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SEM images showing the effect of individual factors on fiber diameter. (a) Low shellac content (35% w/w) with 4% w/w extract content at 16.5 kV and 0.8 mL/h; (b) high shellac content (45% w/w) with 4% w/w extract content at 16.5 kV and 0.8 mL/h; (c) low voltage (9 kV) with shellac-to-extract ratio (40:4) at 0.8 mL/h; and (d) high voltage (24 kV) with shellac-to-extract ratio (40:4) at 0.8 mL/h.
