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<strong>Calorimetric and dielectric study of a negative dielectric anisotropy alkoxy-phenyl-benzoate liquid crystal</strong>

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Title Statement <strong>Calorimetric and dielectric study of a negative dielectric anisotropy alkoxy-phenyl-benzoate liquid crystal</strong>
 
Added Entry - Uncontrolled Name Kalakonda, Parvathalu ; Carnegie Mellon University
 
Uncontrolled Index Term Calorimetryp; Dielectric spectroscopy; Phase behaviour; Liquid crystal
 
Summary, etc. <strong>Modulated Differential Scanning Calorimetry (MDSC) and dielectric spectroscopy have been used to measure the complex specific heat and dielectric constant over a wide temperature range on heating and cooling for a negative dielectric anisotropy alkoxyphenylbenzoate liquid crystal, denoted 9OO4. The MDSC experimental parameters were varied in order to yield quasi-static specific heat results and the same base scan rate was used for the dielectric measurements. On cooling, 9OO4 exhibits a typical weakly first-order isotropic to nematic then a continuous nematic to smectic-<em>A</em> phase sequence followed by a monotropic smectic-<em>C</em> and smectic-<em>B</em> phases before crystallizing. The smectic-<em>B</em> conversion is very slow, even for our quasi-static scan parameters. On heating, the crystal phase super-heats and exhibits a strong first-order transition into an unknown smectic phase that itself converts to the smectic-<em>A</em> phase via a first-order, highly rate dependent, phase transition. The nematic-smectic-<em>A</em> transition has an unusual character given the molecular structure of 9OO4 that may be related to combination of molecular structure and a negative dielectric anisotropy.</strong>
 
Publication, Distribution, Etc. Indian Journal of Pure & Applied Physics (IJPAP)
2015-06-22 13:48:30
 
Electronic Location and Access application/pdf
http://op.niscair.res.in/index.php/IJPAP/article/view/5698
 
Data Source Entry Indian Journal of Pure & Applied Physics (IJPAP); ##issue.vol## 52, ##issue.no## 10 (2014): Indian Journal of Pure & Applied Physics
 
Language Note en
 
Nonspecific Relationship Entry http://op.niscair.res.in/index.php/IJPAP/article/download/5698/13633
 
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