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Significance Bulk water is a highly stable solvent, but water microdroplets possess strikingly different properties, such as the presence of hydroxyl radicals (•OH) at the microdroplet periphery. Previous studies demonstrated… Click to show full abstract
Significance Bulk water is a highly stable solvent, but water microdroplets possess strikingly different properties, such as the presence of hydroxyl radicals (•OH) at the microdroplet periphery. Previous studies demonstrated the recombination of •OH into H2O2 molecules and the capture of •OH by oxidizing other molecules, but the origin of the •OH has been a controversial topic with clear evidence that •OH can arise from external gases in contact with the microdroplet surface but also from the formation of the microdroplet itself. This study shows that the latter can primarily arise from contact electrification, which is shown to be a universal phenomenon for water–solid interfaces.
Journal Title: Proceedings of the National Academy of Sciences of the United States of America
Year Published: 2022
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