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June 2018
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114 Reads
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23 Citations
Celluloses and nanofibrillar celluloses, and the basis of their luminescence are studied. Comparative studies of photoluminescence of birch kraft pulp and microfibrillar and nanofibrillar celluloses manufactured from the same pulp were made with the aim to investigate their luminescence properties. Comparison was made with the earlier literature and the origin of the photoluminescence of these cellulose variants is discussed.
January 2015
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38 Reads
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3 Citations
The ultimate goal of this project was to develop a practical and economical process for industrial fibrillar cellulose film production. The first aim of the work was to develop a fast and practical method for the production of fibrillated cellulose films for them to be made in minutes instead of hours. In the second stage, films made of different fibrillar cellulose grades were analyzed to determine those levels of properties achievable with this method, and how much they depend on the diverse properties of different grades. The analyses of these films showed that the differences between fibrillar cellulose grades had slight or no effect on the measured film properties, whereas relative humidity had significant effect. AFM-images and oxygen transmission measurements indicated the similarity in film structures. The new production method was found useful in studies of film properties because of its high production rate and even film quality. The results also showed that the energy consumption on fibrillated cellulose production does not correlate with the film quality.
... In lignocellulose, this leads to a blueshift (Fig. 5c) and a decrease (Fig. 3a) in emission, as observed in the present study. 6. Phosphorescence was not examined in this study, but reported for cellulose by Grönroos et al. (2018). ...
June 2018
... It is well-known that below a critical grammage the strength of the NFC films rapidly decreases, which may be understood by the increasing impact of film defects. Bessonoff and Paltakari (2015) investigated the impact of grammage of NFC films on the tensile properties of different NFCs. The studies showed that the strength of the NFC films rapidly decreased below a grammage-value of about 40 g/m 2 . ...
January 2015
