Nature of the smectic-A -smectic-C transition of a partially perfluorinated compound

T. Stoebe, L. Reed, M. Veum, C. C. Huang

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19 Scopus citations

Abstract

The smectic-A-smectic-C phase transition of one partially perfluorinated liquid-crystal compound has been investigated by performing detailed calorimetric studies of both bulk samples and free-standing films. The heat-capacity data from thin free-standing films demonstrate the importance of fluctuations due to reduced dimensionality. Moreover, the data from bulk samples and thick films cannot be adequately described by the customary extended mean-field model. Discussions of other fitting schemes are presented. The free-standing film and bulk data are most consistent with a functional form based on the extended mean-field model but including Gaussian fluctuations. Moreover, the inclusion of Gaussian fluctuation terms adequately accounts for the observed film thickness dependence of smectic-A-smectic-C heat-capacity anomaly exhibited by this partially perfluorinated compound.

Original languageEnglish (US)
Pages (from-to)1584-1591
Number of pages8
JournalPhysical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume54
Issue number2
StatePublished - Dec 1 1996

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