Abstract
USING SENSITIVE FLUOREScence spectroscopy, chemists at the University of Illinois, Urbana-Champaign, have made the first direct measurements of energy dissipation and reaction rates inside an isolated in water driven to violent size oscillations by high-intensity ultrasound. The results of postdoc Yuri T. Didenko and chemistry professor Kenneth S. Suslick suggest that a cavitating could be thought of as a high-temperature, high-pressure microreactor and have important implications for future work on ultrasound-driven chemistry { Natare , 418 , 394 (2002)}. However, Didenko and Suslick conclude that the endothermic reactions limit the temperatures that can be achieved inside a cavitating bubble. The maximum temperature for single-bubble cavitation is generally expected to be below 20,000 K-far less than the 1 million K needed for the tabletop bubble fusion in a cavitating deuteroacetone system that was reported in a controversial Science paper earlier this year (C&EN, March 11, page 11). Th...
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