NDLI: The behaviour of cationic NanoFibrillar Cellulose in aqueous media

Content Provider	Springer Nature Link
Author	Olszewska, Anna Eronen, Paula Johansson, Leena Sisko Malho, Jani Markus Ankerfors, Mikael Lindström, Tom Ruokolainen, Janne Laine, Janne Österberg, Monika
Copyright Year	2011
Abstract	This paper deals, with cationically modified NanoFibrillar Cellulose (cat NFC), obtained by reacting a dissolving pulp with 2,3-epoxypropyl trimethylammonium chloride (EPTMAC). The cat NFC was thoroughly characterized in terms of morphology and physical properties. The dimensions of individual cellulose nanofibrils were determined by atomic force microscopy (AFM) imaging in water and in air. Fibrils as thin as 0.8–1.2 nm were observed in water. The fibril diameter changed upon drying and the average size was further quantified by image analysis. The experiments showed the importance of characterizing nanocellulosic materials in situ before drying. The fibril size in air was confirmed by cryogenic transmission electron microscopy (cryo-TEM), and it was found to be 2.6–3.0 nm. Smooth ultrathin films of cationic NFC were prepared by spincoating on silica substrates. The effect of electrolyte concentration and pH on swelling of the cationic NFC film was studied using a quartz crystal microbalance with dissipation. The results showed that at pH = 8 the cat NFC film was insensitive to electrolyte changes while at pH = 4.5, the water content of the film decreased with increasing ionic strength. The electrophoretic mobility measurements showed a cationic zeta potential for the cat NFC that decreased at increasing pH, verifying the swelling behaviour.
Starting Page	1213
Ending Page	1226
Page Count	14
File Format	PDF
ISSN	09690239
Journal	Cellulose
Volume Number	18
Issue Number	5
e-ISSN	1572882X
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-07-16
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	NanoFibrillar Cellulose MFC AFM Fibril dimensions Swelling QCM-D Bioorganic Chemistry Organic Chemistry Polymer Sciences Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Polymers and Plastics

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