A chemical sensor that can detect the frequency of ultrasound.
A chemical sensor that can detect the frequency of ultrasound.
复制标题
一种可以检测超声波频率的化学传感器。
DOI：
10.1021/ja077311v
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发表时间：
2008
影响因子：
15
通讯作者：
Sostaric,JoeZ
中科院分区：
文献类型：
--
作者：
Sostaric,JoeZ
本文描述了一种可以检测超声波频率的化学传感器。将烷基硫酸盐或磺酸盐表面活性剂水溶液暴露于高强度超声导致形成二次碳中心自由基。这些自由基的产率达到最大平台，其幅度是有限的动态能力的表面活性剂积累在快速振荡的气体/溶液界面的空化气泡。由于这个原因，与十二烷基硫酸钠溶液相比，在丁烷磺酸钠溶液的超声分解之后观察到的最大平台产率（即，CHSB 50/CHSDS）大于1。有趣的是，发现CHSB 50/CHSDS比对超声频率具有线性依赖性。由于从早期研究中已知CHSB 50/CHSDS比与超声强度和平板暴露系统的几何形状无关，因此CHSB 50/CHSDS比对超声频率的曲线图产生校准曲线。利用该校准曲线，CHSB 50/CHSDS比率可用于检测平板换能器系统中的超声频率。该效果可以最好地描述在表面活性剂的动态表面张力方面的超声频率的影响声化学活性空化气泡的气体/溶液界面的寿命。
Herein is described a chemical sensor that can detect the frequency of ultrasound. Exposure of aqueousn-alkyl sulfate or sulfonate surfactant solutions to high-intensity ultrasound results in the formation of secondary carbon-centered radicals. The yield of these radicals reaches a maximum plateau, the magnitude of which is limited by the dynamic ability of the surfactant to accumulate at the rapidly oscillating gas/solution interface of cavitation bubbles. For this reason, the maximum plateau yield observed following sonolysis of sodium butane sulfonate solutions compared to that of sodium dodecyl sulfate solutions (i.e., CHSBSo/CHSDS) was greater than 1. Interestingly, it was found that the CHSBSo/CHSDSratio had a linear dependence on ultrasound frequency. Since it is known from earlier studies that the CHSBSo/CHSDSratio is independent of ultrasound intensity and of the geometry of flat plate exposure systems, a plot of the CHSBSo/CHSDSratio against ultrasound frequency yields a calibration curve. With this calibration curve, the CHSBSo/CHSDSratio can be used to detect the frequency of ultrasound in flat plate transducer systems. The effect can best be described in terms of the dynamic surface tension of surfactants in relation to the influence of ultrasound frequency on the lifetime of the gas/solution interface of sonochemically active cavitation bubbles.