(a) Schematic illustration of the rotary cone electrospinning setup (inset: SEM image of collected PVP nanofibers, rotational speed of cone = 100 rpm, applied voltage = 30 kV, collecting distance = 20 cm, and solution throughput = 10 g/min), (b) diameter distribution of needle electrospun fibers, and (c) diameter distribution of rotary cone electrospun fibers [39].
