Surface Tension and Aggregation Properties of Novel Cationic Gemini Surfactants with Diethylammonium Headgroups and a Diamido Spacer
作者:Qi Zhang、Zhinong Gao、Feng Xu、Shuxin Tai、Xueguo Liu、Shaobo Mo、Fei Niu
DOI:10.1021/la3011212
日期:2012.8.21
A series of novel cationic gemini surfactants with diethylammonium headgroups and a diamido spacer were synthesized, and their surface and bulk properties were investigated by surface tension, electrical conductivity, fluorescence, viscosity, dynamic light scattering (DLS), and transmission electron microscopy (TEM) measurements. An interesting phenomenon, that is, the obvious decline in surface tension
合成了一系列具有二乙基铵头基和二氨基间隔基的新型阳离子双子表面活性剂,并通过表面张力,电导率,荧光,粘度,动态光散射(DLS)和透射电子显微镜(TEM)研究了它们的表面和本体性质。测量。在这些双子表面活性剂溶液中发现了一个有趣的现象,即当浓度增加到高于临界胶束浓度(cmc)时,表面张力明显下降,并提出了两种解释。这种表面张力行为可以通过本体相中抗衡离子活性的快速增加或随着cmc上方表面活性剂浓度的增加而继续填充界面来解释。更有趣的是,在这些双子表面活性剂的水溶液中不仅发现了囊泡,而且还发现了由表面活性剂浓度诱导的囊泡向较大的聚集体(海绵状聚集体)的转变,以及由盐诱导的囊泡和海绵状聚集体向胶束的转变。阳离子双子表面活性剂-水二元体系中首次报道的海绵状聚集体可能是由于高表面活性剂浓度下囊泡的粘附和融合所致。