Abstract
We report here the synthesis of uniform nanospheres-like silver nanoparticles (Ag NPs, 5–10 nm) and the dumbbell-like Fe3O4-Ag hybrid nanoparticles (FeAg NPs, 8–16 nm) by the use of a seeding growth method in the presence of oleic acid (OA)/oleylamine (OLA) as surfactants. The antibacterial activity of pure nanoparticles and nanocomposites by monitoring the bacterial lag–log growth has been investigated. The electron transfer from Ag NPs to Fe3O4 NPs which enhances the biological of silver nanoparticles has been proven by nanoscale Raman spectroscopy. The lamellae structure in the spherulite of FeAg NPs/High Density Polyethylene (HDPE) nanocomposites seems to play the key role in the antibacterial activity of nanocomposites, which has been proven by nanoscale AFM-IR. An atomic force microscopy coupled with nanoscale infrared microscopy (AFM-IR) is used to highlight the distribution of nanoparticles on the surface of nanocomposite at the nanoscale. The presence of FeAg NPs in PE nanocomposites has a better antibacterial activity than that reinforced by Ag NPs due to the faster Ag+ release rate from the Fe3O4-Ag hybrid nanoparticles and the ionization of Ag NPs in hybrid nanostructure.
Highlights
The transmission of infectious diseases by bacteria in airports, hospitals and other public places has been increasing in the last few decades [1]
The main goal of this paper is to prepare hybrid silver nanoparticles with high antibacterial activity and the incorporated them in the polyethylene matrix and investigate their antibacterial activity
We show in this study that atomic force microscope (AFM)-IR and AFM-Raman can be used to investigate the nanoscale structure and the electron transfer in hybrid nanoparticles
Summary
The transmission of infectious diseases by bacteria in airports, hospitals and other public places has been increasing in the last few decades [1]. E. coli has been reported to lead to food poisoning [4,5]. The recent report approved that the antibacterial activity comes from silver ions (Ag+), not from metallic Ag [6]. Different components are combined with silver to yield a nanoentity with desired properties not afforded by their counterparts. A combination of Ferrite and silver is expected to enhance antibacterial activity due to the electron transfer between these two metals and enhances the release of silver ions, the main defense against the inactivation of bacteria and virus. The magnetic properties of ferrite lead to the formation of superparamagnetic composites which are useful in carcinoembryonic antigen in clinical immunoassay [11] and water treatment due to their enable easy separation from solution [12]
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