Issue 39, 2014

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

Abstract

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 ∼30 nm AgNPs, successfully yielding 51 g of AgNP@SiO2 hybrid particles. Medium filter samples (glass fiber material, 4 × 4 cm2) 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 >99.99% for both bacteria were obtained using a filter sample with a coating areal density of 1 × 108 particles per cm2. 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.

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

Supplementary files

Article information

Article type
Paper
Submitted
01 Jul 2014
Accepted
08 Aug 2014
First published
08 Aug 2014
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. B, 2014,2, 6714-6722

Author version available

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

Y. Ko, Y. H. Joe, M. Seo, K. Lim, J. Hwang and K. Woo, J. Mater. Chem. B, 2014, 2, 6714 DOI: 10.1039/C4TB01068J

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