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Size‐Based Cationic Molecular Sieving through Solid‐State Nanochannels

Ali, Mubarak ; Nasir, Saima ; Froehlich, Kristina ; Ramirez, Patricio ; Cervera, Javier ; Mafe, Salvador ; Ensinger, Wolfgang (2023)
Size‐Based Cationic Molecular Sieving through Solid‐State Nanochannels.
In: Advanced Materials Interfaces, 2021, 8 (6)
doi: 10.26083/tuprints-00020146
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Item Type: Article
Type of entry: Secondary publication
Title: Size‐Based Cationic Molecular Sieving through Solid‐State Nanochannels
Language: English
Date: 22 December 2023
Place of Publication: Darmstadt
Year of primary publication: 2021
Place of primary publication: Weinheim
Publisher: Wiley-VCH
Journal or Publication Title: Advanced Materials Interfaces
Volume of the journal: 8
Issue Number: 6
Collation: 10 Seiten
DOI: 10.26083/tuprints-00020146
Corresponding Links:
Origin: Secondary publication DeepGreen

The molecular sieving behavior of soft‐etched polyimide membranes having negatively charged nanochannels is described experimentally and theoretically using alkali metal–crown ether cationic complexes and alkylammonium cations. To this end, the electrical conduction and current rectification obtained with different alkali electrolyte solutions (LiCl, NaCl, and KCl) and crown ether molecules (12‐crown‐4, 15‐crown‐5, and 18‐crown‐6) are studied. The results suggest that only the [Li(12C4)]⁺ complex can readily permeate through the nanochannels because significant current decreases are obtained in the cases of the [Na(15C5)]⁺ and [K(18C6)]⁺ complexes. In solutions of organic cations ranging from ammonium (NH₄⁺) to alkylammonium (R₄N⁺) with increasing molecular size, only the smaller ions can conduct high electric currents, suggesting again that the membrane channels are in the nanometer range. Taken together, the observed current decreases and rectification phenomena demonstrate that the functionalized membranes allow a versatile combination of molecular and electrostatic sieving.

Uncontrolled Keywords: alkylammonium cations, ionic conduction, metal ion‐crown ether complexes, molecular sieving, polyimide membranes
Identification Number: 2001766
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-201460
Classification DDC: 500 Science and mathematics > 540 Chemistry
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Material Analytics
Interdisziplinäre Forschungsprojekte > Centre for Synthetic Biology
Date Deposited: 22 Dec 2023 13:25
Last Modified: 07 Mar 2024 09:57
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20146
PPN: 516052977
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