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

Young Seon Ko, Yun Haeng Joe, Mihwa Seo, Kipil Lim, Jungho Hwang, Kyoungja Woo

Research output: Contribution to journalArticle

35 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)6714-6722
Number of pages9
JournalJournal of Materials Chemistry B
Volume2
Issue number39
DOIs
Publication statusPublished - 2014 Oct 21

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)

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