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表面活性剂分支结构对O/W型微乳液影响的介观模拟研究
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摘要
本文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支结构对O/W型微乳液形成的影响。结果表明:对于不同链分支结构的表面活性剂/油/水体系在一定的油水比和表面活性剂浓度下可以形成O/W型微乳液,此时体系的平均界面张力值最低。当表面活性剂浓度相同时,随着油水比的降低,直链表面活性剂H2T2最利于O/W型微乳液的形成;而在油水比相同时,随着表面活性剂浓度的增加,直链表面活性剂H2T2在较大浓度范围内依然为稳定的微乳液。也就是说直链表面活性剂最利于O/W型微乳液的形成。此模拟结果从介观水平上提供了表面活性剂分支结构对O/W型微乳液形成的影响,为微乳液的实际应用提供理论指导。
Dissipative particle dynamics(DPD) simulation is performed to study the effect of the surfactant chain branch on the formation of the OAV microemulsion system on mesoscopic level.The results show that the surfactant/oil/water systems can form oil-in-water microemulsion in a certain oil/water ratio and surfactant concentration,also have the lowest interfacial tension.The linear surfactant H2T2 is most conducive to the formation with the decrease of oil/water ratio at the same surfactant concentration.Meanwhile,H2T2 is still stable microemulsion in the largest concentration range with surfactant concentration increasing at the same oil/water ratio.That is to say,straight chain surfactant is the most conducive to the formation of OAV microemulsion.The simulation results provide the effect of the surfactant chain branch on the microemulsion systems from the mesoscopic scale,and supply theoretical guidance for the practical application of the microemulsion.
引文
[1]Valeriy V,Ginzburg K C,Prasanna K J,et al.J.Phys.Chem.B,2011,115(16):4654.
    [2]Li Y M,Guo Y Y,Bao M T,et al.I.J Colloid Interface Sci.,2011,361(2):573.

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