Abstract

To study the formation and stability of the O/W and reverse W/O microemulsion, dissipative particle dynamics (DPD) simulation was utilized to investigate the system composed of oil, water and Gemini surfactants. The effects of oil-water ratio, temperature, inorganic salt and shear rate were discussed in the simulation. Controlled of the formation process and stability of microemulsions by analyzing the interfacial tension of oil and water interfaces, end-to-end distance of Gemini surfactants and the translucent three-dimensional structures of formed aggregates. Two types microemulsions could form and mutually transform with changing the oil-water ratio. In conclusion, the O/W microemulsion has better temperature, salt and shear tolerance comparing to the reverse W/O microemulsion. The results of the research using DPD simulation expanded the theoretical knowledge of microemulsion on the molecular level, which is of great importance to develop new microemulsion systems with other surfactants and provided better theoretical guidance for the application of microemulsions.

摘要

为了研究 O/W 和反 W/O 微乳液的形成和稳定性，耗散粒子动力学 (DPD) 模拟用于研究由油、水和 Gemini 表面活性剂组成的体系。模拟中讨论了油水比、温度、无机盐和剪切速率的影响。通过分析油水界面的界面张力、Gemini 表面活性剂的端到端距离和形成的聚集体的半透明三维结构来控制微乳液的形成过程和稳定性。随着油水比的改变，两种类型的微乳液可以形成并相互转化。总之，O/W 微乳液与反向 W/O 微乳液相比具有更好的温度、盐和剪切耐受性。