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Our results suggest that adhesion of S epidermidis and P aeruginosa are dependent on pyrolytic carbon surface free energy and roughness, although S aureus adhesion appears to be independent of these factors. Improvement of pyrolytic carbon physicochemical properties thus could lead to a reduction in valvular prosthetic infections.

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During brass oxidation, a copper diffusion is observed at the zinc oxide/metal interface, in the case of high temperature oxidation (T > 400 °C). Optical methods like FTIR and photoluminescence are used to characterize the oxidized form of copper located at metal—oxide interface. Detection of the vibrational transverse mode at 610 cm−1 and luminescence emissions attributed to copper and oxygen vacancies allow the characterization of copper oxidized form (copper I oxides) located at metal/oxide interface in agreement with SIMS results. But, the displacement reaction (Cu2O + Zn → 2 Cu + ZnO) could also occur according to thermodynamic data; so, the copper is in the oxidized form and eventually metallic.