Phase Transition and Pre Transitional Studies across Isotropic - Smectic-F and G Phases in N-(P-n-a1koxybenzylidene)p-n-tetradecyl Anilines, (n0.14): A Dilatometry Study

Jitendra, Nadh M and Rao, Rama C G and Srinivasulu, M and Potukuchi, D M and Pisipati, V G K M (2001) Phase Transition and Pre Transitional Studies across Isotropic - Smectic-F and G Phases in N-(P-n-a1koxybenzylidene)p-n-tetradecyl Anilines, (n0.14): A Dilatometry Study. Molecular Crystals and Liquid Crystals, 366. pp. 457-471. ISSN 1563-5287

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Official URL: http://dx.doi.org/10.1080/10587250108023987

Abstract

The higher homologues of N-(p-n-alkoxy benzylidene) p-n-alkylanilines, (n0.m) viz., N-(p-n-alkoxybenzy1idene)p-n-tetradecylaniline, no. 14 compounds with n=10 to 16 exhibit a direct smectic-F phase from cooling the isotropic liquid, while the compound with n=18 shows a direct smectic-G phase from isotropic liquid. Density studies are carried out across isotropic-smectic-F, isotropic-smectic-G and smectic-F-smectic-G phases. The density jumps and thermal expansion coefficient maxima across these phases infer a first order IF or FG transition. The strength of pre-transitional effects studied through aefacross sotropic to nematic (IN), isotropic to smectic-A (IA) and isotropic to smectic-C (IC) phases. The a,, and the fluction dominated non linear region (FDNLR) values for T>T, obtained for these compounds underlines the increase of orientational disorder extended deep into the isotropic liquid for the formation of either smectic-F or smectic-G phase than in the case of the lower homologues exhibiting IN and IA phase transitions.

Item Type: Article
Uncontrolled Keywords: n0.14; Iso. - Smectic F; density jump; Thermal expansion coefficient maxima; Phase Transition studies; re-transitional effects
Subjects: Engineering > MIT Manipal > Chemistry
Depositing User: MIT Library
Date Deposited: 27 Jan 2015 06:16
Last Modified: 27 Jan 2015 06:16
URI: http://eprints.manipal.edu/id/eprint/141714

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