Dynamical Lightscattering of Pretransitional Phenomena in Liquid Mixtures

Abstract

We report measurements of the scattering intensity and of the autocorrelation function of the pseudo binary mixture guaiacol/glycerol‐water as a function of temperature and water content. The guaiacol glycerol ratio was kept constant 1:1, while the mass ratio of water/glycerol varied between 0.4% < x < 1.4%. The system shows a closed solubility loop if x > 1.17%. A phenomenological model for the temperature dependence of the interaction parameter is used in order to describe the scattering intensity and the diffusion coefficient as function of temperature.

Lower Critical Solution Temperature in the Metastable Region of an Ionic Solution in a Non-Polar Solvent

“…In the field of critical phenomena, closed solubility loops have been of interest because the size of the loops can be changed by changing the pressure or by adding a third component. , In the limit, when the UCST and the LCST coincide the critical points become a double critical point, and the values of the critical indices are doubled. , Quite generally, closed solubility loops can be obtained in mean field theories, for example, in the regular solution theory by allowing a temperature dependence of the interaction parameter. Beyond that, decorated lattice models have been developed to model the criticality demonstrating that such systems also belong to the Ising universality class .…”