A reaction kinetics model of water sonolysis in the presence of a spin-trap.
The time development of the concentration of a spin-trapped OH radical was studied by electron spin resonance at various sound intensities and various 5,5-dimethyl-1-pyrroline N-oxide (DMPO) concentrations in water sonolysis. The lifetime of the spin-trapped OH radical was also studied, and factors governing sonolysis are discussed. We found that the production of spin-trapped OH radical increases with increasing ultrasound intensity. The lifetime of a spin-trapped OH radical decreases linearly with increase in sonication time. This result suggests that an unknown scavenger is produced by ultrasound. Based on the above results, we suggested a model of the reaction kinetics and estimated the production rate of OH radical from this model.
Department of Materials Science and Engineering, Yamagata University, Yonezawa 992, Japan. yanagi@ckpss.yz.yamagata-u.ac.jp
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Yanagida
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Masubuchi
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Minagawa
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Ogata
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Takimoto
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Koyama