Clean and reactive nanostructured cellulose surface

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2013-06
Major/Subject
Mcode
Degree programme
Language
en
Pages
8
983-990
Series
CELLULOSE, Volume 20, issue 3
Abstract
A simple, solvent-free and low cost method to activate the surface of nanofibrillated cellulose films for further functionalization is presented. The method is based on the oxidative properties of UV radiation and ozone, to effectively remove contaminants from nanocellulosic surface, which remains clean and reactive for at least a week. The efficiency of the method is demonstrated by X-ray photoelectron spectroscopy and contact angle measurements. In clear contrast to previous results on nanoscaled cellulose the relative atomic concentration of non-cellulosic carbon atoms was only 4%, and water completely wetted the surface within seconds. After activation, neither chemical degradation nor morphological changes on cellulose were observed. This surface activation is essential for further functionalization of the film in dry state or nonpolar media. The surface activation was confirmed by silylation and a four times higher degree of substitution was achieved on the activated sample compared to non-activated reference film, as monitored with XPS.
Description
VK: T10402; T10413
Keywords
Microfibrillated cellulose, Ozonation, Film, Cleaning, UV
Other note
Citation
Österberg, M, Peresin, M S, Johansson, L-S & Tammelin, T 2013, ' Clean and reactive nanostructured cellulose surface ', Cellulose, vol. 20, no. 3, pp. 983-990 . https://doi.org/10.1007/s10570-013-9920-8