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

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      Publication Details (including relevant citation   information):

      “Lower Critical Solution Temperature in the Metastable Region of   an Ionic Solution in a Non-Polar Solvent”, H. R. Dittmar, W. H.   Schröer, J. Phys. Chem. B 113, 1249 (2009)

      Abstract:

       

      Previous studies of the critical behavior of ionic solutions in   non-polar solvents showed mainly upper critical solution   temperatures. Now, we report for the solution of tetra-n-butyl   ammonium bromide (N4444Br) in toluene a nearly closed   miscibility loop, where the lower critical solution temperature   (Tc= 297.75 ±0.05 K, xc= 0.0270   ±5·10-4) is located in the region, which is metastable   in respect to crystallization of the salt. The new observation is   in variance to the former findings according which the phase   separation of ionic solutions in non-polar solvents is similar to   that of the model of charged hard spheres in a dielectric   continuum, termed restricted primitive model (RPM), which has an   upper critical solution point.

       

      Address (URL): http://pubs.acs.org/doi/abs/10.1021/jp8103485