Clustering effects on the diffusion of patchy colloids in disordered porous media
| Autor: | M. Ya. Korvatska, M. F. Holovko |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Work (thermodynamics)
Materials science geometrical porosity Physics and Astronomy (miscellaneous) Condensed matter physics Physics QC1-999 self-diffusion coefficient FOS: Physical sciences probe particle porosity patchy colloids Condensed Matter - Soft Condensed Matter Condensed Matter Physics Physics::Fluid Dynamics Matrix (mathematics) Distribution function Cluster (physics) Particle enskog theory Soft Condensed Matter (cond-mat.soft) Diffusion (business) disordered porous media Porous medium Porosity |
| Zdroj: | Condensed Matter Physics, p 33605 (2021) |
| Popis: | Enskog theory is extended for the description of the self-diffusion coefficient of patchy colloidal fluid in disordered porous media. The theory includes the contact values of fluid-fluid and fluid-matrix pair distribution functions that are modified to include the dependence from the so-called probe particle porosity, $\phi$, in order to correctly describe the effects of trapping the fluid particles by a matrix. The proposed expressions for the modified contact values of fluid-fluid and fluid-matrix pair distribution functions include three terms. Namely, a hard sphere contribution obtained by us in the previous work [Holovko M. F., Korvatska M. Ya., Condens. Matter Phys., 2020, 23, 23605], the depletion contribution connected with the cluster-cluster and cluster-matrix repulsion and the intramolecular correlation inside the cluster. It is shown that the last term leads to a remarkable decrease of the self-diffusion coefficient at a low fluid density. With a decreasing matrix porosity, this effect becomes weaker. For intermediate fluid densities, the depletion contribution leads to an increase of the self-diffusion coefficient in comparison with the hard sphere fluid. For a sufficiently dense fluid, the self-diffusion coefficient strongly decreases due to a hard sphere effect. The influence of the cluster size and the type of clusters as well as of the parameters of porous media is investigated and discussed in detail. Comment: 10 pages, 4 figures |
| Databáze: | OpenAIRE |
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