Figure 7

(a) FTIR-ATR of selected BL-CNSs prepared from BLs of pulping agents NaOH (BL1-CNSs), M-NaOH-AQ-BH (BL5-CNSs) and KOH/NH₄OH (BL6-CNSs). (b) FTIR-ATR of selected BL-CNSs prepared from BLs of pulping agents, NaOH-Na₂S, (BL7-CNSs), Na₂SO₃/Na₂CO₃, (BL8-CNSs) and Na₂SO₃ (BL9-CNSs).