Prompt and synergistic antibacterial activity of silver nanoparticle-decorated silica hybrid particles on air filtration

作者：Ko Young Seon; Joe Yun Haeng; Seo Mihwa; Lim Kipil; Hwang Jungho; Woo Kyoungja^*

来源：Journal of Materials Chemistry B, 2014, 2(39): 6714-6722.

DOI：10.1039/c4tb01068j

There is a significant need for materials that promptly exhibit antimicrobial activity upon contact. The large-scale fabrication of monodisperse silver nanoparticle (AgNP)-decorated silica (AgNP@SiO2) hybrid particles, and their prompt and synergistic antibacterial activity against both the Gram-negative bacteria Escherichia coli and the Gram-positive bacteria Staphylococcus epidermidis on air filtration units are presented. Monodisperse aminopropyl-functionalized silica colloids (406 nm) were used as a support material and were hybridized with AgNPs using a seeding, sorting-out, and growing strategy with Ag seeds (1-2 nm) into similar to 30 nm AgNPs, successfully yielding 51 g of AgNP@SiO2 hybrid particles. Medium filter samples (glass fiber material, 4 x 4 cm(2)) were coated with AgNP@SiO2 particles and tested for antibacterial efficacy. SEM characterization of the bacterial morphology suggested prompt and synergistic antibacterial activity against both classes of bacteria. Moreover, antibacterial efficacies %26gt;99.99% for both bacteria were obtained using a filter sample with a coating areal density of 1 x 10(8) particles per cm(2). Solutions of AgNP@SiO2 at 1.3% were stable even after 8 months. The hybrid particle AgNP@SiO2 and the air filter system coated with the particles are expected to be useful for future green environment applications.

• 出版日期2014-10-21