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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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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