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Molecular Crystals and Liquid Crystals Volume 449, 2006 - Issue 1
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Original Articles

Investigation of the Smectic-A–Smectic-C* Transition in Liquid Crystals by Adiabatic Scanning Calorimetry

K. Denolf Laboratorium voor Akoestiek en Thermische Fysica Departement Natuurkunde en Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan, Leuven, BelgiumCorrespondence[email protected]
,
B. Van Roie Laboratorium voor Akoestiek en Thermische Fysica Departement Natuurkunde en Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan, Leuven, Belgium
,
G. Pitsi Laboratorium voor Akoestiek en Thermische Fysica Departement Natuurkunde en Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan, Leuven, Belgium
&
J. Thoen Laboratorium voor Akoestiek en Thermische Fysica Departement Natuurkunde en Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan, Leuven, Belgium
Pages 47-55 | Published online: 31 Aug 2006
 
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Abstract

We performed Adiabatic Scanning Calorimetry (ASC) measurements on two ferroelectric liquid crystals: S-(-)-4-(2′ -methylbutyloxy)phenyl 4-n-octyloxybenzoate and S-(-)-2-methylbutyl 4-n-nonanoyloxybiphenyl-4′-carboxylate. Our experiments showed that no latent heat was present for the smectic-A – smectic-C* (AC*) transition to within the experimental resolution. Therefore the AC* transition in both samples can be classified as a continuous one. By fitting the specific heat data we showed that this phase transition can be described by an extended mean-field model.

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