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Phys. Rev. Lett. 98, 108302 (2007) [4 pages]

Fluctuation-Dissipation Theorem in an Aging Colloidal Glass

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Sara Jabbari-Farouji1, Daisuke Mizuno2, Maryam Atakhorrami2, Fred C. MacKintosh2, Christoph F. Schmidt2,*, Erika Eiser3, Gerard H. Wegdam1, and Daniel Bonn1,4
1Van der Waals-Zeeman Institute, University of Amsterdam, 1018XE Amsterdam, the Netherlands
2Department of Physics and Astronomy, Vrije Universiteit Amsterdam, 1081HV Amsterdam, The Netherlands
3van’t Hoff Institute for Molecular Sciences, University of Amsterdam, 1018WV Amsterdam, The Netherlands
4Laboratoire de Physique Statistique, de l’ENS, Normale Supérieure, 75231 Paris Cedex 05, France

Received 15 November 2005; published 9 March 2007

We provide a direct experimental test 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 nonequilibrium 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.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.108302
DOI:
10.1103/PhysRevLett.98.108302
PACS:
82.70.Gg, 61.43.Fs

*Present address: III. Physikalisches Institut, Fakultät für Physik, Georg-August-Universität, 37077 Göttingen, Germany.

 
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