Abstract
Commercially dense pure titanium sheets and porous titanium samples processed by powder metallurgy were treated with a mixture consisting of equal volumes of H2SO4 and H2O2 for 2 or 4 hours. Characterization was performed by scanning electron microscopy, energy dispersive X-ray spectroscopy, confocal scanning optical microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The analyses showed that the chemical patterning approach using a combination of concentrated acid and oxidant was able to generate a nanotexture on dense and porous titanium surfaces. In addition, the treated samples presented an oxide layer consisting predominantly of titanium dioxide with negative charge conferred by the presence of hydroxyl groups, which is an important factor that favors apatite nucleation and protein adsorption. It was also observed that oxide formation was more effective on porous samples than on dense samples, which can be explained by the higher surface area intrinsic to porous media. Finally, the findings indicated that both treatment times promoted similar modifications in surface properties, such as nanotexture and chemical composition, suggesting that the time of 2 hours were enough to induce the surface alterations at the nanoscale.
Highlights
Surface properties can affect the tissue/implant interaction, including composition, surface energy, roughness and topography
It is important to highlight that studies on surface modification of porous titanium parts by controlled chemical oxidation with H2SO4 and H2O2 have not been substantially reported yet [15]
A chemical patterning approach using a combination of concentrated acid and oxidant was able to generate a nanotexture on dense and porous titanium surfaces
Summary
Surface properties can affect the tissue/implant interaction, including composition, surface energy, roughness and topography. Powder metallurgy (PM) has been successfully used to produce titanium implants with controlled porosity without undesirable reactions or contaminations, proving to be an advantageous technique to process Ti parts [9]. These implants may have their bioactivity improved by various surface modification techniques, such as mechanical, physical and chemical methods. These methods can modify the metal surface properties on a range of scales [10]. It is recognized that material-host tissue interactions are principally governed by nanometric surface cues [7]
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