Title: Accelerated dielectric relaxation in the isotropic phase of associating liquid crystals dispersed with aerosils
Authors: Leys, Jan ×
Glorieux, Christ
Thoen, Jan #
Issue Date: 2008
Publisher: Published by the American Physical Society through the American Institute of Physics
Series Title: Physical Review E, Statistical, nonlinear, and soft matter physics vol:77 issue:6 pages:1-6
Article number: 061707
Abstract: The dielectric response of liquid crystals in their nematic phase shows an acceleration of the relaxation
associated with the rotation around the short molecular axis when dispersed with aerosils. However, in the
isotropic phase, this acceleration is only seen for certain liquid crystalline molecules. In this paper, an associating
liquid crystal 5CB and a shorter monotropic liquid crystalline member of the same homologous series
4CB, a liquid crystal that does not show association 5NCS and a nonassociating liquid crystal 5¯O5 have
been studied by dielectric spectroscopy in the isotropic phase. Both 4CB and 5CB show a constant acceleration
in the isotropic phase, observed over a broad temperature range. 5NCS and 5¯O5 do not show an acceleration
in their isotropic phase. It seems that the disturbance of the dipole-dipole association process for the associating
molecules is an important factor in the explanation of the acceleration of the relaxation in the isotropic phase.
ISSN: 1539-3755
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Soft Matter and Biophysics
× corresponding author
# (joint) last author

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