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Sunday, 22 September 2019
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Raw materials & technologies, Technologies, Nanotechnology

Silver doped hybrid coatings affect antibacterial properties

Friday, 11 July 2014

In a work, researchers analysed the effect of silver doping on the organic-inorganic hybrid structure of sol-gel coatings and its performance as bactericidal materials.

One more evidence shows the antibacterial properties of silver

Source: Fotolia/Luftbildfotograf

One more evidence shows the antibacterial properties of silver

Source: Fotolia/Luftbildfotograf

In a work, researchers analysed the effect of silver doping on the organic-inorganic hybrid structure of sol-gel coatings and its performance as bactericidal materials.

They synthesised the coatings through the hydrolytic condensation of tetraethoxysilane (TEOS) and methyl-triethoxysilane (MTES); silver nitrate was used as a source of Ag+ions.

Tests verified activity against E. coli cultures

The structural analysis, performed through Small Angle X-ray Scattering (SAXS) with synchrotron light, Fourier Transformed Infrared (FTIR) and UV-visible spectroscopies, revealed the complex scenario developed as the network crosslinking rises during the thermal treatment. The matrix structure works as a size-selective membrane where only the smaller silver clusters and ions are released to the surface while the higher nanoparticles remain trapped inside. Finally, bacteriologic analysis, performed with Escherichia coli cultures, confirmed a tight correlation between silver lixiviation and the inhibition halos observed in agar diffusion tests.

The study is published in: Surface and Coatings Technology, Volume 244, 15 April 2014, Pages 92-97.

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