Abstract
The surface properties of ion-beam sputter-deposited calcium phosphate (Ca-P) coatings on titanium (Ti) substrates were investigated using atomic force microscopy (AFM), Auger electron spectroscopy (AES), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy. The Ca-P coatings showed columnar growth with AFM. Although FTIR analyses revealed structural changes as a result of the coating process, negligible changes in the structural integrity of the coatings were observed after immersion in an alpha-modification of Eagle's Medium (α-MEM). This finding was confirmed by XPS and AES analyses, indicating constant binding and kinetic energies for P 2p and O 1s spectra, and O KLL and P LVV Auger lines, respectively, for all controls and samples immersed in α-MEM solutions. Although XPS analyses indicated no significant change in the P concentration, a reduction in the Ca concentration was observed, thereby resulting in a decrease in the Ca/P ratio from 2.3 to 1.5 after 12 days of immersion.
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