Zal Nezhad, Erfan
2017-11-21T06:33:52Z
2017-11-21T06:33:52Z
2016-01
RSC ADVANCES, v. 6, NO 13, Page. 10527-10540
2046-2069
http://pubs.rsc.org/en/Content/ArticleLanding/2016/RA/C5RA20493C#!divAbstract
http://hdl.handle.net/20.500.11754/31735
Highly oriented arrays of TiO2-Nb2O5-Al2O3 mixed oxide nanotubes were fabricated via physical vapor deposition (PVD) to sputter a niobium film on Ti-6Al-7Nb (Ti67) and subsequent electrochemical anodization in ethylene glycol/ammonium fluoride/ionized water (5 wt%) electrolyte. Parametric optimization for higher adhesion strength and microhardness was conducted using Taguchi experimental design methodology. The highest adhesion strength and microhardness of the as-deposited Nb film was achieved at 350 W DC power, 20 sccm argon flow rate and a 90 V bias voltage. The microstructural features were found to depend on the anodization time and subsequent thermal treatment. The anodization of Nb/Ti67 for 4 h resulted in a homogeneous ordering of the mixed oxide nanotubes. Upon annealing at a low heating and cooling rate of 1 degrees C at 440 degrees C for 30 min in an atmospheric furnace, a highly ordered nanotube array contained a mixture of TiO2, Al2O3 and Nb2O5 phases, wherein the composition of the oxide nanotubes was strongly influenced by the chemistry of the phases present in Ti67. The results of in vitro bioactivity indicated that the crystallized mixed oxide nanotubes could induce a quick apatite formation after immersion in simulated body fluid (SBF). The above findings may contribute to the development of novel nanostructured materials for metallic orthopedic implants.
The authors want to acknowledge the University of Malaya regarding to provide the necessary resources and facilities for this study. This project was completely funded by the Ministry of Higher Education, Malaysia with the high impact research grant numbers of UM.C/625/1/HIR/MOHE/ENG/27. This research is also partly funded under the University of Malaya under an UMRG program grant number of UM.TNC2/RC/AET/261/1/1/RP017-2012C. The authors are also grateful to Research Affairs of Islamic Azad University, Najafabad Branch for supporting of this research.
en
ROYAL SOC CHEMISTRY
HIGH-ASPECT-RATIO
SIMULATED BODY-FLUID
BIOACTIVE TITANIUM METAL
IN-VITRO EVALUATION
TIO2 NANOTUBES
NB2O5 NANOTUBES
ELECTROCHEMICAL ANODIZATION
BIOMEDICAL APPLICATIONS
BIOMIMETIC APATITE
ANODIC-OXIDATION
Optimized fabrication and characterization of TiO2-Nb2O5-Al2O3 mixed oxide nanotube arrays on Ti-6Al-7Nb
Article
13
6
10.1039/c5ra20493c
10527-10540
RSC ADVANCES
Rafieerad, A. R.
Bushroa, A. R.
Nasiri-Tabrizi, B.
Vadivelu, J.
Baradaran, S.
Zalnezhad, E.
Amiri, A.
2016010115
S
COLLEGE OF ENGINEERING[S]
DIVISION OF MECHANICAL ENGINEERING
erfan