Centrifuge fractionation during purification of cellulose nanocrystals after acid hydrolysis and consequences on their chiral self-assembly.

Autor: Svagan AJ; Royal Institute of Technology (KTH), Dept. of Fibre and Polymer Technology, Stockholm, Sweden. Electronic address: svagan@kth.se., Vilaplana F; Royal Institute of Technology (KTH), Dept. of Chemistry, Div. Glycoscience, Albanova University Centre, Stockholm, Sweden; Royal Institute of Technology (KTH), Wallenberg Wood Science Centre (WWSC), Stockholm, Sweden., Pettersson T; Royal Institute of Technology (KTH), Dept. of Fibre and Polymer Technology, Stockholm, Sweden., Anusuyadevi PR; Royal Institute of Technology (KTH), Dept. of Fibre and Polymer Technology, Stockholm, Sweden; Materials Science and Engineering Department (MSE), Faculty of Mechanical, Maritime and Materials Engineering (3mE), Delft University of Technology, 2628 CD Delft, the Netherlands., Henriksson G; Royal Institute of Technology (KTH), Dept. of Fibre and Polymer Technology, Stockholm, Sweden., Hedenqvist M; Royal Institute of Technology (KTH), Dept. of Fibre and Polymer Technology, Stockholm, Sweden.
Jazyk: angličtina
Zdroj: Carbohydrate polymers [Carbohydr Polym] 2024 Mar 15; Vol. 328, pp. 121723. Date of Electronic Publication: 2023 Dec 20.
DOI: 10.1016/j.carbpol.2023.121723
Abstrakt: 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.
Competing Interests: Declaration of competing interest The authors declare no competing interests.
(Copyright © 2023 The Authors. Published by Elsevier Ltd.. All rights reserved.)
Databáze: MEDLINE
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