Navegando por Autor "Martins, Leo Anderson Meira"
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Item Cell response and corrosion behavior of electrodeposited diamond-like carbon films on nanostructured titanium.(2013) Manhabosco, Taíse Matte; Martins, Leo Anderson Meira; Tamborim, Silvia Margonei Mesquita; Ilha, Mariana; Vieira, M. Q.; Guma, Fátima Costa Rodrigues; Muller, Iduvirges LourdesSurface characteristics such as roughness and contact angle of flat and nanostructured titanium samples and diamond-like carbon films (DLC) electrodeposited on the nanostructured samples were evaluated. Also, the mechanical properties and the corrosion resistance of the samples were evaluated in phosphate buffered saline (PBS). Biocompatibility was assessed by analyzing an in vitro cell culture. Nanostructured samples presented better cell biocompatibility. DLC deposited onto nanostructured samples remained with nanostructured morphology, presented high hardness and improved corrosion resistance compared to bare titanium. The DLC films electrodeposited from acetonitrile presented higher corrosion resistance in PBS solution when compared to DLC films deposited from N,N-dimethylformamide.Item Corrosion and cell viability studies of graphite-like hydrogenated amorphous carbon films deposited on bare and nitrided titanium alloy.(2014) Santos, Adélia Moreira Marques dos; Batista, Ronaldo Junio Campos; Martins, Leo Anderson Meira; Ilha, Mariana; Vieira, Moema Queiroz; Miquita, Douglas Rodrigues; Guma, Fátima Costa Rodrigues; Muller, Iduvirges Lourdes; Manhabosco, Taíse MatteThis work presents a study of corrosion resistance and cell viability of carbon films on bare and nitride Ti–6Al–4V. Films deposited on bare alloy significantly improve the corrosion resistance. Unexpectedly, films deposited on nitrided alloy present delamination and cracking after 16 days. We associate film failure with the presence of pores combined with a weak film/substrate interaction that allows diffusion of ions at the interface. We found that films tend to diminish the osteoblastic cell viability and the observed variations on film roughness do not improve cell viability.