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Synthesis and biodegradation evaluation of nano-Si and nano-Si/TiO2 coatings on biodegradable Mg-Ca alloy in simulated body fluid

In the present study, nano-Si and nano-Si/TiO2 composite coatings have been successfully synthesized on the surface of Mg-1 wt%Ca alloy by the physical vapor deposition (PVD) method. The surface morphology and compositions of the coated specimens were characterized by X-ray diffraction (XRD), Fourie...

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Main Authors: Bakhsheshi Rad, Hamid Reza, Hamzah, Esah, Daroonparvar, Mohammadreza, Kasiri-Asgarani, Masoud, Medraj, Mamoun
Format: Article
Published: Elsevier 2014
Subjects:
TJ Mechanical engineering and machinery
Online Access:http://eprints.utm.my/id/eprint/62764/
http://dx.doi.org/10.1016/j.ceramint.2014.05.126
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spelling my.utm.627642017-06-07T07:44:59Z http://eprints.utm.my/id/eprint/62764/ Synthesis and biodegradation evaluation of nano-Si and nano-Si/TiO2 coatings on biodegradable Mg-Ca alloy in simulated body fluid Bakhsheshi Rad, Hamid Reza Hamzah, Esah Daroonparvar, Mohammadreza Kasiri-Asgarani, Masoud Medraj, Mamoun TJ Mechanical engineering and machinery In the present study, nano-Si and nano-Si/TiO2 composite coatings have been successfully synthesized on the surface of Mg-1 wt%Ca alloy by the physical vapor deposition (PVD) method. The surface morphology and compositions of the coated specimens were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), transmission election microscopy (TEM), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The results show the formation of thin and compact coating layers which homogeneously cover the surface of Mg alloy. Some micro-pores and micro-cracks were observed in the Si and Si/TiO2 films. It was also found that the Si and TiO2 nanoparticle had a spherical morphology with an average particle size of 30-40 nm and 70-80 nm, respectively. Electrochemical studies revealed that nano-Si/TiO2 coating offers a significant reduction in the corrosion rate (0.57 mm/year) compared to the Si coated (0.91 mm/year) and the uncoated alloys (6.21 nun/year) in simulated body fluid (SBF). Hydrogen evolution studies showed a lower degradation rate of nano-Si/TiO2 (1.57 mIkm(2)/day) than that of nano-Si coated alloy (2.22 ml/cm(2)/day). Immersion test showed that the nano-Si/TiO2 coating presented a greater nucleation site of hydroxyapatite (HA) than the uncoated sample. Thus nano-Si/TiO2 composite coating prepared by PVD on the Mg-Ca alloy is more appropriate for biomedical applications. Elsevier 2014 Article PeerReviewed Bakhsheshi Rad, Hamid Reza and Hamzah, Esah and Daroonparvar, Mohammadreza and Kasiri-Asgarani, Masoud and Medraj, Mamoun (2014) Synthesis and biodegradation evaluation of nano-Si and nano-Si/TiO2 coatings on biodegradable Mg-Ca alloy in simulated body fluid. Ceramics International, 40 (9PartA). pp. 14009-14018. ISSN 0272-8842 http://dx.doi.org/10.1016/j.ceramint.2014.05.126 DOI:10.1016/j.ceramint.2014.05.126
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
Bakhsheshi Rad, Hamid Reza
Hamzah, Esah
Daroonparvar, Mohammadreza
Kasiri-Asgarani, Masoud
Medraj, Mamoun
Synthesis and biodegradation evaluation of nano-Si and nano-Si/TiO2 coatings on biodegradable Mg-Ca alloy in simulated body fluid
description In the present study, nano-Si and nano-Si/TiO2 composite coatings have been successfully synthesized on the surface of Mg-1 wt%Ca alloy by the physical vapor deposition (PVD) method. The surface morphology and compositions of the coated specimens were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), transmission election microscopy (TEM), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The results show the formation of thin and compact coating layers which homogeneously cover the surface of Mg alloy. Some micro-pores and micro-cracks were observed in the Si and Si/TiO2 films. It was also found that the Si and TiO2 nanoparticle had a spherical morphology with an average particle size of 30-40 nm and 70-80 nm, respectively. Electrochemical studies revealed that nano-Si/TiO2 coating offers a significant reduction in the corrosion rate (0.57 mm/year) compared to the Si coated (0.91 mm/year) and the uncoated alloys (6.21 nun/year) in simulated body fluid (SBF). Hydrogen evolution studies showed a lower degradation rate of nano-Si/TiO2 (1.57 mIkm(2)/day) than that of nano-Si coated alloy (2.22 ml/cm(2)/day). Immersion test showed that the nano-Si/TiO2 coating presented a greater nucleation site of hydroxyapatite (HA) than the uncoated sample. Thus nano-Si/TiO2 composite coating prepared by PVD on the Mg-Ca alloy is more appropriate for biomedical applications.
format Article
author Bakhsheshi Rad, Hamid Reza
Hamzah, Esah
Daroonparvar, Mohammadreza
Kasiri-Asgarani, Masoud
Medraj, Mamoun
author_facet Bakhsheshi Rad, Hamid Reza
Hamzah, Esah
Daroonparvar, Mohammadreza
Kasiri-Asgarani, Masoud
Medraj, Mamoun
author_sort Bakhsheshi Rad, Hamid Reza
title Synthesis and biodegradation evaluation of nano-Si and nano-Si/TiO2 coatings on biodegradable Mg-Ca alloy in simulated body fluid
title_short Synthesis and biodegradation evaluation of nano-Si and nano-Si/TiO2 coatings on biodegradable Mg-Ca alloy in simulated body fluid
title_full Synthesis and biodegradation evaluation of nano-Si and nano-Si/TiO2 coatings on biodegradable Mg-Ca alloy in simulated body fluid
title_fullStr Synthesis and biodegradation evaluation of nano-Si and nano-Si/TiO2 coatings on biodegradable Mg-Ca alloy in simulated body fluid
title_full_unstemmed Synthesis and biodegradation evaluation of nano-Si and nano-Si/TiO2 coatings on biodegradable Mg-Ca alloy in simulated body fluid
title_sort synthesis and biodegradation evaluation of nano-si and nano-si/tio2 coatings on biodegradable mg-ca alloy in simulated body fluid
publisher Elsevier
publishDate 2014
url http://eprints.utm.my/id/eprint/62764/
http://dx.doi.org/10.1016/j.ceramint.2014.05.126
_version_ 1643655515910176768
score 13.251813

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