Bauman Moscow State Technical University, 2nd Baumanskaya street 5, 105005 Moscow, Russia.
Soft Matter. 2018 Dec 5;14(47):9657-9674. doi: 10.1039/c8sm01538d.
Tunable interactions between colloidal particles in external conically rotating electric fields are calculated, while the (vertical) axis of the field rotation is normal to the (horizontal) particle motion plane. The comparison of different approaches, including the methods of noninteracting, self-consistent dipoles, and the boundary element method, indicates that the last method is the most suitable for tunable interaction analysis. Thorough analysis, performed for interactions in pairs and clusters of colloidal particles, indicate that two- and three-body interactions make the main contributions in the interaction energy, while the effect of high-order terms is negligible. The tunable interactions are determined by the dielectric properties of the particles and solvent and can be changed in a wide range, providing a rich variety for the experimental "design" of different interactions, including repulsion, attraction, combination of short-range repulsion with long-range attraction, barrier-type interactions with short-range attraction and long-range repulsion, and double-scale repulsive (core-shoulder) interactions. These conclusions can be generalized for magnetically induced tunable interactions. The results indicate that tunable interactions can be widely applied in self-assembly and particle-resolved studies of generic phenomena in fluids and crystals, and, therefore, are of broad interest in the fields of chemical physics, physical chemistry, materials science, and soft matter.
在外加圆锥形旋转电场中，计算了胶体粒子之间的可调相互作用，其中电场旋转的（垂直）轴垂直于（水平）粒子运动平面。不同方法的比较，包括非相互作用、自洽偶极子和边界元方法的方法，表明最后一种方法最适合可调相互作用分析。对胶体粒子对和聚集体相互作用的彻底分析表明，二体和三体相互作用对相互作用能的贡献最大，而高阶项的影响可以忽略不计。可调相互作用取决于粒子和溶剂的介电特性，可以在很大范围内改变，为不同相互作用的实验“设计”提供了丰富的多样性，包括排斥、吸引、短程排斥与远程吸引的结合、具有短程吸引和远程排斥的势垒型相互作用，以及双尺度排斥（核-肩）相互作用。这些结论可以推广到磁诱导可调相互作用。结果表明，可调相互作用可广泛应用于自组装和颗粒分辨研究流体和晶体中的一般现象，因此在物理化学、材料科学和软物质等领域具有广泛的兴趣。
