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Homogenization of mesoscopic theories: Effective properties of model membranes
Author(s) -
Lam R.,
Vlachos D. G.,
Katsoulakis M. A.
Publication year - 2002
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690480517
Subject(s) - mesoscopic physics , homogenization (climate) , statistical physics , nanoporous , multiscale modeling , membrane , monte carlo method , molecular dynamics , kinetic monte carlo , materials science , physics , mechanics , nanotechnology , chemistry , mathematics , condensed matter physics , computational chemistry , biodiversity , ecology , biochemistry , statistics , biology
A new mathematical framework for modeling diffusion in nanoporous materials or on surfaces exhibits heterogeneity in properties over large length scales and retains molecular scale information, typically captured only by molecular simulations (kinetic Monte Carlo). It first uses newly developed mesoscopic equations derived rigorously from underlying master equations by coarse‐graining statistical mechanics techniques. Homogenization techniques are then used to derive the leading‐order effective mesoscopic models that are subsequently solved by spectral methods. These solutions are also compared to direct numerical simulations for selected 2‐D model membranes with defects, when attractive adsorbate‐adsorbate interactions affect particle difSsion. Both the density and dispersion of defects significantly alter the macroscopic behavior in terms of fluxes and concentration patterns, especially when phase transitions can occur. In the presence of adsorbate‐adsorbate interactions, permeation through a nanoporous film can depend on the face of a membrane exposed to the high‐pressure side. Homogenization techniques also could offer a promising alternative to direct numerical simulations, when complex, large‐scale heterogeneities are present.