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Development of zinc-halloysite nanotube/minerals substituted hydroxyapatite bilayer coatings on titanium alloy for orthopedic applications A Physicochemical and engineering aspects

Chozhanathmisra, M., Ramya, S., Kavitha, L., Gopi, D.
Colloids and surfaces 2016 v.511 pp. 357-365
Fourier transform infrared spectroscopy, X-ray diffraction, alloys, antibacterial properties, cell viability, coatings, corrosion, electrochemistry, energy-dispersive X-ray analysis, hydroxyapatite, nanotubes, orthopedics, samarium, scanning electron microscopy, strontium, titanium, transmission electron microscopy
In the present investigation, the zinc-halloysite nanotubes (Zn-HNT)/strontium (Sr²⁺), samarium (Sm²⁺) substituted hydroxyapatite (M-HA) bilayer coating is obtained on titanium alloy (Ti6Al4V) by electrodeposition and the Zn-HNT/M-HA bilayer coating can be successfully combined to produce the bioactive and corrosion resistance for orthopaedic applications.The existence the of the as-developed Zn-HNT/M-HA bilayer coating on Ti6Al4V was confirmed by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), high resolution scanning electron microscopy (HRSEM), energy dispersive X-ray analysis (EDAX) and high resolution transmission electron microscopy (HRTEM). The effects of Zn-HNT/M-HA bilayer coating on anticorrosion property of Ti6Al4V were also investigated using electrochemical studies in the simulated body fluid (SBF) solution.The antibacterial activity and in-vitro cell viability of the Zn-HNT/M-HA bilayer coating were investigated. As a result of these investigations, it is revealed that the Zn-HNT/M-HA bilayer coating on Ti6Al4V improved the anticorrosion performance and the combination of Zn-HNT and M-HA in the bilayer coating significantly enhanced the bioactivity of the as coated Ti6Al4V which is potential for orthopedic applications.