Pickering emulsions comprising liquid droplets stabilized by solid microparticles have gained much attention in the field of cosmetics, inks, and drug delivery systems. To ensure that microparticles in Pickering emulsions are localized at the surface of liquid droplets, ultrasonic spectroscopy analysis combined with scattering function theory was conducted in this study. Two specific cases were investigated: (1) silica particles and liquid droplets independently dispersed in liquid and (2) silica particles effectively localized at the surface of the droplets. It was found that the core–shell model was effective for analyzing nanoparticles anchored at the surface of oil droplets. Conversely, it was found that an effective shell comprised of solid particles was no longer observed as the particle size or the distance between solid particles increased. When a large solid particle was applied, the ultrasonic spectra resembled those of conventional surfactant-stabilized emulsions without solid stabilizers.

包含由固体微粒稳定的液滴的皮克林乳液在化妆品、油墨和药物递送系统领域引起了广泛关注。为了确保Pickering乳液中的微粒集中在液滴表面，本研究采用超声波光谱分析结合散射函数理论。研究了两种具体情况：（1）二氧化硅颗粒和液滴独立地分散在液体中；（2）二氧化硅颗粒有效地定位在液滴表面。研究发现，核壳模型对于分析锚定在油滴表面的纳米粒子是有效的。相反，发现随着粒径或固体颗粒之间的距离增加，不再观察到由固体颗粒组成的有效壳。当使用大的固体颗粒时，超声波谱与不含固体稳定剂的传统表面活性剂稳定乳液的超声波谱相似。