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SEM of the pure 2 wt % chitosan at 1000× (a) and 2000× magnifications (b) and the chitosan–gelatin–ferulic acid (1:1 g; r = 0.5, 3 mM ferulic acid) blended films/membranes using 1 wt % acetic acid solvent at 1000× (c) and 2000× magnifications (d).
