resumo
Bioactive glasses are osteoproductive-type inorganic materials possessing the highest indices of bioactivity in both bulk and thin film forms. The prerequisites for reliable implant-type coatings are both their biological and mechanical performances. Whilst the bioglass films' structural, chemical and biological properties have been studied extensively, information about their mechanical performance is scarce. Here, transmission electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, nanoindentation and pull-out measurements were employed to assess the morphological, chemical, structural and mechanical properties of the bioglass films deposited onto Ti substrates by radio-frequency magnetron sputtering (RF-MS). The biological safety of the thin bioglass films was evaluated preliminarily in vitro by investigating the adherence, proliferation and cytotoxicity of fibroblast cells cultivated on their surface. Our study emphasize the versatility of RF-MS, showing how bioglass films' features such as composition, structure, bonding strength, hardness, elastic modulus and biological response can be conveniently adapted by tuning the RF-MS working conditions, and therefore demonstrating the unexplored potential of this deposition technique for preparing quality biomimetic glass coatings. (C) 2013 Elsevier B. V. All rights reserved.
palavras-chave
BIOACTIVE GLASS COATINGS; IN-VITRO BEHAVIOR; MECHANICAL-PROPERTIES; MICROSTRUCTURE; TEMPERATURE; SUBSTRATE; STRONTIUM; IMPLANTS
categoria
Materials Science; Physics
autores
Popa, AC; Marques, VMF; Stan, GE; Husanu, MA; Galca, AC; Ghica, C; Tulyaganov, DU; Lemos, AF; Ferreira, JMF
nossos autores
Isabel Alexandra Fernandes Lemos
Bolseiro de pós-Doutoramento
José Maria da Fonte Ferreira
Professor(a) Jubilado(a)agradecimentos
A.C.P. and G. E. S. are thankful for the financial support of the Romanian National Authority for Scientific Research through the UEFISCDI TE49/2011 grant. The support from the CICECO (Portugal) and the BegbrokeNano (Oxford, UK) is acknowledged.