Aging of the Nonlinear Optical Susceptibility of colloidal solutions

Details Aging of the Nonlinear Optical Susceptibility of colloidal solutions Aging of the Nonlinear Optical Susceptibility of colloidal solutions

2006-09-26

arxiv.org/abs/cond-mat/0609659v1

Phys. Rev. B 75, 224203 (2007)

Physics

Condensed Matter

Soft Condensed Matter

4 figures, 4 pages

Scientific paper

10.1088/0953-8984/19/20/205129

Using Z-scan and dynamic light scattering measurements we investigate the nonlinear optics response of a colloidal solution undergoing dynamics slowing down with age. We study the high optical nonlinearity of an organic dye (Rhodamine B) dispersed in a water-clay (Laponite) solution, at different clay concentrations (2.0 wt% - 2.6 wt%), experiencing the gelation process. We determine the clay platelets self diffusion coefficient and, by its comparison with the structural relaxation time, we conclude that the gelation process proceeds through the structuring of interconnecting clay platelets network rather than through clusters growth and aggregation.

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