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50PEO20 – 3 wt% 20 wt% 2.2 Solution testing equipment A rotating viscometer (Brookfield, DV-II) was used for viscosity measurements of prepared solutions. Results were taken at the same shearing rates. The electric conductivity was tested with a conductivity meter (Mettler Toledo), at 22°C temperature and 35% relative humidity. The mean value of five measurements is presented as a result. 2.3 Electrospinning The photograph of conventional electrospinning setup used for production of nanofiber mats is shown in Figure 2 . The polymer solution was contained in a

-Development by Pressure 0/ Polar Electricity in Hemihedral Crystals with Inclined Faces , Acad. Sci.(Paris) C. R. Hebd. Seances, 91, 294 (in French). 5. Documentation for ANSYS, Coupled-Field Analysis Guide (2010). 6. Dunsch R., Breguet J.M. ( 2006), Unified mechanical approach to piezoelectric bender modelling, Sens. Actu. 134, 2, 436–446. 7. Fertis D.G. (1996), Advanced Mechanics of Structures , Marcel Dekker, New York. 8. Liu X., Wang X., Zhao H., Du Y. (2014), Myocardial cell pattern on piezoelectric nanofiber mats for energy harvesting, J. Phys: Conf. Ser . 557

, the surface charge density of the spinning jet increases, and finally, the fiber diameter decreases due to the increase in the splitting frequency of the jet. Figure 10 SEM images of PEO nanofiber mats fabricated by the CSBS system at the DC: (a) 5 cm, (b) 10 cm, (c) 15 cm, (d) 20 cm, and (e) 25 cm Figure 11 Relationship between DC and the fiber diameter 4.3 Effect of voltage on the nanofiber diameters Scanning electron microscopy images of CSBS fiber formations obtained at voltages of 4, 6, 8, 10, and 12 kV are shown in Figure 12 (a)–(e) , respectively. The