Electro-optical Kerr effect in the isotropic phase of the two antiferroelectric liquid crystal mixtures |
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| Authors: | E. Vahedi H. Tajalli A. Ghanadzadeh Gilani J. Parka H. Nasirzadeh Milani |
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| Affiliation: | 1. Tabriz Branch, Islamic Azad University , Tabriz, Iran ein.vahedi@gmail.com;3. Faculty of Physics, Tabriz University , Tabriz, Iran;4. Research Institute for Applied Physics and Astronomy, Tabriz University , Tabriz, Iran;5. Research Institute for Applied Physics and Astronomy, Tabriz University , Tabriz, Iran;6. Faculty of Science, Department of Chemistry , University of Guilan , Rasht, Iran;7. Institute of Applied Physics, Military University of Technology , Warsaw 00-908, Poland;8. Research Institute for Applied Physics and Astronomy, Tabriz University , Tabriz, Iran |
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| Abstract: | We have experimentally studied for the first time the electro-optical Kerr effect and the pre-transitional behavior in the isotropic phase of two antiferroelectric liquid crystal mixtures, W-232 and W-204D, composed of rod-like ester molecules exhibiting the direct smectic-A to isotropic (SmA-I) phase transition. The Kerr law has been confirmed for the two compounds and the variation of inverse Kerr constant with temperature above the smectic–isotropic transition temperatures were determined. Both the mixtures with very broad antiferroelectric phase around room temperature have similar sequence of the phases (i.e., Cr-SmC*A-SmC*-SmA-I). Although, the pre-transitional behavior is usually complex in the isotropic phase of the chiral smectic liquid crystal compounds, the investigated compounds showed a similar behavior compared to that of nematic–isotropic behavior. |
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| Keywords: | antiferroelectric liquid crystals smectic A isotropic phase electro-optical Kerr effect pre-transition behavior |
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