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Preparation and images of the multilayer microspheres; (A, B) Schematics illustrating the synthetic procedure; (C) Digital photographs after (a) two, (b) four, (c) eight and (d) 12 alternating layers being deposited; (D) SEM images of particles coated with (a) two, (b) four, (c) eight and (d) 12 alternating layers; (E) TEM images of the PLGA microspheres (a) after synthesis and (b) after coating with eight alternating layers of PVA and p(AAPBA-co-NVCL).
