CRITICAL FLUCTUATIONS IN ELECTROLYTES WITH A LIQUID-LIQUID PHASE-TRANSITION

Near-critical fluctuations of ionic solutions with a liquid-liquid pha se transition are investigated by measurements of turbidity and static and dynamic light scattering. Phase diagrams are also presented. The systems are substituted ammonium salts (picrate, nitrate, iodide) diss olved in higher alcohols and water. The correlation lengths, determine d from the time correlation functions using the Kawasaki mode coupling theory, also describe the temperature dependence of scattering intens ity and turbidity. Depending on the specific properties of the system mean-field or Ising behaviour is observed.