Abstract In the present study, SiO2 nanoparticles were first hydrophobically modified and then added into anionic surfactant sodium dodecyl sulfate (SDS) stabilized water-based foam to improve the foam stability. The foam stability was experimentally evaluated by measuring surface tension, Zeta potential and half-life of the foam. The foam stabilizing mechanism was also studied from a micro perspective by molecular dynamics simulation through analyzing the equilibration configuration and MSD curve of both SDS surfactant and water molecules. The results show that foam exhibits an optimal stability when SiO2 concentration is 0.35 wt% under a specific surfactant concentration (0.5 wt%) in this work. The addition of SiO2 nanoparticles with suitable concentration could improve the adsorption between SDS molecules and nanoparticles, thus limiting the movement of SDS and restricting the movement of surrounding water molecules, which is beneficial to enhance the foam stability.

中文翻译：

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疏水改性 SiO2 纳米颗粒对水性 SDS 泡沫稳定性的影响

摘要 本研究首先对SiO2纳米粒子进行疏水改性，然后将其加入阴离子表面活性剂十二烷基硫酸钠（SDS）稳定的水性泡沫中，以提高泡沫稳定性。泡沫稳定性通过测量泡沫的表面张力、Zeta 电位和半衰期进行实验评估。通过分析SDS表面活性剂和水分子的平衡构型和MSD曲线，通过分子动力学模拟，从微观角度研究了泡沫稳定机制。结果表明，在特定表面活性剂浓度（0.5wt%）下，当SiO2浓度为0.35wt%时，泡沫表现出最佳稳定性。加入合适浓度的SiO2纳米颗粒可以提高SDS分子与纳米颗粒之间的吸附，