无表面活性剂微乳液体系：N,N－二甲基甲酰胺/呋喃甲醛/水

通常微乳液一般由四个组分构成：水相、油相、表面活性剂和助表面活性剂。本文报道了一种不含表面活性剂的微乳液体系(简称SFME)，由呋喃甲醛(油相)，水和N,N－二甲基甲酰胺(DMF)三组分构成，不含传统的表面活性剂。对其相行为进行了研究，发现存在一个单相微乳液区和一个两相平衡区。采用电导率法和冷冻蚀刻电镜(FF-TEM)考察了单相区域中微乳液的微结构，结果表明可分为油包水(O/W)、双连续(BC)和水包油(W/O)三个区域。液滴直径介于40-70nm。

A Novel Surfactant‐free Microemulsion System: N,N‐Dimethyl Formamide/Furaldehyde/H2O

Generally, a microemulsion consists of oil, water, surfactant and sometimes cosurfactant. Herein, for the first time to our knowledge, a novel surfactant‐free microemulsion (SFME), consisting of furaldehyde (oil phase), water and N,N‐dimethyl formamide (DMF) without the amphiphilic molecular structure of traditional surfactant is reported. The phase behavior of the ternary system was investigated, finding that a single‐phase microemulsion region and a two‐phase region were formed. The electrical conductivity measurement was employed to investigate the single‐phase microemulsion region. On the basis of the percolation theory, the single‐phase microemulsion region was identified to consist of three different microregions: furaldehyde‐in‐water (O/W), bicontinuous region and water‐in‐furaldehyde (W/O), which were further proved by freeze‐fracture transmission electron microscopy (FF‐TEM) observations. The diameter of the microemulsion spherical droplets is in the range of 40–70 nm.