2008/04/30 by Sara Jabbari‐Farouji, S. Jabbari-Farouji, Hajime Tanaka +2 · 7 citations
Chemistry · Materials Science · Physics and Astronomy · #Chemical physics #Chemistry #Condensed matter physics #Electrostatics and Colloid Interactions #Material Dynamics and Properties #Materials science #Phase (matter) #Phase diagram #Physics #Spectroscopy and Quantum Chemical Studies #Statistical physics #Thermodynamics #Viscoelasticity #Viscosity #cond-mat.soft #cond-mat.stat-mech
paper · pdf · doi:10.1103/physreve.78.061405
published as Phys. Rev. E 78, 061405 (2008). · 17 pages, 9 figures
arxiv created 2008/10/13 · openalex publication_date 2008/12/23 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.