P20 メチルラジカル再結合法によるキャビテーションバブル温度の推定 : 溶存希ガスの影響(ポスターセッション)

概要

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When an ultrasound is irradiated to the liquid, the micro bubble which is called cavitation bubble is formed. It is thought that the state of bubble becomes thousands of temperature and hundreds of pressures when this bubble collapses. Various chemical effects are induced by the hot and high pressure field. In this study, the bubble temperature estimated as the basic research of sonochemistry. Since it is difficult to measure bubble temperature directly, indirect method with a reaction kinetics was used for estimating the temperature by the generation ratio of the hydrocarbons which are produced by the methyl radical recombination. To prepare t-butanol solutions (2-30mM) 60ml of water is degassed with argon gas in the sonication cell. After the degassing, t-butanol was added into the water. These samples were irradiated by ultrasound of 200kHz and the solution temperature was kept at 20℃. The reaction products were analyzed by a gas chromatography. After the sonication, in solution with concentration 2 to 12mM, the bubble temperature became a constant or maximum value in the range from 5 to 20 minutes. It was found that the relation between each t-butanol concentration and the maximum bubble temperature was in the good linear relation. Extrapolating the linear part of a maximum temperature to 0mM, the temperature becomes about 4200K.
日本ソノケミストリー学会の論文
2006-10-27