...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Ultrasonics sonochemistry >Sonoelectrochemical and sonochemical effects of cavitation: correlation with interfacial cavitation induced by 20 kHz ultrasound
【24h】

Sonoelectrochemical and sonochemical effects of cavitation: correlation with interfacial cavitation induced by 20 kHz ultrasound

机译：空化的声电化学和声化学效应：与20 kHz超声诱导的界面空化的关系

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Sonoelectrochemical measurements at macro-electrodes under extreme conditions with a very short distance between ultrasonic horn tip and electrode and different ultrasound intensity levels are shown to result in violent cavitation detected in form of current peaks superimposed on the average limiting current. Analysis of the current data obtained for the oxidation of ferrocene in dimethylformamide (0.1 M NBu{sub}4PF{sub}6) at a 4 mm diameter Pt disc electrode and for the reduction of (Ru(NH{sub}3) {sub}6) {sup}(3+) in aqueous 0.1 M KCl at a 6 mm diameter Pt disc electrode consistently indicate a change of the physicochemical nature of sonoelectrochemical processes under extreme conditions. The sonoelectrochemical measurement of the rate constant for the carbon bromide bond cleavage of a 3-bromobenzophenone radical anion electrogenerated at a glassy carbon electrode in dimethylformamide solution in the presence of power ultrasound is shown to yield evidence for a breakdown of the conventional mass transport model of a planar diffusion layer under extreme conditions. The change can be correlated to the number of current data points deviating more than 10% from the mean of the current due to violent cavitation processes superimposed onto the average limiting current. Further, a study of the sonochemical destruction of aqueous dilute cyanide solution (in 0.1 M NaOH) demonstrates a correlation between the electrochemic41y detected cavitation violence and the sonochemical activity. Factors that govern the violence of interfacial cavitation appear to be directly proportional to the factors that make cavitation in the bulk solution chemically efficient.
机译：结果表明，在极端条件下，超声角尖与电极之间的距离非常短且超声强度水平不同时，在宏电极上进行的声电化学测量结果会导致检测到剧烈的空化现象，其形式是叠加在平均极限电流上的电流峰值。对在直径为4 mm的Pt圆盘电极上二甲基甲酰胺（0.1 M NBu {sub} 4PF {sub} 6）中的二茂铁进行氧化以及还原（Ru（NH {sub} 3）{sub } 6）在直径为6 mm的Pt圆盘电极上的0.1 M KCl水溶液中的{sup}（3+）始终表明在极端条件下声电化学过程的物理化学性质发生了变化。超声电化学法测量了在功率超声存在下在二甲基甲酰胺溶液中在玻碳电极上玻碳电极上电生成的3-溴二苯甲酮自由基阴离子的碳溴键断裂速率常数的声电化学方法，为常规传质模型的分解提供了证据。极端条件下的平面扩散层。该变化可以与电流数据点的数量相关，该数据点由于叠加在平均极限电流上的剧烈空化过程而与电流平均值相差超过10％。此外，对稀氰化物水溶液（在0.1 M NaOH中）的声化学破坏的研究表明，电化学检测到的空化暴力与声化学活性之间存在相关性。控制界面空化作用暴力的因素似乎与使整体溶液中的空化作用具有化学有效性的因素成正比。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号