New antiferroelectric liquid crystal for use in LCD |
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| Authors: | A. Dłubacz D. Dardas M. Żurowska |
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| Affiliation: | 1. Institute of Physics, Jagiellonian University, Kraków, Poland;2. Institute of Molecular Physics, Polish Academy of Science, Poznan, Poland;3. Institute of Chemistry, Military University of Technology, Warsaw, Poland |
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| Abstract: | In this work, the physical properties of newly synthesized liquid crystalline compound exhibiting two liquid crystalline phases (ferroelectric and antiferroelectric) were studied. Based on the results of differential scanning calorimetry, polarizing microscopy, and photoelastic modulator methods, the temperature dependences of spontaneous polarization, tilt angle, switching time, and birefringence in the ferroelectric, as well as antiferroelectric phases were determined. Furthermore, the influence of the external electric field on the liquid crystalline textures was studied and the phase sequences at heating and cooling were revealed. The temperature dependence of spontaneous polarization was analysed by means of Landau mean-field theory, and the critical parameter β obtained for ferroelectric liquid crystalline and isotropic liquid transition was 0.21 which is close to 0.25, the value characteristic for tri-critical point. |
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| Keywords: | antiferroelectric and ferroelectric liquid crystals spontaneous polarization tilt angle switching time birefringence photoelastic modulator |
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