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Advanced surface characterization of silver nanocluster segregation in Ag-TiCN ...
Escobar Galindo, R.; Manninen, N. K.; Palacio, C.; Carvalho, S.Surface modification by means of wear protective and antibacterial coatings represents, nowadays, a crucial challenge in the biomaterials field in order to enhance the lifetime of bio-devices. It is possible to tailor the properties of the material by using an appropriate combination of high wear resistance (e.g., nitride or carbide coatings) and biocide agents (e.g., noble metals as silver) to fulfill its fina...
Ag+ release inhibition from ZrCN–Ag coatings by surface agglomeration mechanism...
Calderon Velasquez, S.; Escobar Galindo, R.; Benito, N.; Palacio, C.; Cavaleiro, A.; Carvalho, S.Published 17 July 2013 ; New multifunctional materials based on well-established materials to which functional properties are added, such as antibacterial performance, have become a relevant research topic, in order to meet the requirements of today's technological advances. This paper reports the results of a detailed structural and chemical characterization study of ZrCN–Ag coatings produced by reactive magn...
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...
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...
Structural and mechanical properties of Ti–Si–C–ON for biomedical applications
Guimarães, Freddy; Oliveira, Cristina; Sequeiros, Elsa; Torres, Marta; Susano, M.; Henriques, Mariana; Oliveira, Rosário; Escobar Galindo, R.Ti–Si–C–ON films were deposited by DC reactive magnetron sputtering using different partial pressure of oxygen (pO2) and nitrogen (pN2) ratio. Compositional analysis revealed the existence of two different growth zones for the films; one zone deposited under low pO2/pN2 and another zone deposited under high pO2/pN2. The films produced under low pO2/pN2 were deposited at a lower rate and presented a fcc structur...
XRD and FTIR analysis of Ti–Si–C–ON coatings for biomedical applications
Oliveira, Cristina; Gonçalves, L. M.; Almeida, B. G.; Tavares, C. J.; Carvalho, S.; Vaz, F.; Escobar Galindo, R.; Henriques, Mariana; Susano, M.Ti–Si–C–ON films were deposited by DC reactive magnetron sputtering using different partial pressure ratio of oxygen (pO2) and nitrogen (pN2). Compositional analysis revealed the existence of three different growth zones for the films; (I) N/Ti = 2.1 (high atomic ratio) and low oxygen content; (II) 0.76 < N/Ti < 2.1 (intermediate atomic ratio) and (III) N/Ti ≤ 0.12 (low ratio) and high oxygen content. For high ...
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