Matsuoka Keisuke, Takeuchi Emi, Takahashi Megumi, Kitsugi Satomi, Honda Chikako, Endo Kazutoyo
Department of Physical Chemistry, Showa Pharmaceutical University, Higashi-Tamagawagakuen 3-3165, Machida, Tokyo 194-8543, Japan.
J Colloid Interface Sci. 2009 May 15;333(2):641-5. doi: 10.1016/j.jcis.2009.02.009. Epub 2009 Feb 11.
The maximum solubilities of homologous series of n-alkylbenzene and n-perfluoroalkylbenzene in aqueous solutions of surfactants n-tetradecyltrimethylammonium chloride (TTAC) and N-(1,1-dihydroperfluorodecyl)-N,N,N-trimethylammonium chloride (C10F-TAC) were measured as a function of the surfactant concentration at 298.2 K. There are four solubilization systems in viewpoints of hydrocarbons and fluorocarbons. In general, in all systems, the maximum solubility decreased with an increase in the alkyl carbon length of the solubilizates. The homogeneous combinations of solubilizates and solubilizers have higher affinity than heterogeneous combinations. The affinity between a hydrocarbon and a fluorocarbon can be clarified by determining the Gibbs free energy (DeltaG(0)) on solubilization by thermodynamic analysis. The largest negative value of DeltaG(0) was obtained for the homogeneous system of n-perfluoroalkylbenzene and C10F-TAC, whereas the smallest value was obtained for the heterogeneous system of n-perfluoroalkylbenzene and TTAC. The contributions of methylene and perfluoromethylene to Gibbs energy, namely, DeltaG(CH(2)0)) and DeltaG(CF(2)(0)), were found to be -2.6 and -2.9 kJ mol(-1), respectively, for the TTAC solution, whereas the respective values for the C10F-TAC solution were -2.0 and -3.3 kJ mol(-1).
在298.2 K下，测定了正烷基苯和正全氟烷基苯同系物在表面活性剂十四烷基三甲基氯化铵（TTAC）和N-(1,1-二氢全氟癸基)-N,N,N-三甲基氯化铵（C10F-TAC）水溶液中的最大溶解度，并将其作为表面活性剂浓度的函数。从碳氢化合物和碳氟化合物的角度来看，有四种增溶体系。一般来说，在所有体系中，最大溶解度都随着被增溶物烷基碳链长度的增加而降低。被增溶物和增溶剂的均相组合比非均相组合具有更高的亲和力。通过热力学分析确定增溶过程中的吉布斯自由能（ΔG(0)），可以阐明碳氢化合物和碳氟化合物之间的亲和力。对于正全氟烷基苯和C10F-TAC的均相体系，获得了最大的负ΔG(0)值，而对于正全氟烷基苯和TTAC的非均相体系，获得了最小的值。对于TTAC溶液，发现亚甲基和全氟亚甲基对吉布斯能的贡献，即ΔG(CH(2)0))和ΔG(CF(2)(0))，分别为-2.6和-2.9 kJ mol(-1)，而对于C10F-TAC溶液，相应的值分别为-2.0和-3.3 kJ mol(-1)。
