More on phase diagram of Laponite

Details More on phase diagram of Laponite More on phase diagram of Laponite

2005-09-09

arxiv.org/abs/cond-mat/0509235v1

Physics

Condensed Matter

Soft Condensed Matter

16 pages, 5 figures, submitted to Langmuir

Scientific paper

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.

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