Abstract
The 50-kHz sonolysis of argon-saturated dimethyl sulfoxide (DMSO)-water mixtures was investigated by ESR and spin trapping with 3,5-dibromo-4-nitrosobcnzensulfonate (DBNBS). Two distinct product regions are observed. At low DMSO concentrations, methyl radicals are formed due to the reaction of hydroxyl radicals, generated by the thermal decomposition of water vapor in collapsing cavitation bubbles, which escape into the bulk of the solution and react with DMSO. The maximum CH 3 -DBNBS yield is observed near 0.1% DMSO (v/v)
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