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The present study concerns the chemical modification of the surfaces of cellulose nanofibrils (CNFs) prepared by aqueous counter collision (ACC). Wood-derived CNFs prepared by ACC were acetylated with acetic anhydride in an aqueous dispersion. The moderately acetylated nanofibrils were more readily dispersible in water than unmodified CNFs, although the original nanofibrous morphology comprising crystalline cellulose I remained almost unchanged. This indicates that the surfaces of the crystalline CNFs had been selectively acetylated, wh