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Rheological properties of nanocellulose suspensions: effects of fibril/particle dimensions and surface characteristics
Department of Materials and Manufacturing Technology, Chalmers University of Technology .
Department of Chemistry and Chemical Engineering, Chalmers University of Technology.
School of Biotechnology, Royal Institute of Technology, Stockholm.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
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2017 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 24, no 6, 2499-2510 p.Article in journal (Refereed) Published
Abstract [en]

The rheological properties of aqueous suspensions based on three different nanocelluloses were compared. One system was obtained via acid hydrolysis (thus yielding crystalline nanocellulose, CNC) and the other two from mechanical shearing, but from different origins and subjected to different pretreatments. Of the latter two, one was considered to be a rather typical cellulose nanofibril (CNF) suspension whereas the other was a kind of intermediate between CNF and CNC. All three nanocellulose elements differed in dimensions as evident from transmission electron microscopy and atomic force microscopy. With regard to the length of the fibrils/particles, the three nanocelluloses formed three distinct groups with lengths between 200 and slightly more than 800 nm. The three cellulosic elements were also subjected to a TEMPO-mediated oxidation yielding a similar carboxylate content in the three systems. Furthermore, the TEMPO-oxidized elements were grafted with poly(ethylene glycol) (PEG). The amount of grafted PEG was about 35 wt%. The shear viscosity, the storage modulus and the loss modulus of suspensions of the unmodified, the TEMPO-oxidized and the grafted nanocelluloses were determined at room temperature and the solids content of the suspensions was varied between 0.7 and 2.0 wt%. It was concluded that the rheological properties varied significantly between the suspensions depending on the dimensions of the cellulosic elements and their surface characteristics. In this context, the length (or the aspect ratio) of the particles played a very important role.

Place, publisher, year, edition, pages
Springer, 2017. Vol. 24, no 6, 2499-2510 p.
National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
URN: urn:nbn:se:ltu:diva-63027DOI: 10.1007/s10570-017-1283-0ISI: 000400851800012OAI: oai:DiVA.org:ltu-63027DiVA: diva2:1088570
Note

Validerad;2017;Nivå 2;2017-05-30 (rokbeg)

Available from: 2017-04-13 Created: 2017-04-13 Last updated: 2017-06-02Bibliographically approved

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