Abstract

Microemulsion and reverse microemulsion exhibited important applications in many fields. Bola-surfactant as a specific type of surfactants has a certain impact on the formation and stability of the microemulsion and reverse microemulsion. In this work, the formation and stability of the O/W and reverse W/O microemulsion at different surfactant concentration, inorganic salt, temperature and shear rate were researched using Dissipative particle dynamics (DPD) simulation on mesoscopic level. The results show that two types of Microemulsions could form and mutually transform with changing the oil-water ratio under the same other conditions. The O/W Microemulsion emulsified by a little surfactants and have better abbility to resist inorganic salt, temperature and shear rate comparing to the reverse W/O Microemulsion. The simulation results provide new insight into formation, transformation and stability conditions of different microemulsions from the mesoscopic scale, and supply theoretical guidance for the practical application of the microemulsions.

摘要

微乳液和反微乳液在许多领域都有重要的应用。Bola-表面活性剂作为一种特定类型的表面活性剂，对微乳液和反相微乳液的形成和稳定性有一定的影响。在这项工作中，使用介观水平的耗散粒子动力学（DPD）模拟研究了不同表面活性剂浓度、无机盐、温度和剪切速率下 O/W 和反 W/O 微乳液的形成和稳定性。结果表明，在其他条件相同的情况下，随着油水比的变化，两种微乳液可以形成并相互转化。O/W微乳液通过少量表面活性剂乳化，与反W/O微乳液相比，具有更好的抗无机盐、温度和剪切速率的能力。