Smectic A-Cholesteric liquid crystal phase transition: A density study

E.L. Duarte, A.J. Palangana, R. Itri, A.R. Sampaio and A.A. Barbosa

The European Physical Journal B: Condensed Matter and Complex Systems, 1998, vol. 5, issue 4, 835-838

Abstract: The present work is focused on density measurements near the smectic A-cholesteric liquid crystal phase transition for cholesteryl myristate (C 14 ), cholesteryl nonanoate (C 9 ) and binary mixtures of C 14 and C 9 and cholesteryl caproate (C 6 ) and C 9 . The results have evidenced that the transition crosses over from first to second order when both the mean molecular length and the reduced temperature, r (ratio between the smectic A-cholesteric and cholesteric-isotropic phase transition temperatures), decrease in the system. The occurrence of a second order phase transition is observed for a concentration very near 63.1 molar percent of C 9 in the C 6 −C 9 mixture at r≅ 0.92. Copyright EDP Sciences, Springer-Verlag 1998

Keywords: PACS. 61.30.Eb Experimental determinations of smectic; nematic; cholesteric; and other structures - 64.70.Md Transitions in liquid crystals (search for similar items in EconPapers)
Date: 1998
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DOI: 10.1007/s100510050509

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