TY - GEN
T1 - UV-Irradiation modifies chemistry of anatase layer associated with in vitro apatite nucleation
AU - Uetsuki, Keita
AU - Nakai, Shinsuke
AU - Shirosaki, Yuki
AU - Hayakawa, Satoshi
AU - Osaka, Akiyoshi
PY - 2013/4/8
Y1 - 2013/4/8
N2 - Anatase layer was derived on pure titanium substrates by the H 2O2 treatment and calcination, on which UV was irradiated in air (UVa) and in ultra pure water (UVw). The effects of the UV irradiation on in vitro apatite formation in Kokubo's simulated body fluid were interpreted in terms of the modified chemistry of the anatase layer. The UVa treatment reduced apatite formation while the contrary effects were observed for the UVw treatment. From Ols X-ray photoelectron spectroscopic (XPS) analysis, those results were correlated to the change in the relative amount of Ti-OH (basic TiOH) and Ti-O(H)-Ti (acidic Ti-OH). Combining the XPS analysis and the apatite growth characteristics, i.e., the number and size of the semi-spherical particles and their surface-coverage, derived a plausible model: proper assembly of those sites (Ti-OH and Ti-O(H)-Ti) that collect both calcium and phosphate ions together should only give rise to induction of apatite nucleation.
AB - Anatase layer was derived on pure titanium substrates by the H 2O2 treatment and calcination, on which UV was irradiated in air (UVa) and in ultra pure water (UVw). The effects of the UV irradiation on in vitro apatite formation in Kokubo's simulated body fluid were interpreted in terms of the modified chemistry of the anatase layer. The UVa treatment reduced apatite formation while the contrary effects were observed for the UVw treatment. From Ols X-ray photoelectron spectroscopic (XPS) analysis, those results were correlated to the change in the relative amount of Ti-OH (basic TiOH) and Ti-O(H)-Ti (acidic Ti-OH). Combining the XPS analysis and the apatite growth characteristics, i.e., the number and size of the semi-spherical particles and their surface-coverage, derived a plausible model: proper assembly of those sites (Ti-OH and Ti-O(H)-Ti) that collect both calcium and phosphate ions together should only give rise to induction of apatite nucleation.
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M3 - Conference contribution
AN - SCOPUS:84875754476
SN - 9781118205969
T3 - Ceramic Engineering and Science Proceedings
SP - 79
EP - 84
BT - Advances in Bioceramics and Porous Ceramics V - A Collection of Papers Presented at the 36th International Conference on Advanced Ceramics and Composites, ICACC 2012
T2 - Advances in Bioceramics and Porous Ceramics V - 36th International Conference on Advanced Ceramics and Composites, ICACC 2012
Y2 - 22 January 2012 through 27 January 2012
ER -