School of Chemistry and Chemical Engineering, Yangzhou University, Jiangsu Province 225002, People's Republic of China.
Soft Matter. 2017 Feb 7;13(5):1012-1019. doi: 10.1039/c6sm02690g. Epub 2017 Jan 13.
Single, Janus, and Cerberus emulsions are prepared in one system consisting of three oils: silicone (SO), fluorocarbon (FO) and ethoxylated trimethylolpropane triacrylate (ETPTA) with mutual solubility. An aqueous solution of Pluronic F127, which is an poly(ethylene oxide)/poly(propylene oxide) co-polymer of average composition EOPOEO, was employed as the continuous phase. The three-dimensional phase diagram of the oils was determined, and different oil compositions within the various regions of the phase diagram were emulsified by one-step vortex mixing with an F127 aqueous solution. The result showed single, Janus, and Cerberus emulsions within the different regions of the phase diagram; i.e. the emulsions reflected the equilibrium system. The topology of the Cerberus droplets is to an overwhelming extent linear-singlet and exclusively lobe order of EF/FO/SF. Since the results indicate a significant effect of the equilibrium interfacial tensions on the drop topology, thermodynamic calculations were made using the experimentally determined interfacial tensions. The results, as expected, show that the Cerberus emulsions are thermodynamically preferred over separate drops of the individual oils. In addition, the calculations demonstrate that the order of lobes within a drop is thermodynamically favored.
单乳液、Janus 乳液和 Cerberus 乳液是在由三种油（硅氧烷（SO）、全氟碳（FO）和乙氧基化三羟甲基丙烷三丙烯酸酯（ETPTA））组成的单一体系中制备的，这些油具有互溶性。聚氧乙烯/聚氧丙烯共聚物 Pluronic F127 的水溶液，其平均组成 EOPOEO，被用作连续相。测定了油的三维相图，并通过一步涡旋混合用 F127 水溶液对相图的各个区域内的不同油组成进行乳化。结果表明，在相图的不同区域内存在单乳液、Janus 乳液和 Cerberus 乳液；即乳液反映了平衡体系。Cerberus 液滴的拓扑结构在很大程度上是线性单链的，并且仅具有 EF/FO/SF 的叶序。由于结果表明平衡界面张力对液滴拓扑结构有显著影响，因此使用实验确定的界面张力进行了热力学计算。不出所料，结果表明 Cerberus 乳液在热力学上优先于各个油的单独液滴。此外，计算表明液滴内叶序在热力学上是有利的。
