.E. acknowledge funding from the Hessen State Ministry of Higher Education, Research and the Arts, Germany, under LOEWE project iNAPO., P.R., J.C., and S.M. acknowledge financial support by the Spanish Ministry of Economic Affairs and Competitiveness (MAT2015-65011-P) and FEDER., I.A. and C.M.N. acknowledge financial support through the Helmholtz programme BioInterfaces in Technology and Medicine.
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