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Images obtained by SEM (a–c), optical (gray) (d–f) and reflected (blue) (g–k) microscopy for pure PLLA (a,d,g), and its composites with neat CNC (15 wt%) (b,e,h), and CNC modified with poly(glutamic acid) (15 wt%) (c,f,k) (reproduced from [230] under the terms of the Creative Commons CC BY license).
