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

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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
Publication statusPublished - 01-12-2001


All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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