Netz R R
Sektion Physik, LMU Munich, Theresienstrasse 37, 80333 Munich, Germany.
Phys Rev Lett. 2003 Sep 26;91(13):138101. doi: 10.1103/PhysRevLett.91.138101. Epub 2003 Sep 25.
Using dynamic simulations, the electrophoretic mobility of counterions at a substrate with fixed or mobile surface charges under the action of a lateral electric field is studied. The lateral charge inhomogeneity and corrugation of the substrate is taken into account. Because of the pronounced electrofriction between counterions and surface ions, a large fraction of counterions is practically immobilized for highly charged substrates. This explains the experimentally observed saturation of the electrophoretic mobility of charged particles in the limit of high surface charge density.
利用动态模拟，研究了在横向电场作用下，具有固定或可移动表面电荷的基底上抗衡离子的电泳迁移率。考虑了基底的横向电荷不均匀性和波纹。由于抗衡离子与表面离子之间存在明显的电摩擦，对于高电荷基底，很大一部分抗衡离子实际上是固定不动的。这解释了在高表面电荷密度极限下，带电粒子电泳迁移率的实验观测饱和现象。
