The influence of transport of large particles and macromolecules on membrane separation efficiency and permeation rate limitation has been observed in many separation processes of microscopic scale. In this paper a Monte Carlo simulation model is developed to study this phenomenon. The membrane pore space is described by a three-dimensional network model of inter-connected cylinders pores. The effective radii of these pores are distributed according to experimentally reported pore size distribution. The paths of the injected particles throughout the pore space are determined by transition probability function proportional to the pore flux. Pores are considered completely blocked when particles of effective radii comparable with the pore size pass through them. Thus, the membrane capability of transport can ultimately vanish and, therefore, this process is a percolation process and it is characterized by a percolation threshold below which the membrane losses its macroscopic connectivity. When the model applied to this problem, the predictions are in excellent agreement with the available experimental data.
Journal: TechConnect Briefs
Volume: 1, Nanotechnology 2010: Advanced Materials, CNTs, Particles, Films and Composites
Published: June 21, 2010
Pages: 551 - 554
Industry sector: Advanced Materials & Manufacturing
Topic: Nanoparticle Synthesis & Applications