Janus nanocellulose membrane by nitrogen plasma: Hydrophilicity to hydrophobicity selective switch.

Autor: Oberlintner A; Department of Catalysis and Chemical Reaction Engineering, National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia. Electronic address: ana.oberlintner@ki.si., Shvalya V; Department of Gaseous Electronics, Institute Jožef Stefan, Jamova 39, SI-1000 Ljubljana, Slovenia., Santhosh NM; Department of Gaseous Electronics, Institute Jožef Stefan, Jamova 39, SI-1000 Ljubljana, Slovenia., Košiček M; Department of Gaseous Electronics, Institute Jožef Stefan, Jamova 39, SI-1000 Ljubljana, Slovenia., Jerman I; Laboratory for Coating Development, Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia., Huš M; Department of Catalysis and Chemical Reaction Engineering, National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia; Association for Technical Culture of Slovenia (ZOTKS), Zaloška 65, SI-1000 Ljubljana, Slovenia; Institute for the Protection of Cultural Heritage of Slovenia (ZVKDS), Poljanska 40, SI-1000 Ljubljana, Slovenia., Cvelbar U; Department of Gaseous Electronics, Institute Jožef Stefan, Jamova 39, SI-1000 Ljubljana, Slovenia., Novak U; Department of Catalysis and Chemical Reaction Engineering, National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia. Electronic address: uros.novak@ki.si., Likozar B; Department of Catalysis and Chemical Reaction Engineering, National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia.
Jazyk: angličtina
Zdroj: Carbohydrate polymers [Carbohydr Polym] 2024 Dec 01; Vol. 345, pp. 122558. Date of Electronic Publication: 2024 Aug 02.
DOI: 10.1016/j.carbpol.2024.122558
Abstrakt: Cellulose nanofibrils are one of the keystone materials for sustainable future, yet their poor water repellency hinders their push into industrial applications. Due to complexity and poor economical outcome and/or processing toxicity of the existing hydrophobization methods, nanocellulose loses against its antagonist plastic in medical and food industries. Herein, we demonstrate for the first time the "one-side selective water-repellency activation" in nanocellulose membranes by the means of mild N 2 -plasma treatment, exhibiting lowest wettability after 20 s of treatment. Hydrophobicity and accompanying Janus character were justified by the topological, chemical and structural reorganizations in cellulose nanofibrils. The findings suggest that the mechanism behind the hydrophilic/hydrophobic change primarily relies on the interplay between OH removal and appearance of SiCH 3 , originating from the polysiloxanes-based substrate, as well as complementary CNH 2 groups formation. First-principles calculations show that NH 2 groups moderately increase hydrophobicity, while various SiCH 3 substitutions wholly change the character of the surface to repel water. Using nitrogen is shown to be crucial, as N(H)Si(CH 3 ) 3 groups induce greater hydrophobicity than simple OSi(CH 3 ) 3 . Finally, the obtained materials absorb water on the hydrophilic side, while remaining hydrophobic on the other, exhibit high tensile strength, and protection against UV light, demonstrating applicability over wide range of applications.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.)
Databáze: MEDLINE
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