Figure 3.

Implementations of the three electrospinning processes for creating the three kinds of nanofibers: (a) An aerial view of the whole coaxial electrospinning apparatus with two pumps and a power supply. (b) The convergent point of two working fluids and electrostatic energy transferring. (c) A typical working process for preparing the homogeneous nanofibers F1 from the shell fluid with methylene blue as a color marker; the bottom inset is an image of the blue Taylor cone. (d) A typical working process for preparing the homogeneous nanofibers F2 from the core fluid; the bottom inset is an image of the transparent Taylor cone. (e) A typical working process for preparing the core–shell nanofibers F3; the bottom inset is a typical image of the compound core–shell Taylor cone.