A chemical patterning approach of dense and porous titanium surfaces by using a combination of concentrated acid and oxidant
| Autor: | Alexandre Antunes Ribeiro, Débora Vieira Way, E.B. Silveira, Fabiana M.T. Mendes, Marize Varella de Oliveira, Rodrigo Sacramento da Silva, Lais de Souza Alves |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Scanning electron microscope Oxide General Physics and Astronomy chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences chemistry.chemical_compound X-ray photoelectron spectroscopy Powder metallurgy General Materials Science titanium technology industry and agriculture General Chemistry equipment and supplies 021001 nanoscience & nanotechnology 0104 chemical sciences powder metallurgy chemistry Chemical engineering Titanium dioxide Surface modification chemical oxidation 0210 nano-technology Porous medium surface modification Titanium |
| Zdroj: | Matéria (Rio de Janeiro) v.26 n.2 2021 Matéria (Rio de Janeiro. Online) instacron:RLAM Matéria (Rio de Janeiro), Volume: 26, Issue: 2, Article number: e12984, Published: 24 MAY 2021 |
| ISSN: | 1517-7076 |
| DOI: | 10.1590/s1517-707620210002.1284 |
| Popis: | 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. Keywords: titanium; surface modification; chemical oxidation, powder metallurgy. |
| Databáze: | OpenAIRE |
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