Dispersibility and Stability Studies of Cellulose Nanofibers: Implications for Nanocomposite Preparation

摘要

Physical properties of nanocomposites has been enhanced by achieving stable CNF suspension in organic solvent without the use of surfactants or large energy input. In this study, after freeze drying rice straw (RS) derived CNF has been successfully dispersed in solvents including DMSO dimethyl sulfoxide, H2O and DMSO/H2O. The concentration of CNF and solvent ratio was optimized and analyzed by high resolution transmission electron microscopy, HR-TEM and Zetasizer. It was found that average diameter of CNF is 8.3 nm in binary solvent mixture of DMSO/ H2O (80:20), whereas in pure water (40.3 nm) under the same sonication treatment conditions. Zeta potential value was reduced from (- 55 mV) in pure water to (- 45 mV) in DMSO/Water mixture showing better stability and it was also verified by sedimentation studies. Around 70% transparency of CNF was achieved in co-solvent mixture that can be utilized for nancomposite film fabrication. The fact that CNF can be well dispersed in organic solvents opens up new opportunities for blending of CNF-polymer matrix in coating and packaging applications.[GRAPHICS].