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(a–c) Optical micrographs and (d–f) SEM images of particles prepared at different polymer concentrations. ((a) 2 wt% PCL, (b) 5 wt% PCL, and (c) 10 wt% PCL), flow rate = 10 µl min−1, collecting distance = 150 mm, voltage approximately 10 kV. Scale bars, (a,b) 3 µm; (c) 20 µm.
