Figure 2

Photographs of the coaxial electrospinning setup and the optimization of parameters. (a) The apparatus used in this work, (b) the connection of the spinneret with the syringe pumps and power supply, (c) a typical coaxial process under an applied voltage of 15 kV with shell and core flow rates of 0.3 and 0.7 mL h⁻¹, respectively, (d) the divided electrospinning process which was observed at 17 kV, (e) FESEM images of the F1 nanofibers resulting from single-fluid electrospinning of the shell fluid alone, and (f) FESEM images of fibers (F3) generated in a coaxial process with shell and core flow rates of 0.4 to 0.6 mL h⁻¹, respectively.