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Proceedings Paper

In-plane bidimensional stripes in thin films of CCH-PCH mixtures: possible nucleation of a tilted smectic phase
Author(s): Sergei A. Pikin; Sofia I. Torgova; Alfredo Strigazzi
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Paper Abstract

Spontaneous in-plane bidimensional stripes are predicted to appear in thin films of tilted smectic liquid crystals, due to flexopolarization, provided the flexoelectric coefficients are great enough, as in several smectic C's. The two periodicities arise in orthogonal directions. In the presence of free ions, the charge distributions becomes also modulated in-plane, partially masking the direct flexopolarization influence. Both effective periods are of the order of 10 micrometers . The optical observations were performed on mixtures of trans-4-(trans-4'-n- amylcyclohexyl) cyclohexanecarboxylic acid (CCH) and of 4-(trans-4'-n-amylcyclohexyl) benzoic acid (PCH). Both pure compounds exhibit only a nematic phase, the first between 224 degree(s)C and 243 degree(s)C, and the second one between 180 degree(s)C and 265 degree(s)C. The experimental data are consistent with the present model, suggesting that, for certain CCH/PCH ratios less than 30%, a tilted smectic phase is nucleated close to the melting point.

Paper Details

Date Published: 19 January 1996
PDF: 13 pages
Proc. SPIE 2731, International Liquid Crystal Workshop on Surface Phenomena, (19 January 1996);
Show Author Affiliations
Sergei A. Pikin, Institute of Crystallography (Russia)
Sofia I. Torgova, Organic Intermediates and Dyes Institute (Russia)
Alfredo Strigazzi, Politecnico di Torino (Italy)

Published in SPIE Proceedings Vol. 2731:
International Liquid Crystal Workshop on Surface Phenomena
Evgenij Rumtsev; Maxim Georg Tomilin, Editor(s)

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