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The Interaction of Glymes with Surfactant Micelles
Journal of Surfactants and Detergents ( IF 1.6 ) Pub Date : 2020-11-28 , DOI: 10.1002/jsde.12476
Nicholas P. Petropolis 1 , Harrison M. Petropolis 1 , Nicole E. MacNeil 1 , Taylor M. Doucet 1 , D. Gerrard Marangoni 1
Affiliation  

The critical micelle concentrations (CMC) values and counterion dissociation (α values) have been determined for a number of mixed micellar systems consisting of two typical ionic surfactants and glycol ethers (glymes) as cosurfactants, namely diethylene glycol dimethyl ether, diethylene glycol diethyl ether, triethylene glycol dimethyl ether, and tetraethylene glycol dimethyl ether. Conductance experiments were used to determine the CMC and α values of the mixed micelles as a function of glyme concentration in the aqueous mixed solvent. Favorable interactions between sodium dodecyl sulfate micelles and glyme cosurfactants were deduced from the decreases in the CMC values and the large increase in the α values of these systems as a function of increasing glyme concentration in the mixed solvents. In contrast to the anionic surfactant/glyme systems, in general, there appeared to be little favorable interactions between the surfactant and glymes when micelles of the cationic surfactant dodecyltrimethylammonium bromide were formed in water/glyme solvent systems containing an increasing amount of the glymes. The interaction of glymes with the surfactant micelles was examined closely via 13C nuclear magnetic resonance (NMR) chemical shifts for both surfactant and glyme carbons; these chemical shifts changes were interpreted in terms of the distribution and the localization of the glymes in the aggregates. Finally, partition constants, determined from two‐dimensional diffusion‐oriented spectroscopy (2D‐DOSY) experiments, were used to calculate thermodynamic quantities of transfer of the glymes between the bulk phase and the self‐assembled aggregates. All these results are interpreted in terms of the key contributions that both the glyme ethoxylated groups and alkyl endgroups make to the hydrophobic interactions.

中文翻译:

甘氨酸与表面活性剂胶束的相互作用

已确定了由两种典型的离子表面活性剂和乙二醇醚(甘醇二甲醚)作为辅助表面活性剂组成的许多混合胶束系统的临界胶束浓度(CMC)值和抗衡离子解离(α值),即二甘醇二甲醚,二甘醇二乙醚,三甘醇二甲醚和四甘醇二甲醚。电导实验用于确定混合胶束的CMC和α值随水性混合溶剂中甘醇二甲醚浓度的变化。从CMC值的降低和α的大幅度增加推导了十二烷基硫酸钠胶束与甘醇二酸酯表面活性剂之间的良好相互作用。这些系统的值取决于混合溶剂中甘醇二甲醚浓度的增加。与阴离子表面活性剂/甘醇二甲酸酯系统相反,一般而言,当阳离子表面活性剂十二烷基三甲基溴化铵的胶束在水/甘醇二甲醚含量增加的水/甘醇二甲醚溶剂体系中形成时,表面活性剂与甘醇二甲酸酯之间几乎没有有利的相互作用。甘氨酸与表面活性剂胶束的相互作用通过 13进行了仔细检查表面活性剂和甘醇二甲醚碳的C核磁共振(NMR)化学位移;这些化学位移的变化是根据聚集物中甘醇二甲醚的分布和位置来解释的。最后,根据二维扩散定向光谱(2D-DOSY)实验确定的分配常数,用于计算体相和自组装聚集体之间的甘氨酸二甲醚转移的热力学量。所有这些结果都以甘醇二甲氧基乙氧基化基团和烷基端基对疏水相互作用的关键贡献来解释。
更新日期:2021-01-19
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