Surfactant controlled zwitterionic cellulose nanofibril dispersions

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

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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.
Original languageEnglish
Pages (from-to)7793-7800
Number of pages8
JournalSoft Matter
Issue number38
Early online date1 Aug 2018
Publication statusPublished - 14 Oct 2018


  • cellulose nanofibrils
  • NMR
  • soft matter

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