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Weak Forces for the Growth of Smectic-F Liquid Crystal

Potukuchi, D M and Rani, Padmaja G and Srinivasulu, M and Pisipati, V G K M (1998) Weak Forces for the Growth of Smectic-F Liquid Crystal. Molecular Crystals and Liquid Crystals, 319. pp. 19-29. ISSN 1563-5287

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Abstract

N(p-n-dodecyloxybenzy1idene)p-n-alkylanilines, viz., 120.m compounds of n0.m series, for m = 4, 5, 6, 8, 10, 12, 14 and 16 are synthesised and characterised by Polarised Thermal Microscopy (TM) and Differential Scanning Calorimetry (DSC). These compounds are found to exhibit 2D Bond-Orientationally (BO) ordered smectic-F liquid crystal phase with shift distortion along with orthogonal smectic-A, -B(cryst) phases. The intermediate members of the compounds of 120.m series (m < 10) are found to exhibit orthogonal smectic phases along with the tilted phases, while the higher homologues (m > 10) show the tilted bond-orientational smectic phases only. The miscibility studies for the confirmation of smectic-F phase through binary (120.12 + 100.14) phase diagram, suggests the possibility for the occurrence of smectic-F phase down towards ambient temperatures. The smectic-G phase melting temperature, TFG is found to depress at lower and higher concentrations (x), while smectic- F phase clearing temperature TIFre mains constant with the concentration. The thermal span of smectic-F phase is found to depend on the chemical potential (represented by the mole fraction x) in the (T, x) phase diagram. The cubic fit in the vicinity of lower/higher concentrations, qualitatively infers the weak nature of Van der Walls’ molecular forces for the growth of pseudo-hexagonal packed quasi-2-D BO ordered S, liquid crystal with a poor registry of positional correlations.

Item Type: Article
Uncontrolled Keywords: 120.m compounds of nO.m series; smectic-F; miscibility studies; phase diagram; Van der Walls’ forces
Subjects: Engineering > MIT Manipal > Chemistry
Depositing User: MIT Library
Date Deposited: 27 Jan 2015 06:34
Last Modified: 27 Jan 2015 06:34
URI: http://eprints.manipal.edu/id/eprint/141717

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