C9pPHCNa与C10TABr混合水溶液的表面吸附和胶团形成

羧酸盐Gemini表面活性剂C9pPHCNa与季铵盐表面活性剂十烷基三甲基溴化铵(C10TABr)混合水溶液的胶团生成能力、降低水表面张力的能力和效率均出现明显的增效. 当C9pPHCNa在溶液中的摩尔分数(α1)为0.33时，cmcT(临界胶团总浓度)、γcmc(临界胶团总浓度对应的表面张力)、c20,T(降低20 mN•m^-1水表面张力所需的表面活性剂总浓度)这3个指标均达到最低值，分别为0.60 mmol•L^-1、23.5 mN•m^-1和1.58×10^-5 mol•L^-1. 在所有考察的溶液比例范围内，二组分在混合胶团和表面吸附层中的组成均接近等摩尔比，表现出强烈的分子间相互作用.

Surface Adsorption andMicelle Formation of C9pPHCNa and C10TABr Mixed Aqueous Solutions

The surface adsorption and micelle formation of the mixed anionic Gemini surfactant (C9pPHCNa) and cationic conventional surfactant (C10TABr) aqueous solutions have been investigated by surface tension method. The synergism occurred in the mixed systems and yielded maximum synergism at the mole fraction of C9pPHCNa in the bulk (α1) equaling to 0.33, where the two components equal electricity mixing in solution. The corresponding minimum values of the critical micelle concentration (cmcT), the surface tension (γcmc) and the total concentration required to reduce 20 mN•m^-1 surface tension of water (c20,T) are respectively 0.60 mmol•L^-1, 23.5 mN•m^-1 and 1.58×10^-5 mol•L^-1. Over the range of α1 studied, the molar compositions of C9pPHCNa and C10TABr both in the micelle and on the surface are close each other, which reflects strong interaction between the molecules.