Enhanced interfacial adhesion and osseointegration of anodic TiO2 nanotube arrays on ultra-fine-grained titanium and underlying mechanisms

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Nan Hu
  • Yuzheng Wu
  • Lingxia Xie
  • Shahir Mohd Yusuf
  • Nong Gao
  • Marco J. Starink
  • Liping Tong
  • Huaiyu Wang

Detail(s)

Original languageEnglish
Pages (from-to)360-375
Journal / PublicationActa Biomaterialia
Volume106
Online published11 Feb 2020
Publication statusPublished - 1 Apr 2020

Abstract

The poor adhesion of anodic TiO2 nanotubes (TNTs) arrays on titanium (Ti) substrates adversely affects applications in many fields especially biomedical engineering. Herein, an efficient strategy is described to improve the adhesion strength of TNTs by performing grain refinement in the underlying Ti substrate via high-pressure torsion processing, as a larger number of grain boundaries can provide more interfacial mechanical anchorage. This process also improves the biocompatibility and osseointegration of TNTs by increasing the surface elastic modulus. The TNTs in length of 0.4 µm have significantly larger adhesion strength than the 2.0 µm long ones because the shorter TNTs experience less interfacial internal stress. However, post-anodization annealing reduces the fluorine concentration in TNTs and adhesion strength due to the formation of interfacial cavities during crystallization. The interfacial structure of TNTs/Ti system and the mechanism of adhesion failures are further investigated and discussed. Statement of Significance: Self-assembled TiO2 nanotubes (TNTs) prepared by electrochemical anodization have a distinct morphology and superior properties, which are commonly used in photocatalytic systems, electronic devices, solar cells, sensors, as well as biomedical implants. However, the poor adhesion between the TNTs and Ti substrate has hampered wider applications. Here in this study, we describe an efficient strategy to improve the adhesion strength of TNTs by performing grain refinement in the underlying Ti substrate via high-pressure torsion (HPT) processing. The interfacial structure of TNTs/Ti system and the mechanism of adhesion failure are systematically studied and discussed. Our findings not only develop the knowledge of TNTs/Ti system, but also provide new insights into the design of Ti-based implants for orthopedic applications.

Research Area(s)

  • Adhesion strength, High-pressure torsion, Ti-based implants, TiO2 nanotubes, Ultra-fine-grained materials

Citation Format(s)

Enhanced interfacial adhesion and osseointegration of anodic TiO2 nanotube arrays on ultra-fine-grained titanium and underlying mechanisms. / Hu, Nan; Wu, Yuzheng; Xie, Lingxia; Yusuf, Shahir Mohd; Gao, Nong; Starink, Marco J.; Tong, Liping; Chu, Paul K.; Wang, Huaiyu.

In: Acta Biomaterialia, Vol. 106, 01.04.2020, p. 360-375.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review