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Coupled Effects of Fibril Width, Residual and Mechanically-Liberated Lignin on the Flow, Viscoelasticity and Dewatering of Cellulosic Nanomaterials.
Biomacromolecules 2020 August 14
The rheological behaviour of aqueous suspensions of lignocellulose nanofibrils (LCNF) is investigated systematically by considering the coupled effect of residual lignin and LCNF morphology. The LCNF was obtained by high-energy fluidisation of TEMPO oxidised mechanical fibres followed by size fractionation (fibril width of ~5, ~9, and ~18 nm). Nanofibril width and corresponding fibril-fibril interactions are strongly influenced by the presence and distribution of lignin in the respective fractions, either retained on the fibril surface or as free structures present in the finest size fraction. All samples containing lignin display dilatancy, typifying gel suspensions with aggregated hydrophobic particles. Fine fractionated samples display strong gel behaviour. The coarse fractionated sample, by contrast, shows a greater tendency to flocculate via entanglement and displays less gel-like characteristics, hence it dewaters more freely.
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