Title

Calorimetric and X-ray Diffraction Studies of Critical Behavior at the Nematic to Lamellar Phase Transition

Publication Title

Korea Polymer Journal

Publication Date

10-1998

Document Type

Article

Disciplines

Physics

Abstract

The nematic (N) to lamellar (Lα) phase transition in binary mixtures of cesium perfluorooctanoate (CSPFO) and water has been studied by high-precision calorimetry and high-resolution synchrotron x-ray scattering. The artio of the heat capacity amplitudes, above and below the NLα transition, and the corresponding critical exponent α on seven CSPFO concentrations remain near 1 and 0, respectively, suggesting that the transition is a second order in agreement with 3-d XY type behavior. The longitudinal correlation lengthII and the susceptibility associated with the lamellar phase fluctuations in the N phase at the concentration 46.6 wt% CSPFO were measured over three decades of reduced temperature and found to diverge with critical exponent , respectively.

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