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Corrosion and bioactivity performance of graphene oxide coating on Ti-Nb shape memory alloys in simulated body fluid

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...

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Main Authors:	Saud, S. N., Raheleh Hosseinian, S., Bakhsheshi-Rad, H. R., Yaghoubidoust, F., Iqbal, N., Hamzah, E., Ooi, C. H. R.
Format:	Article
Published:	Elsevier Ltd 2016
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/71964/ https://www.scopus.com/inward/record.uri?eid=2-s2.0-84975127094&doi=10.1016%2fj.msec.2016.06.048&partnerID=40&md5=fbc1d655f74b2264e7393e21d1883e05
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spelling	my.utm.719642017-11-20T08:18:52Z http://eprints.utm.my/id/eprint/71964/ Corrosion and bioactivity performance of graphene oxide coating on Ti-Nb shape memory alloys in simulated body fluid Saud, S. N. Raheleh Hosseinian, S. Bakhsheshi-Rad, H. R. Yaghoubidoust, F. Iqbal, N. Hamzah, E. Ooi, C. H. R. TJ Mechanical engineering and machinery 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. Elsevier Ltd 2016 Article PeerReviewed 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 https://www.scopus.com/inward/record.uri?eid=2-s2.0-84975127094&doi=10.1016%2fj.msec.2016.06.048&partnerID=40&md5=fbc1d655f74b2264e7393e21d1883e05
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Saud, S. N. Raheleh Hosseinian, S. Bakhsheshi-Rad, H. R. Yaghoubidoust, F. Iqbal, N. Hamzah, E. Ooi, C. H. R. Corrosion and bioactivity performance of graphene oxide coating on Ti-Nb shape memory alloys in simulated body fluid
description	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.
format	Article
author	Saud, S. N. Raheleh Hosseinian, S. Bakhsheshi-Rad, H. R. Yaghoubidoust, F. Iqbal, N. Hamzah, E. Ooi, C. H. R.
author_facet	Saud, S. N. Raheleh Hosseinian, S. Bakhsheshi-Rad, H. R. Yaghoubidoust, F. Iqbal, N. Hamzah, E. Ooi, C. H. R.
author_sort	Saud, S. N.
title	Corrosion and bioactivity performance of graphene oxide coating on Ti-Nb shape memory alloys in simulated body fluid
title_short	Corrosion and bioactivity performance of graphene oxide coating on Ti-Nb shape memory alloys in simulated body fluid
title_full	Corrosion and bioactivity performance of graphene oxide coating on Ti-Nb shape memory alloys in simulated body fluid
title_fullStr	Corrosion and bioactivity performance of graphene oxide coating on Ti-Nb shape memory alloys in simulated body fluid
title_full_unstemmed	Corrosion and bioactivity performance of graphene oxide coating on Ti-Nb shape memory alloys in simulated body fluid
title_sort	corrosion and bioactivity performance of graphene oxide coating on ti-nb shape memory alloys in simulated body fluid
publisher	Elsevier Ltd
publishDate	2016
url	http://eprints.utm.my/id/eprint/71964/ https://www.scopus.com/inward/record.uri?eid=2-s2.0-84975127094&doi=10.1016%2fj.msec.2016.06.048&partnerID=40&md5=fbc1d655f74b2264e7393e21d1883e05
_version_	1643656324195549184
score	13.211869

Corrosion and bioactivity performance of graphene oxide coating on Ti-Nb shape memory alloys in simulated body fluid

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