University of Oulu

Terhi Suopajärvi, Juho Antti Sirviö, Henrikki Liimatainen, Nanofibrillation of deep eutectic solvent-treated paper and board cellulose pulps, Carbohydrate Polymers, Volume 169, 2017, Pages 167-175, ISSN 0144-8617,

Nanofibrillation of deep eutectic solvent-treated paper and board cellulose pulps

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Author: Suopajärvi, Terhi1; Sirviö, Juho Antti1; Liimatainen, Henrikki1
Organizations: 1Fiber and Particle Engineering Unit, P.O. Box 4300, FI-90014 University of Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 2 MB)
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Language: English
Published: Elsevier, 2017
Publish Date: 2019-12-02


In this work, several cellulose board grades, including waste board, fluting, and waste milk container board, were pretreated with green choline chloride-urea deep eutectic solvent (DES) and nanofibrillated using a Masuko grinder. DES-treated bleached chemical birch pulp, NaOH-swollen waste board, and bleached chemical birch pulp were used as reference materials. The properties of the nanofibrils after disc grinding were compared with those obtained through microfluidization. Overall, the choline chloride-urea DES pretreatment significantly enhanced the nanofibrillation of the board pulps in both nanofibrillation methods—as compared with NaOH-treated pulps—and resulted in fine and long individual nanofibrils and some larger nanofibril bunches, as determined by field emission scanning electron microscopy and transmission electron microscopy. The nanofibril suspensions obtained from the DES pretreatment had a viscous, gel-like appearance with shear thinning behavior. The nanofibrils maintained their initial crystalline structure with a crystallinity index of 61%–47%. Improved board handsheet properties also showed that DES-treated and Masuko-ground waste board and paper nanocellulose can potentially enhance the strength of the board. Consequently, the DES chemical pretreatment appears to be a promising route to obtain cellulose nanofibrils from waste board and paper.

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Series: Carbohydrate polymers
ISSN: 0144-8617
ISSN-E: 1879-1344
ISSN-L: 0144-8617
Volume: 169
Pages: 167 - 175
DOI: 10.1016/j.carbpol.2017.04.009
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
218 Environmental engineering
215 Chemical engineering
Funding: The authors would like to acknowledge the funding provided by the Council of Oulu Region, granted by the European Regional Development Fund of the European Union for the High Performance Pretreatment of Lignocellulosic Biomasses for the Sustainable Biorefinery Value Chains Project (PREBIO).
Copyright information: © 2017 The Authors. Published by Elsevier Inc. This manuscript version is made available under the CC-BY-NC-ND 4.0 license