Journal of Materials Research


Apatite-inducing ability of titanium oxide layer on titanium surface: The effect of surface energy

X.J. Wanga1, Y.C. Lia1, J.G. Lina1, P.D. Hodgsona1 and C.E. Wena1 c1

a1 Centre for Material and Fibre Innovation, Deakin University, Geelong, VIC 3217, Australia


In the present study, pure titanium (Ti) plates were firstly treated to form various types of oxide layers on the surface and then were immersed into simulated body fluid (SBF) to evaluate the apatite-forming ability. The surface morphology and roughness of the different oxide layers were measured by atomic force microscopy (AFM), and the surface energies were determined based on the Owens–Wendt (OW) methods. It was found that Ti samples after alkali heat (AH) treatment achieved the best apatite formation after soaking in SBF for three weeks, compared with those without treatment, thermal or H2O2 oxidation. Furthermore, contact angle measurement revealed that the oxide layer on the alkali heat treated Ti samples possessed the highest surface energy. The results indicate that the apatite-inducing ability of a titanium oxide layer links to its surface energy. Apatite nucleation is easier on a surface with a higher surface energy.

(Received December 11 2007)

(Accepted February 28 2008)

Key Words:

  • Ti;
  • Biomimetic (chemical reaction);
  • Nanostructure


c1 Address all correspondence to this author. e-mail: