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. 2018 Jun 19;10(6):680. doi: 10.3390/polym10060680

Figure 7.

Figure 7

Scanning electron microscope images of centrifugally spun of rPET fibers prepared using needles with various inner diameters: (a) 160 μm; (b) 260 μm; and (c) 340 μm. Centrifugal spinning condition: polymer solution concentration, 10 wt %; rotation speed, 15,000 rpm; collection distance, 10 cm.