The effective hydrodynamic radius is not a constant
Soft Condensed Matter
2022-01-19 v1
Abstract
The effective hydrodynamic radius is usually assumed to be a constant in testing the Stokes-Einstein relation by its variants. We have performed molecular dynamics simulations with ortho-terphenyl and Kob-Andersen model to examine the assumption and found the effective hydrodynamic radius is not a constant but decreases with decreasing temperature. The variant of Stokes-Einstein relation is not established but Stokes-Einstein relation is valid by considering the changes of the effective hydrodynamic radius. We propose the assumption should be seriously evaluated when using variants to test Stokes-Einstein relation.
Cite
@article{arxiv.2201.05804,
title = {The effective hydrodynamic radius is not a constant},
author = {Gan Ren},
journal= {arXiv preprint arXiv:2201.05804},
year = {2022}
}