inacetic anhydride (1:20 by weight) and 5 wt% pyridine as catalyst,were refluxed at 100◦C for 4 h. At the end of the reaction, the treatedCNFs were extracted using distilled water (2:1 by volume) for 6 hin order to remove un-reacted acetic anhydride and acetic acid by-products. Finally, four cycles of solvent exchange was performed bycentrifugation to obtain aqueous dispersions of acetylated CNFs