Fluctuation-dissipation theorem in an aging colloidal glass
Soft Condensed Matter
2009-11-11 v2 Statistical Mechanics
Abstract
We provide a direct experimental test of the Stokes-Einstein relation as a special case of the fluctuation-dissipation theorem (FDT) in an aging colloidal glass. The use of combined active and passive microrheology allows us to independently measure both the correlation and response functions in this non-equilibrium situation. Contrary to previous reports, we find no deviations from the FDT over several decades in frequency (1 Hz-10 kHz) and for all aging times. In addition, we find two distinct viscoelastic contributions in the aging glass, including a nearly elastic response at low frequencies that grows during aging. This is the clearest change in material properties of the system with aging.
Cite
@article{arxiv.cond-mat/0511311,
title = {Fluctuation-dissipation theorem in an aging colloidal glass},
author = {Sara Jabbari-Farouji and Daisuke Mizuno and Maryam Atakhorrami and Fred C. MacKintosh and Christoph F. Schmidt and Erika Eiser and Gerard H. Wegdam and Daniel Bonn},
journal= {arXiv preprint arXiv:cond-mat/0511311},
year = {2009}
}
Comments
5 pages,4 figures