Micellar solubilization in aqueous binary surfactant systems: Barbituric acids in mixed anionic + nonionic or cationic + nonionic mixtures
Micellar solubilization in aqueous binary surfactant systems: Barbituric acids in mixed anionic + nonionic or cationic + nonionic mixtures
复制标题
水性二元表面活性剂体系中的胶束增溶：混合阴离子非离子或阳离子非离子混合物中的巴比妥酸
DOI：
10.1016/0021-9797(88)90074-4
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发表时间：
1988
影响因子：
9.9
通讯作者：
F. Puisieux
中科院分区：
文献类型：
--
作者：
C. Treiner;M. Nortz;C. Vaution;F. Puisieux
在十二烷基硫酸钠(SDS)+十二烷基聚氧乙烯(POE)和十四烷基三甲基溴化铵(TTAB)+POE两种二元表面活性剂体系的全组成范围内，测定了四种巴比妥酸的胶束增溶作用。此外，还研究了体系(I)在0.2摩尔氯化钠存在下的溶解度。讨论了混合表面活性剂体系中增溶实验的特殊性.结果表明，巴比妥酸在胶束和水之间的分配系数P随胶束组成的变化可以用一个类似于专用于三组分溶液的规则溶液近似推导的关系来表示，即只有一个经验系数.对于所研究的所有系统，该参数均为负值。它与体系(I)的溶质有关，但与体系(II)无关。通过与常规溶液方法的比较，得出结论：胶束中不同表面活性剂之间的相互作用决定了拟合参数的符号和幅度，从而决定了P随表面活性剂组成的变化。结果表明，在大多数情况下，在混合表面活性剂体系中，极性疏水分子的P值应小于按理想加和性原理计算的P值。
The micellar solubilization of four barbituric acids, namely reposal, pentobarbital, butobarbital, and barbital, has been determined in the whole composition range of two binary surfactant systems: (I) sodium dodecylsulfate (SDS) + dodecylpolyoxyethylene 23 (POE) and (II) tetradecyltrimethylammonium bromide (TTAB) + POE. Reposal solubility was also studied in system (I) in presence of 0.2 molal NaCl. The specificities of solubilization experiments in mixed surfactant systems are discussed.It is shown that the variation of the barbituric acids' partition coefficientsPbetween micelle and water as a function of micellar composition may be adequately represented by a relationship similar to that deduced from the regular solution approximation specialized for a three-component solution, i.e., with a single empirical coefficient. This parameter is negative for all systems studied. It is solute dependent for system (I) but not for system (II). From a comparison with the regular solution approach, it is concluded that the interaction between unlike surfactants in the micelles governs the sign and amplitude of the fitting parameter and therefore the variation ofPwith surfactant composition. As a consequence it is indicated that in most cases, thePvalues of polar hydrophobic molecules should be less in mixed surfactant systems than that calculated from the ideal additivity principle.