纳米通道中聚电解质电泳的耗散粒子动力学模拟
Polyelectrolyte Electrophoresis in Nanochannels: A Dissipative Particle Dynamics Simulation
摘要：
我们提出了介观的DPD模拟的限制纳米几何结构中，不同的盐浓度和表面滑移条件下的电泳。特别注意的是，电渗流（电渗流）的迁移的电渗流的影响。有效的电子迁移率被发现强烈地依赖于边界性质，即，滑移长度和双电层的宽度。导出了电渗迁移率和总迁移率的解析表达式，与数值计算结果吻合较好。表征滑移效应的相关量被发现是无量纲量$κ\: δ_B$，其中$δ_B$是滑移长度，并且$κ^{-1}$是沟道边界处的有效静电屏蔽长度。
英文摘要：
We present mesoscopic DPD-simulations of polyelectrolyte electrophoresis in confined nanogeometries, for varying salt concentration and surface slip conditions. Special attention is given to the influence of electroosmotic flow (EOF) on the migration of the polyelectrolyte. The effective polyelectrolyte mobility is found to depend strongly on the boundary properties, i.e., the slip length and the width of the electric double layer. Analytic expressions for the electroosmotic mobility and the total mobility are derived which are in good agreement with the numerical results. The relevant quantity characterizing the effect of slippage is found to be the dimensionless quantity $κ\: δ_B$, where $δ_B$ is the slip length, and $κ^{-1}$ an effective electrostatic screening length at the channel boundaries.
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