Silver doped silica-methyl hybrid coatings. Structural evolution and antibacterial properties.

RAÚL A. PROCACCINI; SERGIO A. PELLICE

Activity Report 2011 - ABTLuS/LNLS

Editora Cubo

Lugar: Campinas; Año: 2012 p. 1 - 2

1518-0204

The development of antibacterial coatings for metallic substrates was studied. The coating consists in a hybrid organicinorganic sol-gel material doped with silver, obtained through the hydrolytic condensation of tetraethoxysilane (TEOS) and methyl-triethoxysilane (MTES). The relation between the structure of the hybrid matrix, aggregation state of silver ions and biocide behavior was analyzed as a function of the densifying thermal treatment. Coatings were deposited on glass substrates by the dip-coating process at a constant withdrawal rate of 25 cm/min and then thermal treated at 50, 100 and 200 oC. Small Angle X-ray Scattering (SAXS) experiments showed the presence of sub-nanometric particles for silver doped coatings and silica clusters for undoped hybrid materials. Also, bacteriological tests showed the inhibitory activity of silver doped coatings against Escherichia coli cultures.