微乳液
庚烷
肺表面活性物质
微观结构
相(物质)
分析化学(期刊)
丙醇
材料科学
扩散
化学
电导率
电阻率和电导率
化学工程
热力学
色谱法
有机化学
物理化学
复合材料
生物化学
物理
甲醇
电气工程
工程类
作者
Xiaoxing Lü,Shaoxia Xie,Jian Kuang,Hujun Xie
标识
DOI:10.1016/j.molliq.2020.114485
摘要
A comprehensive experimental investigation on the microstructures of microemulsion constructed with Gemini surfactant has been carried out. The structural transition of the microemulsion system, 14-4-14/1-propanol/n-heptane/water, from water-in-oil (W/O) to bi-continuous (B.C.) has been characterized by electrical conductivity and cyclic voltammetry. Being a typically percolative system, spherical nanodroplets are observed in the W/O system, while interlinks of water and oil continuous phases are observed in the middle phase, as confirmed by cryo-TEM. Most importantly, the role of water is clearly revealed. Increasing the water content results in size enhancement as well as improvement of micropolarity and diffusion behavior. Results of DSC measurements suggest that free water dominates only at high total water content. The unfrozen water which is not detected by DSC takes a considerable amount in the W/O system at low total water content, while the interphasal water reaches over 50% of total water in the middle phase system.
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