Fri, 25 Jul 2008 08:58:34 BST CiteULike: dchens Wegdam http://www.citeulike.org/user/dchen/author/Wegdam CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dchen/article/2811049 <i>Physical Review Letters, Vol. 100, No. 18. (2008)</i><br /><br />We report fluid-fluid and fluid-solid phase transitions of charge-stabilized polystyrene particles suspended in a binary liquid mixture of 3-methylpyridine and water. These thermally reversible phase transitions occur in the homogeneous phase of the binary liquid mixture below the coexistence temperature of the two liquids. Close density matching of the particles and the solvent allows us to follow the phase behavior until complete coexistence of macroscopic phases with temperature as the control parameter. We use small angle x-ray scattering to characterize these phases as colloidal gas, liquid, fcc crystal, and glass. Reversible Phase Transition of Colloids in a Binary Liquid Solvent Hua Guo Theyencheri Narayanan Michael Sztuchi Peter Schall Gerard Wegdam doi:10.1103/PhysRevLett.100.188303 Physical Review Letters, Vol. 100, No. 18. (2008) 2008-05-18T19:08:24-00:00 2008 Physical Review Letters 100 18 APS 2008 binary charge colloids phase system 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