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Long-Term Antibacterial Coatings with Core–Shell [email protected]2 Colloid

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Well-defined core–shell [email protected]2 colloids were prepared and used as an antibacterial agent in epoxy resin coatings. [email protected]2 colloid with Ag concentration up to 1728 mg/L still kept monodispersion and was stable even after 3 months without sedimentation. Thickness of silica shell of the as-prepared colloid could be controlled at 5 nm, 10 nm and 15 nm by adjusting the appropriate Ag precursor/TEOS (tetraethoxysilane) molar ratio. The thicker silica shell was helpful to maintain core–shell structure. Release of Ag ion from the core–shell structure was very slowly, the release amounts only reached 49.2% after 485 days. The antibacterial effect of the coating was evaluated by varying of Ag concentration and storage time. Very lower amount of Ag in the coating exhibited prompt and fatal antibacterial activity, the efficiency of coating with 0.02 wt% Ag reached as high as 99.99% after 8 h incubation. The coating presented antibacterial efficiencies of 99.99% for both G bacterial E. coli and G+ bacterial S. aureus. Moreover, such a coating displayed excellent long-term sustainable antibacterial activity, which could achieve efficiency of 99.99% after stored for 415 days.
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Keywords: Ag+ Release; Antibacterial Activity; Core–Shell [email protected]; Stability

Document Type: Research Article

Affiliations: State Key Laboratory of Organic–Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, P. R. China

Publication date: November 1, 2018

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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