2007 Fiscal Year Final Research Report Summary
Biomaterial nano-particles development by low voltage electrolysis with polarity inversion
| Project/Area Number |
18592116
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
補綴理工系歯学
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| Research Institution | Niigata University |
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Principal Investigator |
OKAWA Seigo Niigata University, Institute of Medicine and Dentistry, Assistant Professor (80143791)
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| Co-Investigator(Kenkyū-buntansha) |
KANATANI Mitsugu Niigata University, Institute of Medicine and Dentistry, Assistant Professor (40177499)
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| Project Period (FY) |
2006 – 2007
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| Keywords | Biomaterial / Nano-material / Calcium phosphate / Valve metal / Anodic oxidation |
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| Research Abstract |
In order to make a calcium phosphate compound with nano-size on valve metals such as Ta, Nb, and Zr, electrochemical deposition of calcium phosphate on different metals was performed by anodic oxidation with alternate polarity inversion at an applied 20 VDC. A saturated hydroxyapatite (HAP)-phosphoric acid solution (pH 3) was used as the electrolyte. FTIR, XRD, and XPS were employed to investigate the detailed characteristics of the deposition. HAP was precipitated on Ta; HAP including brushite and monetite on Nb; and HAP and monetite on Zr. The Ca/P atomic ratios were 1.3-1.5 by XPS, and HPO42- bands were detected on Ta by FTIR. Therefore, the HAP precipitated on Ta was a Ca-deficient HAP. In addition, the XPS spectra of the specimens showed that phosphate ions were incorporated into the anodic oxide film. Deposits with nano-grain size were observed by AFM, and their morphologies depended on the surface characteristics of the valve metal. The results confirmed that anodic oxidation with polarity inversion was effective in accelerating the deposition of calcium phosphate with nano-grain size on valve metals. Such valve metals having this characteristic should be potentially bioactive.
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