5 documents found, page 1 of 1
Comparison of the electrochemical response of carbon-fiber-reinforced plastic (...
Ofoegbu, Stanley Udochukwu; Ferreira, Mário Guerreiro Silva; Nogueira, Helena I. S.; Zheludkevich, MikhailNo abstract available.
Redução electroquímica de iões de terras raras e o seu efeito na corrosão de me...
Oliveira, Marco; Bastos, A.C.; Kallip, Silvar; Zheludkevich, Mikhail; Ferreira, M.G.S.RESUMO: Os iões de terras raras estão entre os inibidores de corrosão de nova geração mais promissores. No entanto, foram encontradas condições onde a corrosão é acelerada na presença destes iões [1]. O caso mais relevante devido à sua importância é o aumento da corrosão do zinco no par galvânico zinco-ferro. Esse aumento está associado a uma reacção catódica adicional inesperada que é observada nas curvas de p...
Small-angle neutron scattering and magnetically heterogeneous state in Sr2FeMoO6–δ
Kalanda, Nikolay; Garamus, Vasil; Avdeev, Mikhail; Zheludkevich, Mikhail; Yarmolich, Marta; Serdechnova, Maria; Wieland, D. C. FlorianSingle-phase strontium ferromolybdate (Sr2FeMoO6–δ) samples with different degrees of the superstructural ordering of the Fe/Mo cations were obtained from partially reduced SrFeO3–х, SrMoO4 precursors by the solid-state technology. The study of the temperature dependences of the magnetization measured in the field-cooling and zero-field-cooling regimes indicated an inhomogeneous magnetic state of the samples. T...
Biocompatible and biodegradable functional coatings with natural occurring mate...
Sousa, Isabel Cristina; Neves, Cristina; Fraga, Sónia; Teixeira, João Paulo; Scharnagl, Nico; Zheludkevich, Mikhail; Ferreira, M. G. S.; Tedim, JoãoMagnesium alloys are amidst the most innovative materials for biomedical applications, as they show a set of unique properties, namely appropriate mechanical properties and biodegradability, when compared to other alloys. Although these properties make them suitable for medical implants, the main challenge is the uncontrolled corrosion. Mg degradation is fast, inhomogeneous, localized and often accompanied by h...
New fluorinated diamond microelectrodes for localized detection of dissolved ox...
Silva, Eduardo; Bastos, A. C.; Neto, Miguel; Fernandes, Antonio Jose; Silva, Rui; Silva Ferreira, Mario Guerreiro; Zheludkevich, MikhailThe present work reports on a novel needle type oxygen microsensor based on boron doped diamond (BDD) with tailored surface aiming in better electrochemical performance. The microelectrodes are produced by growing diamond films using HFCVD (hot filament chemical vapor deposition) on top of electrochemically sharpened tungsten filaments. The diamond is functionalized using CF4 RF-plasma post-treatments resulting...