论文标题
布朗尼在受限禁闭中被带电的胶体运动
Brownian motion of a charged colloid in restricted confinement
论文作者
论文摘要
我们研究了一个带电的胶体的布朗运动，该胶体限制在两个带电的墙之间，以在胶体和壁之间进行小分离。该系统嵌入在离子溶液中。静电排斥和由于流体动力引起的扩散的综合作用导致垂直于狭窄壁的方向的特定运动。短时间内的表观扩散系数以及扩散特性时间被证明遵循Sigmoid曲线作为无量纲参数的函数。该参数取决于静电性能，可以通过调整溶液离子强度来控制。在低离子强度下，胶体移动更快并局部局部，而在高离子强度下，它移动较慢并探索壁之间的更宽区域，从而导致更大的扩散特性时间。
We study the Brownian motion of a charged colloid, confined between two charged walls, for small separation between the colloid and the walls. The system is embedded in an ionic solution. The combined effect of electrostatic repulsion and reduced diffusion due to hydrodynamic forces results in a specific motion in the direction perpendicular to the confining walls. The apparent diffusion coefficient at short times as well as the diffusion characteristic time are shown to follow a sigmoid curve as function of a dimensionless parameter. This parameter depends on the electrostatic properties and can be controlled by tuning the solution ionic strength. At low ionic strength, the colloid moves faster and is localized, while at high ionic strength it moves slower and explores a wider region between the walls, resulting in a larger diffusion characteristic time.
