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• W2023555726 abstract "The capping layer stabilizing silver nanoparticles (AgNPs) affects its aggregation, dissolution, and net disinfection action, especially under conditions of varying water composition, such as, pH, ionic strength and organic matter content. Herein, we correlate the silver ion (Ag+) release and reactive oxygen species (ROS) generation rates for AgNPs of varying functionalization to their net disinfection coefficient on Escherichia coli, under conditions of differing water chemistries. For electrostatically stabilized citrate-capped AgNPs, the rate of ROS generation, as measured using a fluorescent dye, is found to dominate over that of Ag+ release, especially for smaller sized AgNP suspensions (∼10 nm) at low pH (∼6.2). For these AgNPs, the ROS disinfection mechanism is confirmed to dominate net disinfection action, as measured by the live/dead assay, especially at low levels of organic matter. Steric stabilization of AgNPs by protein or starch-capped layers enables disinfection through reducing AgNP aggregation and promoting silver dissolution over ROS generation. We suggest the involvement of protons and dissolved oxygen in causing the independent formation of Ag+ and ROS, regardless of the AgNP capping layer. While protein-capping layers effectively stabilize AgNPs, the generated ROS is likely dissipated by interference with the bulky capping layer, whereas the interference is lower with citrate-capping layers. Steric stabilization of AgNPs enables disinfection within a wide range of water chemistries, whereas effective disinfection can occur under electrostatic stabilization, only at low NaCl (<1 mmol/L) and organic matter (<5 mg/L) levels." @default.
• W2023555726 created "2016-06-24" @default.
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• W2023555726 date "2014-01-01" @default.
• W2023555726 modified "2023-09-25" @default.
• W2023555726 title "Disinfection action of electrostatic versus steric-stabilized silver nanoparticles on E. coli under different water chemistries" @default.
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• W2023555726 doi "https://doi.org/10.1016/j.colsurfb.2013.08.027" @default.
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• W2023555726 hasPublicationYear "2014" @default.
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