双子阳离子表面活性剂胶束聚集数的测定

DETERMINATION OF THE MICELLE AGGREGATION NUMBER OF GEMINI CATIONIC SURFACTANTS

在20～25℃范围内,以芘为探针,二甲苯酮为猝灭剂用荧光光度法测定了双子阳离子表面活性剂1,3-丙二胺N,N,-二烷基-2-羟丙基-N,N,N′,N′-四甲基二胺二氯化物(简写为GCnNCl2,n=12,14,16)的胶束聚集数N。结果表明:双子阳离子表面活性剂的胶束聚集数具有浓度依赖性,Nagg随浓度增大而线性增大。探针分子所处环境的微极性随浓度增大逐渐减弱。

The micelle aggregation number（Nagg） of Gemini cationic surfactants N,N＇-alkyl-2-hydroxyl-N,N,N＇,N＇-tetramethyl diamonium dichloride（abbreviated as GCnNCl2,n =12,14,16）,was determined by steady-state fluorescence measurements in the temperature range of 20~35 oC,the pyrene as the fluorescence probe and diphenyl ketone as the quencher.The results indicated that Nagg of GCnNCl2 increases linearly with the increasing surfactant concentration within a certain concentration range,but the micropolarity of pyrene decreases with the increasing concentration.