Electrochemical and XPS studies of titanium for biomaterial applications with respect to the effect of hydrogen peroxide

✍ Scribed by Pan, J. ;Thierry, D. ;Leygraf, C.

• Publisher: John Wiley and Sons
• Year: 1994
• Tongue: English
• Weight: 1007 KB
• Volume: 28
• Category: Article
• ISSN: 0021-9304
• DOI: 10.1002/jbm.820280115

✦ Synopsis

Electrochemical measurements, x-ray photoelectron spectroscopy, and scanning tunneling microscopy have been used to study the effect of hydrogen peroxide on the passivity of titanium in a phosphate-buffered saline (PBS) solution. The results indicate that the passive film formed in the PBS solution-with and without addition of H20z-may be described with a twolayer structure model. The inner layer has a structure close to TiOz whereas the outer layer consists of hydroxylated compounds. The introduction of H202 in the PBS solution broadens the hydroxylate-rich region, probably due to the formation of a Ti(IV)-H202 complex. Furthermore, the presence of HzOz results in enhanced dissolution of titanium and a rougher surface on a microscopic scale. Finally, a dark pigmentation (blue color) is observed when titanium has been exposed-for several weeks-to PBS with additions of H20z. @ 1994 John Wiley & Sons, Inc.