GROWTH OF FOURTH GENERATION ELONGATED TIO2 NANOTUBES IN MIXED ELECTROLYTES
The effects of oxalic acid and phosphoric acid mixture in the formation of enlarged titanium oxide nanotubes was investigated in the current study.
The anodizaion was carried out in an aqueous electrolyte containing oxalic acid, phosphoric acid, hydrogen peroxide in ethylene glycol in a simple two electrode system at room temperature by using potentiostat set up.
The coexistence of anatase and rutile phases were noticed to be from higher ratio of anatase peaks to rutile peaks. Diameter of the TNTs increased with elevated applied voltage. At low voltage, random cracks with no noticeable structure was seen on the Ti substrate. But on increasing value of the applied potential, determinable tubular structure of TNTs emerges in the crack. Maximum number of E.Coli bacteria were noticed on the agar medium without TiO2 nanoparticles than observed on the agar medium with TiO2 nanoparticles.
The presence of H3PO4 in the electrolyte, enhanced the growth of nanotube diameter and length. The ionic current increased with increase in H3PO4 concentration that lead to formation of oxide layer and increase in oxide forming efficiency. Having better mechanical properties, adhesion strength, surface roughness, hydrophilic properties, the anodized titania nanotube surfaces are envisaged to have better cell activity, biocompatibility with antimicrobial property and also longevity. It can be applicable as the better implant surface in human body environment.
Keywords: TiO2 nanotubes; anodization; oxalic acid; fluorine free; antibacterial.
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