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Janus‐Type Hybrid Paper Membranes

Nau, Maximilian ; Herzog, Nicole ; Schmidt, Johannes ; Meckel, Tobias ; Andrieu‐Brunsen, Annette ; Biesalski, Markus (2022):
Janus‐Type Hybrid Paper Membranes. (Postprint)
In: Advanced Materials Interfaces, 6 (18), John Wiley & Sons, e-ISSN 2196-7350,
DOI: 10.26083/tuprints-00021739,

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Item Type: Article
Origin: Secondary publication service
Status: Postprint
Title: Janus‐Type Hybrid Paper Membranes
Language: English

Functional paper-based materials and devices have been increasingly attractive to scientists in the recent past. In particular, the possibility to functionalize the surface of paper fibers with tailor-made coatings has broadened a possible scope of emerging application considerably. This work introduces novel functional paper membranes with adjustable gradient and Janus-type wettability based on gradient and Janus-type silica coating distribution along the paper cross-section. Correlation of CLSM (distribution), thermogravimetric analysis (silica amount), and Kr-BET (surface area; BET: Brunauer–Emmett–Teller) reveals an extremely low coating thickness, in the range of just a few nanometers, being sufficient to fully inverse paper wettability from hydrophilic to very hydrophobic excluding water. This asymmetric wettability, originating from an asymmetric silica distribution along the paper cross-section, is established by synchronizing silane hydrolysis and condensation reaction rates with silane transport rates in paper within a simple and scalable one-step drying process after having immersed a paper sheet into a tetraethoxysilane-containing precursor solution. As silica by itself, like paper, is a hydrophilic material, the observed hydrophobicity is related to a reduction in cellulose fiber nanoscale porosity controlling water imbibition. While being relevant in manifold applications, these ultrathin, Janus-type hybrid paper membranes are demonstrated to show directed gating and selective oil–water separation.

Journal or Publication Title: Advanced Materials Interfaces
Volume of the journal: 6
Issue Number: 18
Place of Publication: Darmstadt
Publisher: John Wiley & Sons
Collation: 23 Seiten
Uncontrolled Keywords: Janus membranes, hybrid materials, asymmetric material distribution, ultrathin coating, functional paper
Classification DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
Divisions: 10 Department of Biology > Membrane Dynamics
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1194: Interaction between Transport and Wetting Processes > Research Area A: Generic Experiments > A05: Wetting and Transport on Swellable, Immobilized Polymer Brushes and Polymer Networks
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: 21 Jul 2022 13:09
Last Modified: 09 Jan 2023 10:50
DOI: 10.26083/tuprints-00021739
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-217392
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/21739
PPN: 503411175
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