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SEM cross section images of the neat PAM films (a–c), and the composite films PAM/CNC-10 (d–f), PAM/CNC-30 (g–i), PAM/CNC-50 (j–l) cast from solutions with pH ≤ 3 (left column), pH 6 (middle column), and pH ≥ 10 (right column). The scale bar is 1 μm.
