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. 2019 Dec 12;9(12):1769. doi: 10.3390/nano9121769

Figure 3.

Figure 3

XPS C1s spectra of as-prepared nanofibers (ac) and those after immersion in simulated body fluid (SBF) for 12 (d) and 72 h (e). PCL-ref (a), PCL–TiCaPCON (b), and PCL–COOH (ce).