University of Oulu

Mostafa Y. Ismail, Minna Patanen, Juho Antti Sirviö, Miikka Visanko, Takuji Ohigashi, Nobuhiro Kosugi, Marko Huttula, Henrikki Liimatainen, Hybrid films of cellulose nanofibrils, chitosan and nanosilica—Structural, thermal, optical, and mechanical properties, Carbohydrate Polymers, Volume 218, 2019, Pages 87-94, ISSN 0144-8617,

Hybrid films of cellulose nanofibrils, chitosan and nanosilica : structural, thermal, optical, and mechanical properties

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Author: Ismail, Mostafa Y.1; Patanen, Minna2; Sirviö, Juho Antti1;
Organizations: 1Fibre and Particle Engineering, University of Oulu, P.O. Box 4300, FI-90014, Finland
2Nano and Molecular Systems Research Unit, Faculty of Science, University of Oulu, P.O. Box 3000, FI-90014, Finland
3UVSOR Synchrotron Facility, Institute for Molecular Science, Myodaiji, Okazaki, 444-8585, Japan
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.4 MB)
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Language: English
Published: Elsevier, 2019
Publish Date: 2020-04-27


Organic-inorganic hybrid films were fabricated from cellulose nanofibrils (CNF) and nanosilica (5–30% wt) embedded in a chitosan (Chi) biopolymer matrix using a slow evaporation method. The self-standing films exhibited high strength and modulus up to 120 ± 5 MPa and 7.5 ± 0.4 GPa, respectively, which are remarkably high values for biopolymer/chitosan hybrids. Scanning electron microscopy showed that the nanosilica is formed of larger aggregates within the lamellar CNF network structure. This observation was further confirmed using synchrotron-based scanning transmission x-ray microscopy (STXM) with the capability to determine the spatial and chemical distribution analysis of the constituents of films. It is interesting that the thermal stability of the hybrid films improved as the nanosilica content increased. Furthermore, the nanosilica effectively filled the pores in the CNF network, thus decreasing the UV transmission and the visible light transmittance of the films.

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Series: Carbohydrate polymers
ISSN: 0144-8617
ISSN-E: 1879-1344
ISSN-L: 0144-8617
Volume: 218
Pages: 87 - 94
DOI: 10.1016/j.carbpol.2019.04.065
Type of Publication: A1 Journal article – refereed
Field of Science: 221 Nanotechnology
215 Chemical engineering
216 Materials engineering
Funding: We wish to acknowledge financial support from the I4Future doctoral program, which is part of the European Union's Horizon 2020 research and innovation program under Marie Skłodowska-Curie grant agreement No. 713606.
EU Grant Number: (713606) I4FUTURE - Novel Imaging and Characterisation Methods in Bio, Medical, and Environmental Research and Technology Innovations
Copyright information: © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license