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Insights into the interplay of wetting and transport in mesoporous silica films

Khalil, Adnan ; Zimmermann, Matthias ; Bell, Alena K. ; Kunz, Ulrike ; Hardt, Steffen ; Kleebe, Hans-Joachim ; Stark, Robert W. ; Stephan, Peter ; Andrieu-Brunsen, Annette (2022):
Insights into the interplay of wetting and transport in mesoporous silica films. (Postprint)
In: Journal of Colloid and Interface Science, 560, Elsevier, ISSN 0021-9797,
DOI: 10.26083/tuprints-00021740,
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Item Type: Article
Origin: Secondary publication service
Status: Postprint
Title: Insights into the interplay of wetting and transport in mesoporous silica films
Language: English
Abstract:

The understanding and design of wetting-transport and wetting-charge-transport interplay in nanometer-sized pores is a still not fully understood key step in improving nanopore transport-related applications. A control of mesopore wettability accompanied by pore filling and ionic mesopore accessibility analysis is expected to deliver major insights into this interplay of nanoscale pore wetting and transport.

For a systematic understanding, we demonstrate a gradual adjustment of nanopore ionic accessibility by gradually tuning silica nanopore wettability using chemical vapor phase deposition of 1H,1H,2H,2H-perfluorooctyl dimethylchlorosilane. The mutual influence of wetting on liquid imbibition, condensation, and molecular transport as well as on heat transfer were studied by ellipsometry, cyclic voltammetry and boiling experiments, respectively.

A multi-methodical analytic approach was used to directly couple wetting properties of mesoporous silica thin films to ionic mesopore accessibility allowing us to determine two different ion transport mechanisms based on three defined wetting regimes as well as a threshold hydrophobicity suppressing pore accessibility. Furthermore, boiling experiments showed a clear increase in nucleation site density upon changing the wettability of the mesoporous surfaces from hydrophilic to hydrophobic. Hence, these results provide insights into the complex interplay of pore wall functionalization, wetting, and charge-dependent nanopore properties.

Journal or Publication Title: Journal of Colloid and Interface Science
Volume of the journal: 560
Place of Publication: Darmstadt
Publisher: Elsevier
Collation: 32 Seiten
Uncontrolled Keywords: Mesoporous silica thin films, Wettability, Ionic transport, Condensation, Imbibition
Classification DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
Divisions: 11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy
11 Department of Materials and Earth Sciences > Material Science > Physics of Surfaces
16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD)
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1194: Interaction between Transport and Wetting Processes > Research Area A: Generic Experiments > A02: Experimental Investigation of Coalescence and Breakup of Droplets on Solid Surfaces – Generic Configuration Sessile Drop
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1194: Interaction between Transport and Wetting Processes > Research Area A: Generic Experiments > A07: Raman Spectroscopy for Investigating Mass Transport and Concentration Gradients in Mixtures
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1194: Interaction between Transport and Wetting Processes > Research Area C: New and Improved Applications > C02: Multiscale Investigations of Boiling of Complex Fluids on Complex Surfaces
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
16 Department of Mechanical Engineering > Institute for Nano- and Microfluidics (NMF)
Date Deposited: 21 Jul 2022 13:11
Last Modified: 21 Jul 2022 13:12
DOI: 10.26083/tuprints-00021740
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-217405
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/21740
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