Fluorescence delineation of the surfactant microstructures in the CTAB-sOS-H2O catanionic system.
Fluorescence delineation of the surfactant microstructures in the CTAB-sOS-H2O catanionic system.
复制标题
CTAB-sOS-H2O 阴离子系统中表面活性剂微观结构的荧光描绘。
DOI：
10.1021/la0351764
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
Goto,KimberlyF
中科院分区：
文献类型：
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作者：
Karukstis,KerryK;McCormack,ShelleyA;McQueen,TyrelM;Goto,KimberlyF
两亲性分子的一个关键特征是它们能够进行自组装，在这个过程中，复杂的层次结构是在没有外部干预的情况下建立的。由阳离子和阴离子表面活性剂水溶液组成的三元体系表现出丰富的自组装微结构，如球形和棒状胶束、单层和多层小泡、平面双层和双连续结构。通常，需要多种互补技术来探索相反电荷表面活性剂水体系的相行为和形态。作为一种新颖而有效的替代方法，我们使用荧光光谱测量来研究稀相表面活性剂区域内的阳离子/阴离子表面活性剂水溶液体系的微观结构。特别是，我们证明了极性敏感的荧光基团普罗丹可以用来标定十六烷基三甲基溴化铵、辛基硫酸钠和水三元体系的表面活性微观结构。由于该探针的荧光特征取决于存在的表面活性剂聚集体的性质，因此我们的方法是一种有效绘制复杂表面活性剂相图的新方法。
A key feature of amphiphilic molecules is their ability to undergo self-assembly, a process in which a complex hierarchical structure is established without external intervention. Ternary systems consisting of aqueous mixtures of cationic and anionic surfactants exhibit a rich array of self-assembled microstructures such as spherical and rodlike micelles, unilamellar and multilamellar vesicles, planar bilayers, and bicontinuous structures. In general, multiple complementary techniques are required to explore the phase behavior and morphology of aqueous systems of oppositely charged surfactants. As a novel and effective alternative approach, we use fluorescence spectroscopic measurements to examine the microstructures of aqueous cationic/anionic surfactant systems in the dilute surfactant region. In particular, we demonstrate that the polarity-sensitive fluorophore prodan can be used to demarcate the surfactant microstructures of the ternary system of cetyltrimethylammonium bromide, sodium octyl sulfate, and water. As the fluorescence signature of this probe is dependent on the nature of the surfactant aggregates present, our method is a promising new approach to effectively map complex surfactant phase diagrams.