Fabrication of BaTiO3 films on titanium by microarc oxidation method and improvement of bioactivity by electric poling treatment |
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Authors: | Ho-Jun Song Yeong-Joon Park |
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Affiliation: | Department of Dental Materials and Dental Materials Research Institute, School of Dentistry, Chonnam National University, Gwangju 500-757, South Korea |
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Abstract: | A microarc oxidation (MAO) method was used to deposit a ferroelectric BaTiO3 (BTO) film on titanium implant metal. The bioactivity of the sample was enhanced by negatively polarizing the film surface. BTO-1 and BTO-2 sample groups were fabricated by applying a constant AC current of 1.2 A/cm2 (900 s) and 2.0 A/cm2 (600 s), respectively. The BTO film surface was negatively polarized using a high temperature poling treatment. The bioactivity of the non-polarized BTO and polarized BTO films was compared using an immersion test in Eagle's Minimum Essential Medium (MEM). For both groups, 0.5-2 μm diameter pores were evenly distributed over the BTO film surface fabricated using the MAO method. The crystallinity and film-to-substrate bond strength of the BTO-2 film were higher than those of the BTO-1 film. The in vitro MEM immersion test demonstrated more calcium phosphate deposition on the negatively polarized BTO film than on the non-polarized BTO film. |
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Keywords: | BaTiO3 Microarc oxidation Titanium Bioactivity Ferroelectrics Adhesion |
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