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Influence of Wettability on the Impedance of Ion Transport Through Mesoporous Silica Films

Ochs, Maria ; Khalil, Adnan ; Frömling, Till ; Andrieu‐Brunsen, Annette (2021):
Influence of Wettability on the Impedance of Ion Transport Through Mesoporous Silica Films. (Publisher's Version)
In: Advanced Materials Interfaces, 8 (9), Wiley, e-ISSN 2196-7350,
DOI: 10.26083/tuprints-00019733,
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Item Type: Article
Origin: Secondary publication service
Status: Publisher's Version
Title: Influence of Wettability on the Impedance of Ion Transport Through Mesoporous Silica Films
Language: English
Abstract:

Functionalized nanopores have attracted strong interest in different fields in which nanopore transport is essential. Detailed insights into mass transport through nanopores and its correlation to pore wall properties such as wettability are essential. The potential and challenges using electrochemical impedance spectroscopy (EIS) to analyze mass transport through mesoporous silica thin films with precisely adjusted wettability are discussed. The accessible area of the electrode, the charge transfer or film resistance and the diffusion coefficients of the redox probe [Ru(NH₃)₆]2+/3+ inside the mesopores are determined. The influence of experimental parameters such as silica film pre-treatment is evaluated. Hydrophilic mesoporous films display comparable diffusion coefficients around 1*10⁻⁸ cm² s⁻¹ independently of the exact wettability. As expected, hydrophobic films do not exhibit transport due to water exclusion. The sample pre-treatment strongly influences the transport characteristics. Incubation into aqueous KCl leads to a decrease in the resistance for all tested mesoporous films. This is ascribed to an increase in the silanol group concentration at the pore wall. Besides the insights into mass transport in mesoporous films and on how to measure EIS in such films, this study elucidates the importance of sample pre-treatment and surface chemistry concerning mesoporous film performance.

Journal or Publication Title: Advanced Materials Interfaces
Journal volume: 8
Number: 9
Publisher: Wiley
Collation: 10 Seiten
Classification DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
Divisions: DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1194: Interaction between Transport and Wetting Processes > Research Area C: New and Improved Applications > C04: Controlled Dynamic Wetting and the Influence of Ionic Mass Transport in Mesoporous Film
07 Department of Chemistry > Fachgebiet Makromolekulare Chemie
Date Deposited: 13 Oct 2021 14:00
Last Modified: 13 Oct 2021 14:00
DOI: 10.26083/tuprints-00019733
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-197337
Additional Information:

Supplement: https://onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1002%2Fadmi.202002095&file=admi202002095-sup-0001-SuppMat.pdf

URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19733
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