By a News Reporter-Staff News Editor at Life Science Weekly -- Research findings on Chalcogens are discussed in a new report. According to news reporting from Beijing, People's Republic of China, by NewsRx journalists, research stated, "Dissolution, aggregation, and reactive oxygen species (ROS) generation are three major processes that silver nanoparticles (AgNPs) undergo in aqueous environments. In this study, the effects of AgNP surface coatings on these three processes were systematically evaluated under three irradiation conditions (UV-365, UV-254, and xenon lamp) to advance knowledge on the environmental fate and photochemical kinetics of AgNPs."
The news correspondents obtained a quote from the research from Beijing Normal University, "The AgNPs used were (a) bare-AgNPs, (b) electrostatically stabilized citrate-AgNPs, and © sterically stabilized polyvinylpyrrolidone-AgNPs (PVP-AgNPs), and the light exposures greatly promoted the three processes. Both the 5-h released Ag(+) concentrations and the 2.5-h aggregation rate followed the order UV-365 >xenon lamp >UV-254 for all three types of AgNPs. For all irradiation conditions, the 5-h released Ag(+) concentration was highest for bare-AgNPs, followed by PVP-AgNPs and citrate-AgNPs; the 2.5-h aggregation rate was highest for bare-AgNPs, followed by citrate-AgNPs and PVP-AgNPs, which indicated that surface coating significantly determines the process kinetics of AgNPs. Under UV-365 irradiation, the bare-AgNPs generated superoxide and hydroxyl radicals, but the citrate-AgNPs yielded only superoxide radical, and the PVP-AgNPs did not generate any ROS."
According to the news reporters, the research concluded: "This study highlights the different fates and kinetic behaviors of AgNPs during photochemical interactions, providing important insight into the environmental implications of AgNP release."
For more information on this research see: Surface-coating-dependent dissolution, aggregation, and reactive oxygen species (ROS) generation of silver nanoparticles under different irradiation conditions. Environmental Science & Technology, 2013;47(18):10293-301. (American Chemical Society - www.acs.org; Environmental Science & Technology - www.pubs.acs.org/journal/esthag)
Our news journalists report that additional information may be obtained by contacting Y. Li, State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University , Beijing 100875, People's Taiwan. Additional authors for this research include W. Zhang, J. Niu and Y. Chen (see also Chalcogens).
Keywords for this news article include: Asia, Beijing, Chalcogens, Nanoparticle, Free Radicals, Nanotechnology, Oxygen Compounds, Emerging Technologies, Reactive Oxygen Species, People's Republic of China.
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