Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7148
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Article Citation - WoS: 1Citation - Scopus: 1Electrochemical Evaluation of Strontium-Doped Micro-Arc Oxidation Surfaces on Titanium(Mdpi, 2025) Alves, Alexandra C.; Duraes, Carolina; Toptan, FatihTitanium (Ti) alloys are widely used in biomedical applications but face challenges like poor biological activity and corrosion at modular interfaces. Strontium (Sr)-doped micro-arc oxidation (MAO) surfaces are proposed to improve biocompatibility and tribocorrosion resistance. This study examines the electrochemical behaviour of Ti surfaces treated with 0.0013 M and 0.13 M Sr-doped MAO via open circuit potential, potentiodynamic polarisation, and electrochemical impedance spectroscopy in a basic physiological solution at 37 degrees C. The results indicate that higher Sr concentrations led to lower passivation current densities (more than two times lower than at the lowest Sr concentration) and reduced barrier layer capacitance (more than one and a half times lower than at the lowest Sr concentration), suggesting improved corrosion resistance for Sr-enriched MAO treatments on Ti implants.Review Citation - WoS: 14Citation - Scopus: 16Advancing Titanium-Based Surfaces Via Micro-Arc Oxidation With Solid Substance Incorporation: a Systematic Review(Elsevier, 2024) Ogur, Ezgi; Alves, Alexandra C.; Toptan, FatihDespite possessing numerous superior properties, titanium, and its alloys exhibit inadequacies in terms of tribocorrosion, bioactivity, and antimicrobial characteristics. In recent years, there has been a rapid increase in research focusing on micro-arc oxidation (MAO) surface treatments to enhance these properties. In the traditional MAO approach, researchers commonly investigate the introduction of additional functionalities to the surface through ion doping. However, over the past decade, studies have indicated that the inclusion of solid substances, either as substitutes for or in conjunction with ion doping, can provide further advantages in terms of multifunctionality. Therefore, this review comprehensively and systematically examines the characteristics of solid substances used during MAO, their incorporation mechanisms, and their influence on resulting biological and degradation behaviors, as well as properties such as photocatalytic activity, magnetic features, hightemperature oxidation resistance, electrical insulation, and thermal shock resistance. This review showed that the integration of solid substances during MAO represents a promising avenue for achieving multifunctional surface enhancements in titanium and its alloys. This review highlights the diverse range of properties and behaviors influenced by these solid substances, offering insights for future research and applications in the field of surface engineering and biomaterials science.Article Citation - WoS: 1Citation - Scopus: 1Influence of Processing Method of Cocrmo Dental Alloy on the Corrosion Behavior in Artificial Saliva(Wiley, 2022) Pontes, Joana R.; Pinto, Ana M. P.; Ariza, Edith; Alves, Alexandra C.; Toptan, FatihRemovable or fixed dental frameworks are usually made of CoCr alloys. The CoCr dental alloys are produced traditionally by lost-wax casting. However, alternative processing routes, such as hot-pressing, are being studied for dental applications. The purpose of the present work was to assess the corrosion resistance of CoCrMo dental alloy produced by conventional lost-wax casting and hot-pressing. The corrosion behavior was studied in artificial saliva at 37°C by potentiodynamic polarisation tests. Immersion tests were performed to evaluate the growth of the passive film where electrochemical impedance spectroscopy was used at different immersion periods. Results showed slightly better corrosion resistance in terms of ipass for CoCrMo samples obtained by hot-pressing. On the other hand, the immersion tests showed a more stable and thicker passive film formed on hot-pressed CoCrMo dental alloy, pointing out that hot-pressing may be considered a promising technique to produce CoCrMo dental structures.