Coupled Effects of Fibril Width, Residual and Mechanically Liberated Lignin on the Flow, Viscoelasticity, and Dewatering of Cellulosic Nanomaterials

Monireh Imani*, Katarina Dimic-Misic, Mehrnoosh Tavakoli, Orlando J. Rojas, Patrick A.C. Gane

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The rheological behavior of aqueous suspensions of lignocellulose nanofibrils (LCNFs) is investigated systematically by considering the coupled effect of residual lignin and LCNF morphology. The LCNF was obtained by high-energy fluidization of TEMPO-oxidized mechanical fibers, followed by size fractionation (fibril widths of ∼5, ∼9, and ∼18 nm). The nanofibril width and the 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 behavior. 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.

Original languageEnglish
Pages (from-to)4123-4134
Number of pages12
JournalBiomacromolecules
Volume21
Issue number10
DOIs
Publication statusPublished - 12 Oct 2020
MoE publication typeA1 Journal article-refereed

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