Mohammad Hossein Ghanian - Biomaterials Department, Iran Polymer and Petrochemical Institute, Tehran, Iran.
Jalal Barzin - Biomaterials Department, Iran Polymer and Petrochemical Institute, Tehran, Iran.
Mojgan Zandi - Biomaterials Department, Iran Polymer and Petrochemical Institute, Tehran, Iran.
Morteza Ehsani - Biomaterials Department, Iran Polymer and Petrochemical Institute, Tehran, Iran.

Poly(ε-caprolactone) (PCL) is a common polymer used for fabrication of electrospun fibers due to its good spinability, biocompatibility, slow biodegradation and low cost. However,electrospun PCL fibers usually exhibit a wide range of fiber diameters in a typical preparation. Therefor a methodologythat can easily control fiber diameter and distribution is urgently needed. Fiber diameter can be controlled by polymer solution properties such as concentration, surface tension, andconductivity. The latter is a crucial parameter for FDD and can be controlled by charged additives [1].