Abstract

The present work describes the effect of 1-nonyl-3-methylimidazolium bromide [C₉mim][Br] and 1-dodecyl-3-methylimidazolium bromide [C₁₂mim][Br] on aggregation behavior of anionic surfactant dioctyl sodium sulfosuccinate (NaAOT) in aqueous medium by employing different techniques such as conductivity measurement, UV–Visible spectroscopy and FT-IR spectroscopy. The conductivity data of anionic surfactant in the aqueous solution of surface-active ionic liquids is taken experimentally in the temperature range from 293.15 to 308.15 K with the interval of 5 K at various concentrations that is, (0.04, 0.08, 0.12, and 0.16) wt.% of both the SAILs. The critical micelle concentration (CMC) of NaAOT is detected to alter in the presence of both the SAILs. Temperature dependence of CMC obtained from conductivity measurements is utilized to evaluate various thermodynamic parameters of micellization such as, standard free energy of micellization ($\mathrm{\Delta }{G}_m^0$), standard enthalpy of micellization ($\mathrm{\Delta }{H}_m^0$), and standard entropy of micellization ($\mathrm{\Delta }{S}_m^0$). The UV–Visible spectroscopic study is utilized to confirm CMC values obtained from conductivity measurements, which are found to be in good agreement. FT-IR Spectra are recorded to analyze the structural changes that prevailed in both systems.

摘要

目前的工作描述了 1-nonyl-3-methylimidazolium bromide [C ₉ mim][Br] 和 1-dodecyl-3-methylimidazolium bromide [C ₁₂mim][Br] 对阴离子表面活性剂二辛基磺基琥珀酸钠 (NaAOT) 在水性介质中的聚集行为的影响，采用电导率测量、紫外-可见光谱和 FT-IR 光谱等不同技术。阴离子表面活性剂在表面活性离子液体水溶液中的电导率数据是在293.15~308.15 K的温度范围内以5 K为间隔在不同浓度（0.04、0.08、0.12和0.16）下实验得到的两个 SAIL 的 wt.%。检测到 NaAOT 的临界胶束浓度 (CMC) 在两种 SAIL 存在的情况下都会发生变化。从电导率测量获得的 CMC 的温度依赖性用于评估胶束化的各种热力学参数，例如胶束化的标准自由能（$\mathrm{△}{G}_{米}^0$), 标准胶束化焓 ($\mathrm{△}{H}_{米}^0$), 和胶束化的标准熵 ($\mathrm{△}{\mathrm{小号}}_{米}^0$). 紫外-可见光谱研究用于确认从电导率测量中获得的 CMC 值，发现它们非常吻合。记录 FT-IR 光谱以分析两个系统中普遍存在的结构变化。