On the Refractive Index of Ageing Dispersions of Laponite

Details On the Refractive Index of Ageing Dispersions of Laponite On the Refractive Index of Ageing Dispersions of Laponite

2008-01-10

arxiv.org/abs/0801.1575v1

Physics

Condensed Matter

Soft Condensed Matter

13 pages, 3 figures, to appear in Applied Clay Science

Scientific paper

10.1016/j.clay.2007.12.010

Aqueous dispersion of Laponite at low ionic concentration is of interest since it undergoes structural evolution with respect to time, which is usually termed as ageing. In this work we study the refractive index behavior as a function of ageing time, concentration and temperature. We observed that the extended Lorenz-Lorentz equation fitted the refractive index dependence on concentration and temperature very well. The refractive index did not show any dependence on ageing time. However, the dependence of refractive index on concentration showed a marked change as the system underwent transition from an isotropic to a biphasic state. The slope of the refractive index-density data is remarkably close to that of water at all Laponite concentrations. In the context of transport phenomena, optical measurements such as interferometry can exploit the water-like behavior of Laponite dispersions.

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