Fig. 3From: Alkali-activation of cellulose nanofibrils to facilitate surface chemical modification under aqueous conditionsFT-IR spectra of cellulose nanofibrils derivatized through carboxymethylation after alkali-activation with different NaOH concentrations. NaOH concentrations: a 0.0 wt%, b 1.0 wt%, c 3.0 wt%, d 5.0 wt% and e 7.0 wt%, corresponding to Fig. 1bBack to article page