Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

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  • Article
    Ti-Cu Dry Electrodes for Biomedical Sensing: Tribocorrosion Performance Under Simulated Skin Conditions
    (Elsevier, 2025) Alves, A. C.; Lopes, C.; Camarinha, A.; Geraldo, D.; Toptan, F.; Ferreira, A.; Vaz, F.
    Monitoring electromyographic (EMG) activity is crucial for diagnosing musculoskeletal disorders and understanding neuromuscular systems. Dry electrodes represent a significant advancement over traditional wet electrodes by eliminating the need for gels, thereby extending lifespan, simplifying skin preparation, and facilitating prolonged remote monitoring. However, challenges such as higher impedance and susceptibility to motion artifacts, along with issues of user discomfort and signal distortion, persist with existing metal-coated or entirely metal dry electrodes. This study explores an alternative approach using Ti-Cu thin films deposited on polymeric substrates to enhance electrical, electrochemical, and tribo-electrochemical properties. The research specifically investigates the corrosion and tribocorrosion behaviour of these Ti-Cu thin films in an artificial sweat environment, comparing them to pure Ti and Cu films. Chemical, microstructural, topographical, and electrical characterizations were conducted, alongside evaluations of electrochemical and tribo-electrochemical behaviour. The results indicate that while all films showed rupture under sliding, TiCu0.34 thin films exhibited superior corrosion resistance due to their unique microstructure. This study suggests that TiCu0.34 electrodes may offer a promising balance between corrosion resistance and electrical performance for wearable applications, although improvements in adhesion are necessary to withstand mechanical loads.
  • Article
    Citation - WoS: 8
    Citation - Scopus: 10
    Impact of Simulated Inflammation and Food Breakdown on the Synergistic Interaction Between Corrosion and Wear on Titanium
    (Elsevier, 2024) Lima, A.R.; Pinto, A.M.P.; Toptan, F.; Alves, A.C.
    This paper investigates the impact of lactic acid and phosphoric acid additives in artificial saliva (AS), simulating inflammation and food breakdown, on the electrochemical and tribo-electrochemical behavior of titanium. The results showed that, unlike lactic acid, phosphoric acid significantly reduced corrosion resistance, mainly due to local damage and heterogeneities on the passive film. Non-additivated AS caused greater wear volume loss, with mechanical wear identified as the main mechanism. However, when additives were present, a synergistic interplay between corrosion and wear was observed. The study concludes that prolonged exposure to food breakdown could accelerate material degradation in titanium. © 2024 Elsevier Ltd