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- W2077881092 abstract "We study the tracer exchange of molecules between the phase adsorbed in one-dimensional channels and the surrounding gas phase by molecular dynamics simulations. Under the conditions of single-file diffusion, a novel boundary effect is observed. The shape of the tracer-exchange concentration profiles deviates from those obtained under the conditions of normal diffusion. Compared to the profiles for normal diffusion, which correspond to the same degree of exchange, the equilibrium concentration is reached faster at the boundaries and slower in the middle part of the channel in the case of single-file diffusion. This boundary effect is observed for the system neopentane in AlPO4-5 (which was chosen as a reference system), as well as for modified systems. The effect can be understood considering two diffusion mechanisms which occur in parallel. First, the diffusion of the whole chain of particles, that is, the center-of-mass diffusion, obeying the laws of normal diffusion. Second, the individual movement of the particles relative to the center of mass of the chain. The second mechanism admits additional displacements which, on average, lead to an accelerated exchange of the marginal particles." @default.
- W2077881092 created "2016-06-24" @default.
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- W2077881092 date "2005-08-16" @default.
- W2077881092 modified "2023-09-24" @default.
- W2077881092 title "Influence of Boundaries of Nanoporous Crystals on Molecular Exchange under the Conditions of Single-File Diffusion" @default.
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- W2077881092 doi "https://doi.org/10.1021/jp052314k" @default.
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