Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/36008
Title: Bioactive hydroxyapatite/graphene composite coating and its corrosion stability in simulated body fluid
Authors: Jankovic, A
Erakovic, S
Mitric, M
Matic, IZ
Juranic, ZD
Tsui, GCP 
Tang, CY 
Miskovic-Stankovic, V
Rhee, KY
Park, SJ
Keywords: Nano-structures
Mechanical properties
Corrosion
Surface analysis
Issue Date: 2015
Publisher: Elsevier
Source: Journal of alloys and compounds, 2015, v. 624, p. 148-157 How to cite?
Journal: Journal of alloys and compounds 
Abstract: The hydroxyapatite/graphene (HAP/Gr) composite was electrodeposited on Ti using the electrophoretic deposition process to obtain uniform bioactive coating with improved mechanical strength and favorable corrosion stability in simulated body fluid (SBF). Incorporation of Gr was verified by Raman spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, and X-ray photoelectron analysis. The HAP/Gr composite coating exhibited reduced surface cracks, nearly double the hardness, and elastic modulus increased by almost 50% compared to pure HAP coating, as estimated by a nanoindentation test. The bioactive HAP/Gr composite coating provided a newly formed apatite layer in SBF with enhanced corrosion stability, as evidenced by electrochemical impedance spectroscopy. The thermal stability of the HAP/Gr coating was improved in comparison to the pure HAP coating, and the Ca/P ratio was closer to the stoichiometric value. No antibacterial activity against Staphylococcus aureus or Escherichia coli could be verified. The HAP/Gr composite coating was classified as non-cytotoxic when tested against healthy peripheral blood mononuclear cells (PBMC).
URI: http://hdl.handle.net/10397/36008
ISSN: 0925-8388
DOI: 10.1016/j.jallcom.2014.11.078
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