利用界面扩张流变技术,研究了两性咪唑类离子液体表面活性剂1-磺丙基-3-十二烷基咪唑内盐(C12imSP)的界面聚集行为,探讨传统表面活性剂十二烷基硫酸钠(SDS)对C12imSP界面聚集行为的影响机制.结果表明,少量SDS的加入可以填补界面上疏松的C12imSP分子间的空位,界面上形成表面活性剂混合吸附膜,界面张力显著降低;提高SDS的浓度,其分子从体相向界面层的扩散交换占优势,界面层分子逐渐达到饱和吸附,此后体系中有混合胶束形成.体相胶束中富集的SDS分子对C12imSP分子的“收纳”作用及进一步的“挽留”作用,加之C12imSP分子本身相对较大的空间位阻效应导致界面上的C12imSP分子一旦通过扩散作用被交换至体相,其很难再回复到表面层,即界面膜以SDS分子为主.通过调节体系中SDS的含量,可以实现对混合体系SDS/C12imSP/NaCl(0.1 mol/L)界面聚集行为的调控,进而实现对界面膜性质的调控.
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