Phase Behavior of the n-Decanoic Acid + Thallium(I) n-Decanoate System

The temperature and enthalpy vs composition diagrams of the binary system [(1 − x) n-C9H21CO2H + (x) n-C9H21CO2Tl, where x = mole fraction] were determined by means of differential scanning calorimetry, differential thermal analysis, and optical microscopy. Besides the usual regions of phase separat...

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Bibliographic Details
Published in:Langmuir 2000-06, Vol.16 (13), p.5825-5830
Main Authors: Cheda, J. A. Rodríguez, Fernández-García, M, Ungarelli, P, Ferloni, P, Fernández-Martín, F
Format: Article
Language:English
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Summary:The temperature and enthalpy vs composition diagrams of the binary system [(1 − x) n-C9H21CO2H + (x) n-C9H21CO2Tl, where x = mole fraction] were determined by means of differential scanning calorimetry, differential thermal analysis, and optical microscopy. Besides the usual regions of phase separation, miscibility was observed in isotropic liquid, liquid crystalline, and solid phases. This binary system displays the formation of:  (1) a 1:1 molecular compound which melts incongruently at T = 322.2 ± 0.1 K, Δfus H m = 50.7 ± 0.5 kJ·mol-1; (2) an eutectic at x = 0.125 and T = 302.0 ± 0.1 K, Δfus H m = 28.3 ± 0.3 kJ·mol-1; (3) a smectic A lyotropic mesophase occurring at T = 373.5 ± 0.1 K over the composition range x > 0.770; (4) a solid solution phase occurring over the composition x > 0.913, and 315.3 K < T < 404.2 K.
ISSN:0743-7463
1520-5827
DOI:10.1021/la9904511