Open AccessProlonged antimicrobial activity of unique sandwich‐structured silver nanocomposites
Author(s) -
Dong Yaohua,
Liu Tao,
Song Xiao,
Dong Lihua,
Guo Zhangwei,
Shen Yuanyuan
Publication year - 2014
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2014.0106
Subject(s) - nanocomposite , materials science , mesoporous material , antibacterial activity , antimicrobial , silver nanoparticle , transmission electron microscopy , nanotechnology , chemical engineering , nuclear chemistry , nanoparticle , bacteria , chemistry , catalysis , organic chemistry , biology , engineering , genetics
In this reported work, silver (Ag) nanocomposites (NCs) with three different structures were prepared to confirm that structure has significant influence on the antibacterial properties. Ag nanoparticles (NPs) were prepared by the following three methods: first, by deposition of Ag on the surface of silica‐polydopamine spheres by reducing Ag cations (NC1), secondly, by encapsulation of Ag NPs in mesoporous SiO 2 with a core–shell structure (NC2) and thirdly, Ag nanocrystals were both decorated on the surface of SiO 2 and incorporated into its mesoporous structure (NC3). The key to the successful synthesis of the aforementioned NCs was polydopamine (PD) having the unique reductive ability and powerful adhesive capability. The antibacterial activities of NC1, NC2 and NC3 were evaluated through bacterial growth curves assay carried out on Vibrio natriegens ( V. natriegens ) strain, a Gram‐negative bacterium, supported by observations from transmission electron microscopy. The results demonstrated that in the first three days, the effect of NC1 was more intense on V. natriegens compared with NC2; however, the next seven days revealed the opposite result. Therefore NC3 exhibited the most effective antimicrobial treatments for ten days.