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Abstract
A new regioselective route is introduced for surface modification of biological colloids in the presence of water. Taking the case of cellulose nanofibers (CNFs), we demonstrate a site-specific (93% selective) reaction between the primary surface hydroxyl groups (C6-OH) of cellulose and acyl imidazoles. CNFs bearing C6-acetyl and C6-isobutyryl groups, with a degree of substitution of up to 1 mmol g(-1) are obtained upon surface esterification, affording CNFs of adjustable surface energy. The morphological and structural features of the nanofibers remain largely unaffected, but the regioselective surface reactions enable tailoring of their interfacial interactions, as demonstrated in oil/water Pickering emulsions. Our method precludes the need for drying or exchange with organic solvents for surface esterification, otherwise needed in the synthesis of esterified colloids and polysaccharides. Moreover, the method is well suited for application at high-solid content, opening the possibility for implementation in reactive extrusion and compounding. The proposed acylation is introduced as a sustainable approach that benefits from the presence of water and affords a high chemical substitution selectivity.
Original language | English |
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Pages (from-to) | 6966-6974 |
Number of pages | 9 |
Journal | Green Chemistry |
Volume | 23 |
Issue number | 18 |
Early online date | 2 Aug 2021 |
DOIs | |
Publication status | Published - 21 Sept 2021 |
MoE publication type | A1 Journal article-refereed |
Keywords
- MOISTURE SORPTION
- BINDING PROPERTIES
- ACETYLATION
- FIBERS
- WOOD
- MICROFIBRILS
- SUSPENSIONS
- OXIDATION
- SELECTION
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Dive into the research topics of 'Regioselective and water-assisted surface esterification of never-dried cellulose: nanofibers with adjustable surface energy'. Together they form a unique fingerprint.Projects
- 1 Finished
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BioELCell: Bioproducts Engineered from Lignocelluloses: from plants and upcycling to next generation materials
Rojas, O. (Principal investigator), Abidnejad, R. (Project Member), Ajdary, R. (Project Member), Bhattarai, M. (Project Member), Zhu, Y. (Project Member), Zhao, B. (Project Member), Robertson, D. (Project Member), Reyes Torres, G. (Project Member), Johansson, L.-S. (Project Member), Greca, L. (Project Member), Klockars, K. (Project Member), Kämäräinen, T. (Project Member), Majoinen, J. (Project Member), Tardy, B. (Project Member), Dufau Mattos, B. (Project Member) & Ressouche, E. (Project Member)
30/07/2018 → 31/07/2023
Project: EU: ERC grants