Marina Paula Facal, Cheng Chongling, Sedev Rossen, Stocco Antonio, Binks Bernard P, Wang Dayang
Future Industries Institute, University of South Australia, Mawson Lakes, SA, 5095, Australia.
State Key Laboratory for Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, China.
Angew Chem Int Ed Engl. 2018 Jul 20;57(30):9510-9514. doi: 10.1002/anie.201805410. Epub 2018 Jun 20.
Surface-inactive, highly hydrophilic particles are utilized to effectively and reversibly stabilize oil-in-water emulsions. This is a result of attractive van der Waals forces between particles and oil droplets in water, which are sufficient to trap the particles in close proximity to oil-water interfaces when repulsive forces between particles and oil droplets are suppressed. The emulsifying efficiency of the highly hydrophilic particles is determined by van der Waals attraction between particle monolayer shells and oil droplets enclosed therein and is inversely proportional to the particle size, while their stabilizing efficiency is determined by van der Waals attraction between single particles and oil droplets, which is proportional to the particle size. This differentiation in mechanism between emulsification and stabilization will significantly advance our knowledge of emulsions, thus enabling better control and design of emulsion-based technologies in practice.
表面惰性、高度亲水性的颗粒被用于有效且可逆地稳定水包油乳液。这是由于颗粒与水中油滴之间存在吸引力范德华力，当颗粒与油滴之间的排斥力被抑制时，这些力足以将颗粒捕获在靠近油水界面的位置。高度亲水性颗粒的乳化效率由颗粒单层壳与包裹在其中的油滴之间的范德华吸引力决定，且与颗粒大小成反比，而它们的稳定效率由单个颗粒与油滴之间的范德华吸引力决定，该吸引力与颗粒大小成正比。乳化和稳定机制上的这种差异将显著推进我们对乳液的认识，从而在实践中更好地控制和设计基于乳液的技术。
