Effects of primary C1–C6 linear alcohol addition and sonochemically decomposed products on multi-bubble sonoluminescence

Abstract

Multi-bubble sonoluminescence (MBSL) was measured in Ar-saturated water containing 2 mmol dm −3 of a series of alcohols under sonication at a frequency of 410 kHz. The sonoluminescence intensity was weakened in the presence of the alcohols. The effect was emphasized further when an alcohol with a longer alkyl chain was added. The spectral and temporal changes are presumed to be attributable to gaseous products generated by sonochemical decomposition of alcohols. Gas generation, originating from alcohol decomposition, was observed even in the short 2 min sonication. When compared with the case of ethanol addition, larger amounts of gaseous products were generated when long chain 1-hexanol was added. The increase in gaseous product yield indicates that the alcohol decomposition proceeds with the progress of the sonication. The present study evaluated the dependency of MBSL on the hydrophobicity of added alcohol and characteristics of the decomposed gas products, such as solubility to water and specific heat ratio.

Ultrasonic Activation of Water-Soluble Au25(SR)18 Nanoclusters for Singlet Oxygen Production

“…To clarify the ultrasonic activation mechanism of Au NCs, we examined sonoluminescence from the aqueous solution of Au NCs. An instrument for sonication with a highly sensitive luminescence detector was used, and the sample cells were equipped with ultrasonic transducers . This instrument is schematically shown in Figure a.…”

“…An instrument for sonication with a highly sensitive luminescence detector was used, and the sample cells were equipped with ultrasonic transducers. 55 This instrument is schematically shown in Figure 4a. Figure 4b shows the sonoluminescence spectrum from water under ultrasonication (430 kHz, 30 W).…”

Effect of ultrasonic frequency and surfactant addition on microcapsule destruction

“…The contraction rate is high owing to the Rayleigh contraction, and during collapse, the inside of the bubble is subjected to high temperatures and pressures [9] , [10] , [11] . Light, known as sonoluminescence (SL), is emitted during cavitation and may provide information about bubble activity [12] , [13] , [14] , [15] , [16] , [17] . The huge number of cavitation bubbles that are generated move in a complex manner, repeatedly splitting and coalescing, owing to the ultrasonic radiation pressure, the flow of the liquid, the force exerted by the pressure gradient of the sound field, and the forces of attraction and repulsion acting between the bubbles.…”

Mechanism for ultrasonic pitting of starch particles

“…[7][8][9] In addition, this local field may cause luminescence. [10][11][12] Using these effects, ultrasonic cavitation has been applied in several fields, including ultrasonic cleaning, emulsification, and extraction. [13][14][15] In particular, ultrasonic cleaning is used widely in industry, and many ultrasonic devices have been developed for cleaning semiconductor elements and mechanical parts.…”