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| - Sonoluminescence Quenching in Aqueous Solutions Containing Weak Organic Acids andBases and Its Relevance to Sonochemistry
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| Abstract
| - Multibubble sonoluminescence from water was found to be quenched by the addition of low levels ofunsubstituted or 2-chloro-substituted aliphatic carboxylic acids and the aromatic solutes, phenol and aniline.In all cases, the sonoluminescence intensity could be restored to the level obtained in pure water by adjustingthe solution pH to a point where the solutes were completely in their ionized form. A comparison of thesonochemical decomposition of phenol at pH levels above and below its pKa revealed that only when thesolute was in its neutral form was there significant decomposition. It is shown that both the sonochemicaldecomposition of phenol and the sonoluminescence quenching by all solutes studied can be directly correlatedwith the amount of solute adsorbed at the bubble/solution interface. The relationship between sonochemicalactivity and sonoluminescence quenching by water-soluble organic solutes is discussed.
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