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Different approaches to prepare electrospun nanofibers: (a) conventional approach, (b,e) obtaining aligned electrospun nanofibers (b) by a high-speed rotating drum and (e) by a sharp-edged rotating disk; (c,d) SEM images of (c) random and (d) aligned nanofibers. (a-d) Reprinted with permission from [96]. Copyrights 2013 Wiley; (e) Reprinted with permission from [97]. Copyright 2001 IOP.
