Currently I am doing near field (SOD- 10mm) electrospinning of PCL with DMF and the concentration is 70% (14gm PCL dissolve in 20gm DMF). But my fibers are breaking. The SOD is now 10mm, applied voltage is 3.5kV. What is the solution? Is there any one have done with solvent DMF? Could you please suggest me any paper regarding to this situation?