TEMPO-oxidised cellulose nanofibrils; probing the mechanisms of gelation via small angle X-ray scattering

Physical Chemistry Chemical Physics : PCCP
Julien SchmittKaren J Edler

Abstract

The structure of dispersions of TEMPO-oxidised cellulose nanofibrils (OCNF), at various concentrations, in water and in NaCl aqueous solutions, was probed using small angle X-ray scattering (SAXS). OCNF are modelled as rod-like particles with an elliptical cross-section of 10 nm and a length greater than 100 nm. As OCNF concentration increases above 1.5 wt%, repulsive interactions between fibrils are evidenced, modelled by the interaction parameter νRPA > 0. This corresponds to gel-like behaviour, where G' > G'' and the storage modulus, G', shows weak frequency dependence. Hydrogels can also be formed at OCNF concentration of 1 wt% in 0.1 M NaCl(aq). SAXS patterns shows an increase of the intensity at low angle that is modelled by attractive interactions (νRPA < 0) between OCNF, arising from the screening of the surface charge of the fibrils. Results are supported by ζ potential and cryo-TEM measurements.

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Citations

Nov 13, 2018·Soft Matter·Marcelo A da SilvaKaren J Edler
Jun 4, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·James C CourtenayJanet L Scott
Jun 15, 2021·Journal of Colloid and Interface Science·Vincenzo CalabreseAmy Q Shen
Feb 28, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Pascal BertschPeter Fischer
Apr 17, 2020·ACS Applied Polymer Materials·Vincenzo CalabreseKaren J Edler
Jan 28, 2020·Biomacromolecules·Rinat NigmatullinStephen J Eichhorn

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Methods Mentioned

BETA
rheology
X-ray
AFM

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