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Surface characterization of Ti-Si-C-ON coatings for orthopedic devices : XPS an...
Oliveira, C.; Escobar Galindo, R.; Palacio, C.; Calderon Velasquez, S.; Almeida, B. G.; Henriques, Mariana; Espinosa, A.; Carvalho, S.Ti–Si–C–ON films were deposited by DC reactive magnetron sputtering and their chemical properties, biofilm formation and toxicity were characterized. Based on the films composition three different growth regimes were identified on the films; (I) N/Ti = 2.11 (high atomic ratio) and low oxygen content; (II) 0.77 ≤ N/Ti ≤ 1.86 (intermediate atomic ratio) and (III) N/Ti ≤ 0.12 (low ratio) and high oxygen content. T...
Extension model of lactation curves to evaluate the effect of the recombinant b...
Palacios-Espinosa,A.; Espinoza-Villavicencio,J.L.; de Luna,R.; Guillén,A.; Avila,N.Y.An extension model of lactation curves was used to determine the effect of recombinant bovine somatotropin (bST-r) on milk yield in Holstein dairy cattle. This model use the fitted values obtained by the Wood model, and was tested on the records of 66 cows. The milk yield predicted with the extension model and the observed yield were compared and no significant differences were observed (P>0.05). Once the exten...
Influence of the surface morphology and microstructure on the biological proper...
Oliveira, Cristina; Escobar Galindo, R.; Palacio, C.; Vázquez, L.; Espinosa, A.; Almeida, B. G.; Henriques, Mariana; Oliveira, Rosário; Carvalho, S.Detailed structural, microstructural, biofilm formation and cytotoxicity studies were performed on Ti-Si-C-ON hard coatings prepared by dc reactive magnetron sputtering, in order to evaluate the relation among these properties. Compositional analysis showed the existence of two distinct regimens; regime I: high C/Si atomic ratio (C/Si ≥1,42) and intermediate N/Ti atomic ratio; regime II: low C/Si atomic ratio (...
Structure-property relations in ZrCN coatings for tribologic applications
Silva, E.; Figueiredo, M. Rebelo; Franz, R.; Escobar Galindo, R.; Palacio, C.; Espinosa, A.; Calderon Velasquez, S.; Mitterer, C.; Carvalho, S.ZrCN coatings were deposited by dc reactive magnetron sputtering with N2 flows ranging from 2 to 10 sccm in order to investigate the influence of the nitrogen incorporation on structure and properties. Information about the chemical composition was obtained by glow discharge optical emission spectroscopy and Rutherford backscattering spectroscopy. The evolution of the crystal structure studied by X-ray diffract...
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