Síntesis de Sílice Mediante el Método sol-gel y su Aplicación como Aditivos Antimicrobianos en Pinturas Higiénicas

Abstract

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 attractive. The objective of this work is to incorporate in a silicium matrix obtained by sol-gel an HPA together with Ag for their use as fillers in paints or adhesives. Six samples were synthesized, using TEOS, MTMS, acetic acid, phosphomolybdic acid and silver acetate. The silicas were characterized by potentiometric titration, XRD, SEM, TEM, SBET and FT-IR. When HPA is used instead AAc, a variation on final acidity is produced. The specific surface area
decreases when HPA is incorporated on TEOS-silica, noticing a slight increase when Ag is added because a different distribution of HPA on the matrix. By SEM, the particles size is bigger when the silicas are synthesized with TEOS-HPA,
but it still shows the characteristic morphology of bulk silica.