The single-file diffusion of water in the straight channels of two different crystalline microporous aluminosilicates (zeolites bikitaite and Li-ABW) was studied by comparing the results of molecular dynamics computer simulations with the predictions of anomalous diffusion theory modeled by using fractional diffusion equations. At high coverage, the agreement is reasonably good, in particular for sufficiently large displacements and sufficiently long times. At low coverage, interesting phenomena appear in the simulation results, such as multimodal propagators, which could be interpreted on the basis of fractional Fokker-Planck equations. The results are discussed also in view of different theories that have been proposed to model the single-file diffusion process.

Fractional diffusion interpretation of simulated single-file systems in microporous materials / Demontis, Pierfranco; Suffritti, Giuseppe Baldovino. - In: PHYSICAL REVIEW E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS. - ISSN 1539-3755. - 74:(2006), pp. 051112-1-051112-13. [10.1103/PhysRevE.74.051112]

Fractional diffusion interpretation of simulated single-file systems in microporous materials

DEMONTIS, Pierfranco;SUFFRITTI, Giuseppe Baldovino
2006-01-01

Abstract

The single-file diffusion of water in the straight channels of two different crystalline microporous aluminosilicates (zeolites bikitaite and Li-ABW) was studied by comparing the results of molecular dynamics computer simulations with the predictions of anomalous diffusion theory modeled by using fractional diffusion equations. At high coverage, the agreement is reasonably good, in particular for sufficiently large displacements and sufficiently long times. At low coverage, interesting phenomena appear in the simulation results, such as multimodal propagators, which could be interpreted on the basis of fractional Fokker-Planck equations. The results are discussed also in view of different theories that have been proposed to model the single-file diffusion process.
2006
Fractional diffusion interpretation of simulated single-file systems in microporous materials / Demontis, Pierfranco; Suffritti, Giuseppe Baldovino. - In: PHYSICAL REVIEW E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS. - ISSN 1539-3755. - 74:(2006), pp. 051112-1-051112-13. [10.1103/PhysRevE.74.051112]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11388/47021
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