Sol-gel derived Ag-containing TiO2 films on surface roughened biomedical NiTi alloy

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

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Author(s)

  • Tao Fu
  • Zafer Alajmi
  • Yuning Wang
  • Shuiyun Yang
  • Gang Li

Detail(s)

Original languageEnglish
Pages (from-to)12423-12429
Journal / PublicationCeramics International
Volume40
Issue number8 PART A
Online published26 Apr 2014
Publication statusPublished - Sep 2014

Abstract

Ag-containing TiO2 films (Ag/Ti=3.3, 9.1 at%) were sol-gel coated on NiTi alloy that had been surface roughened by the NaOH-HCl treatment for antibacterial application. Thermal analyses of the dried gels reveal that the addition of 9.1 at% Ag lowers the anatase-rutile transformation temperature from 618 to 586 °C. Morphological observation shows that surface roughening and silver addition improve structural integrity of the TiO2 films. X-ray diffraction reveals that the addition of Ag does not obviously change crystallinity of the anatase films. X-ray photoelectron spectroscopy results indicate metallic nature of Ag in the film and complete coverage of the films on the roughened alloy substrate. Microindentation test exhibits that the Ag-TiO2 film on the roughened substrate has higher cohesive strength than that on the polished substrate. The potentiodynamic polarization test in a Ca-free Hank's balanced salt solution demonstrates good protection of the TiO2 and Ag-TiO2 films for the alloy substrate. Ultraviolet light illumination for 3 h can increase surface hydrophilicity of the coated NiTi samples by reducing contact angles from >65° to

Research Area(s)

  • Ag, C. Corrosion, NiTi alloy, Sol-gel

Citation Format(s)

Sol-gel derived Ag-containing TiO2 films on surface roughened biomedical NiTi alloy. / Fu, Tao; Shen, Yaogen; Alajmi, Zafer; Wang, Yuning; Yang, Shuiyun; Li, Gang.

In: Ceramics International, Vol. 40, No. 8 PART A, 09.2014, p. 12423-12429.

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