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Transport in nanopores

机译:纳米孔中的运输

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摘要

Brownian dynamcis is used to describe the elimination of a particle aggregate through an absorbing pore. New dynamic effects are demonstrated by considering the distribution of vvelocity of the particles as well as position. In the transient state, as the system evolves toward the empty pore, the time dependent particle density is greater in the center of the pore than on the walls. The average dynamics of the particles is initially free diffusion with an early stage diffusion constant. Coupling between the position and the velocity of the particles sets up a flow field which contributes to the long time dynamics and leads to an increased value of effective long time diffusion constant. the transport of particles along the walls is enhanced. Particles are absorbed through the pore walls reducing the total flux at the exit of the pore. Based on these results, a prossible separation memchanism for a gas mixture in a nanopore is discussed.
机译:布朗动力用于描述通过吸收孔消除颗粒聚集体。通过考虑粒子的速度分布以及位置来展示新的动态效果。在过渡状态下,随着系统向空孔发展,时间相关的粒子密度在孔的中心大于壁上的密度。颗粒的平均动力学最初是具有早期扩散常数的自由扩散。粒子的位置和速度之间的耦合建立了一个流场,该流场有助于长时间的动力学,并导致有效的长时间扩散常数的值增加。沿壁的颗粒传输得到增强。颗粒通过孔壁吸收,从而减少了孔出口处的总通量。基于这些结果,讨论了纳米孔中气体混合物可能的分离机理。

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