Department of Chemistry , Case Western Reserve University , 10900 Euclid Avenue , Cleveland , Ohio 44106 , United States.
ACS Appl Mater Interfaces. 2018 Jul 5;10(26):21765-21781. doi: 10.1021/acsami.8b07178. Epub 2018 Jun 22.
Fluid-fluid interfaces have widespread applications in personal care products, the food industry, oil recovery, mineral processes, etc. and are also important and versatile platforms for generating advanced materials. In Pickering emulsions, particles stabilize the fluid-fluid interface, and their presence reduces the interfacial energy between the two fluids. To date, most Pickering emulsions stabilized by 2D particles make use of clay platelets or GO nanosheets. These systems have been used to template higher order hybrid, functional materials, most commonly, armored polymer particles, capsules, and Janus nanosheets. This review discusses the experimental and computational study of the assembly of sheet-like 2D particles at fluid-fluid interfaces, with an emphasis on the impact of chemical composition, and the use of these assemblies to prepare composite structures of dissimilar materials. The review culminates in a perspective on the future of Pickering emulsions using 2D particle surfactants, including new chemical modification and types of particles as well as the realization of properties and applications not possible with currently accessible systems, such as lubricants, porous structures, delivery, coatings, etc.
液-液界面在个护产品、食品工业、采油、矿物加工等领域有着广泛的应用，也是制备先进材料的重要且多功能的平台。在 Pickering 乳液中，颗粒稳定了液-液界面，其存在降低了两相间的界面能。迄今为止，大多数由二维颗粒稳定的 Pickering 乳液利用粘土片层或 GO 纳米片。这些体系已被用于模板化具有更高阶结构的混合功能材料，最常见的是装甲聚合物颗粒、胶囊和 Janus 纳米片。本文综述了在液-液界面上二维片状颗粒组装的实验和计算研究，重点介绍了化学组成的影响，以及利用这些组装体来制备不同材料的复合结构。本文的结论是对使用二维颗粒表面活性剂的 Pickering 乳液的未来展望，包括新的化学修饰和颗粒类型，以及实现目前可获得的系统无法实现的特性和应用，如润滑剂、多孔结构、输送、涂层等。
