Observation of a re-entrant isotropic phase in a pure disc-like liquid crystal |
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| Authors: | T. Warmerdam D. Frenkel R. J. J. Zijlstra |
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| Affiliation: | 1. Fysisch Laboratorium Rijksuniversiteit Utrecht , P.O. Box 80.000, 3508 TA, Utrecht, The Netherlands;2. FOM Institute for Atomic and Molecular Physics , P.O. Box 41.883, 1009 DB, Amsterdam, The Netherlands |
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| Abstract: | Abstract We report the observation of an optically isotropic phase in the new disc-like mesogen 2,3,7,8,12,13-hexa(octadecanoyloxy)truxene. On cooling, this optically isotropic phase goes over into a nematic phase, while on heating a columnar phase grows in. To our knowledge this is the first example of a pure discotic mesogen exhibiting an isotropic phase below the temperature existence of a columnar phase. Our findings are supported by refractive index measurements of this compound as a function of temperature. |
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