• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International journal of environmental analytical chemistry >Flow-injection chemiluminescence method for determination of critical micelle concentration of surfactants
【24h】

Flow-injection chemiluminescence method for determination of critical micelle concentration of surfactants

机译：流动注射化学发光法测定表面活性剂的临界胶束浓度

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

In this study, chemiluminescence (CL) behaviour of Luminol-H2O2 in the presence of the different concentrations of four surfactants, cetyltrimethylammonium bromide (CTAB), cetylpyridinium bromide (CPB), sodium dodecyl sulphate (SDS) and polyoxyethylene dodecyl ether (Brij-35), was investigated. A novel method for the direct determination of critical micelle concentration (CMC) of the surfactants using flow-injection CL is described. Under the optimum conditions, the luminescence intensity of the Luminol-H2O2 system increased gradually with increasing concentration of the surfactants before the CMC, but rapidly reached to the emission maximum at the CMC, followed by a decrease after the CMC. The concentrations of the surfactants corresponding to the luminescence maximum are in agreement with the literature CMC values. The main factors affecting the determination of CMC are discussed. The mechanistic studies show that the luminescence peaks observed in the experiment were mainly because of the protective effect of the micelle against the transition of the excited species and the retarding effect of the micelle structures on the CL reaction rate.
机译：在这项研究中，Luminol-H2O2在不同浓度的四种表面活性剂，十六烷基三甲基溴化铵（CTAB），十六烷基溴化吡啶鎓（CPB），十二烷基硫酸钠（SDS）和聚氧乙烯十二烷基醚（Brij-35）存在下的化学发光（CL）行为），进行了调查。描述了一种使用流动注射CL直接测定表面活性剂的临界胶束浓度（CMC）的新方法。在最佳条件下，Luminol-H2O2系统的发光强度在CMC之前随表面活性剂浓度的增加而逐渐增加，但在CMC处迅速达到最大发射，随后在CMC之后降低。对应于发光最大值的表面活性剂的浓度与文献CMC值一致。讨论了影响CMC测定的主要因素。机理研究表明，在实验中观察到的发光峰主要是由于胶束对激发物种的转变的保护作用和胶束结构对CL反应速率的阻滞作用。

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