Everts J C, Samin S, Elbers N A, van der Hoeven J E S, van Blaaderen A, van Roij R
Institute for Theoretical Physics, Center for Extreme Matter and Emergent Phenomena, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands.
Phys Chem Chem Phys. 2017 Jun 7;19(22):14345-14357. doi: 10.1039/c7cp01935a.
We theoretically and experimentally investigate colloid-oil-water-interface interactions of charged, sterically stabilized, poly(methyl-methacrylate) colloidal particles dispersed in a low-polar oil (dielectric constant ε = 5-10) that is in contact with an adjacent water phase. In this model system, the colloidal particles cannot penetrate the oil-water interface due to repulsive van der Waals forces with the interface whereas the multiple salts that are dissolved in the oil are free to partition into the water phase. The sign and magnitude of the Donnan potential and/or the particle charge is affected by these salt concentrations such that the effective interaction potential can be highly tuned. Both the equilibrium effective colloid-interface interactions and the ion dynamics are explored within a Poisson-Nernst-Planck theory, and compared to experimental observations.
我们从理论和实验上研究了分散在与相邻水相接触的低极性油（介电常数ε = 5 - 10）中的带电、空间稳定的聚甲基丙烯酸甲酯胶体颗粒的胶体 - 油 - 水界面相互作用。在这个模型系统中，由于与界面的排斥范德华力，胶体颗粒无法穿透油水界面，而溶解在油中的多种盐可以自由分配到水相中。唐南电位和/或颗粒电荷的符号和大小受这些盐浓度的影响，从而可以高度调节有效相互作用电位。在泊松 - 能斯特 - 普朗克理论框架内探索了平衡有效胶体 - 界面相互作用和离子动力学，并与实验观察结果进行了比较。
