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采用耗散颗粒动力学模拟方法从介观水平上研究了表面活性剂分子链长对油包水型微乳液形成的影响。结果表明:对于疏水链长不同的表面活性剂/油/水体系在一定的油水比和表面活性剂分子浓度下可以形成油包水型微乳液,此时体系的平均界面张力值最低,表面活性剂分子的平均末端距最小,即分子链最弯曲。而表面活性剂分子浓度相同时,其疏水链越长,形成油包水型微乳液所需的油水比越大;在油水比相同的情况下,疏水链越长,表面活性剂分子浓度对微乳液的影响越小。此模拟结果从介观水平上提供了表面活性剂分子链长对微乳液的形成的影响,为微乳液的实际应用提供理论指导。
The effects of surfactant molecular chain length on the formation of water-in-oil microemulsion were investigated by means of the dispersion particle dynamics simulation at mesoscopic level. The results show that the water-in-oil microemulsion can be formed at a certain oil-water ratio and surfactant concentration for surfactant / oil / water systems with different hydrophobic chain lengths. The mean interfacial tension The average terminal distance of the agent molecule is the smallest, ie the most benign molecular chain. When the surfactant concentration is the same, the longer the hydrophobic chain, the greater the oil-water ratio required to form the water-in-oil microemulsion. At the same oil-water ratio, the longer the hydrophobic chain, the more the surfactant concentration is The effect of the emulsion is smaller. The simulation results provide the influence of the molecular chain length of surfactant on the formation of microemulsion from mesoscopic level, and provide theoretical guidance for the practical application of microemulsion.