一些离子表面活性剂与非离子 Triton X-114 在水和水/2,2,2-三氟乙醇混合物中聚集行为的比较研究,Industrial & Engineering Chemistry Research

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一些离子表面活性剂与非离子 Triton X-114 在水和水/2,2,2-三氟乙醇混合物中聚集行为的比较研究
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2024-02-12 , DOI: 10.1021/acs.iecr.3c02040
Rajesh Banik ₁ , Bipin Bihari Mondal ₁ , Raju Sardar ₁ , Soumen Ghosh ₁

Affiliation

2,2,2-三氟乙醇(TFE)对离子表面活性剂十六烷基三甲基溴化铵(CTAB)、十六烷基三甲基对甲苯磺酸铵(CTAT)、十二烷基硫酸钠(SDS)、N-月桂酰肌氨酸钠(SDDS)、使用张力测定法、电导率测定法、荧光测定法、时间分辨荧光测定法和微量热测定法研究了水溶液中的非离子表面活性剂 Triton X-114 (TX-114)。随着 TFE 浓度的增加，离子头基的胶束电荷密度降低，导致胶束溶液中离子表面活性剂溶液（SDS、SDDS、CTAB 和 CTAT）的临界胶束浓度 (CMC) 降低。然而，对于非离子表面活性剂TX-114，极性头基发生一些构象变化，导致CMC值增加。进行时间分辨荧光衰减测量以获得 TFE 分子渗透到胶束尾层的证据。胶束聚集数随着溶剂浓度的增加而下降，这表明较高浓度的混合溶剂减少了离子表面活性剂胶束化所需的单体数量，而对于非离子TX-114，这表明形成胶束的分子发生了一些结构变化。 TFE 的存在。

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Comparative Study of the Aggregation Behavior of Some Ionic Surfactants with Nonionic Triton X-114 in Water and a Water/2,2,2-Trifluoroethanol Mixture

The influence of 2,2,2-trifluoroethanol (TFE) on the micellar properties of ionic surfactants hexadecyltrimethylammonium bromide (CTAB), hexadecyltrimethylammonium p-toluenesulfonate (CTAT), sodium dodecyl sulfate (SDS), N-lauroylsarcosine sodium salt (SDDS), and nonionic surfactant Triton X-114 (TX-114) in aqueous solutions was studied using tensiometry, electrical conductivity, fluorimetry, time-resolved fluorescence, and microcalorimetry. With increasing concentrations of TFE, the micellar charge densities of the ionic head groups decrease, causing a decrease in the critical micelle concentration (CMC) of ionic-surfactant solutions (SDS, SDDS, CTAB, and CTAT) in micellar solutions. However, for nonionic surfactant TX-114, the polar headgroup undergoes some conformational changes causing an increase in the value of CMC. Time-resolved fluorescence decay measurements were done to get evidence of penetration of TFE molecules into the stern layer of the micelle. The micellar aggregation number declines with increasing concentration of solvent, indicating a higher concentration of mixed solvent reducing the number of monomers needed for micellization for ionic surfactants, whereas for nonionic TX-114, it indicates some structural changes of the molecule forming the micelle in the presence of TFE.

更新日期：2024-02-12

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