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Surface modification of zirconium implants via electrochemical anodization and wet chemical techniques Open Access

Descriptions

Other title
Subject/Keyword
Zirconium
Surface modification
wet chemistry
anodization
nanotube
implant
coating
biocompatibility
hydroxyapatite
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Wang, Luning
Supervisor and department
Jingli Luo (Chemical and Materials Engineering)
Examining committee member and department
Weixing Chen (Chemical and Materials Engineering)
Lawrence H. Le (Department of Radiology and Diagnostic Imaging)
Hongbo Zeng (Chemical and Materials Engineering)
Changjian Lin (External reader, Department of Chemistry, Xiamen University)
Thomas H. Etsell (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization

Date accepted
2011-07-15T15:22:07Z
Graduation date
2011-11
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
Metals such as titanium (Ti) and zirconium (Zr) have been widely applied in the orthopaedic and orthodontic field for construction of joint replacement prostheses and teeth implants due to their lower cytotoxicity, excellent mechanical properties, and corrosion resistance. However, the current 15-20 year life span has been a challenging problem for metal-based orthopedic materials. Limited cytocompatibility properties and osseointegration of implants with surrounding bone has been proposed as one of the leading causes of such limited lifetimes. To improve the cytocompatibility properties of metal orthopedic implants, nanotechnology has been used to create nano-featured thin oxide films (through electrochemical anodization) on metal surfaces, such as nanotubular arrays. This thesis describes the fabrication of zirconium dioxide (ZrO2) nanotubular arrays on Zr surfaces and several efficient techniques to enhance the biocompatibility of as-formed ZrO2 nanotubular arrays via simple wet chemistry treatments. A series of highly ordered ZrO2 nanotubular array films with different thickness was synthesized in fluoride containing electrolyte by changing the anodic voltage or anodization period. Geometrical factors such as thickness and diameter of nanotubular openings depend on anodization voltage and anodization period. Mechanical properties such as apparent Young’s modulus, ratio of elastic energy to the total deformation energy, and hardness are highly dependent on thickness but not on diameter of nanotubular openings. Resistance of nanotubular arrays to sliding wear and wear loss of nanotubular arrays vary with the culture used. Several wet chemical techniques including the evaporation-based immersion technique and accelerated immersion method have been explored and found to enhance considerably the bioactivity of ZrO2 nanotubular arrays by enhancing the capability of formation thereon of the hydroxyapatite (HA) layer in simulated biological culture. In this work, I found that a combination of anodic ZrO2 nanotubular arrays and wet chemical treatment achieves the required significant improvement of bioactivity of Zr implant.
Language
English
DOI
doi:10.7939/R3ZM0R
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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File title: Microsoft Word - Thesis draft-v.6.doc
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