TiO2 nanotubes from stirred glycerol/NH4F electrolyte: Roughness, wetting behavior and adhesion for implant applications

R. Narayanan, Tae Yub Kwon, Kyo Han Kim

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

Abstract

Titanium oxide (TiO2) was anodically formed on titanium from non-aqueous electrolyte containing glycerol and 0.5 wt.% ammonium fluoride (NH4F). Oxidation was carried out for 30, 60, 120 and 240 min at potentiostatic 30 V with the bath being stirred using magnetic pellet. All the conditions produced amorphous nanotubes. They had an average diameter of 50-130 nm and length in the range of 1.2-1.9 μm. The porosity was in the range of 70-80%. Stirring of the glycerol-based electrolyte has proved to be advantageous in retaining the tubular structure and providing smooth tubes even at 30 V condition. The coatings had surface roughness Ra lower than 0.5 μm, water wetting angles in the range of 58-84°. Increasing pore diameters increased the water wetting angles. All the coatings invariably showed poor tensile pull-off adhesion strengths. This poor adhesion is attributed to the stirring of the electrolyte.

Original languageEnglish
Pages (from-to)460-464
Number of pages5
JournalMaterials Chemistry and Physics
Volume117
Issue number2-3
DOIs
StatePublished - 15 Oct 2009

Keywords

  • Biomaterial
  • Coating
  • Nanostructure
  • Oxide

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