Phase transition and pre transitional studies across isotropic - Smectic-F and G phases in N-(P-n-alkoxybenzylidene)p-n-tetradecyl anilines, (nO.14)

A dilatometry study

M. Jitendra Nadh, C. G. Rama Rao, M. Srinivasulu, D. M. Potukuchi, Venkata G.K.M. Pisipati

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The higher homologues of N-(p-n-alkoxy benzylidene) p-n-alkylanilines, (nO.m) viz., N-(p-n-alkoxybenzylidene)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 α effacross isotropic to nematic (IN), isotropic to smectic-A (IA) and isotropic to smectic-C (IC) phases. The α eff and the fluction dominated non linear region (FDNLR) values for T>T c 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.

Original languageEnglish
Pages (from-to)457-471
Number of pages15
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume366
Publication statusPublished - 01-12-2001

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Aniline Compounds
dilatometry
Aniline
aniline
Phase transitions
Liquids
liquids
Thermal expansion
thermal expansion
disorders
Cooling
cooling
expansion
coefficients

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

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title = "Phase transition and pre transitional studies across isotropic - Smectic-F and G phases in N-(P-n-alkoxybenzylidene)p-n-tetradecyl anilines, (nO.14): A dilatometry study",
abstract = "The higher homologues of N-(p-n-alkoxy benzylidene) p-n-alkylanilines, (nO.m) viz., N-(p-n-alkoxybenzylidene)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 α effacross isotropic to nematic (IN), isotropic to smectic-A (IA) and isotropic to smectic-C (IC) phases. The α eff and the fluction dominated non linear region (FDNLR) values for T>T c 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.",
author = "{Jitendra Nadh}, M. and {Rama Rao}, {C. G.} and M. Srinivasulu and Potukuchi, {D. M.} and Pisipati, {Venkata G.K.M.}",
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TY - JOUR

T1 - Phase transition and pre transitional studies across isotropic - Smectic-F and G phases in N-(P-n-alkoxybenzylidene)p-n-tetradecyl anilines, (nO.14)

T2 - A dilatometry study

AU - Jitendra Nadh, M.

AU - Rama Rao, C. G.

AU - Srinivasulu, M.

AU - Potukuchi, D. M.

AU - Pisipati, Venkata G.K.M.

PY - 2001/12/1

Y1 - 2001/12/1

N2 - The higher homologues of N-(p-n-alkoxy benzylidene) p-n-alkylanilines, (nO.m) viz., N-(p-n-alkoxybenzylidene)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 α effacross isotropic to nematic (IN), isotropic to smectic-A (IA) and isotropic to smectic-C (IC) phases. The α eff and the fluction dominated non linear region (FDNLR) values for T>T c 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.

AB - The higher homologues of N-(p-n-alkoxy benzylidene) p-n-alkylanilines, (nO.m) viz., N-(p-n-alkoxybenzylidene)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 α effacross isotropic to nematic (IN), isotropic to smectic-A (IA) and isotropic to smectic-C (IC) phases. The α eff and the fluction dominated non linear region (FDNLR) values for T>T c 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.

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