Acoustic emission spectra from 515 kHz cavitation in aqueous solutions containing surface-active solutes
Acoustic emission spectra from 515 kHz cavitation in aqueous solutions containing surface-active solutes
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DOI：
10.1021/ja067960r
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发表时间：
2007-02-28
影响因子：
15
通讯作者：
Price, Gareth J.
中科院分区：
文献类型：
--
作者：
Ashokkumar, Muthupandian;Hodnett, Mark;Price, Gareth J.
通过监测溶液的声发射，研究了在515 kHz下向水中加入表面活性溶质的效果。在低浓度（<3mM）下，十二烷基硫酸钠引起声发射光谱的显著变化，这可以解释为防止气泡聚结和空化气泡云内气泡的去簇。通过在背景电解质存在下以及使用非离子表面活性剂进行实验，揭示了静电效应的重要性。研究结果为解释表面活性溶质对声空化效应的影响以及声化学机理提供了进一步的机理证据。这项工作将是有价值的，许多研究人员，使他们能够优化反应和工艺条件的声化学系统。
The effect of adding surface-active solutes to water being insonated at 515 kHz has been investigated by monitoring the acoustic emission from the solutions. At low concentrations (< 3 mM), sodium dodecyl sulfate causes marked changes to the acoustic emission spectrum which can be interpreted in terms of preventing bubble coalescence and declustering of bubbles within a cavitating bubble cloud. By conducting experiments in the presence of background electrolytes and also using non-ionic surfactants, the importance of electrostatic effects has been revealed. The results provide further mechanistic evidence for the interpretation of the effect of surface-active solutes on acoustic cavitation and hence on the mechanism of sonochemistry. The work will be valuable to many researchers in allowing them to optimize reaction and process conditions in sonochemical systems.