Abstract
Silver (Ag) objects tarnish when expose to the human sweat or atmospheres polluted by sulphide. In this work, a waterborne and transparent polyurethane/Ag (WPU/Ag) nanocomposite was synthesised and applied on the surface of the Ag sample with enhanced anti-bacterial and also protection against the tarnishing in the corrosive solutions. Ag nanoparticle in the WPU/Ag was investigated by field-emission scanning electron microscopy and transmission electron microscopy. To study the anti-tarnishing behaviour of the Ag samples, the bare as well as the coated samples were immersed in corrosion solution of 0.35 wt% Na 2 S which is a simulating solution of the human sweat. The corrosion products were then studied with X-ray diffraction and energy-dispersive X-ray spectroscopy. The bare Ag surface was covered completely by a black layer after 60 min immersion in the corrosion solution. However, the presence of either waterborne polyurethane (WPU) or WPU/Ag coatings was remained on the surface and protected the substrate from tarnishing. Anti-bacterial properties of the samples were determined by disc diffusion and the minimum inhibitory concentration methods. Anti-bacterial effect of the Ag coated by WPU/Ag was greater than the bare substrate, whereas the WPU coating lost the anti-bacterial effect of the Ag substrate.
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