Acid‐induced bioactive titania surface

Abstract

Nano- and conventional-TiO(2) powders were deposited onto titanium alloy using atmospheric plasma spraying technology. As-sprayed titania coatings were treated by H(2)SO(4) and HCl solutions at room temperature for 24 h, and the bioactivity was evaluated by simulated body fluid tests. Measured X-ray diffraction patterns indicated that as-sprayed titania coatings obtained from both nano and conventional powders were composed of primary rutile as well as a small quantity of anatase and Ti(3)O(5). The surface of as-sprayed coatings prepared from the conventional powder was rougher than that from nanopowder. After immersion in simulated body fluid for 2 weeks, both acid-treated nano- and titania coatings have induced carbonate-containing hydroxyapatite to form on the surfaces. However, this phenomenon did not appear on the surface of as-sprayed nano- and conventional-titania coatings. The results obtained indicated that the bioactivity of plasma sprayed titania coatings was improved by the acid treatment and had nothing to do with phase composition and particle size of the original TiO(2) powders.

Positively charged bioactive Ti metal prepared by simple chemical and heat treatments

“…Zhao et al (2005Zhao et al ( , 2008 reported that a plasmasprayed TiO 2 coated layer with a rutile phase showed a high apatite-forming ability in an SBF when treated with an acid solution, such as H 2 SO 4 and HNO 3 . Kokubo et al (2008) reported that a titania gel layer coated on polyethylene terephthalate using a sol -gel method formed apatite on its surface in an SBF when it was treated with an HCl solution at 808C for a period of 8 days.…”

The effect of chemical treatment on apatite-forming ability of the macroporous zirconia films formed by micro-arc oxidation

“…It has been reported that alkali-treated titanium [22][23][24], tantalum [25,26] and zirconium [4] metals and acid-treated titania [27] could form a bonelike apatite layer on their surfaces in a SBF solution. These results suggested that alkali or acid treatment may be an effective routine to activate metals and ceramics.…”

Formation of Hydroxyapatite Coating on Anodic Titanium Dioxide Nanotubes via an Efficient Dipping Treatment

“…[7][8][9] For example, chemical etching in either acidic or alkaline solutions or anodization above the breakdown potential to obtain a porous structure was reported by numerous groups. [10][11][12][13][14][15] Besides the etching and oxidation modification methods, different calcium phosphates (CaP), such as hydroxyapatite (HA, Ca 10 (PO 4 ) 6 (OH) 2 ), have been used often as a coating on titanium to improve its biocompatibility. [7,[16][17][18] The plasma-sprayed HA-coated titanium alloys have been clinically applied.…”