ON IONIC STRENGTH DEPENDENCE OF MICELLE NUMBER .2.
ON IONIC STRENGTH DEPENDENCE OF MICELLE NUMBER .2.
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DOI：
10.1021/j100865a057
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发表时间：
1967-01-01
影响因子：
--
通讯作者：
HOLTZER, A
中科院分区：
文献类型：
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作者：
EMERSON, MF;HOLTZER, A
去水剂溶液最显著的特征之一是存在临界胶束浓度（cmc）。此外，由于cmc是一种易于测量的特性，许多努力都是为了清楚地了解它的物理意义。在较早的一篇论文中，已经证明了RT In （cmc）等于在胶束中再加入一个洗涤剂单体的标准自由能变化（AG”jv），该胶束已经包含了最有可能在cmc （Ñ）上的单体数量。这一结果不依赖于相分离的假设，也不需要对胶束溶液进行详细的统计力学分析。然而，这样的分析与这个结论是一致的。所讨论的标准自由能变化在概念上可分为碳氢化合物贡献和静电贡献。后者可以用胶束表面静电势的大小（\f/b）来表示。因此
One of the most striking features of solutions of de-tergents in water is the existence of a critical micelle concentration (cmc). Since, furthermore, the cmc is a readily measurable property, many efforts have been directed toward obtaining a clear understanding of its physical significance. In an earlier paper1 23 it was shown that the quantity RT In (cmc) is equal to the standard free energy change (AG" jv) for the addition of one more detergent monomer to a micelle which already contains that number of monomers most probable at the cmc (Ñ). This result is independent of assumptions about phase separation and does not require, for its deriva-tion, a detailed statistical-mechanical analysis of micellar solutions. Such an analysis is, however, con-sistent with this conclusion. 4 The standard free energy change in question can be divided, conceptually, into a hydrocarbon contribution and an electrostatic contribution. The latter can be expressed in terms of the magnitude of the electrostatic potential at the micellar surface (\f/b). Thus