Figure 4. SEM images of solvent-induced crystallization of polycarbonate using either pure aceteone or an optimized acetone–NP mixture.

(a) For pure acetone, the resulting surface contains good coverage of nanostructures atop micron-sized mounds. (b) For the actone–NP mixture, the nanostructures are limited to discrete micron-sized spherulites due to the nanoparticle aggregates acting as nucleation sites for the polycarbonate crystallization.