Nonequilibrium noise in electrophoresis: the microion wind
Statistical Mechanics
2009-07-03 v1 Soft Condensed Matter
Abstract
We analyze theoretically the dynamics of a single colloidal particle in an externally applied electric field. The thermal motions of microions lead to an anisotropic, nonequilibrium source of noise, pro- portional to the field, in the effective Langevin equation for the colloid. The fluctuation-dissipation ratio depends strongly on frequency, and the colloid if displaced from its steady-state position relaxes with a velocity not proportional to the gradient of the logarithm of the steady-state probability.
Keywords
Cite
@article{arxiv.0907.0469,
title = {Nonequilibrium noise in electrophoresis: the microion wind},
author = {Suropriya Saha and Sriram Ramaswamy},
journal= {arXiv preprint arXiv:0907.0469},
year = {2009}
}
Comments
4 pages, PRL format, 4 figures