The Effect of Water on Rheology of Native Cellulose/Ionic Liquids Solutions Behzad Nazari Nyalaliska W. Utomo Ralph H. Colby 10.1021/acs.biomac.7b00789.s001 https://acs.figshare.com/articles/journal_contribution/The_Effect_of_Water_on_Rheology_of_Native_Cellulose_Ionic_Liquids_Solutions/5346262 Cellulose coagulates upon adding water to its solutions in ionic liquids. Although cellulose remains in solution with much higher water contents, here we report the effect of 0–3 wt % water on solution rheology of cellulose in 1-butyl-3-methylimidazolium chloride and 1-ethyl-3-methylimidazolium acetate. Fourier transform infrared spectroscopy, thermal gravimetric analysis, and polarized light microscopy were also used to study water absorbance to the solutions. Tiny amounts of water (0.25 wt %) can significantly affect the rheological properties of the solutions, imparting a yield stress, while dry solutions appear to be ordinary viscoelastic liquids. The yield stress grows linearly with water content and saturates at a level that increases with the square of cellulose content. Annealing the solutions containing small amounts of water at 80 °C for 20 min transforms the samples to the fully dissolved “dry” state. 2017-08-09 00:00:00 20 min gravimetric analysis water content 1- butyl -3-methylimidazolium chloride Tiny amounts rheological properties study water absorbance 1- ethyl -3-methylimidazolium acetate water contents solution rheology light microscopy cellulose content