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Preparation of Hydroxyapatite/Tannic Acid Coating to Enhance the Corrosion Resistance and Cytocompatibility of AZ31 Magnesium Alloys

Biodegradable Ceramics Consisting of Hydroxyapatite for Orthopaedic Implants

Department of Medical Biosciences, University of the Western Cape, Bellville 7535, South Africa
Metallurgical and Materials Engineering Department, Engineering Faculty, Dokuz Eylul University, Tinaztepe Campus, Izmir 35397, Turkey
Faculty of Material Science and Engineering, University Politehnica of Bucharest, 313 Spl. Independentei, Bucharest 060042, Romania
Department of Experimental Physics, National Research Tomsk Polytechnic University, Lenin Avenue 43, Tomsk 634050, Russia
National Institute for Optoelectronics, 409 Atomistilor St., Magurele 77125, Romania
Author to whom correspondence should be addressed.
Academic Editor: Yuelian Liu
Coatings 2017, 7(11), 184;
Received: 11 September 2017 / Revised: 20 October 2017 / Accepted: 27 October 2017 / Published: 3 November 2017
(This article belongs to the Special Issue Advanced Biomimetic Calcium Phosphate Coatings)
This study aims to analyze hydroxyapatite (HAP) coatings enriched with Mg and Ti prepared by a magnetron sputtering technique on Ti6Al4V substrate. For preparation of the coatings, three magnetron targets (HAP, MgO and TiO2) were simultaneously co-worked. The concentration of Mg added was varied by modifying the power applied to the MgO target. In all coatings, the Ti concentration was maintained constant by keeping the same cathode power fed during the whole deposition. The influence of different Mg dopant contents on the formation of phase, microstructure and morphology of the obtained Ti-doped HAP coatings were characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Moreover, the effects of Mg addition upon corrosion, mechanical and biological properties were also investigated. Mg- and Ti-doped HAP coating obtained at low radio-frequency (RF) power fed to the MgO target provided material with high corrosion resistance compared to other coatings and bare alloy. A slight decrease in hardness of the coatings was found after the Mg addition, from 8.8 to 5.7 GPa. Also, the values of elastic modulus were decreased from 87 to 53 GPa, this being an advantage for biomedical applications. The coatings with low Mg concentration proved to have good deformation to yielding and higher plastic properties. Biological test results showed that the novel surfaces exhibited excellent properties for the adhesion and growth of bone cells. Moreover, early adherent vital cell numbers were significantly higher on both coatings compared to Ti6Al4V, suggesting that Mg ions may accelerate initial osteoblast adhesion and proliferation. View Full-Text
Keywords: hydroxyapatite; corrosion; roughness; nanoindentation; osteoblasts; magnetron sputtering hydroxyapatite; corrosion; roughness; nanoindentation; osteoblasts; magnetron sputtering
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MDPI and ACS Style

Monsees, T.K.; Ak Azem, F.; Cotrut, C.M.; Braic, M.; Abdulgader, R.; Pana, I.; Birlik, I.; Kiss, A.; Booysen, R.; Vladescu, A. Biodegradable Ceramics Consisting of Hydroxyapatite for Orthopaedic Implants. Coatings 2017, 7, 184.

AMA Style

Monsees TK, Ak Azem F, Cotrut CM, Braic M, Abdulgader R, Pana I, Birlik I, Kiss A, Booysen R, Vladescu A. Biodegradable Ceramics Consisting of Hydroxyapatite for Orthopaedic Implants. Coatings. 2017; 7(11):184.

Chicago/Turabian Style

Monsees, Thomas K., Funda Ak Azem, Cosmin M. Cotrut, Mariana Braic, Radwan Abdulgader, Iulian Pana, Isil Birlik, Adrian Kiss, Robin Booysen, and Alina Vladescu. 2017. "Biodegradable Ceramics Consisting of Hydroxyapatite for Orthopaedic Implants" Coatings 7, no. 11: 184.

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