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用最大泡压法考察季铵盐Gemini表面活性剂C12-2-Ex-C12?2Br(x=1,2,3)在气/液表面吸附动力学行为,研究表明增加表面活性剂体相浓度和温度将加快分子扩散速度,因此提高了表面吸附的动力学效果.增加联接链长度x减小了分子预聚集倾向,溶液中的单分子浓度增加,有利于初始扩散,使γt降低.接近饱和吸附时,由于x较大的单元分子在表面层占据的截面积也较大,降低了表面层甲基端基的覆盖度,相对升高了介平衡表面张力.与对应的同头基同碳原子数的十二烷基三甲基溴化铵(C12TABr)比较,C12-2-E1-C12?2Br分子更倾向于吸附在表面层上.
The maximum bubble pressure method was used to investigate the adsorption kinetics of the quaternary ammonium salt Gemini surfactant C12-2-Ex-C12 2Br (x = 1,2,3) on the gas / liquid surface. The results showed that increasing the concentration of surfactant phase And temperature will accelerate the rate of molecular diffusion, thus improving the kinetic effect of surface adsorption.Adding chain length x reduces the propensity of molecules to pre-aggregate and increase the concentration of single molecules in solution, which is favorable for the initial diffusion and the decrease of γt. Adsorption, due to x larger unit molecules in the surface layer occupies a larger cross-sectional area, reducing the coverage of the surface of the methyl end group, relative increase in the mediated surface tension equivalent to the same base with the same carbon The C12-2-E1-C12? 2Br molecules are more likely to be adsorbed on the surface layer than the dodecyltrimethylammonium bromide (C12TABr).