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High-resolution calorimetric study of the phase transitions of tridecylcyanobiphenyl and tetradecylcyanobiphenyl liquid crystals |
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| Authors: | G Cordoyiannis LFV Pinto MH Godinho C Glorieux |
| Institution: | 1. Laboratorium voor Akoestiek en Thermische Fysica, Departement Natuurkunde en Sterrenkunde , Katholieke Universiteit Leuven , Celestijnenlaan 200D, 3001 Leuven, Belgium;2. Department Ciéncia dos Materials and CENIMAT/13N , Universidade Nova de Lisboa , 2829-516 Caparica, Portugal |
| Abstract: | A thermal study of the liquid crystals tridecylcyanobiphenyl and tetradecylcyanobiphenyl has been performed by means of adiabatic scanning calorimetry. Both compounds exhibit only the smectic-A mesophase between the normal liquid and the crystalline phase and their phase transitions are strongly first order. A summary of the enthalpies and transition temperatures for all the smectic homologues of the cyanobiphenyl family is given, based on high-resolution measurements of the present work and previous studies. |
| Keywords: | adiabatic scanning calorimetry 13CB 14CB specific heat capacity enthalpy |