Surface characterization and dissolution study of biodegradable calcium metaphosphate coated by sol-gel method

Title
Surface characterization and dissolution study of biodegradable calcium metaphosphate coated by sol-gel method
Author(s)
김석영Sunho Oh[Sunho Oh]Myung-Ho Han[Myung-Ho Han]Wan-Bin Im[Wan-Bin Im]Kyo Han Kim[Kyo Han Kim]Changkook You[Changkook You]Joo L. Ong[Joo L. Ong]
Keywords
TITANIUM IMPLANTS; HYDROXYLAPATITE; COATINGS
Issue Date
201003
Publisher
SPRINGER
Citation
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, v.53, no.3, pp.627 - 633
Abstract
Coatings of biomedical implant surfaces by a bioactive calcium phosphate film render bioactivity to the implant surface and shorten the healing time. In this present study, calcium metaphosphate (CMP) sol was synthesized by sol-gel method and coated onto the titanium alloys (Ti-6Al-4V). CMP sol was first synthesized by reacting Ca(NO(3))(2)4H(2)O (Sigma-Aldrich 99%, USA) with (OC(2)H(5))(3)P (Fluka 97%, Japan) in methyl alcohol. A stoichiometric Ca/P ratio of 0.5 was obtained by varying the amounts of the reactants. Sol was then coated on Ti-6Al-4V substrates by spin coating. The coated-specimens were then dried at 70 A degrees C for 24 h, followed by a heat treatment at 650 A degrees C for 1 h. Structural and chemical properties of the coatings were evaluated using XRD, SEM, and EPMA. The dissolution property of the coated-CMP layer was investigated by immersing the samples in the simulated body fluid (SBF) for 1, 3, 7 and 21 days. The concentration of Ca(2+) released was measured using ICP. After heat treatment, SEM indicated a smooth and uniform CMP layer, with CMP grains of approximately 100 nm. The CMP phase was identified with delta-CMP (JCPDS #9-363). After immersion in SBF, coatings were observed to be roughened and porous. The concentration of Ca(2+) in SBF was observed to increase over time, indicating continuous dissolution. The presence of titanium oxide phosphate compounds were also observed on CMP surfaces after immersion. It was thus concluded that the ability to control coating properties as well as the need for low heat treatment temperature offers advance for the use of CMP coating by sol-gel process on Ti-6Al-4V implant surfaces.
URI
http://hdl.handle.net/YU.REPOSITORY/22772http://dx.doi.org/10.1007/s10971-009-2141-9
ISSN
0928-0707
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공과대학 > 신소재공학부 > Articles
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