A 1 kHz resolution frequency study of a variety of sonochemical processes
A 1 kHz resolution frequency study of a variety of sonochemical processes
复制标题
各种声化学过程的 1 kHz 分辨率频率研究
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
T. Leighton
中科院分区：
文献类型：
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作者：
P. Birkin;J. Power;Aurore M. L. Vinçotte;T. Leighton
已知通过声化学效应增强或驱动的各种反应已经被研究，并且它们的绝对速率被测量为圆柱形反应器内使用的超声波频率的函数。显示该速率高度依赖于 20 kHz 至 160 kHz 范围内使用的超声波频率。系统的频率依赖性是换能器、混响声场、空化动力学和化学的频率依赖性的最终结果。所研究反应的速率变化与光发射（声致发光）相关，作为声驱动频率的函数，分辨率低至 1 kHz。参考所使用的单元的声学特性（特别是模态性质）来讨论结果。将结果与细胞内的空间峰值声压振幅和宽带音频发射进行比较。化学活动可以通过声致发光活动来预测，声致发光活动与较高频率下产生的更空间复杂的声场相关。最重要的发现是，声场的表征在声化学实验中至关重要：由于模态声场的调谐效应，驱动频率的 <3% 变化会使化学活性改变 3 个数量级。
A variety of reactions, which are known to be enhanced or driven by sonochemical effects, have been studied and their absolute rate measured as a function of the ultrasonic frequency employed within a cylindrical reactor. The rate is shown to be highly dependent on the ultrasonic frequency employed in the range of 20 kHz to 160 kHz. The frequency dependence of the system is the net result of the frequency dependencies of the transducer, the reverberant sound field, the cavitation dynamics and the chemistry. Rate variation of the reactions studied is correlated to light emission (sonoluminescence) as a function of the acoustic driving frequency with a resolution down to 1 kHz. The results are discussed with reference to the acoustic characteristics (particularly the modal nature) of the cell employed. The results are compared to the spatial peak acoustic pressure amplitude within the cell and broadband audio emission. Chemical activity could be predicted by sonoluminescence activity, which correlated with the more spatially complex sound field produced at higher frequencies. The most important finding is that characterisation of the sound field is vital in sonochemical experiments: a <3% change in the driving frequency was found to change the chemical activity by 3 orders of magnitude, because of the tuning effect of the modal sound field.
影响因子：
2.9
作者：
APFEL, RE;HOLLAND, CK
通讯作者：
HOLLAND, CK