Test of the diffusing-diffusivity mechanism using near-wall colloidal dynamics
| Autor: | John Bechhoefer, Mykyta V. Chubynsky, Mpumelelo Matse |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Statistical Mechanics (cond-mat.stat-mech) business.industry Dynamics (mechanics) FOS: Physical sciences 02 engineering and technology Condensed Matter - Soft Condensed Matter 021001 nanoscience & nanotechnology Thermal diffusivity Tracking (particle physics) 01 natural sciences Mechanism (engineering) Colloid Optics Chemical physics 0103 physical sciences Soft Condensed Matter (cond-mat.soft) SPHERES Diffusion (business) 010306 general physics 0210 nano-technology business Displacement (fluid) Condensed Matter - Statistical Mechanics |
| DOI: | 10.48550/arxiv.1706.02039 |
| Popis: | The mechanism of diffusing diffusivity predicts that, in environments where the diffusivity changes gradually, the displacement distribution becomes non-Gaussian, even though the mean-squared displacement (MSD) grows linearly with time. Here, we report single-particle tracking measurements of the diffusion of colloidal spheres near a planar substrate. Because the local effective diffusivity is known, we have been able to carry out the first direct test of this mechanism for diffusion in inhomogeneous media. Comment: 13 pages, 12 figures (including supplement. Portions of this work previously appeared as arXiv:1602.07644, which was subsequently withdrawn. This version adds a new author and presents new data and analysis. Main conclusions in both papers are the same |
| Databáze: | OpenAIRE |
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