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SEM morphology of chitosan/NaCS films prepared with different mass ratios. Mass ratios of chitosan to NaCS of (a) 1:4; (b) 1:2; (c) 3:4 and (d) 1:1. Chitosan with molecular weight 563.3 kDa and NaCS with molecular weight 710.8 kDa were used. Modified and cited from Zhu et al. [64].
