Department of Chemistry, Vidyasagar University.
Department of Chemistry, National Institute of Technology Manipur.
J Oleo Sci. 2021 Feb 1;70(2):185-194. doi: 10.5650/jos.ess20303. Epub 2021 Jan 15.
Aggregation studies of anionic surfactant sodium dodecyl sulphate (SDS) was investigated in aqueous 1-butyl-3-methylimidazolium chloride [bmim]Cl and N-butyl-N-methyl pyrrolidinium tetrafluoroborate [bmp]BF ionic liquid (IL) solutions respectively. Systems were studied by surface tension, conductance, UV-VIS absorption/emission spectroscopy and dynamic light scattering. Critical micelle concentration (CMC) values gradually decreased with increasing IL concentration which indicates synergistic interaction between ILs and SDS. Gibbs free energy change results demonstrated spontaneous micellization induced by ILs; however the effect of ILs were not similar to the corresponding regular salts (NaCl and NaBF). Aggregation number (n) of micelles, determined by fluorescence quenching method, indicate that the 'n' values increase with increasing ILs concentration, induced by the oppositely charged IL cation. Size of the micelles, determined by dynamic light scattering studies, increased with increasing ILs concentration, which were due to the formation of larger aggregates; the aggregates are considered to be comprised of the anionic surfactant with a substantial proportion of ILs cation as the bound counter ions. Such studies are considered to shed further light in the fundamentals of IL induced micellization as well as in different practical applications.
分别在水相 1-丁基-3-甲基咪唑氯([bmim]Cl)和 N-丁基-N-甲基吡咯烷四氟硼酸盐([bmp]BF)离子液体 (IL) 溶液中研究了阴离子表面活性剂十二烷基硫酸钠 (SDS) 的聚集研究。通过表面张力、电导率、紫外-可见吸收/发射光谱和动态光散射研究了这些体系。随着 IL 浓度的增加，临界胶束浓度 (CMC) 值逐渐降低，表明 IL 与 SDS 之间存在协同相互作用。吉布斯自由能变化结果表明 IL 诱导自发胶束化；然而，IL 的作用与相应的常规盐（NaCl 和 NaBF）不同。通过荧光猝灭法测定的胶束聚集数 (n) 表明，随着 IL 浓度的增加，“n”值增加，这是由带相反电荷的 IL 阳离子引起的。通过动态光散射研究确定的胶束尺寸随着 IL 浓度的增加而增加，这是由于形成了更大的聚集体；这些聚集体被认为由阴离子表面活性剂和相当一部分 IL 阳离子组成，作为结合的抗衡离子。这些研究被认为进一步阐明了 IL 诱导胶束化的基本原理以及不同的实际应用。
