Multiple Emulsion Templating of Hybrid Ag/SiO2 Capsules for Antibacterial Applications
authors Sousa, FL; Almeida, A; Girao, AV; Fateixa, S; Trindade, T
nationality International
journal PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
author keywords antimicrobials; cationic release; emulsions; silica; silver nanoparticles
keywords ESCHERICHIA-COLI; SILVER NANOPARTICLES; SILICA MICROSPHERES; GOLD NANOPARTICLES; HOLLOW SPHERE; MICROCAPSULES; RELEASE; ENCAPSULATION; PARTICLES; COLLOIDS
abstract Silver nanoparticles (NPs) encapsulated in amorphous silica shells are synthesized and evaluated for their antibacterial action using the Gram-negative Escherichia coli bacterium. These inorganic capsules are synthesized using a new approach that comprises the use of oil-in-water-in-oil (O/W/O) multiple emulsions to fabricate SiO2 capsules incorporating organically capped Ag NPs. This strategy is explored as a mean to promote the bioadhesion of the microorganisms to the silica rough surfaces while still keeping the system with a high surface area for the active metal. The results have shown that the hybrid capsules enable a slow release of cationic silver from the interior of the silica microsphere to the external medium probably through the pore channels in the shell. The antibacterial activity against E. coli is mainly determined by the Ag+ ion release rate, suggesting that these particulates can be employed as a robust system for prolonged used as an antimicrobial material.
publisher WILEY-V C H VERLAG GMBH
issn 0934-0866
year published 2015
volume 32
issue 5
beginning page 561
ending page 566
digital object identifier (doi) 10.1002/ppsc.201400168
web of science category Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
subject category Chemistry; Science & Technology - Other Topics; Materials Science
unique article identifier WOS:000354482700009
  ciceco authors
  impact metrics
times cited (wos core): 3
journal impact factor (jcr 2016): 4.474
5 year journal impact factor (jcr 2016): 3.776
category normalized journal impact factor percentile (jcr 2016): 77.333
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