论文标题
双乳液在载有颗粒界面的自发形成
Spontaneous Formation of Double Emulsions at Particle-Laden Interfaces
论文作者
论文摘要
双重乳液由于其隔室结构，在食品，农业和药物应用中至关重要。传统上，双重乳液依赖于油溶性和水溶性表面活性剂或外部刺激反应材料的存在，并且需要顺序的液滴形成或独特的液体设计。我们报告了异常现象，其中一旦将水纳米颗粒分散体与胶质胶束溶液接触后，双重乳液会自发形成。纳米级水滴以肿胀的胶束形式的油成核。纳米颗粒会随着时间的流逝而囊括饱和油相的水上壳。值得注意的是，我们发现纳米颗粒的逐渐表面激活是自双乳化和控制乳液强度的关键。我们基于这个新发现，并设计了一种用于双重乳液形成的新型系统。这种方法是一种可扩展的自序策略，用于制备芯壳双重乳液，通过使用胶束作为运输车辆，可以在相对阶段分散纳米颗粒。将纳米颗粒纳入自发乳化系统为设计基于乳液的材料开辟了新的途径。
Double emulsions, due to their compartmental structures, are essential in food, agricultural, and pharmaceutical applications. Traditionally, double emulsifications rely on the presence of both oil-soluble and water-soluble surfactants or external stimuli responsive materials and require sequential droplet formation settings or unique fluidic designs. We report on unusual phenomenon where double emulsions are spontaneously formed as soon an aqueous nanoparticle dispersion is placed in contact with an oleic micellar solution. Nanoscale water droplets nucleate in oil in the form of swollen micelles. Nanoparticles form a water-shell encapsulating the saturated oil phase with swollen micelles over time. Remarkably, we find that the gradual surface-activation of nanoparticles is key in self-double emulsification and controlling the emulsion intensity. We build on this new discovery and design a novel system for double emulsion formation. This approach is a scalable self-sequential strategy for preparing core-shell double emulsions that disperses nanoparticles in the opposite phase by employing micelles as transport vehicles. Incorporating nanoparticles into spontaneous emulsification systems opens novel routes for designing emulsion-based materials.
