| Project/Area Number |
24656420
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Structural/Functional materials
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| Research Institution | Kansai University |
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Principal Investigator |
UEDA Masato 関西大学, 化学生命工学部, 准教授 (40362660)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2012: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 生体材料 / 機能切換え / 光照射 / 機能切り替え |
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| Research Abstract |
Hydroxyapatite (HAp) is known to precipitate on bioactive materials by soaking in simulated body fluid (SBF). The formation of HAp on TiO2 and ZrO2 surfaces under ultraviolet (UV) irradiation was investigated. HAp formation on ZrO2 surface was not sensitive to heat treatment and UV irradiation. In contrast, the HAp formation on the TiO2 in SBF was strongly influenced by heat treatments and UV irradiation. Hydroxyl group density on TiO2 surface could be decreased by the heat treatment. Then the density could be recovered by previous UV irradiation, it led to promotion of HAp formation. This means recovery of bioactivity on the TiO2 surface. The UV light produced electron-hole pairs in the TiO2, and the photogenerated holes that migrated to the surface repelled the positively charged ions in the solution. As a consequence, the continuous UV irradiation suppressed the formation of HAp. These results suggest that several functions in TiO2 might be switched by light irradiation.
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