COUNTERION BINDING ON MIXED MICELLES
COUNTERION BINDING ON MIXED MICELLES
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DOI：
10.1021/j150668a014
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发表时间：
1984-01-01
影响因子：
--
通讯作者：
SCAMEHORN, JF
中科院分区：
文献类型：
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作者：
RATHMAN, JF;SCAMEHORN, JF
部分反离子结合测定胶束组成的混合物的阴离子/非离子，阳离子/非离子，阴离子/阴离子，阳离子/阳离子表面活性剂。使用的表面活性剂是癸基硫酸钠、癸基磺酸钠、氯化十六烷基吡啶、氯化十六烷基三甲基铵和壬基酚聚（乙氧基化物）。对于离子/非离子混合胶束，随着胶束的非离子表面活性剂含量的增加，部分反离子结合在纯离子胶束的值和零之间单调变化。在离子型胶束中，结合力随组成的变化在纯离子型胶束的值之间单调变化。建立了局域吸附模型和移动的吸附模型。这两种模型都是基于静电的考虑，都很好地描述了结合数据。从物理角度来看，局部吸附模型是首选的，特别是对于主要由非离子表面活性剂组成的离子/非离子混合胶束。这些结果表明，静电的考虑是主要原因的热力学nonidealityof离子/非离子混合胶束。混合离子/非离子胶束上的反离子结合随温度变化很小，这是由单一离子表面活性剂组成的胶束的共同特征。
Fractional counterion bindings were measured on micelles composed of mixtures of anionic/nonionic, cationic/nonionic, anionic/anionic, and cationic/cationic surfactants. Surfactants used were sodium decyl sulfate, sodium decyl sulfonate, hexadecylpyridinium chloride, hexadecyltrimethylammonium chloride, and a nonylphenol poly (ethoxylate). For ionic/nonionic mixed micelles, the fractional counterion binding varies monotonically between the value for the pure ionic micelle and zero, as the nonionic surfactant content of the micelle increases. Forionic/ionic mixedmicelles, the binding varies monotonically between the values of the pure ionic micelles as composition varies. A localized adsorption model and a mobile adsorption model were developed to describe the binding. Both models were based on electrostatic considerations and both described the binding data very well. On physical grounds, the localized adsorption model is preferred, particularly for ionic/nonionic mixed micelles composed mainlyof nonionic surfactant. These results indicate that electrostatic considerations are the dominant cause of the thermodynamic nonidealityof the ionic/nonionic mixed micelle. Counterion bindings on mixed ionic/nonionic micelles vary little withtemperature, a feature in common with micelles composed of a single ionic surfactant.