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a) SEM and b) TEM images of the as-prepared PS hollow beads with holes on their surfaces. c) SEM and d) TEM images of the same batch of PS hollow beads where the holes had been partially closed by annealing the system in water at 95 °C for 5 min. e) SEM and f) TEM images of the same batch of PS hollow beads where the holes had been completely closed by annealing the system in water at 95 °C for 30 min.
