Dynamics of dense hard sphere colloidal systems: A numerical analysis
| Autor: | Paolo Sibani, Carsten Svaneborg |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Physics
Statistical Mechanics (cond-mat.stat-mech) Logarithm Numerical analysis FOS: Physical sciences Poisson distribution 01 natural sciences Potential energy 010305 fluids & plasmas symbols.namesake Molecular dynamics Colloid 0103 physical sciences symbols Partition (number theory) Statistical physics cond-mat.stat-mech 010306 general physics Condensed Matter - Statistical Mechanics Cage size |
| Zdroj: | Sibani, P & Svaneborg, C 2019, ' Dynamics of dense hard sphere colloidal systems : A numerical analysis ', Physical Review E, vol. 99, no. 4, 042607 . https://doi.org/10.1103/PhysRevE.99.042607 |
| ISSN: | 2470-0053 2470-0045 |
| Popis: | The applicability to dense hard sphere colloidal suspensions of a general coarse-graining approach called Record Dynamics (RD) is tested by extensive molecular dynamics simulations. We reproduce known results as logarithmic diffusion and the logarithmic decay of the average potential energy per particle. We provide quantitative measures for the cage size and identify the displacements of single particles corresponding to cage breakings. We then partition the system into spatial domains. Within each domain, a subset of intermittent events called quakes is shown to constitute a log-Poisson process, as predicted by Record Dynamics. Specifically, these events are shown to be statistically independent and Poisson distributed with an average depending on the logarithm of time. Finally, we discuss the nature of the dynamical barriers surmounted by quakes and link RD to the phenomenology of aging hard sphere colloids. Comment: 7 pages, 8 figures |
| Databáze: | OpenAIRE |
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