Surface wetting behavior of nanocellulose-based composite films

Thin nanocellulose-based composite films (approximately 25 μm) were made with cellulose nanocrystals (CNCs), cellulose nanofibers (CNFs), and Zn(2-methylimidazolate anion) 2 (ZM) modified CNFs for potential use in energy storage devices such as battery separators. The film morphology and surface wet...

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Bibliographic Details
Published in:Cellulose (London) 2018-09, Vol.25 (9), p.5071-5087
Main Authors: Sun, Xiuxuan, Mei, Changtong, French, Alfred D., Lee, Sunyoung, Wang, Ying, Wu, Qinglin
Format: Article
Language:English
Subjects:
Bioorganic Chemistry
Cellulose
Ceramics
Chemical industry
Chemistry
Chemistry and Materials Science
Composites
Energy storage
Envelopes
Free energy
Glass
Machine tool industry
Morphology
Nanofibers
Natural Materials
Organic Chemistry
Original Paper
Physical Chemistry
Polyethylenes
Polymer Sciences
Polypropylene
Porosity
Separators
Sustainable Development
Thin films
Wettability
Wetting
Zinc
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Summary:Thin nanocellulose-based composite films (approximately 25 μm) were made with cellulose nanocrystals (CNCs), cellulose nanofibers (CNFs), and Zn(2-methylimidazolate anion) 2 (ZM) modified CNFs for potential use in energy storage devices such as battery separators. The film morphology and surface wettability were studied in comparison with a commercial Polypropylene-Polyethylene-Polypropylene (PEP) battery separator film. Five different models were used to determine the dispersive and polar components of surface free energy (SFE) for the films and wetting envelopes for various films were constructed. Varied morphology from mixed CNC and CNF composite and increased film porosity coupled with reduced O–H groups on the surface of modified CNFs led to increased surface wettability of CNC–CNF and ZM–CNF films, respectively. All cellulose-based films showed better surface wetting behavior compared with that of the PEP film. The Owens–Wendt–Rabel–Kaelble (OWRK) method was suitable for calculating SFE components of the composite films. The total SFE of the CNC–CNF and ZM–CNF films varied from 42.55 to 53.87 mJ/m 2 in comparison with 20.19 mJ/m 2 for the PEP film. The constructed wetting-envelopes can be used to predict the wetting behavior of different solvents on the composite films for target electrochemical applications. Graphical abstract
ISSN:0969-0239
1572-882X
DOI:10.1007/s10570-018-1927-8