Figure 1.

High magnification FE-SEM images of electrospun polyurethane nanofibers containing different concentration of CaCl2 salt before incubation in SBF solution (a1) 0, (b1) 1, (c1) 1.5 and (d1) 2 wt% and the corresponding EDX spectra (a2)–(d2), respectively.

Nirmala et al. Nanoscale Res Lett 2011 6:2   doi:10.1007/s11671-010-9737-4