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- W2315248924 abstract "Contemporary studies indicate that reactive oxygen species (ROS) such as superoxide play a key role in the toxicity and behavior of silver nanoparticles (AgNPs). While there have been suggestions that superoxide is able to reduce silver(I) ions with resultant production of AgNPs, no experimental evidence that this process actually occurs has been produced. Here we present definitive experimental evidence for the reduction of silver(I) by superoxide. A second-order rate constant of 64.5 ± 16.3 M(-1)·s(-1) is determined for this reaction in the absence of AgNPs. The overall rate constant, however, increases by at least 4 orders of magnitude in the presence of AgNPs. A model based on electron charging and discharging of AgNPs satisfactorily describes the kinetics of this process. The ability for AgNPs to undergo catalytic cycling provides a pathway for the continual generation of ROS and the regeneration of AgNPs following oxidation." @default.
- W2315248924 created "2016-06-24" @default.
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- W2315248924 date "2011-01-25" @default.
- W2315248924 modified "2023-10-05" @default.
- W2315248924 title "Superoxide-Mediated Formation and Charging of Silver Nanoparticles" @default.
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- W2315248924 doi "https://doi.org/10.1021/es103757c" @default.
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