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3931 |
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Wednesday, May 21, 2014, Hall A 2:40 PM Comparision Thermal Spraying VS. other Surface Technologies |
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Surface morphology and bioactivity of copper alloy coatings |
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Larry Pershin* / University of Toronto, Canada Romina Shafaghi / University of Toronto, Canada Javad Mostaghimi/ Univesity of Toronto, Canada Maurice Ringette/ Univesity of Toronto, Canada |
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Hospital acquired infections due to bacterial contamination in hospitals are often life-threatening, require prolonged hospitalisation. Several studies have confirmed that copper and its alloys have effective antimicrobial properties. Hence, the coating of surfaces with copper-based alloys could provide a non-toxic and cost effective way of reducing bacterial contaminations. Our studies were focused on bioactivity evaluation of wire arc sprayed Cu-Ni-Zn alloy coating deposited on the heat sensitive surfaces such as wood and biocomposites. The biocidal activity of the coatings was compared to a sheet metal with similar composition using Escherischia coli and Staphylococcus epidermidis bacteria. Results show that higher surface roughness of the coating significantly enhance biocidal properties of the coating, it was observed that bacteria had ruptured membrane after just 0.5 hour exposure compare to 2 hours for brass sheet. Effect of the various surface roughness and morphology on the surface biocidal activity will be presented. |