2021/04/22 by Yue Yu, Kai Zhang, Yu, Yue +1
Engineering · #FOS: Physical sciences #Field-Flow Fractionation Techniques #Soft Condensed Matter (cond-mat.soft)
paper · pdf · doi:10.48550/arxiv.2104.10881
openalex publication_date 2021/04/22 · openalex created_date 2021/04/26 · openalex updated_date 2026/07/28
The collision dynamics of hard spheres and cylindrical pores is solved exactly, which is the minimal model for a regularly porous membrane. Nonequilibrium event-driven molecular dynamics simulations are used to show that the permeability P of hard spheres of size σ through cylinderical pores of size d follow the hindered diffusion mechanism due to size exclusion as P ∝ (1-σ/d)2. Under this law, the separation of binary mixtures of large and small particles exhibits a linear relationship between α-1/2 and P-1/2, where α and P are the selectivity and permeability of the smaller particle, respectively. The mean permeability through polydisperse pores is the sum of permeabilities of individual pores, weighted by the fraction of the single pore area over the total pore area.