DYNAMIC PERCOLATION THEORY FOR DIFFUSION OF INTERACTING PARTICLES - TRACER DIFFUSION IN A MULTICOMPONENT LATTICE-GAS

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Abstract

Dynamic percolation theory is used to obtain the tracer diffusion coefficient in multicomponent mixtures of “non interacting” lattice-gas (with only blocking interactions, i.e. double occupancy of a lattice site is forbidden) within the effective medium approximation (EMA). Our approach is based on regarding the background particles as a changing random environment for the tracer. The result is expressed in terms of local fluctuation time parameters, which we attempt to determine from the lattice-gas dynamics. Special attention is given to the single component and the binary mixture cases, were we compare two possible choices for these parameters. The resulting tracer diffusion coefficient for both choices compares well with numerical simulations whenever single bond dynamics and single bond EMA are expected to be reliable.
Original languageEnglish
Title of host publicationLARGE-SCALE MOLECULAR SYSTEMS
PublisherSpringer Boston
Pages437-443
Volume258
ISBN (Print)0-306-43914-X
StatePublished - 1991

Publication series

NameNATO ADVANCED SCIENCE INSTITUTES SERIES, SERIES B, PHYSICS

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