Shih Chunyu, Yamamoto Ryoichi
Department of Chemical Engineering, Kyoto University, Kyoto 615-8510, Japan.
Phys Rev E Stat Nonlin Soft Matter Phys. 2014 Jun;89(6):062317. doi: 10.1103/PhysRevE.89.062317. Epub 2014 Jun 26.
The dynamics of charged colloids in an electrolyte solution is studied using direct numerical simulations via the smoothed profile method. We calculated the complex electrophoretic mobility μ(ω) of the charged colloids under an oscillating electric field of frequency ω. We show the existence of three dynamically distinct regimes, determined by the momentum diffusion and ionic diffusion time scales. The present results agree well with approximate theories based on the cell model in dilute suspensions; however, systematic deviations between the simulation results and theoretical predictions are observed as the volume fraction of colloids is increased, similar to the case of constant electric fields.
通过平滑轮廓法进行直接数值模拟，研究了电解质溶液中带电胶体的动力学。我们计算了在频率为ω的振荡电场下带电胶体的复电泳迁移率μ(ω)。我们展示了由动量扩散和离子扩散时间尺度决定的三种动态不同的状态的存在。目前的结果与基于稀悬浮液中细胞模型的近似理论非常吻合；然而，随着胶体体积分数的增加，模拟结果与理论预测之间出现了系统偏差，这与恒定电场的情况类似。
