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    Surfactant controlled zwitterionic cellulose nanofibril dispersions

    Year: 2018

    Journal: Soft Matter, Volume 14, OCT 14, page 7793–7800

    Authors: Calabrese, Vincenzo; da Silva, Marcelo A.; Schmitt, Julien; Munoz-Garcia, Juan C.; Gabrielli, Valeria; Scott, Janet L.; Angulo, Jesus; Khimyak, Yaroslav Z.; Edler, Karen J.

    Organizations: EPSRC [EP/N033310/1, EP/N033337/1]; BBSRC [BB/M011216/1]; NSF [DMR-0520547]; European Union's Horizon 2020 research and innovation programme under the SINE2020 project [654000]; University of Bath; ISIS Neutron and Muon Source [RB1710159]

    Zwitterionic cellulose nanofibrils (ZCNFs) with an isoelectric point of 3.4 were obtained by grafting glycidyltrimethylammonium chloride onto TEMPO/NaBriNaOCl-oxidised cellulose nanofibrils. The 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. In contrast, upon addition of the cationic species dodecyltrimethylammonium bromide, the dispersion undergoes charge neutralization, leading to more pronounced flocculation.
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