Figure 1.

Field emission scanning electron microscopy images of the carvedilol-eudragit^® RS100 electrosprayed nanosystems with (a) drug: polymer ratio of 1:5 at the total solution concentration of 10 % w/v (Magnification: ×100 k), (b) 1:5-15 % w/v (×50 k), (c) 1:5-20 % w/v (×70 k), (d) 1:10-10 % w/v (×70 k), (e) 1:10-15 % w/v (×50 k) and (f) 1:10-20 % w/v (×40 k)