Understanding heat driven gelation of anionic cellulose nanofibrils: Combining Saturation Transfer Difference (STD) NMR, Small Angle X-ray Scattering (SAXS) and rheology

Calabrese, Vincenzo, Muñoz-García, Juan C., Schmitt, Julien, da Silva, Marcelo A., Scott, Janet L., Angulo, Jesús, Khimyak, Yaroslav Z. and Edler, Karen J. (2019) Understanding heat driven gelation of anionic cellulose nanofibrils: Combining Saturation Transfer Difference (STD) NMR, Small Angle X-ray Scattering (SAXS) and rheology. Journal of Colloid and Interface Science, 535. pp. 205-213. ISSN 0021-9797

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      Abstract

      A novel mechanism of heat-triggered gelation for oxidised cellulose nanofibrils (OCNF) is reported. We demonstrate that a synergistic approach combining rheology, small-angle X-ray scattering (SAXS) and saturation transfer difference NMR (STD NMR) experiments enables a detailed characterisation of gelation at different length scales. OCNF dispersions experience an increase in solid-like behaviour upon heating as evidenced by rheological studies, associated with enhanced interfibrillar interactions measured using SAXS. Interactions result in an increased fibrillar overlap and increased population of confined water molecules monitored by STD NMR. By comparison, cationic cellulose nanofibrils (produced by reaction of cellulose with trimethylglycidylammonium chloride) were found to be heat-unresponsive.

      Item Type: Article
      Uncontrolled Keywords: water confinement,hydrogel,tempo oxidised cellulose,heat induced gelation,saturation transfer difference nmr,saxs,rheology
      Faculty \ School: Faculty of Science > School of Pharmacy
      Related URLs:
      Depositing User: LivePure Connector
      Date Deposited: 25 Sep 2018 10:30
      Last Modified: 01 Feb 2019 04:30
      URI: https://ueaeprints.uea.ac.uk/id/eprint/68341
      DOI: 10.1016/j.jcis.2018.09.085

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