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Schematic representation of the electrospinning procedure for the bundle production: (A) 2,500 rpm; (B) 1,750 rpm; and (C) 1,000 rpm. (I) Mats of nanofibers were electrospun on the rotating drum collector at different speeds. (II) The mats were cut in stripes and rolled on the drum and (III) pulled off the drum obtaining ring-shaped bundles.
