More on phase diagram of Laponite
Abstract
The phase diagram of a charged colloidal system (Laponite) has been investigated by dynamic light scattering in a previously unexplored range of salt and clay concentrations. Specifically the clay weight and salt molar concentrations have been varied in the ranges Cw=0.004- 0.025, Cs=(1x 10^-3- 5x 10^-3) M respectively. As in the case of free salt water samples (Cs= 1x 10^-4 M) an aging dynamics towards two different arrested phases is found in the whole examined Cw and Cs range. Moreover a transition between these two different regimes is found for each investigated salt concentration. It is clear from these measurements that a revision of the phase diagram is necessary and a new "transition" line between two different arrested states is drawn.
Cite
@article{arxiv.cond-mat/0509235,
title = {More on phase diagram of Laponite},
author = {B. Ruzicka and L. Zulian and G. Ruocco},
journal= {arXiv preprint arXiv:cond-mat/0509235},
year = {2007}
}
Comments
16 pages, 5 figures, submitted to Langmuir