STUDY OF NICKEL ION RELEASE IN SIMULATED BODY FLUID FROM C+-IMPLANTED NICKEL TITANIUM ALLOY

Muhammad Ahsan Shafique, G. Murtaza, Shahzad Saadat, Zeeshan Zaheer, Muhammad Shahnawaz, Muhammad K. H. Uddin and Riaz Ahmad
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Muhammad Ahsan Shafique: Centre for Advanced Studies in Physics, GC University, Lahore, Pakistan†Department of Physics, GC University, Lahore, Pakistan
G. Murtaza: Centre for Advanced Studies in Physics, GC University, Lahore, Pakistan
Shahzad Saadat: Centre for Advanced Studies in Physics, GC University, Lahore, Pakistan
Zeeshan Zaheer: Centre for Advanced Studies in Physics, GC University, Lahore, Pakistan
Muhammad Shahnawaz: Centre for Advanced Studies in Physics, GC University, Lahore, Pakistan
Muhammad K. H. Uddin: #x2021;Department of Materials Science and Engineering, Kroto Research Institute, University of Sheffield, Sheffield S3 7HQ, UK
Riaz Ahmad: Centre for Advanced Studies in Physics, GC University, Lahore, Pakistan

Surface Review and Letters (SRL), 2016, vol. 23, issue 05, 1-6

Abstract: Nickel ion release from NiTi shape memory alloy is an issue for biomedical applications. This study was planned to study the effect of C+ implantation on nickel ion release and affinity of calcium phosphate precipitation on NiTi alloy. Four annealed samples are chosen for the present study; three samples with oxidation layer and the fourth without oxidation layer. X-ray diffraction (XRD) spectra reveal amorphization with ion implantation. Proton-induced X-ray emission (PIXE) result shows insignificant increase in Ni release in simulated body fluid (SBF) and calcium phosphate precipitation up to 8×1013ions/cm2. Then Nickel contents show a sharp increase for greater ion doses. Corrosion potential decreases by increasing the dose but all the samples passivate after the same interval of time and at the same level of VSCE in ringer lactate solution. Hardness of samples initially increases at greater rate (up to 8×1013ions/cm2) and then increases with lesser rate. It is found that 8×1013ions/cm2 (≈1014) is a safer limit of implantation on NiTi alloy, this limit gives us lesser ion release, better hardness and reasonable hydroxyapatite incubation affinity.

Keywords: Surface modification; nitinol; carbon ions; hardness; ion release; PIXE (search for similar items in EconPapers)
Date: 2016
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DOI: 10.1142/S0218625X16500451

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