@article{4303840ad4d949abb905dca1140e3df8,
title = "Regioselective and water-assisted surface esterification of never-dried cellulose: nanofibers with adjustable surface energy",
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−1are 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.",
author = "Marco Beaumont and Otoni, {Caio G.} and Mattos, {Bruno D.} and Koso, {Tetyana V.} and Roozbeh Abidnejad and Bin Zhao and Anett Kondor and King, {Alistair W.T.} and Rojas, {Orlando J.}",
note = "Funding Information: Prof. Watson Loh and the S{\~a}o Paulo Research Foundation (FAPESP; grant no. 2016/13926-7) are acknowledged for granting access to LUMiSizer, and Caroline Silva for experimental support. This research was funded in part by the Austrian Science Fund (FWF) (J4356), FAPESP (grant no. 2019/00370-9), the Academy of Finland (Project #311255, {\textquoteleft}WTF-Click-Nano{\textquoteright}) and the European Research Council (ERC) under the European Union{\textquoteright}s Horizon 2020 research and innovation program (grant agreement no. 788489). Funding Information: Prof. Watson Loh and the S?o Paulo Research Foundation (FAPESP; grant no. 2016/13926-7) are acknowledged for granting access to LUMiSizer, and Caroline Silva for experimental support. This research was funded in part by the Austrian Science Fund (FWF) (J4356), FAPESP (grant no. 2019/00370-9), the Academy of Finland (Project #311255, ?WTF-Click-Nano?) and the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement no. 788489). Publisher Copyright: {\textcopyright} The Royal Society of Chemistry 2021.",
year = "2021",
month = sep,
day = "21",
doi = "10.1039/d1gc02292j",
language = "English",
volume = "23",
pages = "6966--6974",
journal = "Green Chemistry",
issn = "1463-9262",
publisher = "Royal Society of Chemistry RSC",
number = "18",
}