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. 2018 Apr 19;3(4):4342–4351. doi: 10.1021/acsomega.8b00219

Figure 5.

Figure 5

High-resolution XPS spectra of a 3D printed nylon-12 tablet treated with a 50:50 mixture of titanium(IV) butoxide and TEOS. (a) Ca 2p spectrum showing the sample before (bottom) and after (top) stem cell differentiation. Binding energy values of 347.2 eV for the Ca 2p3/2 and 352.7 eV for Ca 2p1/2 are in good agreement with the literature for hydroxyapatite (Ca10(PO4)6(OH)2) (60). (b) Corresponding P 2p spectrum with binding energy values of 133.1 eV (P 2p3/2) and 133.9 (P 2p1/2). (c) Si 2p high-resolution scan for the titanium(IV) butoxide and TEOS-treated tablet before (bottom) and after cell differentiation (top). The lower signal obtained after differentiation is attributed to the overgrowth of hydroxyapatite onto the substrate. (d) Ti 2p high-resolution spectra before (bottom) and after (top) cell differentiation.