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Bridging scales in disordered porous media by mapping molecular dynamics onto intermittent Brownian motion.


ABSTRACT: Owing to their complex morphology and surface, disordered nanoporous media possess a rich diffusion landscape leading to specific transport phenomena. The unique diffusion mechanisms in such solids stem from restricted pore relocation and ill-defined surface boundaries. While diffusion fundamentals in simple geometries are well-established, fluids in complex materials challenge existing frameworks. Here, we invoke the intermittent surface/pore diffusion formalism to map molecular dynamics onto random walk in disordered media. Our hierarchical strategy allows bridging microscopic/mesoscopic dynamics with parameters obtained from simple laws. The residence and relocation times - tA, tB - are shown to derive from pore size d and temperature-rescaled surface interaction ?/kBT. tA obeys a transition state theory with a barrier?~?/kBT and a prefactor?~10-12 s corrected for pore diameter d. tB scales with d which is rationalized through a cutoff in the relocation first passage distribution. This approach provides a formalism to predict any fluid diffusion in complex media using parameters available to simple experiments.

SUBMITTER: Bousige C 

PROVIDER: S-EPMC7884405 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature

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Bridging scales in disordered porous media by mapping molecular dynamics onto intermittent Brownian motion.

Bousige Colin C   Levitz Pierre P   Coasne Benoit B  

Nature communications 20210215 1


Owing to their complex morphology and surface, disordered nanoporous media possess a rich diffusion landscape leading to specific transport phenomena. The unique diffusion mechanisms in such solids stem from restricted pore relocation and ill-defined surface boundaries. While diffusion fundamentals in simple geometries are well-established, fluids in complex materials challenge existing frameworks. Here, we invoke the intermittent surface/pore diffusion formalism to map molecular dynamics onto r  ...[more]

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