Light-scattering performance compared

The observation of crossover has later been substantiated by several other studies. In particular, Jacob et al. [165] performed light scattering measurements on the system 3-MP + water + NaBr. The data indicate comparatively sharp crossover in the range 10-4 salt concentration. It is intriguing to characterize this crossover by a suitably defined crossover temperature Tx, defined here by the point of inflection in the T-dependence of the effective exponent yeff. Figure 8 shows fx as a function of the amount of added NaBr. Eventually, plain mean-field behavior is obtained in a solution containing about 16.8 mass% NaBr. 

We have performed optically heterodyne-detected optical Kerr effect measurement for transparent liquids with ultrashort light pulses. In addition, the depolarized low-frequency light scattering measurement has been performed by means of a double monochromator and a high-resolution Sandercock-type tandem Fabry-Perot interferometer. The frequency response functions obtained from the both data have been directly compared. They agree perfectly for a wide frequency range. This result is the first experimental evidence for the equivalence between the time- and frequency-domain measurements. 

Stabilization and destabilization studies on kaolin suspensions were performed in our group by means of various electrokinetic methods to follow the adsorption process of differently charged polyelectrolytes. The polyelectrolytes used were polycations such as the branched free polybase polyethyl-eneimine (PEI) and the linear PD ADM AC, and Na-poly aery late as polyanion, whereas the polycations are of different charge density. In Figures 4-7 results of electrophoretic light scattering experiments (Zetasizer 4, Malvern) of 0.05% (w/w) kaolin suspensions are presented (compare Ref. 24). 

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