Influencia de las nanopartículas de Ag sobre las propiedades mecánicas y tribológicas y en el efecto citotóxico y bactericida de los recubrimientos de TaN(Ag)

Aida M. Echavarría; Sara Robledo; Gilberto Bejarano G.

doi:10.3989/revmetalm.085

Authors

Aida M. Echavarría Centro de Investigación, Innovación y Desarrollo de Materiales – CIDEMAT, Facultad de Ingeniería, Universidad de Antioquia https://orcid.org/0000-0003-0614-4841
Sara Robledo Programa de Estudio y Control de Enfermedades Tropicales – PECET, IMM-Facultad de Medicina, Universidad de Antioquia https://orcid.org/0000-0003-2752-4931
Gilberto Bejarano G. Centro de Investigación, Innovación y Desarrollo de Materiales – CIDEMAT, Facultad de Ingeniería, Universidad de Antioquia https://orcid.org/0000-0001-9800-7259

DOI:

https://doi.org/10.3989/revmetalm.085

Keywords:

Ag nanoparticles, Bactericidal effect, Biocompatible coatings, Citotoxicity, Magnetron sputtering

Abstract

In this work, a TaN(Ag) composite coating with different silver contents between 2.26 and 28.51 %at, were developed by the unbalanced magnetron sputtering technique. The coating with the best balance presented between tribological and mechanical properties was chosen, and it was subjected to thermal treatments cycles with temperatures among 175 °C and 275 °C to allow the nucleation, growth and controlled diffusion of Ag nanoparticles up to the coating surface; the size, distribution and density of nanoparticles on the coating surface and their influence on the mechanical and tribological properties, were verified. The bactericidal effect against P. aeruginosa by growth inhibition and adhesion test was studied, as well as the cytotoxic behavior on osteoblasts by MTT test. The TaN(Ag)-3 coating after thermal treatment at 200 °C during 4 min, increased the micro hardness of AISI 316L stainless steel from 2.6 GPa to 10.7GPa, and decreased the wear rate from 1.11x10^-3 mm³/N.m to 0.17x10^-12 mm³/N.m. This coating exhibited 100% of osteoblast cell viability, and an excellent performance to the inhibition of growth and adherence of P. aeruginosa.

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