Department of Chemistry, UGC-Centre for Advanced Studies, Guru Nanak Dev University, Amritsar 143 005, India.
J Colloid Interface Sci. 2011 Nov 1;363(1):275-83. doi: 10.1016/j.jcis.2011.07.049. Epub 2011 Jul 27.
The interfacial and bulk properties of mixtures of the anionic surfactant (dioctyl sulphosuccinate sodium salt, AOT) with zwitterionic surfactants 3-(N,N-dimethyldodecylammonio) propane sulfonate (DPS), 3-(N,N-dimethyltetradecylammonio) propane sulfonate (TPS), 3-(N,N-dimethylhexadecylammonio) propane sulfonate (HPS) have been studied employing surface tension, fluorescence, and viscometric techniques in aqueous media at 25 °C. It is observed that these mixtures exhibit synergism and these synergistic interactions increase with the enhancement of the hydrocarbon chain of the zwitterionic surfactant. The various physicochemical properties such as critical micelle concentration (cmc), surface excess concentration (Г(max)), minimum area per molecule (A(min)), aggregation number (N(agg)), interaction parameters (β(σ), β(m)), and thermodynamic parameters such as standard Gibbs free energy of adsorption (ΔG(ads)(o)), excess free energy of micellization (ΔG(ex)), and standard Gibbs free energy of micellization (ΔG(m)(o)) have been evaluated. The negative values of ΔG(m)(o) and ΔG(ads)(o) show that the micelle formation and adsorption of surfactant at the air/solution interface is energetically favorable, while a negative value of ΔG(ex) ensures stability of the mixed micelles formed. The Regular Solution Approximation, Motomura and Rosen's approaches have been used to explain and compare the results. The packing parameter (p) ensures the formation of vesicles or bilayers for AOT+DPS/TPS mixtures, which can potentially be used as delivery agents for industrial applications.
在 25°C 的水介质中，利用表面张力、荧光和黏度技术研究了阴离子表面活性剂（二辛基磺基琥珀酸钠盐，AOT）与两性离子表面活性剂 3-（N，N-二甲基十二烷基铵）丙烷磺酸盐（DPS）、3-（N，N-二甲基十四烷基铵）丙烷磺酸盐（TPS）、3-（N，N-二甲基十六烷基铵）丙烷磺酸盐（HPS）混合物的界面和体相性质。结果表明，这些混合物表现出协同作用，并且这些协同相互作用随着两性离子表面活性剂的烃链的增强而增加。还评估了各种物理化学性质，如临界胶束浓度（cmc）、表面过剩浓度（Г(max)）、最小分子面积（A(min)）、聚集数（N(agg)）、相互作用参数（β(σ)、β(m)）和热力学参数，如标准吸附吉布斯自由能（ΔG(ads)(o)）、过剩胶束化吉布斯自由能（ΔG(ex)）和标准胶束化吉布斯自由能（ΔG(m)(o)）。ΔG(m)(o)和ΔG(ads)(o)的负值表明，表面活性剂在气/溶液界面上的胶束形成和吸附是能量有利的，而ΔG(ex)的负值确保了形成的混合胶束的稳定性。正则溶液近似、本间和罗森的方法被用来解释和比较结果。规则溶液近似法（Regular Solution Approximation）、Motomura 和 Rosen 的方法被用来解释和比较结果。堆积参数（p）确保了 AOT+DPS/TPS 混合物形成囊泡或双层，这可能被用作工业应用的递送剂。
