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Centrifuge fractionation during purification of cellulose nanocrystals after acid hydrolysis and consequences on their chiral self-assembly
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0002-4583-723x
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Glycoscience. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0003-3572-7798
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0002-5444-7276
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. Materials Science and Engineering Department (MSE), Faculty of Mechanical, Maritime and Materials Engineering (3mE), Delft University of Technology, 2628 CD Delft, The Netherlands.ORCID iD: 0000-0001-7423-7316
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2024 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 328, article id 121723Article in journal (Refereed) Published
Abstract [en]

The inherent colloidal dispersity (due to length, aspect ratio, surface charge heterogeneity) of CNCs, when produced using the typical traditional sulfuric acid hydrolysis route, presents a great challenge when interpreting colloidal properties and linking the CNC film nanostructure to the helicoidal self-assembly mechanism during drying. Indeed, further improvement of this CNC preparation route is required to yield films with better control over the CNC pitch and optical properties. Here we present a modified CNC-preparation protocol, by fractionating and harvesting CNCs with different average surface charges, rod lengths, aspect ratios, already during the centrifugation steps after hydrolysis. This enables faster CNC fractionation, because it is performed in a high ionic strength aqueous medium. By comparing dry films from the three CNC fractions, discrepancies in the CNC self-assembly and structural colors were clearly observed. Conclusively, we demonstrate a fast protocol to harvest different populations of CNCs, that enable tailored refinement of structural colors in CNC films.

Place, publisher, year, edition, pages
Elsevier Ltd , 2024. Vol. 328, article id 121723
Keywords [en]
Cellulose nanocrystals, Fractionation, Structural colors, Sulfuric acid hydrolysis
National Category
Polymer Technologies Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-342832DOI: 10.1016/j.carbpol.2023.121723Scopus ID: 2-s2.0-85182892792OAI: oai:DiVA.org:kth-342832DiVA, id: diva2:1833355
Note

QC 20240201

Available from: 2024-01-31 Created: 2024-01-31 Last updated: 2024-02-01Bibliographically approved

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Svagan, Anna JustinaVilaplana, FranciscoPettersson, TorbjörnAnusuyadevi, Prasaanth RaviHenriksson, GunnarHedenqvist, Mikael S.

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Svagan, Anna JustinaVilaplana, FranciscoPettersson, TorbjörnAnusuyadevi, Prasaanth RaviHenriksson, GunnarHedenqvist, Mikael S.
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Fibre- and Polymer TechnologyGlycoscienceWallenberg Wood Science CenterWood Chemistry and Pulp TechnologyPolymeric Materials
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Carbohydrate Polymers
Polymer TechnologiesPhysical Chemistry

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