Quantitative experimental determination of the Landau-potential of
chiral enantiomer doped ferroelectric liquid crystals |
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Authors: | P?Archer Email author" target="_blank">I?DierkingEmail author |
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Institution: | (1) School of Physics and Astronomy, University of Manchester, Schuster Laboratory, Oxford Road, Manchester, M13 9PL, UK |
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Abstract: | The full Landau potential was determined for a
ferroelectric liquid crystal doped with varying concentrations of the chiral dopant R1011 and its enantiomer S1011. A multi-curve
fitting procedure using temperature and electric field dependent tilt angle and polarization data was employed to the generalized
Landau model of ferroelectric liquid
crystals. From this analysis the three Landau coefficients as well as the polarization-tilt coupling parameters were obtained
as a function of dopant concentration and configuration. It is shown that the two most varied
parameters are those of the first Landau coefficient α and the
(chiral) linear polarization-tilt coupling constant C. The effect on the
first Landau term is equivalent for the two dopants of opposite handedness
indicating its achiral nature, while the effect on the (chiral) bilinear
coupling term differs for the R1011 and S1011 dopant, increasing and
decreasing the coupling between tilt and polarization respectively. This
difference in the bilinear coupling term quantifiably evidences that the
R1011 dopant increases and S1011 dopant reduces the inherent chirality in
this system. |
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Keywords: | |
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