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Influence of hydrogen bonding on phase abundance in ferroelectric liquid crystals |
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| Authors: | B Sridevi P V Chalapathi M Srinivasulu V G K M Pisipati D M Potukuchi Corresponding author |
| Institution: | 1. Department of Physics, Jawaharlal Nehru Technological University , College of Engineering , Kakinada-533003, India;2. Department of Chemistry , Manipal Academy of Higher Education , Manipal-576119, India;3. Centre for Liquid Crystal Research and Education, Faculty of Physical Sciences , Nagarjuna University , Nagarjuna Nagar-522510, India |
| Abstract: | The synthesis and characterization of five hydrogen-bonded ferroelectric liquid crystal complexes (HBFLCs) prepared from mesogenic p-n-alkoxy benzoic acids and non-mesogenic propionic/butyric acids with different chiral centres are reported. Complementary intermolecular hydrogen bonding is confirmed through IR study. HBFLCs are found to exhibit chiral nematic (N*), smectic C* (SmC*) and smectic G* (monotropic) phases in their cooling profiles during polarizing thermal microscopy and differential scanning calorimetry. Phase coexistence regions are observed above the IN* transition. The chiral nematic to smectic C* transition is found to be of first order. The temperature variation of spontaneous polarization exhibited by these HBFLC complexes in their SmC* phase is presented. The effect of non-covalent interaction imparted by the soft hydrogen bonding in these LC complexes on enhanced or induced thermal stability of tilted LC phases is discussed. |
| Keywords: | liquid crystal display colour tracking fringe-field switching dielectric anisotropy |