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Investigation of the SiO2@Ag-based antibacterial agent: (a,b) Minimum inhibitory concentration (MIC) test against E. coli and B. subtilis; (c) XPS analysis of Ag NPs after treatment for MIC test; (d) FE-SEM image of the decayed morphology of the E. coli bacteria. The inset is the untreated E. coli used for the comparison. The scale bar is 1 μm; (e) Disk diffusion assay of SiO2@Ag coated on steel (round) and polyethylene (rectangular) versus E. coli.
