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为了深入了解阳离子表面活性剂溶液在复杂体系中的物理化学性质,以十六烷基三甲基氯化铵(CTAC)和十六烷基三甲基溴化铵(CTAB)为模型,通过电导法和表面张力法研究其在水相体系中的聚集行为。测定两种表面活性剂的临界胶束浓度CMC、胶束离解度β、胶束聚集数n和表面过剩吸附量Γs。由CMC与温度T的关系,应用准相分离模型计算了胶束化热力学参数ΔmicG0、ΔmicH0和ΔmicS0,结果表明ΔmicG0为负值,而且随温度变化很小,ΔmicH0的值相对于TΔmicS0来说小得多,表明胶束化过程为熵驱动过程。
In order to understand the physicochemical properties of cationic surfactant solution in complex systems, cetyltrimethylammonium chloride (CTAC) and cetyltrimethylammonium bromide (CTAB) were modeled by conductivity Method and surface tension method to study its aggregation behavior in aqueous system. The critical micelle concentration (CMC), micellar dissociation (β), micellar aggregation number (n) and superficial adsorption capacity (Γs) of the two surfactants were determined. From the relationship between CMC and temperature T, the parameters of micellarization, ΔmicG0, ΔmicH0 and ΔmicS0, were calculated by the quasi-phase separation model. The results showed that ΔmicG0 was negative and the change with temperature was small. The value of ΔmicH0 was small relative to TΔmicS0 More, indicating that the process of micellar entropy-driven process.