Surfactant controlled zwitterionic cellulose nanofibril dispersions

Calabrese, Vincenzo, da Silva, Marcelo A, Schmitt, Julien, Muñoz-Garcia, Juan C, Gabrielli, Valeria, Scott, Janet L, Angulo, Jesus, Khimyak, Yaroslav Z and Edler, Karen J (2018) Surfactant controlled zwitterionic cellulose nanofibril dispersions. Soft Matter, 14 (38). pp. 7793-7800. ISSN 1744-683X

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Abstract

Zwitterionic cellulose nanofibrils (ZCNF) with isoelectric point of 3.4 were obtained by grafting glycidyltrimethylammonium chloride onto TEMPO/NaBr/NaOCl-oxidised cellulose nanofibrils. ZCNF aqueous dispersions were characterized via transmission electron microscopy, rheology and small angle neutron scattering, revealing a fibril-bundle structure with pronounced aggregation at pH 7. Surfactants were successfully employed to tune the stability of the ZCNF dispersions. Upon addition of the anionic surfactant, sodium dodecyl sulfate, the ZCNF dispersion shows individualized fibrils due to electrostatic stabilization. On the contrary, upon addition of the cationic species dodecyltrimethylammonium bromide, the dispersion undergoes charge neutralization, leading to more pronounced flocculation.

Item Type: Article
Uncontrolled Keywords: cellulose nanofibrils,nmr,soft matter
Faculty \ School: Faculty of Science > School of Pharmacy
Faculty of Science > School of Chemistry
Depositing User: LivePure Connector
Date Deposited: 01 Aug 2018 15:30
Last Modified: 18 Mar 2020 01:47
URI: https://ueaeprints.uea.ac.uk/id/eprint/67934
DOI: 10.1039/C8SM00752G

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