**2.1 Materials**

Electrospinning solutions were prepared by dissolving PVDF powder (Arkema Inc., Exton, PA, USA, Kynar® 761 grade resin with molecular weight of 500,000 g/gmol and density of 1.78 g/m3 ) in co-solvents N-N-Dimethylformamide (DMF) and acetone (Sigma Aldrich, St. Louis, MO, USA). These materials were used in making the solutions without further purification.
