Related Experiment Video
Updated: Feb 15, 2026

Deciphering the Structural Effects of Activating EGFR Somatic Mutations with Molecular Dynamics Simulation
Published on: May 20, 2020
Structure and Gas Transport at the Polymer-Zeolite Interface: Insights from Molecular Dynamics Simulations
Ravi C Dutta1, Suresh K Bhatia1
1School of Chemical Engineering, The University of Queensland , Brisbane, QLD 4072, Australia.
Abstract:
We investigate the structure of polyimide (PI) at the surface of a silicalite zeolite (MFI), as part of a model hybrid organic-inorganic mixed matrix membrane system, through equilibrium molecular dynamics simulations. Furthermore, we report a comparison of the adsorption and transport characteristics of pure components CO2 and CH4 in PI, MFI, and PI-MFI composite membranes. It is seen that incorporation of MFI zeolite into PI results in the formation of densified polymer layers (rigidified region) near the surface, having thickness around 1.2 nm, before bulklike behavior of the polymer is attained, contrary to empirical fits suggesting the existence of an approximately 1 μm thick interface between the polymer and filler. This region offers an extra resistance to gas diffusion especially for the gas with a larger kinetic diameter, CH4, thus improving the CO2/CH4 kinetic selectivity in the PI-MFI composite membrane. Furthermore, we find that the kinetic selectivity of CO2 over CH4 in the rigidified region increases with temperature and that additivity of transport resistances in MFI, interfacial layer, and bulklike region of the polymer satisfactorily explains transport behavior in the composite sandwich investigated. The gas adsorption isotherms are extracted considering the dynamics and structural transitions in the PI and PI-MFI composite upon gas adsorption, and it is seen that the rigidified layer affects the gas adsorption in the polymer in the PI-MFI hybrid system. A significant increase in CO2/CH4 selectivity as well as gas permeability is observed in the PI-MFI composite membrane compared to that in the pure PI polymer membrane, which is correlated with the high selectivity of the rigidified interfacial layer in the polymer. Thus, while enhancing transport resistance, the rigidified layer is beneficial to membrane selectivity, leading to improved performance based on the Robeson upper bound plot for polymers.
More Related Videos
08:54Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
Published on: January 25, 2020
06:37Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package
Published on: September 17, 2021
Related Concept Videos
Gas Exchange and Transport
Kinetic Molecular Theory and Gas Laws Explain Properties of Gas Molecules
Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion
Polymers: Defining Molecular Weight
The number average molecular weight (Mn) is the summation of the number...
Polymers: Molecular Weight Distribution
Polymers