Lu Ting, Li Zihui, Huang Jianbin, Fu Honglan
Beijing National Laboratory for Molecular Science, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China.
Langmuir. 2008 Oct 7;24(19):10723-8. doi: 10.1021/la801301v. Epub 2008 Aug 23.
The phase behavior as well as the microstructures of the cationic gemini surfactant and anionic conventional surfactant aqueous two-phase system (ASTP) have been studied. The ASTP formation can be attributed to the coexistence of different kinds of aggregates in the upper and lower phases. The effects of temperature, shearing, surfactant concentration and mixing molar ratio on the phase separation of the ASTP-forming systems are systematically investigated. The ASTP can be destroyed by applying shear and increasing temperature. In this process, the lamellar structures (flat bilayers) in the ASTP are transformed into vesicles. Variation of surfactant structure also affects the phase behavior and the aggregates transformation. Appropriate molecular packing is crucial for the formation of ASTP.
研究了阳离子双子表面活性剂与阴离子传统表面活性剂双水相体系（ASTP）的相行为以及微观结构。ASTP的形成可归因于上下相中不同种类聚集体的共存。系统研究了温度、剪切、表面活性剂浓度和混合摩尔比对形成ASTP体系相分离的影响。施加剪切和升高温度可破坏ASTP。在此过程中，ASTP中的层状结构（扁平双层）转变为囊泡。表面活性剂结构的变化也会影响相行为和聚集体转变。合适的分子堆积对ASTP的形成至关重要。
