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Redispersion Strategies for Dried Cellulose Nanofibrils
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0002-1402-2679
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0002-3906-4381
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0003-1874-2187
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0002-5444-7276
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2021 (English)In: ACS Sustainable Chemistry and Engineering, E-ISSN 2168-0485, Vol. 9, no 33, p. 11003-11010Article in journal (Refereed) Published
Abstract [en]

The potential for large-scale applications of cellulose nanofibrils (CNFs) is limited by the high water content of the starting material, which leads to high transportation costs and undesirable environmental impact. However, drying of CNFs results in loss of their nanoscopic dimensions leading to deterioration of their unique inherent mechanical properties. Herein, thorough redispersion studies of both fundamental and applied nature have been conducted in order to evaluate the effect of charge, redispersing agent, and drying method. Freeze-dried CNF dispersions were successfully redispersed by either increasing the charge density or adding redispersing agents. The greatest effect on redispersibility was achieved with fractionated LignoBoost lignin as redispersing agent, and this is attributed to steric repulsion during water removal and reduced CNF adhesion. Furthermore, the results unexpectedly show that redispersion is easier when the CNFs are dried in the form of nanopapers. By using this approach, excellent redispersibility was achieved even without a redispersing agent. Nanopapers formed from the redispersed CNFs was found to have essentially the same mechanical properties as those made from never-dried CNFs. Hence, this work suggests solutions for making CNFs viable for large-scale application while maintaining their nanoscale dimensions and their ability to create nanopapers with excellent mechanical properties.

Place, publisher, year, edition, pages
American Chemical Society (ACS) , 2021. Vol. 9, no 33, p. 11003-11010
Keywords [en]
Cellulose nanofibrils, Redispersibility, Colloidal stability, Redispersing agents, Nanopapers, Mechanical properties
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-301826DOI: 10.1021/acssuschemeng.1c02122ISI: 000689137600004Scopus ID: 2-s2.0-85113837473OAI: oai:DiVA.org:kth-301826DiVA, id: diva2:1594376
Note

QC 20210915

Available from: 2021-09-15 Created: 2021-09-15 Last updated: 2022-06-25Bibliographically approved

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Nordenström, MalinKaldéus, TahaniErlandsson, JohanPettersson, TorbjörnMalmström, EvaWågberg, Lars

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Nordenström, MalinKaldéus, TahaniErlandsson, JohanPettersson, TorbjörnMalmström, EvaWågberg, Lars
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Wallenberg Wood Science CenterFibre- and Polymer Technology
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ACS Sustainable Chemistry and Engineering
Paper, Pulp and Fiber Technology

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