Variation of micellization, thermodynamic, and surface properties of sodium dodecyl sulfate in aqueous media using 1,3-disulfo-2-alkyl imidazolium chloride ionic liquids

IF 2.2 4区化学 Q3 CHEMISTRY, PHYSICAL

Colloid and Polymer Science Pub Date : 2024-03-23 DOI:10.1007/s00396-024-05247-w

Debanga Bhusan Bora, Bhaskar Ranjan Bora, Subham Paul, Sangeeta Kalita, Niharika Kashyap, Ruli Borah

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Abstract

Three direct –NSO₃H functionalized Brønsted acidic ionic liquids of 2-alkyl-1,3-disulfo imidazolium chloride with varied sizes of alkyl substituents (Me-, Et-, nBu-) were utilized to explore the effects of ionic liquids on aggregation behavior of anionic surfactant sodium dodecyl sulfate in aqueous media at various concentrations of ionic liquids and temperatures (288.15 K, 293.15 K, 298.15 K, 303.15 K, and 308.15 K). Critical micelle concentrations (CMCs) of the IL-surfactant systems obtained from conductivity measurement were found to be in good agreement with the CMC values of surface tension and UV–visible spectroscopy techniques. These CMCs values were used to calculate the thermodynamic parameters of IL-surfactant solutions such as standard free energy of micellization (ΔG°_m), standard enthalpy of micellization (ΔH°_m), and standard entropy of micellization (ΔS°_m). Continuous decrease of the CMC values was observed with increasing concentrations of the ILs as well as temperatures. Packing parameters calculated from the surface tension measurement displayed small spherical shape for all the mixed micellar systems. Structural changes of the IL-surfactant solutions were also observed using FT-IR spectroscopic method. Increased positive inductive effect (+ I) of 2-alkyl substituent of the imidazolium cation of ionic liquid showed stabilizing effect on the micelle formation by lowering of more negative zeta potential values of the IL-surfactant systems.

Graphical Abstract

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使用 1,3-二磺基-2-烷基咪唑氯化物离子液体改变十二烷基硫酸钠在水介质中的胶束化、热力学和表面特性

摘要利用具有不同大小烷基取代基（Me-、Et-、nBu-）的 2-烷基-1,3-二磺酸基咪唑氯化物的三种直接 -NSO3H 功能化布氏酸性离子液体，探讨了离子液体对阴离子表面活性剂十二烷基硫酸钠在不同离子液体浓度和温度（288.15 K、293.15 K、298.15 K、303.15 K 和 308.15 K）下，阴离子表面活性剂十二烷基硫酸钠在水介质中的聚集行为。通过电导率测量得到的离子液体-表面活性剂体系的临界胶束浓度（CMC）与表面张力和紫外-可见光谱技术得出的 CMC 值十分吻合。这些 CMCs 值被用来计算 IL-表面活性剂溶液的热力学参数，如标准胶化自由能（ΔG°m）、标准胶化焓（ΔH°m）和标准胶化熵（ΔS°m）。随着 IL 浓度和温度的增加，CMC 值持续下降。通过表面张力测量计算得出的堆积参数显示，所有混合胶束体系都呈小球形。使用傅立叶变换红外光谱法还观察到了 IL-表面活性剂溶液的结构变化。离子液体中咪唑阳离子的 2-烷基取代基增加了正感应效应（+ I），通过降低 IL-表面活性剂体系的负 zeta 电位值，对胶束的形成产生了稳定作用。图表摘要

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来源期刊

Colloid and Polymer Science 化学-高分子科学

CiteScore

4.60

自引率

4.20%

发文量

111

审稿时长

2.2 months

期刊介绍： Colloid and Polymer Science - a leading international journal of longstanding tradition - is devoted to colloid and polymer science and its interdisciplinary interactions. As such, it responds to a demand which has lost none of its actuality as revealed in the trends of contemporary materials science.