The release of nickel from nickel-titanium (NiTi) is strongly reduced by a sub-micrometer thin layer of calcium phosphate deposited by rf-magnetron sputtering
| Autor: | Matthias Epple, E. V. Shesterikov, Roman A. Surmenev, Vladimir F. Pichugin, Thorsten Peitsch, M. A. Ryabtseva |
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| Rok vydání: | 2008 |
| Předmět: |
Calcium Phosphates
Materials science Scanning electron microscope Surface Properties Simulated body fluid Chemie Biomedical Engineering Biophysics chemistry.chemical_element Bioengineering engineering.material Sodium Chloride Biomaterials Coating Coated Materials Biocompatible X-Ray Diffraction Nickel Materials Testing Particle Size Titanium Aqueous solution Metallurgy Spectrometry X-Ray Emission Water Sputter deposition Electroplating chemistry Nickel titanium engineering Microscopy Electron Scanning Nuclear chemistry |
| Zdroj: | Journal of materials science. Materials in medicine. 21(4) |
| ISSN: | 1573-4838 |
| Popis: | Thin calcium phosphate coatings were deposited on NiTi substrates (plates) by rf-magnetron sputtering. The release of nickel upon immersion in water or in saline solution (0.9% NaCl in water) was measured by atomic absorption spectroscopy (AAS) for 42 days. The coating was analyzed before and after immersion by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). After an initial burst during the first 7 days that was observed for all samples, the rate of nickel release decreased 0.4-0.5 ng cm(-2) d(-1) for a 0.5 mum-thick calcium phosphate coating (deposited at 290 W). This was much less than the release from uncoated NiTi (3.4-4.4 ng cm(-2) d(-1)). Notably, the nickel release rate was not significantly different in pure water and in aqueous saline solution. |
| Databáze: | OpenAIRE |
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