Bijma K, Rank E, Engberts JBFN
Department of Organic and Molecular Inorganic Chemistry, University of Groningen, Nijenborgh 4, Groningen, 9747 AG, The Netherlands
J Colloid Interface Sci. 1998 Sep 15;205(2):245-256. doi: 10.1006/jcis.1998.5687.
This paper describes the influence of counterions on the unidirectional growth of micelles formed by alkylpyridinium surfactants in aqueous solution. It is shown that the growth of spherical micelles to form wormlike micelles is strongly dependent on counterion structure. More hydrophobic counterions induce the formation of wormlike micelles at lower surfactant concentrations. Next to hydrophobicity and the type of substituent, the substitution pattern of the aromatic ring plays the most important role in micellar growth. The formation of a network of entangled, elongated wormlike micelles by alkylpyridinium surfactants with o-hydroxybenzoate and p-chlorobenzoate counterions is discussed in terms of surfactant structure. It is concluded that, next to counterion structure, the microenvironment of the counterion (substituent) in the Stern region and the structure of the surfactant monomer (i.e., the surfactant cation) play the most important role in the formation of these elongated wormlike micelles. Headgroup effects are proposed to be the main driving force for this phenomenon. Copyright 1998 Academic Press.
本文描述了抗衡离子对烷基吡啶鎓表面活性剂在水溶液中形成的胶束单向生长的影响。结果表明，球形胶束生长形成蠕虫状胶束强烈依赖于抗衡离子结构。疏水性更强的抗衡离子在较低表面活性剂浓度下就能诱导蠕虫状胶束的形成。除了疏水性和取代基类型外，芳环的取代模式在胶束生长中起最重要的作用。本文根据表面活性剂结构，讨论了带有邻羟基苯甲酸盐和对氯苯甲酸盐抗衡离子的烷基吡啶鎓表面活性剂形成缠结的细长蠕虫状胶束网络的过程。得出的结论是，除了抗衡离子结构外，斯特恩区域中抗衡离子（取代基）的微环境和表面活性剂单体（即表面活性剂阳离子）的结构在这些细长蠕虫状胶束的形成中起最重要的作用。头基效应被认为是这一现象的主要驱动力。版权所有1998年学术出版社。
