Abstract
By incorporating titanium dioxide (TiO2) nanoparticles, assisted by ultrasound, it was possible to confer antibacterial properties to an ethylene-co-vinyl acetate (EVA) matrix. A systematic study of the ultrasonic process was performed to determine whether or not the sonication parameters have a significant effect on the nanoparticles dispersion and therefore, on the composite antibacterial property. Scanning electron microscopy showed a significant difference in the TiO2 agglomerate size when sonication was applied instead of mechanical dispersion. In addition, the TiO2 nanoparticles efficiency to inhibit bacterial growth was demonstrated by comparing the measurements of colony forming units as a function of the dispersion treatment. It was found that the combination of 60% pulse and 60% amplitude were the best conditions to reduce Escherichia coli growth.
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