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A surfactant-free microemulsion composed of isopentyl acetate, n-propanol, and water

机译：不含表面活性剂的微乳液，由乙酸异戊酯， n -丙醇和水组成

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It has been demonstrated that in the absence of traditional surfactants, microemulsions can form from a ternary mixture of oil, water, and an amphi-solvent. These microemulsions are called surfactant-free microemulsions (SFMEs). To date, only a small number of SFME systems have been reported, and the current understanding of SFMEs is very limited. Herein, we report an SFME consisting of isopentyl acetate (IA), n-propanol, and water, in which IA (a simple ester compound) and n-propanol are used as the oil phase and amphi-solvent, respectively. The microstructures and structural transition of the SFME were investigated by cyclic voltammetry, fluorescence spectroscopy, and UV-visible spectroscopy techniques. Moreover, three kinds of microstructures, namely, oil-in-water (O/W), bicontinuous (BC), and water-in-oil (W/O), have been identified in the SFME, which are directly verified by cryo-TEM observations. A change in the composition of the SFME may lead to a structural transition from O/W through BC to W/O or vice versa, which is similar to the case of traditional surfactant-based microemulsions (SBMEs). To the best of our knowledge, this is the first time that the microstructures and structural transition of an SFME obtained using a simple ester compound as the oil phase have been identified.
机译：已经证明，在没有传统的表面活性剂的情况下，微乳液可以由油，水和两性溶剂的三元混合物形成。这些微乳液称为无表面活性剂的微乳液（SFME）。迄今为止，仅报道了少量的SFME系统，目前对SFME的理解非常有限。在此，我们报道了由乙酸异戊酯（IA）， n -丙醇和水组成的SFME，其中使用了IA（一种简单的酯化合物）和 n -丙醇分别为油相和两性溶剂。通过循环伏安法，荧光光谱法和紫外可见光谱法研究了SFME的微观结构和结构转变。此外，在SFME中已鉴定出三种类型的微观结构，即水包油（O / W），双连续（BC）和油包水（W / O），这些结构可以通过冷冻机直接验证。 -TEM观察。 SFME组成的变化可能导致从O / W到BC的结构转变为W / O，反之亦然，这与传统的基于表面活性剂的微乳液（SBME）情况相似。据我们所知，这是首次发现使用简单酯化合物作为油相获得的SFME的微观结构和结构转变。

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