resumo
Metallic implants and devices are widely used in the orthopedic and orthodontic clinical areas. However, several problems regarding their adhesion with the living tissues and inflammatory responses due to the release of metallic ions to the medium have been reported. The modification of the metallic surfaces and the use of biocompatible protective coatings are two approaches to solve such issues. In this study, in order to improve the adhesion properties and to increase the corrosion resistance of metallic Ti substrates we have obtained a hybrid structure based on TiO2 nanotubular arrays and PDMS-TEOS films. TiO2 nanotubes have been prepared with two different diameters by means of electrochemical anodization. PDMS-TEOS films have been prepared by the sol-gel method. The morphological and the elemental analysis of the structures have been investigated by scanning electron microscopy and energy dispersive spectroscopy (EDS). Electrochemical impedance spectroscopy (EIS) and polarization curves have been performed during immersion of the samples in Kokubo's simulated body fluid (SBF) at 37 degrees C to study the effect of structure layers and tube diameter on the protective properties. The obtained results show that the modification of the surface structure of TiO2 and the application of PDMS-TEOS film is a promising strategy for the development of implant materials.
palavras-chave
SOL-GEL COATINGS; ION MICRO BATTERIES; TIO2 NANOTUBES; CORROSION BEHAVIOR; IMPEDANCE SPECTROSCOPY; STAINLESS-STEEL; TA6V ALLOY; NITI ALLOY; OXIDE; POLYDIMETHYLSILOXANE
categoria
Science & Technology - Other Topics; Materials Science; Physics
autores
Castro, AGB; Bastos, AC; Galstyan, V; Faglia, G; Sberveglieri, G; Salvado, IMM
nossos autores
António Alexandre Cunha Bastos
Investigador Auxiliar
Isabel Margarida Miranda Salvado
Professor associadoGrupos
G3 - Materiais Eletroquímicos, Interfaces e Revestimentos
G5 - Materiais Biomiméticos, Biológicos e Vivos
agradecimentos
This work has been supported by the FEDER funds, through the Program COMPETE, FCT (Fundacao para a Ciencia e Tecnologia) funds by the grant SFRH/BD/72074/2010 and the Italian Ministry of Education through the project FIRB 'Rete Nazionale di Ricerca sulle Nanoscienze ItalNanoNet' (Protocollo: RBPR05JH2P, 2009-2013). We also want to acknowledge the program which is financing CICECO at present, Pest-C/CTM/LA0011/2011.