Please use this identifier to cite or link to this item: https://hdl.handle.net/10316/115676
Title: Ex-vivo studies on friction behaviour of ureteral stent coated with Ag clusters incorporated in a:C matrix
Authors: Carvalho, Isabel 
Faraji, Mostafa
Ramalho, Amílcar
Carvalho, António
Carvalho, Sandra 
Cavaleiro, Albano 
Keywords: Ag/a:C; Inert gas condensation; Friction; Ureteral stent
Issue Date: 4-Apr-2018
Publisher: Elsevier
Project: Erasmus Mundus MSc course TRIBOS – Joint European Mater in Tribology of Surface and Interfaces – 532535-1-SI-2012-1-ERA MUNDUS-EMMC 
Portuguese national funds through FCT-Fundação para a Ciência e a Tecnologia, under the project PTDC/CTM-NAN/4242/2014, “Clusters bimetálicos para ação antimicrobiana controlada em stents” 
MATIS - Materiais e Tecnologias Industriais Sustentáveis (CENTRO-01-0145-FEDER-000014) and ERA-SIINN/0004/2013 project 
metadata.degois.publication.title: Diamond & Related Materials
metadata.degois.publication.volume: 86
Abstract: Coated ureteral stents must be placed in the human body without hurting the body tissue and, simultaneously, support the application without degrading the top active layer. In this work Ag clusters incorporated in a:C (Ag/ a:C) matrix were produced by plasma gas condensation process. After optimizing some deposition parameters, as cluster source pressure and power density, two different clusters sizes were obtained 11 ± 2 nm using cluster source pressure of 100 Pa, and a bimodal size using cluster source pressure of 200 Pa (31 ± 22 nm and 260 ± 135 nm). Ag/a:C coatings showed a total adhesion to substrate, without delamination of the film, even after a month of immersion in distilled water. The friction coefficient of the coatings and the uncoated reference were determined and show a reduction from 0.22 for the reference stent to 0.12 for the Ag/a:C coated stents produced at 100 Pa and to 0.16 for the Ag/a:C coated stents produced at 200 Pa.
URI: https://hdl.handle.net/10316/115676
DOI: 10.1016/j.diamond.2018.03.035
Rights: openAccess
Appears in Collections:I&D CEMMPRE - Artigos em Revistas Internacionais

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