Additive synthesis by sol-gel method for its use as antimicrobial

ROMINA ARRECHE; MARIA FLORENCIA HERNANDEZ; MIRTA BLANCO; VAZQUEZ, PATRICIA

Procedia Materials Science

Elsevier

Lugar: Amsterdam; Año: 2014

2211-8128

The antimicrobial activity of silver nanoparticles makes this chemical element attractive for their incorporation in different materials. Additionally, heteropolyacids (HPAs) have advantages as catalysts which make them environmentally very interesting. The objective of this work is to incorporate in a silica matrix obtained by sol-gel an HPA together with Ag, for their use as fillers in paints or adhesives. Six samples were synthesized, using tetraethyl orthosilicate, methyltrimethoxysilane, acetic acid, molydophosphoric acid and silver acetate. The silicas were characterized by potentiometric titration, XRD, SEM, TEM, SBET and FT-IR. When HPA is used instead of acetic acid, a variation on the final acidity is produced. The specific surface area decreases when HPA is incorporated into the silica synthesized using tetraethyl orthosilicate as precursor, noticing a slight increase when Ag is added because a different distribution of HPA in the matrix. By SEM, it was observed that the particle size is bigger when the silicas are synthesized with TEOS-HPA, but it still shows the characteristic morphology of bulk silica.