Ultrasonic relaxation study of the exchange process of surfactant monomer with micelle in aqueous solutions of alkyltrimethylammonium bromides
Ultrasonic relaxation study of the exchange process of surfactant monomer with micelle in aqueous solutions of alkyltrimethylammonium bromides
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烷基三甲基溴化铵水溶液中表面活性剂单体与胶束交换过程的超声弛豫研究
DOI：
10.1021/j100319a041
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
S. Ikeda
中科院分区：
文献类型：
--
作者：
S. Kato;H. Nomura;H. Honda;R. Zieliński;S. Ikeda
结论核磁共振结果支持先前的解释的邻苯甲酰氧基部分在n-（9-邻苯甲酰氧基）硬脂酸探针远离胶束-水界面的C12 E8，CTAC，STS，和SHS表面活性剂组件。然而，渐变不是特别明显，胶束核心的外部亚甲基周围的区域仍然具有明显的偏差。对于SDS和在较小程度上STS，胶束生长发生在探针的存在下。基于NMR化学位移，蒽氧基的位置似乎在较大的未定义聚集体的-（CH 2）n-基团周围，其流动性低于未扰动的胶束。DF承认国家研究奖学金计划授予的研究奖学金。这项工作得到了澳大利亚研究赠款计划的部分支持。
ConclusionsThe NMR results support the previous interpretation of gradation of the anthroyloxy moiety in n-(9-anthroyloxy) stearic acid probes away from the micelle-water interface for C12E8, CTAC, STS, and SHS surfactant assemblies. The gradation is however not particularly pronounced, with a distinct bias still for the region around the outer methylene groups of the micelle core. For SDS and to a lesser extent STS, micelle growth occurs in the presence of the probe. The location of the anthroyloxy group, based on NMR chemical shifts, appears tobe around the-(CH2)„-groups of the larger undefined aggregates, which possess a lower fluidity than the unperturbed micelles.Acknowledgment. DF acknowledges the award of a Research Fellowship from the National Research Fellowship Scheme. This work was supported in part by the Australian Research Grants Scheme.