Test of the diffusing-diffusivity mechanism using near-wall colloidal dynamics
Abstract
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.
Cite
@article{arxiv.1706.02039,
title = {Test of the diffusing-diffusivity mechanism using near-wall colloidal dynamics},
author = {Mpumelelo Matse and Mykyta V. Chubynsky and John Bechhoefer},
journal= {arXiv preprint arXiv:1706.02039},
year = {2017}
}
Comments
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 Portions of this work previously appeared as arXiv:1602.07644, which was subsequently withdrawn.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