6 ソノルミネッセンス気泡の不安定性に及ぼす界面活性剤の影響

概要

論文の詳細を見る
Influence of surfactants on instability of a sonoluminescing single bubble (SB) is studied through stroboscopic observation of the bubble. A rectangular quartz glass cell of 56×56×70 mm^3 internal dimensions was used as the SB cell. The bottom of the cell was attached to a bolted Langevin-type transducer, which was driven by a function generator through an amplifier at 24.5105 kHz. Direct observation of bubble behavior was performed with a stroboscopic lamp of 90 ns full width pulse at half maximum. The results show that the surfactant additives of sodium dodecyl sulfate (SDS) promote a distortion of the spherical bubble surface. Therefore, upper stable bubble region with sonoluminescence (SL) became narrower as the concentration of SDS increased. Instead, the dancing bubble region became broader, where a bubble ejects tiny bubbles due to the evolution of surface distortion and dances by counteraction. Since the instability of bubble collapse is a key parameter for sonochemistry in bulk liquids, surfactant additives have potential for promoting sonochemical reactions in bulk liquids.
日本ソノケミストリー学会の論文