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Appearance of CNC suspensions after oxidation using the APS method with different oxidation times. (A) Balsa, 8 h oxidation; (B) balsa, 12 h oxidation; (C) balsa, 16 h oxidation; (D) kapok, 8 h oxidation; (E) kapok, 12 h oxidation, and (F) kapok, 16 h oxidation.
