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Title: Evidence from adiabatic scanning calorimetry for the Halperin-Lubensky-Ma effect at the N-SmA phase transitions in mixtures of 7OCB+heptane with an injected SmA phase
Authors: Tripathi, C. S. P ×
Losada-Perez, P
Leys, J
Cordoyiannis, G
Glorieux, Christ
Thoen, Jan #
Issue Date: Jul-2012
Publisher: Springer
Series Title: European Physical Journal E, Soft Matter vol:35 issue:7
Article number: ARTN 54
Abstract: The high-resolution adiabatic scanning calorimetric technique has been used to investigate the
nematic-smectic A transition (N-SmA) in binary mixtures of the non-smectogenic liquid crystal heptyloxycyanobiphenyl
(7OCB) and heptane, exhibiting a so-called injected smectic A phase. With the exception
of a mixture with the lowest heptane mole fraction for which only an upper limit of 0.2 ± 0.2Jkg−1 for
a possible latent heat could be obtained, for all other mixtures finite latent heats were obtained. The
mole fraction dependence of the latent heat could be well fitted with a crossover function consistent with
a mean-field free energy expression with a non-zero cubic term arising from the Halperin-Lubensky-Ma
(HLM) coupling between the SmA order parameter and the orientational director fluctuations. The mole
fraction dependence of the heat capacity effective critical exponents is similar to that observed in mixtures
of the two liquid crystals octyloxycyanobiphenyl (8OCB) and nonylcyanobiphenyl (9OCB). The thermal
behavior observed along the N-SmA phase transition line yields further strong evidence for the HLM
coupling effect.
ISSN: 1292-8941
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Soft Matter and Biophysics
× corresponding author
# (joint) last author

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