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Strong aqueous gels of cellulose nanofibers and nanowhiskers isolated from softwood flour
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-4762-2854
2011 (English)In: TAPPI Journal, ISSN 0734-1415, Vol. 10, no 2, p. 42565-Article in journal (Refereed) Published
Abstract [en]

Two nanocelluloses (cellulose nanofibers [CNF] and nanowhiskers [CNW]) were extracted from softwood flour using chemical refining followed either by mechanical fibrillation or acid hydrolysis. The CNF slurry formed an opaque gel that exhibited highly coiled and entangled long fibers with widths between 10 and 20 nm when studied using atomic force microscopy (AFM). The aqueous suspension of the CNW formed a transparent gel with unique morphology of rigid and uniform, whiskerlike structures with widths as low as 1.5-3 nm and lengths in micrometer levels. The viscoelastic properties of these hydrogels with solids content of 0.2 wt% were measured using dynamic rheology experiments. The elastic modulus (G') and viscous modulus (G '') were frequency independent in the low-frequency region. Furthermore, G' was almost 10-fold higher than G '', showing a typical elastic gel behavior. The lower crystallinity obtained from X-ray analysis indicated that the unique structure of CNW from wood could be attributed to the native cellulose being partly dissolved and regenerated during acid hydrolysis

Place, publisher, year, edition, pages
2011. Vol. 10, no 2, p. 42565-
National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
URN: urn:nbn:se:ltu:diva-14141Local ID: d7a1d520-082e-11e0-b767-000ea68e967bOAI: oai:DiVA.org:ltu-14141DiVA, id: diva2:987095
Note
Validerad; 2011; 20101215 (krioks)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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http://www.tappi.org/Bookstore/Technical-Papers/Journal-Articles/TAPPI-JOURNAL/Archives/2011/February/Table-of-Contents/Strong-Aqueous-Gels-of-Cellulose-Nanofibers.aspx

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Gong, GuanMathew, Aji P.Oksman, Kristiina

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