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In this work, the surface functionalization by anodizing of different new Ti-alloys for biomedical applications are studied. The anodizing of new superelastic Ti-17Nb-6Ta alloy in aqueous electrolyte containing 0.11 M NH4F + 1 M (NH4)2SO4 to form homogenous and heterogeneous oxide nanotubes with various inner diameters (80-190 nm) and wall thicknesses (6-28 nm) were conducted. The formed nanoarchitectured system is proposed as surface modification for drug eluting stents since the substrate, Ti-17Nb-6Ta alloy, has high potential for self-expandable stents manufacturing [1]. For this, two oxide nanotubes morphologies were prepared to investigate the effect of structure homogeneity on the intended application [2], as shown in Figure 1 Another Ti-Mo-Fe alloy system for bio-implant applications were anodized in the same way. The surface oxide nanotubes with different inner diameters and wall thicknesses were prepared. It showed different cytotoxicity response depending on the alloy composition and oxide nanotube size. The formed oxide nanotubes were characterized by field-emission scanning electron microscope (FESEM), X-ray diffraction (XRD), Raman spectroscopy, energy dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS). Nanoindentation technique was used to study the mechanical properties of the fabricated oxide nanotubes. Cytotoxicity and proliferation studies were done and compared for the different fabricated nanoarchitectures versus smooth untreated samples using in-vitro cultured cells.

International Symposium on Light Alloys and Composite Materials
UHAKS

Mohamed A. Gepreel Yasser Abdelrhman Yomna E. Saleh Nageh K. Allam