A Facile Approach for the Mass Production of Submicro/Micro Poly (Lactic Acid) Fibrous Mats and Their Cytotoxicity Test towards Neural Stem Cells

Figure 6

Representative SEM images of electrospun PLA (10% (w/v)), obtained in various rotating drum speeds in the machine direction (MD); transverse direction (TD) is constant at 0.3 m/min, ; is the number of analyses.

(a) Collector speed: 0 m/s

(b) Collector speed: 2.25 m/s

(c) Collector speed: 3.6 m/s

(d) Collector speed in machine direction (MD) (m/s)