Antimicrobial ecological waterborne paint based on novel hybrid nanoparticles of zinc oxide partially coated with silver

The nanomaterial was prepared by the use of Flame Spray Pyrolysis process obtaining nanoparticles of about 35 nm coated with ca. 5% (w/w) of silver (Ag). Antimicrobial trials showed that these ZnO-Ag nanoparticles has a potential effect against different bacteria (Staphylococcus aureus, Pseudomona spp, Salmonella spp, Bacillus subtilis, Listeria monocytogenes) and molds as Aspergillus niger. Furthermore, these nanoparticles were evaluated as an antimicrobial waterborne paints additive, and formulations with 0,15% (w/w) showed >5 mm inhibition zone against the main bacteria and molds tested.