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Issue 38, 2018
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Surfactant controlled zwitterionic cellulose nanofibril dispersions

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Abstract

Zwitterionic cellulose nanofibrils (ZCNFs) with an isoelectric point of 3.4 were obtained by grafting glycidyltrimethylammonium chloride onto TEMPO/NaBr/NaOCl-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.

Graphical abstract: Surfactant controlled zwitterionic cellulose nanofibril dispersions

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Supplementary files

Article information


Submitted
11 Apr 2018
Accepted
30 Jul 2018
First published
01 Aug 2018

This article is Open Access

Soft Matter, 2018,14, 7793-7800
Article type
Paper

Surfactant controlled zwitterionic cellulose nanofibril dispersions

V. Calabrese, M. A. da Silva, J. Schmitt, J. C. Muñoz-Garcia, V. Gabrielli, J. L. Scott, J. Angulo, Y. Z. Khimyak and K. J. Edler, Soft Matter, 2018, 14, 7793
DOI: 10.1039/C8SM00752G

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