Saud, S. N. and Raheleh Hosseinian, S. and Bakhsheshi-Rad, H. R. and Yaghoubidoust, F. and Iqbal, N. and Hamzah, E. and Ooi, C. H. R. (2016) Corrosion and bioactivity performance of graphene oxide coating on Ti-Nb shape memory alloys in simulated body fluid. Materials Science and Engineering C, 68 . pp. 687-694. ISSN 0928-4931
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Abstract
In the present work, the microstructure, corrosion, and bioactivity of graphene oxide (GO) coating on the laser-modified and -unmodified surfaces of Ti-Nb shape memory alloys (SMAs) were investigated. The surface morphology and chemical composition was examined using field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD). The surface modification was carried out via a femtosecond laser with the aim to increase the surface roughness, and thus increase the adhesion property. FE-SEM analysis of the laser-treated Ti-30 at.% Nb revealed the increase in surface roughness and oxygen/nitrogen containing groups on the Ti-30 at.% Nb surface after being surface modified via a femtosecond laser. Furthermore, the thickness of GO was increased from 35 μm to 45 μm after the surface was modified. Potentiodynamic polarisation and electrochemical impedance spectroscopy studies revealed that both the GO and laser/GO-coated samples exhibited higher corrosion resistance than that of the uncoated Ti-Nb SMA sample. However, the laser/GO-coated sample presented the highest corrosion resistance in SBF at 37 °C. In addition, during soaking in the simulated body fluid (SBF), both the GO and laser/GO coating improved the formation of apatite layer. Based on the bioactivity results, the GO coating exhibited a remarkable antibacterial activity against gram-negative bacteria compared with the uncoated. In conclusion, the present results indicate that Ti-30 at.% Nb SMAs may be promising alternatives to NiTi for certain biomedical applications.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Bacteria, Bioactivity, Body fluids, Coatings, Corrosion, Corrosion resistance, Electrochemical impedance spectroscopy, Enamels, Field emission microscopes, Graphene, Medical applications, Niobium oxide, Phosphate minerals, Protective coatings, Scanning electron microscopy, Shape memory effect, Surface roughness, Surface treatment, Titanium alloys, Ultrashort pulses, X ray diffraction, Adhesion properties, Anti-bacterial activity, Biomedical applications, Chemical compositions, Field emission scanning electron microscopy, Gram-negative bacteria, Graphene oxides, Simulated body fluids, Titanium oxides, alloy, biocompatible coated material, graphite, niobium, titanium, body fluid, chemistry, corrosion, Gram negative bacterium, growth, development and aging, human, molecular imprinting, Alloys, Body Fluids, Coated Materials, Biocompatible, Corrosion, Gram-Negative Bacteria, Graphite, Humans, Molecular Imprinting, Niobium, Titanium |
| Subjects: | T Technology > TJ Mechanical engineering and machinery |
| Divisions: | Mechanical Engineering |
| ID Code: | 71964 |
| Deposited By: | Fazli Masari |
| Deposited On: | 20 Nov 2017 08:18 |
| Last Modified: | 20 Nov 2017 08:18 |
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