To confirm the effects of plasma treatment, trypan blue solution was dropped onto the PLLA scaffold: (a) untreated PLLA scaffold, (b) 10 min plasma-treated PLLA scaffold.
SEM images of PLLA electrospun scaffold. (a), (e) untreated scaffold; (b), (f) 30 s plasma-treated scaffold; (c), (g) 5 min plasma-treated scaffold; and (d), (h) 10 min plasma-treated scaffold.
XPS spectra of (a) untreated PLLA scaffold and (b) 10 min He-APGD plasma treated PLLA scaffold.
Confocal microscopy images of PLLA electrospun scaffold. (a) Untreated scaffold, (b) 30 s plasma-treated scaffold, (c) 5 min plasma-treated scaffold, (d) 10 min plasma-treated scaffold (x-axis: 1.2 mm, y-axis: 1.2 mm, z-axis: 600 μm).
Potential nitrogen grafting reactions occurring in the PLLA scaffold with helium gaseous atmospheric pressure plasma treatment.
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