【摘要】 以矿物油、表面活性剂、疏水纳米SiO₂为原料，采用机械乳化法制备了含纳米SiO₂水包油型乳液。通过响应曲面实验得出SiO₂含量是影响乳液稳定性的主要因素，并在此基础上系统地研究了疏水纳米SiO₂对乳液稳定性及特性的影响。结果表明：当固体颗粒含量达到一定时，才能形成稳定的乳液，其形状与大小随着颗粒含量的增加而发生改变；与传统乳液相比，含固体颗粒乳液具有更好的热稳定性。其次，采用荧光显微镜、界面张力、界面流变等测试手段揭示了疏水颗粒稳定水包油型乳液的相应机制。结果表明：疏水纳米SiO₂吸附于油水界面改变了界面膜强度与结构，并与表活剂产生协同作用降低了油水界面张力，从而使乳液更加稳定。更多还原

【Abstract】 Mechanical emulsification was used to prepare an oil-in-water emulsion containing nano-SiO₂ using mineral oil, surfactant, and hydrophobic nano-SiO₂ as raw materials.By response surface experiments, the emulsion stability much depends on the nano-SiO₂ content.On this basis, the effect of hydrophobic nano-SiO₂ on emulsion stability and properties was thoroughly investigated.The results showed that a stable emulsion could be formed only when the content of solid particles reached a certain level, and the droplet shape and size changed with the increase of nano-SiO₂ content.Comparing with conventional emulsion, emulsion with solid SiO₂ particles exhibited greater thermal stability.Additionally, the corresponding mechanism of hydrophobic particles stabilizing oil-in-water emulsion was revealed with the help of a fluorescence microscope, interfacial tension, interfacial rheology, and other structure characterization methods.The results indicated that hydrophobic nano-SiO₂ adsorbed on the oil-water interface changed the strength and structure of the interfacial film, and synergized with surface activator to remarkably reduce the interfacial tension between oil and water, thus making the emulsion more stable.更多还原