Development of Silver Clusters in Hybrid Organic-Inorganic Sol-Gel Materials for Biocide Coatings

RAÚL A. PROCACCINI; SILVIA M. CERÉ; SERGIO PELLICE

Campinas

Encuentro; 22ª Reunião Anual de Usuários do LNLS; 2012

LNLS-CNPEM

A silver doped hybrid organicinorganic solgel coating was developed through the hydrolytic condensation of tetraethoxysilane (TEOS) and glycidoxypropyl- trimethoxysilane (GPTMS) or methyl-triethoxysilane (MTES). Silver nitrate was added as the supplier of Ag+ ions, which have a potential e®ffect as a biocide com- ponent. Synthesis of precursor sol and the evolution of silver clusters in the whole process were analyzed through Attenuated Total Reffectance Fourier Transformed Infrared spectroscopy (ATR-FTIR) and UVvisible spectroscopy. A high thermal sensitivity of sub-nanometric silver particles was determined by Small Angle X-ray Scattering (SAXS) carrying to formation of higher agglomerates or silver nanoparticles. Lixiviation tests show long-term and gradual silver releasing without worsening of the structural integrity of coatings. Complete results were recently published at: Surface and Coatings Technology 205, 5464-5469, 2011.