Fig. 3.

Scanning electron microscope images of chitosan and PVA blended electrospun fibers at a magnification of x10000. Chitosan and PVA were dissolved in formic acid at 7% w/w and in distilled water at 9% w/w, respectively. The two solutions were mixed and electrospun in the indicated chitosan: PVA specified volume ratios of 50:50 (A), 30:70 (B) and 0:100 (C). Electrospun fibers made of a mixture of chitosan dissolved in formic acid (or 0.2 ​M acetic acid) at 2% w/w and mixed with a solution of 9% w/w PVA in a volume ratio of 50:50 (D). Adapted with permission from Ref. [69]. Copyright 2004 Elsevier.