Davies Gary B, Botto Lorenzo
Institute for Computational Physics, Allmandring 3, 70569 Stuttgart, Germany.
Soft Matter. 2015 Oct 28;11(40):7969-76. doi: 10.1039/c5sm01815c. Epub 2015 Sep 1.
Capillary interactions have emerged as a tool for the directed assembly of particles adsorbed at fluid-fluid interfaces, and play a role in controlling the mechanical properties of emulsions and foams. In this paper, following Davies et al. [Adv. Mater., 2014, 26, 6715] investigation into the assembly of ellipsoidal particles at interfaces interacting via dipolar capillary interactions, we numerically investigate the interaction between tilted ellipsoidal particles adsorbed at a fluid-fluid interface as their aspect ratio, tilt angle, bond angle, and separation vary. High-resolution Surface Evolver simulations of ellipsoidal particle pairs in contact reveal an energy barrier between a metastable tip-tip configuration and a stable side-side configuration. The side-side configuration is the global energy minimum for all parameters we investigated. Lattice Boltzmann simulations of clusters of up to 12 ellipsoidal particles show novel highly symmetric flower-like and ring-like arrangements.
毛细管相互作用已成为一种用于在流体-流体界面吸附的颗粒定向组装的工具，并在控制乳液和泡沫的机械性能方面发挥作用。在本文中，继戴维斯等人[《先进材料》，2014年，26卷，6715页]对通过偶极毛细管相互作用在界面处组装椭球形颗粒的研究之后，我们对吸附在流体-流体界面的倾斜椭球形颗粒之间的相互作用进行了数值研究，研究了它们的纵横比、倾斜角、键角和间距的变化情况。对接触的椭球形颗粒对进行的高分辨率表面演化器模拟揭示了亚稳的尖端-尖端构型和稳定的侧面-侧面构型之间的能垒。对于我们研究的所有参数，侧面-侧面构型是全局能量最小值。对多达12个椭球形颗粒簇进行的格子玻尔兹曼模拟显示出新颖的高度对称的花状和环状排列。
