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The heat capacity of the doubly reentrant mesogen: 4-cyanobenzoyloxy-4′-octylbenzoyloxy-p-phenylene |
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| Authors: | Gerald R Van Hecke Michio Sorai |
| Institution: | 1. Microcalorimetry Research Center, Faculty of Science , Osaka University , Toyonaka, Osaka, 560, Japan;2. Department of Chemistry , Harvey Mudd College , Claremont, California, 91711, U.S.A.;3. Microcalorimetry Research Center, Faculty of Science , Osaka University , Toyonaka, Osaka, 560, Japan |
| Abstract: | Abstract Heat capacity of a 20 g sample of the mesogen 4-cyanobenzoyloxy-4′-octylbenzoyloxy-p-phenylene was measured in the temperature range 380 to 510 K by adiabatic calorimetry. The C p versus T data is interpreted in terms of thermodynamically equivalent SA1 and SAd phases whose Gibbs potential surface intersects the thermodynamically equivalent reentrant nematic and nematic Gibbs potential surface in such a way as to define the first order doubly reentrant phase sequence: SA1-N-SAd-N. The data do not allow any precise estimates of transition enthalpies. |
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