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Isolation of Mixed Compositions of Cellulose Nanocrystals, Microcrystalline Cellulose, and Lignin Nanoparticles from Wood Pulps
RISE Research Institutes of Sweden. EPFL, Switzerland.ORCID iD: 0000-0001-9782-3860
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.ORCID iD: 0009-0003-6832-6496
RISE Research Institutes of Sweden.ORCID iD: 0000-0002-8992-3623
KTH Royal Institute of Technology, Sweden.
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2023 (English)In: ACS Omega, E-ISSN 2470-1343, Vol. 8, no 24, p. 21474-21484Article in journal (Refereed) Published
Abstract [en]

From a circular economy perspective, one-pot strategies for the isolation of cellulose nanomaterials at a high yield and with multifunctional properties are attractive. Here, the effects of lignin content (bleached vs unbleached softwood kraft pulp) and sulfuric acid concentration on the properties of crystalline lignocellulose isolates and their films are explored. Hydrolysis at 58 wt % sulfuric acid resulted in both cellulose nanocrystals (CNCs) and microcrystalline cellulose at a relatively high yield (>55%), whereas hydrolysis at 64 wt % gave CNCs at a lower yield (<20%). CNCs from 58 wt % hydrolysis were more polydisperse and had a higher average aspect ratio (1.5-2×), a lower surface charge (2×), and a higher shear viscosity (100-1000×). Hydrolysis of unbleached pulp additionally yielded spherical nanoparticles (NPs) that were <50 nm in diameter and identified as lignin by nanoscale Fourier transform infrared spectroscopy and IR imaging. Chiral nematic self-organization was observed in films from CNCs isolated at 64 wt % but not from the more heterogeneous CNC qualities produced at 58 wt %. All films degraded to some extent under simulated sunlight trials, but these effects were less pronounced in lignin-NP-containing films, suggesting a protective feature, but the hemicellulose content and CNC crystallinity may be implicated as well. Finally, heterogeneous CNC compositions obtained at a high yield and with improved resource efficiency are suggested for specific nanocellulose uses, for instance, as thickeners or reinforcing fillers, representing a step toward the development of application-tailored CNC grades. © 2023 The Authors. 

Place, publisher, year, edition, pages
American Chemical Society , 2023. Vol. 8, no 24, p. 21474-21484
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Biochemicals
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URN: urn:nbn:se:ri:diva-65709DOI: 10.1021/acsomega.3c00295Scopus ID: 2-s2.0-85162876606OAI: oai:DiVA.org:ri-65709DiVA, id: diva2:1786527
Note

This research was funded by the RISE RP18 Nanocellulose Research Program, the RISE Nanocellulose Competence Platform, and the Tandem Forest Values Program “SUBSTAINABLE” project (Formas grant number 2019-02508).

Available from: 2023-08-09 Created: 2023-08-09 Last updated: 2024-03-13Bibliographically approved

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Abitbol, TiffanyKubat, MikaelaBrännvall, ElisabetNordgren, NiklasStevanic Srndovic, Jasna

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Abitbol, TiffanyKubat, MikaelaBrännvall, ElisabetNordgren, NiklasStevanic Srndovic, Jasna
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