Fig. 2. Morphological and structural characterization of unmodified and collagen modified electrospun PLLA scaffold. SEM micrographs depicting the morphological features of unmodified smooth and porous and collagen-modified smooth and porous electrospun scaffolds: (i–iii) SEM of unmodified smooth, 0.01% collagen-treated smooth scaffold and 0.1% collagen-treated smooth scaffold (scale bar = 1 μm); (iv–vi) SEM of unmodified porous (scale bar = 100 nm), 0.01% collagen-treated porous scaffold and 0.1% collagen treated porous scaffold (scale bar = 1 μm).