Fri, 25 Jul 2008 04:37:19 BST CiteULike: dchens Schmidt http://www.citeulike.org/user/dchen/author/Schmidt CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dchen/article/1988262 <i>Physical Review Letters, Vol. 98, No. 10. (2007)</i><br /><br />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. Fluctuation-Dissipation Theorem in an Aging Colloidal Glass Sara Farouji Daisuke Mizuno Maryam Atakhorrami Fred Mackintosh Christoph Schmidt Erika Eiser Gerard Wegdam Daniel Bonn doi:10.1103/PhysRevLett.98.108302 Physical Review Letters, Vol. 98, No. 10. (2007) 2007-11-26T20:20:36-00:00 2007 Physical Review Letters 98 10 APS 2007 aging colloids experiment glass theory http://www.citeulike.org/user/dchen/article/2553149 <i>Physical Review Letters, Vol. 98, No. 18. (2007)</i><br /><br />We investigate sedimentation of model hard-sphere-like colloidal dispersions confined in horizontal capillaries using laser scanning confocal microscopy, dynamical density functional theory, and Brownian dynamics computer simulations. For homogenized initial states we obtain quantitative agreement of the results from the respective approaches for the time evolution of the one-body density distribution and the osmotic pressure on the walls. We demonstrate that single-particle information can be obtained experimentally in systems that were initialized further out of equilibrium such that complex lateral patterns form. Nonequilibrium Sedimentation of Colloids on the Particle Scale Patrick Royall Joachim Dzubiella Matthias Schmidt Alfons van Blaaderen doi:10.1103/PhysRevLett.98.188304 Physical Review Letters, Vol. 98, No. 18. (2007) 2008-03-18T23:05:10-00:00 2007 Physical Review Letters 98 18 APS 2007 colloids gravity system