Study on sonochemistry and sonoluminescence in a microreactor

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Sonochemistry, chemical effects of ultrasound, in a microreactor was studied by a microfluidic experiment using a 0.1 mm x 0.1 mm microchannel and a single-bubble cavitation experiment. The microfluidic results demonstrated that, at relatively low levels of power density, selecting a solution of dissolved gas degree of saturation (DOS) in the supersaturation range at atmospheric pressure resulted in higher yields per unit volume in the 1D space compared to that obtained from the 3D space. This effect is attributed to a decrease in the cavitation threshold of the 1D reaction system. The single-bubble results showed that the hydroxyl radical amount for a dancing bubble, where the single bubble was dancing below the lower threshold of pressure amplitude for sonoluminescence, was greater than that for a stable bubble. The results imply that the instability of bubbles significantly enhances sonochemical efficiency in liquid phase.