Institute of Physics, The Federal University of Rio Grande do Sul, PO Box 15051, 91501-970 Porto Alegre, RS, Brazil.
J Chem Phys. 2013 May 7;138(17):174901. doi: 10.1063/1.4802994.
We investigate a double-layer of penetrable ions near a charged wall. We find a new mechanism for charge reversal that occurs in the weak-coupling regime and, accordingly, the system is suitable for the mean-field analysis. The penetrability is achieved by smearing-out the ionic charge inside a sphere, so there is no need to introduce non-electrostatic forces and the system in the low coupling limit can be described by a modified version of the Poisson-Boltzmann equation. The predictions of the theory are compared with the Monte Carlo simulations.
我们研究了带电壁附近的可穿透双层离子。我们发现了一种新的电荷反转机制，该机制发生在弱耦合区域，因此该系统适合平均场分析。可穿透性是通过在球体内部使离子电荷弥散化来实现的，因此不需要引入非静电作用力，并且在低耦合极限下，系统可以用修改后的泊松-玻尔兹曼方程来描述。理论预测与蒙特卡罗模拟进行了比较。
