Effective temperatures from the fluctuation-dissipation measurements in soft glassy materials

S. Jabbari-Farouji, D. Mizuno, D. Derks, G.H. Wegdam, F.C. MacKintosh, C.F. Schmidt, D. Bonn

Research output: Contribution to journalArticleAcademicpeer-review

19 Citations (Scopus)

Abstract

We have investigated the validity of the fluctuation-dissipation theorem (FDT) and the applicability of the concept of effective temperature in a number of non-equilibrium soft glassy materials. Using a combination of passive and active microrheology to measure displacement fluctuations and the mechanical response function of probe particles embedded in the materials, we have directly tested the validity of the FDT. Our results show no violation of the FDT over several decades in frequency (1–104 Hz) for hard-sphere colloidal glasses and colloidal glasses and gels of Laponite. We further extended the bandwidth of our measurements to lower frequencies (down to 0.1 Hz) using video microscopy to measure the displacement fluctuations, again without finding any deviations from the FDT.
Original languageEnglish
Article number20006
Pages (from-to)20006-1/6
Number of pages6
JournalEPL
Volume84
Issue number2
DOIs
Publication statusPublished - 2008

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