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HRTEM, TSC and broadband dielectric spectroscopy of a discotic liquid crystal

Dantras, Eric and Dandurand, Jany and Lacabanne, Colette and Laffont-Dantras, Lydia and Tarascon, Jean-Marie and Archambeau, Samuel and Seguy, Isabelle and Destruel, Pierre and Bock, Harald and Fouet, Sonia HRTEM, TSC and broadband dielectric spectroscopy of a discotic liquid crystal. (2004) Physical Chemistry Chemical Physics, 6 (16). 4167-4173. ISSN 1463-9076

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Official URL: http://dx.doi.org/10.1039/b402063d

Abstract

Due to its molecular configuration, Pyrene 1,3,6,8-tetracarboxylic rac-2-ethyl hexyl ester exhibits a mesomorphic phase at room temperature. High resolution transmission electron microscopy (HRTEM) of samples with various thermal history yield important results on discotic liquid crystal nanostructure. The evolution of the molecular organisation with the temperature has been determined by differential scanning calorimetry (DSC). The physical structure of this columnar liquid crystal is shown by dynamic dielectric spectroscopy (DDS) along a broad temperature and frequency range. As this liquid crystal is used as film electronic devices, the thermostimulated micro-technique (m-TSC) has been improved and developed. The behavior and molecular mobility in this columnar liquid crystal are studied. The correlation with thermal studies allows us to understand dielectric properties as a function of physical state.

Item Type:Article
HAL Id:hal-01221290
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université de Picardie Jules Verne (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:27 Oct 2015 15:32

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