Figure 1.

Coaxial electrospinning: (a) Schematic diagram of the process; the inset shows the nozzle of the homemade concentric spinneret; (b) Digital image showing the apparatus arrangement; (c) Connection between the power supply and the spinneret; (d) A typical fluid jet trajectory; the inset division of fluid jets is a result of a higher applied voltage of 16 kV; (e) A typical compound Taylor cone of the core/sheath fluids. Under a voltage of 14 kV and a collected distance of 20 cm with the flow rate of the sheath and core fluids are 1 and 0.7 mL/h, respectively, for the preparation of nanofibre F3.