Physical Chemistry Phase Separation in Liquid Mixtures with Miscibility Gap on D-2. B. Braun, Ch.
Special focus is on the impact of thermocapillary droplet migration on the phase separation process.
The experiment starts with a quasi-isothermal phase transition, i.e. with thermocapillary droplet motion absent. This is accomplished by employing the pressure jump technique which is based on the pressure dependence of the miscibility gap. The sample is first heated up. Crossing the lower phase separation temperature entails a steep rise of the turbidity. This signal is measured by a special turbidity sensor and is used to trigger an electromagnetic valve for pressurization of the sample.