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 16:30
      Last Modified: 11 Apr 2019 15:58
      URI: https://ueaeprints.uea.ac.uk/id/eprint/67934
      DOI: 10.1039/C8SM00752G

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