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Optimization of the Isolation of Nanocrystals from Microcrystalline Cellulose by Acid Hydrolysis
Norwegian University of Science and Technology (NTNU), Trondheim.
Norwegian University of Science and Technology (NTNU), Trondheim.ORCID iD: 0000-0003-4762-2854
2006 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 13, no 2, p. 171-180Article in journal (Refereed) Published
Abstract [en]

The objective of this work was to find a rapid, high-yield process to obtain an aqueous stable colloid suspension of cellulose nanocrystals/whiskers. Large quantities are required since these whiskers are designed to be extruded into polymers in the production of nano-biocomposites. Microcrystalline cellulose (MCC), derived from Norway spruce (Picea abies), was used as the starting material. The processing parameters have been optimized by using response surface methodology. The factors that varied during the process were the concentration of MCC and sulfuric acid, the hydrolysis time and temperature, and the ultrasonic treatment time. Responses measured were the median size of the cellulose particles/whiskers and yield. The surface charge as calculated from conductometric titration, microscopic examinations (optical and transmission electron microscopy), and observation of birefringence were also investigated in order to determine the outcome (efficiency) of the process. With a sulfuric acid concentration of 63.5% (w/w), it was possible to obtain cellulose nanocrystals/whiskers with a length between 200 and 400 nm and a width less than 10 nm in approximately 2 h with a yield of 30% (of initial weight).

Place, publisher, year, edition, pages
2006. Vol. 13, no 2, p. 171-180
National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
URN: urn:nbn:se:ltu:diva-8634DOI: 10.1007/s10570-006-9061-4Local ID: 7287cee0-4be1-11dc-ac5f-000ea68e967bOAI: oai:DiVA.org:ltu-8634DiVA, id: diva2:981572
Note

Upprättat; 2006; 20070816 (krioks)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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Mathew, Aji P.Oksman, Kristiina

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