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水和乙二醇-水混合体系中的离子液体-阳离子表面活性剂混合胶束自聚焦-电导法 表面张立法和光谱研究法—

来源:上海谓载 浏览 14 次 发布时间:2021-12-16

4.结论


观察到,十六烷基-3-甲基咪唑氯化铵(CET+[C10min][Cl])和纯[C10min][Cl]的混合体系中,西三胺的cmc值介于纯[C10min][Cl]和CET之间。在混合体系中,cmc值随着[C10min][Cl]摩尔分数的增加而增加,证实其形成胶束的趋势小于纯表面活性剂分子。cmc值也随着溶液中DEG体积百分比的增加而增加,这是由于随着溶剂极性的降低,表面活性剂的疏溶剂性降低。cmc b cmc*、βb 0和(f1和f2)b 1的观察值清楚地表明了混合物的非理想行为,并且还表明混合胶束中CET和[C10min][Cl]分子之间存在比纯组分更强的相互作用。纯组分和混合物的ΔGm值均为负值,表明胶束形成是热力学自发的。ΔGad 0的负值大于ΔGm0的负值表明,在空气-溶液界面的吸附比在本体溶液中形成胶束更有利。由表面张力法计算的Γmax和Amin值对于确定表面活性剂分子在气液界面的排列非常有用。Γmax值为我们提供了关于液/气界面吸附效率的信息,该值随着溶液中DEG体积百分比的增加而降低。DEG实际上在界面上与混合表面活性剂系统竞争,因此减少了其数量,从而降低了吸附效率。此外,P的值为b0。33,表明形成的胶束/混合胶束本质上是球形的。从紫外-可见光谱可以得出结论,[C10min][Cl]与CET形成混合胶束,这从存在和不存在[C10min][Cl]时的cmc值可以清楚地看出。在cmc以下,大部分离子对形成,但一旦达到cmc,这些离子对就会转变为[C10min][Cl]/CET混合胶束和可溶性染料分子。


致谢


U.Farooq感谢UGC以BSR(基础科学研究)的形式提供奖学金,N.A.Malik感谢化学系主任、伊斯兰教理工大学(IIST)、Awantipora、普拉玛、J&K等提供必要的设施。


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