Figure 3.

SEM-EDX spectra of electrospun polyurethane nanofibers containing different concentration of CaCl2 salt after 7-day incubation in SBF solution (a) 0, (b) 1, (c) 1.5 and (d) 2 wt%.

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