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access icon free Improvement of anti-tarnishing and anti-bacterial properties of silver by a waterborne polyurethane/silver nanocomposite coating

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% Na2S 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.

References

    1. 1)
    2. 2)
    3. 3)
    4. 4)
    5. 5)
    6. 6)
    7. 7)
    8. 8)
    9. 9)
    10. 10)
    11. 11)
      • 25. El-Sayed, A.A., Salama, M., Salem, T., et al: ‘Synergistic combination of reduction and polymerization reactions to prepare silver/waterborne polyurethane nanocomposite for coating applications’, Indian Journal of Science and Technology, 2016, 9, (17), pp. 110.
    12. 12)
      • 23. Chou, C.W., Hsu, S.H., Wang, P.H.: ‘Biostability and biocompatibility of poly(ether)urethane containing gold or silver nanoparticles in a porcine model’, J. Biomed. Mater. Res. A, 2008, 84, (3), pp. 785794.
    13. 13)
    14. 14)
    15. 15)
    16. 16)
    17. 17)
    18. 18)
    19. 19)
    20. 20)
    21. 21)
      • 6. Hu, W., Liu, Y., Zhu, R.J.: ‘Mechanism of tarnishing of silver plated wares and strategy to prevent it’, Mater. Prot., 2005, 38, (7), p. 36.
    22. 22)
    23. 23)
    24. 24)
    25. 25)
    26. 26)
      • 10. Laibinis, P.E., Palmer, B.J., Lee, S.-W., et al: ‘The synthesis of organothiols and their assembly into monolayers on gold’, in Ulman, A. (Ed.): ‘Thin Films’ (Academic Press, San Diego, CA, 1998), 24, pp. 143.
http://iet.metastore.ingenta.com/content/journals/10.1049/mnl.2017.0158
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