Krüger Matthias, Rauscher Markus
Max-Planck-Institut für Metallforschung, Heisenbergstrasse 3, 70569 Stuttgart, Germany.
J Chem Phys. 2007 Jul 21;127(3):034905. doi: 10.1063/1.2753481.
We investigate the nonequilibrium fluid structure mediated forces between two colloids driven through a suspension of mutually noninteracting Brownian particles as well as between a colloid and a wall in stationary situations. We solve the Smoluchowski equation in bispherical coordinates as well as with a method of reflections, both in linear approximation for small velocities and numerically for intermediate velocities, and we compare the results to a superposition approximation considered previously. In particular, we find an enhancement of the friction (compared to the friction on an isolated particle) for two colloids driven side by side as well as for a colloid traveling along a wall. The friction on tailgating colloids is reduced. Colloids traveling side-by-side experience a solute induced repulsion while tailgating colloids are attracted to each other.
我们研究了在相互非相互作用的布朗粒子悬浮液中驱动的两个胶体之间以及静止情况下胶体与壁之间的非平衡流体结构介导的力。我们在双球坐标中以及用反射法求解了斯莫卢霍夫斯基方程，在小速度的线性近似下以及中间速度的数值计算中都是如此，并将结果与先前考虑的叠加近似进行了比较。特别地，我们发现并排驱动的两个胶体以及沿壁移动的胶体的摩擦力增强（与孤立粒子上的摩擦力相比）。尾随胶体上的摩擦力减小。并排移动的胶体经历溶质诱导的排斥，而尾随胶体相互吸引。
