Induction and Enhancement of Ferroelectric Smectic C* Phase in Multi-Component Room Temperature Mixtures
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概要
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Six multi-component room-temperature ferroelectric liquid crystal (FLC) mixtures have been formulated and investigated using optical polarizing microscopy, dielectric spectroscopy as well as electro-optic methods. In all the mixtures smectic C* phase is either induced or enhanced. Effect of various dopants on the occurrence and thermal stability of different phases has been discussed. Spontaneous polarizations, measured as a function of temperature by reversal current method, are found to vary between 13–62 nC/cm2 at room temperature in all the mixtures. Different types of dielectric absorption behavior were observed in planar geometry of the FLC cells. Critical frequencies of Goldstone and soft modes have been determined by frequency dependent dielectric study. Rigidity of the core structure, nature of chirality and extent of fluorination of the constituent molecules are found to have pronounced effect on the collective mode relaxation behavior of the mixtures.
- 2009-01-25
著者
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Haase Wolfgang
Institut Fur Physikalische Chemie Technische Hochschule Darmstadt
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Mandal Pradip
Department of Physics, University of North Bengal, Siliguri-734013, India
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Haldar Sripada
Department of Physics, University of North Bengal, Siliguri-734013, India
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Lapanik Artsiom
Institute of Physical Chemistry, Darmstadt University of Technology, Darmstadt 64287, Germany
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Haase Wolfgang
Institute of Physical Chemistry, Darmstadt University of Technology, Darmstadt 64287, Germany
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