Scopus İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.14901/696

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Citation - WoS: 10
Citation - Scopus: 9
The Effect of Doping Different Amounts of Boron on the Corrosion Resistance and Biocompatibility of TiO2 Nanotubes Synthesized on SLM Ti6Al4V Samples
(Elsevier, 2024) Acar, M. T.; Comakli, O.; Yazici, M.; Arslan, M. E.; Yetim, A. F.; Celik, A.
This comprehensive study investigates the corrosion and biocompatibility performances of boron-doped TiO2 nanotubes (TNT) synthesized on Ti6Al4V alloy produced by the selective laser melting (SLM) process. Structural analysis reveals a consistent reduction in nanotube diameter across varying boron doping levels (0.05 - 2 M boric acid doping), with B4-TNT exhibiting the smallest diameter at 190 nm. Boron incorporation induces phase transformation and decreases in diameter of nanotubes, influencing the material's structural properties. Corrosion resistance assessments indicate a significant enhancement, with B4-TNT demonstrating the highest polarization resistance (Rt = 2849.03 k Omega.cm2). The observed improvements are attributed to the combination of reduced nanotube diameter, altered phase structure, and increased polarization resistance, collectively contributing to enhanced corrosion resistance. Biocompatibility experiments conducted with human fibroblast cells (HDFa) reveal that B-doped TNTs foster increased cell viability compared to undoped TNT and uncoated alloy surfaces. These findings underscore the potential of boron doping as a strategic approach to improve corrosion resistance and enhance the biocompatibility of Ti6Al4V implants. This study provides valuable insights for advancing materials in biomedical applications with improved structural, corrosion-resistant, and biocompatible properties.
Citation - WoS: 45
Citation - Scopus: 48
Improving Structural, Tribological and Electrochemical Properties of Ti6al4v Alloy with B-Doped TiO2 Thin Films
(Elsevier Sci Ltd, 2020) Celik, A.; Acar, M. T.; Yetim, T.; Kovaci, H.; Yetim, A. F.
B-doped TiO2 coatings with different B:Ti molar ratios were produced on Ti6Al4V alloy by a sol-gel dip-coating in order to improve tribological and electrochemical properties of Ti6Al4V. The properties of films were evaluated by XRD, XPS, SEM, surface tension-meter, tribotester and EIS. The highest roughness and hardness were obtained from B:Ti molar ratio of 2:1 TiO2 thin-film. TiO2 and B-doped TiO2 improved the wear resistance. While the mean CoF of Ti6Al4V was 0.39, TiO2 films reduced CoF significantly. B-doped TiO2 showed higher wear resistance than substrate and TiO2 film. Corrosion resistance was enhanced by TiO2 and the increasing B molar ratio provided improvement. The surface state changed after coatings. While TiO2 film showed hydrophobic behavior, B-doped all films exhibited hydrophilic characteristics.
The Influence of Energy Density in Selective Laser Melting on TNT-Coated Ti6al4v: Corrosion Resistance and Biocompatibility Insights
(Springer, 2026) Comakli, O.; Acar, M. T.; Yazici, M.; Arslan, E.; Turkez, H.
Ti6Al4V alloys were fabricated using a selective laser melting (SLM) method at different energy densities. Afterward, TiO2 nanotube (TNT) films were deposited on the surfaces of these substrates via anodization to investigate the effect of energy density on the resulting TNT structures. According to results, the high-energy-density SLM sample exhibited a relative density (RD) exceeding 98.8%, representing the highest RD among all the fabricated samples. Moreover, the smallest nanotube diameter and the greatest film thickness were obtained from the anodization of the substrate with the highest relative density, which was a result of being fabricated at the highest energy density. Electrochemical tests revealed significant improvements in corrosion resistance for TNT-coated samples compared to untreated Ti6Al4V. The TNT-coated Ti6Al4V sample fabricated at the highest SLM energy density (A2) exhibited the highest corrosion potential (Ecorr = -1.24 V) and the lowest corrosion current density (Icorr = 56 x 10(-)(8) A/cm2), while untreated Ti6Al4V (A1) showed Ecorr = -1.74 V and Icorr = 303 x 10(-)(7) A/cm2. Biological evaluations demonstrated that TiO2 nanotube (TNT) coatings significantly enhanced the biocompatibility and antibacterial properties of Ti6Al4V surfaces, particularly for the A2 sample. Fluorescence staining, MTT assays, and nuclear staining confirmed that A2, which featured reduced nanotube diameter and increased length, supported superior osteoblast adhesion, proliferation, and viability, while also exhibiting the strongest antibacterial activity against E. coli. These improvements were attributed to the optimized nanotopography, which promoted cell interaction and inhibited bacterial adhesion.
Citation - WoS: 3
Citation - Scopus: 5
Selective Laser Melting of Ti6Al4V Alloy: Effects of Graphene-TiO2 Nanotubes Composites Corrosion and Biocompatibility
(Elsevier Science SA, 2024) Acar, M. T.; Comakli, O.; Arslan, M. E.
This study investigates the effects of graphene amount on TiO2 nanotubes (TNT) synthesized on Ti6Al4V alloy via selective laser melting (SLM) to optimize corrosion resistance and biocompatibility. XRD analysis indicated the presence of anatase and rutile phases in TNTs, and the peak shifts indicated that graphene was successfully incorporated into the TNT structure. SEM images revealed that increasing the amount of graphene resulted in smaller nanotube diameters, increased contact angles, and imparted hydrophobic properties. Corrosion tests including Tafel polarization and electrochemical impedance spectroscopy (EIS) showed that graphene, especially C4-TNTs, exhibited superior corrosion resistance with high Ecorr and Rt values. Biocompatibility tests with human dermal fibroblast cells (HDFa) demonstrated cell viability with the incorporation of graphene into TNTs. The findings suggest that the optimum amount of graphene can significantly improve the corrosion resistance and biocompatibility of TiO2 nanotubes on Ti6Al4V alloy, making them more suitable for biomedical implants.

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Browsing Scopus İndeksli Yayınlar Koleksiyonu by Author "Acar, M. T."