Anomalously slow transport in single-file diffusion with slow binding kinetics

作者：Farrell Spencer G; Rutenberg Andrew D^*

来源：PHYSICAL REVIEW E, 2018, 98(2): 022114.

DOI：10.1103/PhysRevE.98.022114

We computationally study the effects of binding kinetics to the channel wall, leading to transient immobility, on the diffusive transport of particles within narrow channels, that exhibit single-file diffusion (SFD). We find that slow binding kinetics leads to an anomalously slow diffusive transport. Remarkably, the scaled diffusivity D characterizing transport exhibits scaling collapse with respect to the occupation fraction p of sites along the channel. We present a simple "cage-physics" picture that captures the characteristic occupation fraction p(scale) and the asymptotic 1/p(2) behavior for p/p scale greater than or similar to 1. We confirm that subdiffusive behavior of tracer particles is controlled by the same D as particle transport.

• 出版日期2018-8-14