Rodríguez Amalia, Muñoz María, Graciani María Del Mar, Moyá María Luisa
Departamento de Química Física, Universidad de Sevilla, C/Profesor García González 2, 41012 Sevilla, Spain.
J Colloid Interface Sci. 2006 Jun 15;298(2):942-51. doi: 10.1016/j.jcis.2006.01.038. Epub 2006 Feb 14.
The influence of the addition of various amounts of ethylene glycol, EG, up to a weight percent of 50%, on the micellization process in N-hexadecyl, N-tetradecyl, and N-dodecyltrimethylammonium chloride micellar solutions was investigated. Conductivity, fluorescence, and spectroscopic measurements give information about changes in the cmc, in the micellar ionization degree, in the aggregation number and in the polarity of the interfacial region upon changing the percentage by weight of the organic solvent. These changes were compared to those found when ethylene glycol was added to the analogous alkyltrimethylammonium bromide aqueous micellar solutions, results showing that the effects caused by the presence of the organic solvent were practically independent of the counterion nature. This conclusion was in agreement with the micellar kinetic effects observed on the spontaneous hydrolysis of phenyl chloroformate in both water-ethylene glycol alkyltrimethylammonium bromide and chloride micellar solutions.
研究了添加高达50%（重量百分比）的各种量的乙二醇（EG）对正十六烷基、正十四烷基和正十二烷基三甲基氯化铵胶束溶液中胶束化过程的影响。电导率、荧光和光谱测量提供了关于在改变有机溶剂重量百分比时，临界胶束浓度（cmc）、胶束电离度、聚集数和界面区域极性变化的信息。将这些变化与向类似的烷基三甲基溴化铵水胶束溶液中添加乙二醇时发现的变化进行了比较，结果表明有机溶剂的存在所引起的影响实际上与抗衡离子的性质无关。这一结论与在水-乙二醇烷基三甲基溴化铵和氯化物胶束溶液中观察到的苯基氯甲酸酯自发水解的胶束动力学效应一致。
