title: Effect of surface modification by nitrogen ion implantation on the electrochemical and cellular behaviors of super-elastic NiTi shape memory alloy.
abstract: The aim of this investigation was to enhance the biological behavior of NiTi shape memory alloy while preserving its super-elastic behavior in order to facilitate its compatibility for application in human body. The surfaces of NiTi samples were bombarded by three different nitrogen doses. Small-angle X-ray diffraction was employed for evaluating the generated phases on the bombarded surfaces. The electrochemical behaviors of the bare and surface-modified NiTi samples were studied in simulated body fluid (SBF) using electrochemical impedance and potentio-dynamic polarization tests. Ni ion release during a 2-month period of service in the SBF environment was evaluated using atomic absorption spectrometry. The cellular behavior of nitrogen-modified samples was studied using fibroblast cells. Furthermore, the effect of surface modification on super-elasticity was investigated by tensile test. The results showed the improvement of both corrosion and biological behaviors of the modified NiTi samples. However, no significant change in the super-elasticity was observed. Samples modified at 1.4E18 ion cm(-2) showed the highest corrosion resistance and the lowest Ni ion release.
authors: Research Center for Advanced Materials and Mineral Processing, Faculty of Materials Engineering, Sahand University of Technology, P.O. Box: 51335-11996, Tabriz, Iran, h_maleki@sut.ac.ir.
authors: H
authors: H
authors: Maleki-Ghaleh
authors: J
authors: J
authors: Khalil-Allafi
authors: M
authors: M
authors: Sadeghpour-Motlagh
authors: M S
authors: MS
authors: Shakeri
authors: S
authors: S
authors: Masoudfar
authors: A
authors: A
authors: Farrokhi
authors: Y
authors: Y
authors: Beygi Khosrowshahi
authors: A
authors: A
authors: Nadernezhad
authors: M H
authors: MH
authors: Siadati
authors: M
authors: M
authors: Javidi
authors: M
authors: M
authors: Shakiba
authors: E
authors: E
authors: Aghaie
mesh_terms: D000818:Animals; D001672:Biocompatible Materials / Q000138:chemical synthesis* / Q000528:radiation effects; D001826:Body Fluids / Q000737:chemistry*; D002460:Cell Line; D049109:Cell Proliferation / Q000502:physiology; D002470:Cell Survival / Q000502:physiology; D005347:Fibroblasts / Q000166:cytology* / Q000502:physiology*; D020450:Heavy Ions; D008422:Materials Testing; D051379:Mice; D009532:Nickel / Q000737:chemistry* / Q000528:radiation effects; D009584:Nitrogen; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D001672:Biocompatible Materials; C040654:titanium nickelide; D009532:Nickel; D014025:Titanium; D009584:Nitrogen