Varga I, Yamada H, Kun F, Matuttis H-G, Ito N
Department of Theoretical Physics, University of Debrecen, P.O. Box 5, H-4010 Debrecen, Hungary.
Phys Rev E Stat Nonlin Soft Matter Phys. 2005 May;71(5 Pt 1):051405. doi: 10.1103/PhysRevE.71.051405. Epub 2005 May 31.
We propose an experimental technique for an easy to control realization of a binary dipolar monolayer where the two components have oppositely oriented dipole moments constrained perpendicular to the plane of motion without the application of an external field. The experimental setup ensures that hydrodynamic effects do not play a crucial role in the structure formation, the particles move deterministically due to the dipole-dipole interaction. At low concentrations, cluster-cluster aggregation occurs with chainlike morphologies, while at high concentration the particles self-assemble into various types of binary crystal lattices, in good agreement with the theoretical predictions. The structures formed by the particles are found to be sensitive to external perturbations due to the central interparticle forces, however, static friction arising at the contact surface of particles can increase the stability compared to systems with only viscous friction.
我们提出了一种实验技术，用于轻松实现二元偶极单层，其中两个组分具有相反取向的偶极矩，且这些偶极矩垂直于运动平面受到约束，无需施加外部场。该实验装置确保流体动力学效应在结构形成过程中不起关键作用，粒子由于偶极 - 偶极相互作用而确定性地移动。在低浓度下，会发生具有链状形态的簇 - 簇聚集，而在高浓度下，粒子会自组装成各种类型的二元晶格，这与理论预测非常吻合。发现由于粒子间的中心力，粒子形成的结构对外部扰动敏感，然而，与仅具有粘性摩擦的系统相比，粒子接触表面产生的静摩擦可以增加稳定性。
