title: Fluctuation-dissipation theorem in an aging colloidal glass.
abstract: 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.
authors.affiliation: Van der Waals-Zeeman Institute, University of Amsterdam, 1018XE Amsterdam, the Netherlands.
authors.forename: Sara
authors.initials: S
authors.lastname: Jabbari-Farouji
authors.forename: Daisuke
authors.initials: D
authors.lastname: Mizuno
authors.forename: Maryam
authors.initials: M
authors.lastname: Atakhorrami
authors.forename: Fred C
authors.initials: FC
authors.lastname: MacKintosh
authors.forename: Christoph F
authors.initials: CF
authors.lastname: Schmidt
authors.forename: Erika
authors.initials: E
authors.lastname: Eiser
authors.forename: Gerard H
authors.initials: GH
authors.lastname: Wegdam
authors.forename: Daniel
authors.initials: D
authors.lastname: Bonn
mesh_terms: D000465:Algorithms; D003102:Colloids / Q000737:chemistry*; D004548:Elasticity; D012212:Rheology / Q000706:statistics & numerical data*; D013535:Suspensions; D013997:Time Factors; D014783:Viscosity; D014867:Water
chemical_list: D003102:Colloids; D013535:Suspensions; D014867:Water