Theoretical Soft Matter and Biophysics, Institute for Advanced Simulation and Institute of Complex Systems, Forschungszentrum Jülich, D-52425 Jülich, Germany.
Phys Rev Lett. 2011 Oct 7;107(15):158301. doi: 10.1103/PhysRevLett.107.158301. Epub 2011 Oct 6.
The dynamical deformation of ultrasoft colloids as well as their dynamic frictional forces are numerically investigated, when one colloid is dragged past another at constant velocity. Hydrodynamic interactions are captured by a particle-based mesoscopic simulation method. At vanishing relative velocity, the equilibrium repulsive force-distance curve is obtained. At large drag velocities, in contrast, we find an apparent attractive force for departing colloids along the dragging direction. The deformation, in the close encounter of colloids, and the energy dissipation are examined as a function of the drag velocity and their separation.
当一个胶体以恒定速度拖曳另一个胶体时，数值研究了超软胶体的动力学变形及其动态摩擦力。通过基于粒子的介观模拟方法捕获了流体动力学相互作用。在相对速度为零时，获得了平衡排斥力-距离曲线。相比之下，在较大的拖动速度下，我们发现对于沿拖动方向离开的胶体，存在明显的吸引力。作为拖动速度和它们之间的分离的函数，检查了胶体的近距离遭遇时的变形和能量耗散。
