Effect of Hydrodynamic Interactions on Self-Diffusion of Quasi-Two-Dimensional Colloidal Hard Spheres
© 2015 American Physical Society. We compare experimental results from a quasi-two-dimensional colloidal hard sphere fluid to a Monte Carlo simulation of hard disks with small particle displacements. The experimental short-time self-diffusion coefficient DS scaled by the diffusion coefficient at inf...
| Main Authors: | , , , |
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| Format: | Journal article |
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American Physical Society
2015
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| _version_ | 1797064759190749184 |
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| author | Thorneywork, A Rozas, R Dullens, R Horbach, J |
| author_facet | Thorneywork, A Rozas, R Dullens, R Horbach, J |
| author_sort | Thorneywork, A |
| collection | OXFORD |
| description | © 2015 American Physical Society. We compare experimental results from a quasi-two-dimensional colloidal hard sphere fluid to a Monte Carlo simulation of hard disks with small particle displacements. The experimental short-time self-diffusion coefficient DS scaled by the diffusion coefficient at infinite dilution, D0, strongly depends on the area fraction, pointing to significant hydrodynamic interactions at short times in the experiment, which are absent in the simulation. In contrast, the area fraction dependence of the experimental long-time self-diffusion coefficient DL/D0 is in quantitative agreement with DL/D0 obtained from the simulation. This indicates that the reduction in the particle mobility at short times due to hydrodynamic interactions does not lead to a proportional reduction in the long-time self-diffusion coefficient. Furthermore, the quantitative agreement between experiment and simulation at long times indicates that hydrodynamic interactions effectively do not affect the dependence of DL/D0 on the area fraction. In light of this, we discuss the link between structure and long-time self-diffusion in terms of a configurational excess entropy and do not find a simple exponential relation between these quantities for all fluid area fractions. |
| first_indexed | 2024-03-06T21:18:56Z |
| format | Journal article |
| id | oxford-uuid:40c56f91-a5a1-456e-9923-1e22176ac184 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T21:18:56Z |
| publishDate | 2015 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:40c56f91-a5a1-456e-9923-1e22176ac1842022-03-26T14:39:53ZEffect of Hydrodynamic Interactions on Self-Diffusion of Quasi-Two-Dimensional Colloidal Hard SpheresJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:40c56f91-a5a1-456e-9923-1e22176ac184Symplectic Elements at OxfordAmerican Physical Society2015Thorneywork, ARozas, RDullens, RHorbach, J© 2015 American Physical Society. We compare experimental results from a quasi-two-dimensional colloidal hard sphere fluid to a Monte Carlo simulation of hard disks with small particle displacements. The experimental short-time self-diffusion coefficient DS scaled by the diffusion coefficient at infinite dilution, D0, strongly depends on the area fraction, pointing to significant hydrodynamic interactions at short times in the experiment, which are absent in the simulation. In contrast, the area fraction dependence of the experimental long-time self-diffusion coefficient DL/D0 is in quantitative agreement with DL/D0 obtained from the simulation. This indicates that the reduction in the particle mobility at short times due to hydrodynamic interactions does not lead to a proportional reduction in the long-time self-diffusion coefficient. Furthermore, the quantitative agreement between experiment and simulation at long times indicates that hydrodynamic interactions effectively do not affect the dependence of DL/D0 on the area fraction. In light of this, we discuss the link between structure and long-time self-diffusion in terms of a configurational excess entropy and do not find a simple exponential relation between these quantities for all fluid area fractions. |
| spellingShingle | Thorneywork, A Rozas, R Dullens, R Horbach, J Effect of Hydrodynamic Interactions on Self-Diffusion of Quasi-Two-Dimensional Colloidal Hard Spheres |
| title | Effect of Hydrodynamic Interactions on Self-Diffusion of Quasi-Two-Dimensional Colloidal Hard Spheres |
| title_full | Effect of Hydrodynamic Interactions on Self-Diffusion of Quasi-Two-Dimensional Colloidal Hard Spheres |
| title_fullStr | Effect of Hydrodynamic Interactions on Self-Diffusion of Quasi-Two-Dimensional Colloidal Hard Spheres |
| title_full_unstemmed | Effect of Hydrodynamic Interactions on Self-Diffusion of Quasi-Two-Dimensional Colloidal Hard Spheres |
| title_short | Effect of Hydrodynamic Interactions on Self-Diffusion of Quasi-Two-Dimensional Colloidal Hard Spheres |
| title_sort | effect of hydrodynamic interactions on self diffusion of quasi two dimensional colloidal hard spheres |
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