J. Physique Lett. 46, 445-450 (1985)
DOI: 10.1051/jphyslet:019850046010044500
Experimental studies on a triply reentrant mesogen
R. Shashidhar, B.R. Ratna, V. Surendranath, V.N. Raja, S. Krishna Prasad et C. NagabhushanRaman Research Institute, Bangalore 560080, India
Abstract
We present here the results of our detailed optical, X-ray, high pressure and dielectric studies on 4-nonyloxyphenyl-4'-nitrobenzoyloxybenzoate (DB90NO 2), a triply reentrant compound which exhibits the following sequence of transitions at atmospheric pressure on cooling the isotropic phase : I-N-A d-Nre-Ad(re)-Nre-A 1-C-A2-C2. The existence of the A2 phase, not reported so far in this compound, is clearly shown from our studies.
Résumé
Nous présentons les résultats d'études optiques, aux rayons X, diélectrique et haute pression sur le 4-nonyloxyphényl-4'-nitrobenzoyloxybenzoate (DB90NO 2), composé réentrant triple qui présente la séquence suivante de transitions en refroidissant à partir de la phase isotrope à pression atmosphérique : I-N-Ad-Nre-Ad(re)-N re-A1-C-A2-C2. Ces études révèlent bien l'existence de la phase A2 non mentionnée jusqu'ici dans ce composé.
6130E - Experimental determinations of smectic, nematic, cholesteric, and lyotropic structures.
6470M - Transitions in liquid crystals.
7720 - Dielectric permittivity.
Key words
dielectric properties of liquids and solutions -- high pressure phenomena and effects -- liquid crystal phase transformations -- nematic liquid crystals -- organic compounds -- permittivity -- smectic liquid crystals -- X ray diffraction examination of liquids -- isotropic nematic transitions -- nematic smectic transitions -- smectic A smectic C transition -- high pressure studies -- X ray studies -- optical studies -- dielectric constants -- triply reentrant mesogen -- 4 nonyloxyphenyl 4' nitrobenzoyloxybenzoate