A comparative sonochemical reaction that is independent of the intensity of ultrasound and the geometry of the exposure apparatus.
A comparative sonochemical reaction that is independent of the intensity of ultrasound and the geometry of the exposure apparatus.
复制标题
一种独立于超声波强度和曝光设备几何形状的比较声化学反应。
DOI：
10.1016/j.ultsonch.2008.03.007
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发表时间：
2008
影响因子：
8.4
通讯作者：
Sostaric,JoeZ
中科院分区：
文献类型：
--
作者：
Sostaric,JoeZ
正烷基阴离子表面活性剂水溶液的超声分解导致形成二级碳中心自由基（-CH-）。-CH-的产率取决于本体表面活性剂浓度，直到达到最大可达到的自由基产率（“平台产率”），其中增加的表面活性剂浓度（低于临界胶束浓度）不再影响-CH-产率。在早期的研究中，发现在平台浓度下，在戊烷磺酸钠（SPSo）的水溶液与十二烷基硫酸钠（SDS）的水溶液的超声分解之后检测到的-CH-的比率（即CHSPSo/CHSDS）取决于超声分解的频率，但与超声强度无关[J.Z. Sostaric，P. Riesz，在空化气泡的气体/溶液界面处表面活性剂的吸附：声化学中的超声强度独立频率效应，J. Phys. Chem. B 106（2002）12537-12548]。在当前的研究中，发现CHSP 50/CHSDS比仅取决于超声频率，而不取决于所考虑的超声暴露装置的几何形状。
Sonolysis of aqueous solutions of n-alkyl anionic surfactants results in the formation of secondary carbon-centered radicals (–CH–). The yield of –CH– depends on the bulk surfactant concentration up to a maximum attainable radical yield (the ‘plateau yield’) where an increasing surfactant concentration (below the critical micelle concentration) no longer affects the –CH– yield. In an earlier study it was found that the ratio of –CH– detected following sonolysis of aqueous solutions of sodium pentane sulfonate (SPSo) to that of sodium dodecyl sulfate (SDS) (i.e. CHSPSo/CHSDS) depended on the frequency of sonolysis, but was independent of the ultrasound intensity, at the plateau concentrations [J.Z. Sostaric, P. Riesz, Adsorption of surfactants at the gas/solution interface of cavitation bubbles: an ultrasound intensity-independent frequency effect in sonochemistry, J. Phys. Chem. B 106 (2002) 12537–12548]. In the current study, it was found that the CHSPSo/CHSDSratio depended only on the ultrasound frequency and did not depend on the geometry of the ultrasound exposure apparatus considered.