495708.fig.004a
(a)
495708.fig.004b
(b)
495708.fig.004c
(c)
495708.fig.004d
(d)
Figure 4: SEM micrographs of (a) nHAP particles used to fabricate ES scaffold (scale bar: 600 nm), (b) nHAP-PCL(ES) region, with arrows showing incorporated nHAP partially exposed on the surface of fibers (scale bar: μm), (c) nHAP-PCL(SBF) region, with arrows showing mineral crystallites (grown from ) decorating fibers (scale bar: 10 μm), and (d) PUR(SBF) region, with arrows showing mineral crystallites (grown from ) decorating fibers (scale bar: 10 μm) [73].