BIOMIMETIC DEPOSITION OF APATITE ON SURFACE CHEMICALLY MODIFIED POROUSNiTiSHAPEMEMORY ALLOY

S. L. Wu, X. M. Liu, C. Y. Chung (), Paul K. Chu, Y. L. Chan, K. W. K. Yeung and C. L. Chu
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S. L. Wu: Department of Physics & Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
X. M. Liu: Department of Physics & Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
C. Y. Chung: Department of Physics & Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
Paul K. Chu: Department of Physics & Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
Y. L. Chan: Division of Spine Surgery, Department of Orthopaedics and Traumatology, The University of Hong Kong, Pokfulam, Hong Kong
K. W. K. Yeung: Division of Spine Surgery, Department of Orthopaedics and Traumatology, The University of Hong Kong, Pokfulam, Hong Kong
C. L. Chu: School of Materials Science and Engineering, Southeast University, Nanjing 210018, China

Surface Review and Letters (SRL), 2008, vol. 15, issue 01n02, 97-104

Abstract: PorousNiTishape memory alloy (SMA) with 48% porosity and an average pore size of 50–800 μm was synthesized by capsule-free hot isostatic pressing (CF-HIP). To enhance the surface bioactivity, the porousNiTiSMA was subjected toH2O2and subsequentNaOHtreatment. Scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy analyses revealed that a porous sodium titanate (Na2TiO3) film had formed on the surface of the porousNiTiSMA. An apatite layer was deposited on this film after immersion in simulated body fluid at 37°C, while no apatite could be found on the surface of the untreated porousNiTiSMA. The formation of the apatite layer infers that the bioactivity of the porousNiTiSMA may be enhanced by surface chemical treatment, which is favorable for its application as bone implants.

Keywords: PorousNiTi; shape memory alloy; surface modification; apatite; bioactivity; biomimetic (search for similar items in EconPapers)
Date: 2008
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DOI: 10.1142/S0218625X08011044

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