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- W3194826260 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." @default.
- W3194826260 created "2021-08-30" @default.
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- W3194826260 date "2021-01-01" @default.
- W3194826260 modified "2023-10-09" @default.
- W3194826260 title "Regioselective and water-assisted surface esterification of never-dried cellulose: nanofibers with adjustable surface energy" @default.
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- W3194826260 doi "https://doi.org/10.1039/d1gc02292j" @default.
- W3194826260 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8452180" @default.
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