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(A) Schematic illustration of the setup for coaxial electrospinning; (B, C) SEM images of TiO2 hollow nanofibers; (D) experimental setup used for coaxial electrospinning of core/sheath nanofibers. In this installation with a non-conductive spinneret and needle, unlike the traditional approach, a high voltage is applied directly to the solution using a special electrode. (A–C) Reprinted with permission from [55]. Copyright 2004: Wiley; (D) Reprinted from [56]. Copyright 2003 Wiley.
