Biomimetic apatite induction on Ca-containing titania |
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| Institution: | 1. Department of Dental Technology and Materials Science, Central Taiwan University of Science and Technology, Taiwan, ROC;2. Institute of Biomedical Engineering and Materials Science, Central Taiwan University of Science and Technology, Taiwan, ROC;3. Department of Mechanical and Automation Engineering, Da-Yeh University, Taiwan, ROC;4. Department of Chemical and Materials Engineering, National University of Kaohsiung, Kaohsiung, Taiwan, ROC;1. School of Chemical Engineering, University of Birmingham, Edgbaston, B15 2TT, UK;2. School of Applied Sciences, University of Huddersfield, Huddersfield HD1 3DH, UK |
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| Abstract: | To understand the apatite induction mechanism in SBF, Ca-containing titania film without CaTiO3 phase was fabricated by micro-arc oxidation (MAO) at low voltage (230 V) in an electrolytic solution containing calcium acetate monohydrate. Macro-porous, Ca-containing titania film was formed on the titanium substrate and the oxidized layer was composed of anatase and rutile phase. When immersed in 1.5SBF, no apatite was induced in the MAO specimen similar to the CaTiO3-containing titania. However, after hydrothermal treatment at 250 °C for 2 h, numerous precipitates, presumably calcium phosphates, were formed on the surface of the titania after 7 day immersion and titania surface was entirely covered with apatite after 14 days of immersion. This study clearly showed that Ca-containing titania has the capability to induce apatite in SBF and hydrothermal treatment plays a decisive role in apatite induction, particularly producing surface hydroxyl groups such as Ca–OH or Ti–OH. |
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