Multiple nonergodic disordered states in Laponite suspensions : a phase diagram

S. Jabbari-Farouji, H. Tanaka, G.H. Wegdam, D. Bonn

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Abstract

We study the time evolution of different Laponite suspensions from a low-viscosity ergodic state to a viscoelastic nonergodic state over a wide range of volume fractions and salt contents. We find that the evolution of nonergodicity parameter (Debye-Waller factor) splits into two branches for all the samples, which correspond to two distinct dynamically arrested states. At moderately high salt concentrations, on the other hand, a third nonergodic state appears that is different from the above two nonergodic states. Measurement of the conductivity of Laponite solutions in pure water shows that the contribution of counterions in the ionic strength is considerable and their role should be taken into account in interpretations of aging dynamics and the phase diagram. Based on these data and available data in the literature, we propose a (nonequilibrium) phase diagram for Laponite suspensions.
Original languageEnglish
Article number061405
Pages (from-to)061405-1/10
Number of pages10
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume78
Issue number6
DOIs
Publication statusPublished - 2008

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